Abstract
Landslide occurrence has become increasingly influenced by human activities. Accordingly, changing land use and land cover (LULC) is an important conditioning factor in landslide susceptibility models. We present a bibliometric analysis and review of how LULC was explored in the context of landslide susceptibility in 536 scientific articles from 2001 to 2020. The pattern of publications and citations reveals that most articles hardly focus on the relationship between LULC and landslides despite a growing interest in this topic. Most research outputs came from Asian countries (some of which are frequently affected by landslides), and mostly with prominent international collaboration. We recognised three major research themes regarding the characteristics of LULC data, different simulated scenarios of LULC changes, and the role of future scenarios for both LULC and landslide susceptibility. The most frequently studied LULC classes included roads, soils (in the broadest sense), and forests, often to approximate the negative impacts of expanding infrastructure, deforestation, or major land use changes involving agricultural practice. We highlight several articles concerned primarily with current practice and future scenarios of changing land use in the context of landslides. The relevance of LULC in landslide susceptibility analysis is growing slowly, though with much potential to be explored for future LULC scenario analysis and to close gaps in many study areas.
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Introduction
Landslides are natural and potentially hazardous phenomena that move rock, debris, or earth downslope under the influence of gravity (Cruden and Varnes 1996). Landslides arise from interactions between slope geometry, soil and rock properties, as well as surface and groundwater dynamics (Bogaard and Greco 2016). These preconditioning characteristics influence weathering processes and may contribute to a decrease in shear strength (Skilodimou et al. 2018). This decrease, combined with triggering factors such as precipitation, earthquakes, snow melt, or human activities, can lead to potentially destructive landslides (Petley 2012; Haque et al. 2019). For example, Froude and Petley (2018) reported that 4862 landslides caused 55,997 fatalities between 2004 and 2016. Nevertheless, the impact of landslides on society remains underestimated because much of the damage attributed to earthquakes and storms is tied instead to resulting landslides (Varnes 1984; Aleotti and Chowdhury 1999). In this context, landslide susceptibility analysis has become essential for disaster risk reduction, aiming to prevent damages and casualties (Bragagnolo et al. 2020).
Landslide susceptibility maps identify terrain locations likely to be most prone to slope failure by analysing the characteristics of reported landslides (Guzzetti et al. 2005). For this purpose, it is necessary to identify the factors influencing landslide occurrence. Numerous studies have explored the influence of geology (Henriques et al. 2015; Kim and Song 2015), rainfall (Guzzetti et al. 2007; Zêzere et al. 2015), and geomorphometric characteristics (Vorpahl et al. 2012; Nugraha et al. 2015) in this respect. For example, Reichenbach et al. (2018) identified as many as 596 different conditioning factors used in 565 articles published between 1983 and 2016; geomorphometric variables made up 37% of all these conditioning factors, followed by those linked to land cover (18%).
Land cover refers to the biological and physical materials on the Earth’s surface (Herold et al. 2006). It comprises natural elements, such as water bodies, forests, exposed rock or soil, and surfaces modified by humans, such as roads, buildings, and agriculture. In contrast, land use alludes to the socio-economic appropriation of the land (Herold et al. 2006), i.e., the purpose humans give to the terrain, to safeguard occupation or production. Land cover impacts soil mechanical behaviour and moisture in many ways. For example, vegetation may protect soil from erosion and improve slope stability through mechanical anchoring and soil suction by roots (Löbmann et al. 2020; Parra et al. 2021; Masi et al. 2021). On the contrary, deforestation, road construction, slope cutting, or building construction on hillslopes often reduce slope stability (Chen et al. 2019).
Therefore, land use and land cover (LULC) are important conditioning factors that influence rainfall-triggered landslides (Glade 2003), and many studies have argued that land use/cover changes (LUCC) might increase landslide susceptibility (Chen and Huang 2013). For example, Lehmann et al. (2019) explored the relationship between deforestation and landslide occurrence by looking at root reinforcement in four distinct climatic environments with different forest management practices. Since deforested lands had negligible root strength, the authors simulated forest alteration scenarios in which areas without forest regrowth showed higher landslide occurrence and impacts. Similarly, Mugagga et al. (2012) reported a spatial relationship between landslide occurrence and slopes deforested for cultivation. Apart from areas where crops have replaced forests, abandoned cultivated lands may also be highly susceptible to landslides (Galve et al. 2015; Persichillo et al. 2017). Like deforestation, most construction works compromise slope stability (Karsli et al. 2009; Meneses et al. 2019) by altering infiltration, surface runoff, and groundwater flows (Vuillez et al. 2018). Furthermore, excavation and blasting commonly used for construction may change the natural stress state and force equilibrium in a given hillslope (Liu et al. 2021).
Many studies argued that LUCC might alter landslide susceptibility (Chen and Huang 2013; Liu et al. 2021). In this sense, Pisano et al. (2017) analysed the influence of LUCC on landslide susceptibility through future scenarios. One of the future scenarios considered past trends, with increases in forest and cultivated areas, and another presented a decrease in forest area and agricultural activity. The authors concluded that reducing forest areas and abandoning farming lands might increase the erosional processes. Promper et al. (2014) analysed LUCC over 138 years in Austria to simulate the evolution of landslide risk. The authors considered two main future trends; the first adopted the LULC trends previously verified in the region, and the second took into account no newly built areas. The result was that the expansion of housing construction was predicted in landslide susceptibility areas. Both studies showed that LULC scenarios might aid landslide susceptibility studies for reducing disaster risk.
While an increasing number of studies have been considering LULC in landslide susceptibility (Quevedo et al. 2021) or inventory analysis (Uehara et al. 2022), most review articles separately focus on LULC (Montalván-Burbano et al. 2021), landslide susceptibility modelling (Budimir et al. 2015; Huang and Zhao 2018; Pourghasemi et al. 2018; Reichenbach et al. 2018; Merghadi et al. 2020; König et al. 2022; Lima et al. 2022), landslide classification system (Hungr et al. 2014; Li and Mo 2019), and landslide study area (Dikshit et al. 2020; Dias et al. 2021; Valdés Carrera et al. 2021). Here, we offer a systematic review of how landslide susceptibility studies include the multi-faceted aspects of LULC and bibliometric analysis of the use of LULC data in landslide susceptibility. Finally, we discuss major research themes, focusing on which and how LULC types were parameterised to arrive at a possible ranking.
Materials and methods
Research on natural hazards has seen an increasing number of bibliometric studies analysing the scientific output on landslides (Wu et al. 2015; Briones-Bitar et al. 2020; Carrión-Mero et al. 2021). However, none of the studies explored the use of LULC in susceptibility analyses. Below, we outline our database search criteria; filtering criteria; data pre-processing; bibliometric analysis; and strategies for reviewing (Fig. 1).
Search criteria, filters, and database
This study considered the Web of Science™ (WoS), since it is the oldest scholarly database (Birkle et al. 2020), maintained by Clarivate Analytics™, with more than 74.8 million records and 1.5 billion references in 254 subject disciplines (Singh et al. 2021). Furthermore, we follow the choice of many previous bibliometric studies of landslides (Gokceoglu and Sezer 2009; Reichenbach et al. 2018; Merghadi et al. 2020; Dias et al. 2021). We focused on search terms that express LULC to capture the effect of human activities on landslide susceptibility (Meneses et al. 2019; Knevels et al. 2020) and LUCC. We considered all fields (topic option) and applied the search argument: ((“landslide susceptibility” OR “mass movement susceptibility”) AND (“land cover” OR “land use” OR “land use cover change” OR “LULC” OR “LUCC”)). This first selection, carried out in July 2021, resulted in 1071 articles.
The search was limited to peer-reviewed articles and excluded books, book chapters, conference proceedings, and reports, as well as “grey literature”, theses, and dissertations (Reichenbach et al. 2018). All articles post-dating 2020 were also excluded from this collection, resulting in 814 articles. Next, we checked whether the remaining papers included mention of landslide susceptibility, as many articles focused on other natural hazards, such as soil erosion, gully occurrence, and soil subsidence, though with cursory reference to landslides. Nearly a fifth of the papers was irrelevant to the analysis, leaving us with 645 articles.
All abstracts were screened to ensure that the analysis considered only articles that used LULC as a conditioning factor in the susceptibility analysis. Where abstracts did not clearly indicate whether the article was suitable, the entire publication was screened. For example, some papers mentioned that landslide susceptibility might support land use planning but disclosed little about how LULC may affect landslide susceptibility instead. Hence, we manually removed articles focused on landslide inventory or susceptibility modelling without LULC as a conditioning factor, resulting in 536 articles in our final database.
Bibliometric analysis and review
The bibliometric analysis was conducted in three stages: (i) assessment of productivity and impact, based on publication and citation counts; (ii) network map** to visualise collaborations among authors and countries; and (iii) most frequent keywords and research areas to portray major research themes.
The first stage explored trends in scientific output, considering publications, citations, cited references in each article, and the focus of the most cited papers. Next, we analysed co-authorship using bibliometric maps of collaboration networks generated through VOSviewer software (van Eck and Waltman 2010). Subsequently, the publication counts were mapped according to countries and study areas to depict the geographical focus of the studies, to explore which countries have been most studied at which scale, and to check whether the most studied countries also suffered major landslide disasters in the past.
The most frequent keywords approximate the personal and collective choice of technical jargon, the structure consistency (Herrera-Franco et al. 2021), and trends in the subject areas (Leung et al. 2017). The most frequent keywords in the abstracts and the most common authors’ keywords were computed using the R programming language and VOSviewer software, respectively. For the abstract analysis, a cleaning step was performed to remove stop words and the terms used to select the articles (i.e., landslide, landslide susceptibility, mass movement susceptibility, land cover, land use, land use cover change, LULC, LUCC). Then, only stem words were considered to avoid over-presenting slight variations of the same term in the word cloud, e.g., map, maps, or map**. Finally, we analysed the authors’ keywords with a co-occurrence network map (van Eck and Waltman 2010) to identify prominent grou**s.
Lastly, we highlighted articles that specifically explored the relationship between LULC and landslide susceptibility, following the more traditional line of literature review. While the massively rising publication numbers in the general field of landslide research may encourage, if not even partly justify, the use of bibliometric exploration, we see this as an addition to, rather than a replacement of, conventional literature reviews. Therefore, we selected articles that contained terms related to LULC in their titles, such as land use and land cover. This selection allowed us to thoroughly explore the contribution of these specific articles and highlight trends in the use of LULC in landslide studies.
Results
Publication trends
Among all the 536 articles, 533 were written in English, and the other three were in Korean, Malay, and Portuguese. The database comprises articles published between 2001 and 2020, divided into four equal intervals: (i) 2001 – 2005; (ii) 2006 – 2010; (iii) 2011 – 2015; and (iv) 2016 – 2020. In these phases, the annual average number of publications grew nearly 15-fold between the first and the last phase (Fig. 2).
Phase I had the highest proportion of individual publications (19%) and the least international collaboration (24%), with most articles addressing landslide susceptibility with statistical models, such as discriminant function (Dai and Lee 2001) and logistic regression (Lee and Min 2001; Baeza and Corominas 2001). These papers analysed LULC according to landslide occurrence (Baeza and Corominas 2001). In phase II, articles began to focus on model comparison, with increasing use of artificial neural networks for susceptibility modelling (Merghadi et al. 2020) and some studies about the influence of LULC characteristics on landslide susceptibility (Yesilnacar and Süzen 2006). In phase III, models such as logistic regression and frequency ratio remained popular, with several studies recognising the effects of LULC on landslide susceptibility (Reichenbach et al. 2014). Finally, phase IV amassed the highest fraction of publications concerned with the relationship between LULC and landslide susceptibility.
The rapid increase in publication numbers since 2012 reached a peak in 2019 when 80 articles were published. This peak may be partly related to the International Consortium on Landslides (ICL) strategies to understand and reduce landslide disaster risk (Sassa 2015). In 2012, for example, the 10th Anniversary Conference of ICL created a strategic plan for the period between 2012 and 2022 (Sassa 2012). Additional boosts for this rapid rise in research output are the substantial increase in freely available satellite imagery and topographic and LULC data (Wulder and Coops 2014; Jun et al. 2014; Gómez et al. 2016).
The number of references per article has also increased. The average reference list has roughly tripled in length over the past two decades, being the shortest in 2002, with 25 references per article, and surpassing 80 references per article in 2020. This increase in the number of current publications and references per article improves the probability of a published article being cited at least once. For example, the total number of citations per year increased considerably in 2016, reaching a maximum of 5860 citations in 2020 (Fig. 2). This increase in citations may be related to the “Sendai Partnerships 2015–2025 for global promotion of understanding and reducing landslide disaster risk”, which was adopted for 33 countries aiming to improve landslide research (Sassa 2015).
Articles published in 2012 were the most cited: eight of the 39 papers received more than 150 citations each. The main contributions of these eight articles concerned the comparison of model performance, using an average of ten conditioning factors, focusing on study areas in Iran, Vietnam, Malaysia, and South Korea. In some of these studies, LULC was the second (Pourghasemi et al. 2012a, b) or the third (Tien Bui et al. 2012; Mohammady et al. 2012) most important landslide conditioning factor. Some authors found that settlements or residential land were mainly located in susceptible areas (Pourghasemi et al. 2012b; Althuwaynee et al. 2012), while many authors pointed out the higher susceptibility close to roads (Tien Bui et al. 2012; Althuwaynee et al. 2012; Mohammady et al. 2012).
The 15 most-cited articles represented 3% of all analysed papers and concentrated 18% of all citations between 2001 and 2017, most of them published during phases I (33%) and III (33%). These papers featured landslide susceptibility models based on two to four different algorithms. For example, the most cited article (Lee and Min 2001) exemplified how to model susceptibility with logistic regression and analysed the relationship between conditioning factors and landslide occurrence. In addition, the Annual Citation Index (ACI) represents the average citation according to the article publication year. Most articles (79%) received between one and 20 citations per year, while only 1% received more than 60 citations per year on average (Fig. 3). Among the 15 most cited articles, the paper with the highest ACI (Chen et al. 2016; Moulds et al. 2018; Zhang et al. 2019; Ghorbanian et al. 2020). However, not all studied regions were represented by authors in these countries, which means that not necessarily the most studied and affected areas are the most contributing. For example, there are studies about Afghanistan, Colombia, Costa Rica, Ecuador, and El Salvador, carried out by researchers whose affiliation is associated with countries such as China and Nepal, the Czech Republic, USA, Germany and Canada, and Spain, respectively.
Keywords and research areas
The most common term in the abstracts of all 536 articles was “map” (Fig. 7), which appeared more than 1700 times, describing the characteristic research product of landslide susceptibility studies. Other common words were “factor”, “slope”, and the stem form of distance (“distanc”). About two dozen terms were related to landslide conditioning factors and eight to LULC. Among the 15 most used LULC keywords, “road” was the top ranking, followed by “soil” and “forest” (Fig. 8). References to the proximity of roads appeared mainly as a landslide conditioning factor, while only two abstracts informed about the presence of roads in unstable areas. Rawat and Joshi (2012) and Sujatha et al. (2012), for example, highlighted, respectively, that up to 9% of the roads in the Igo river basin, and intense anthropogenic activities, such as busy roads, in Tevankarai Ar sub-watershed, both in India, were located in high landslide susceptible areas. Other common, though similarly generic, LULC terms such as “settlement” or “agriculture” remain comparably scarce in the publication record.
Regarding keywords provided by the authors, a total of 542 different entries were identified and corrected for minor inconsistencies. We focused on those 50 keywords that appeared at least five times: “landslide susceptibility” occurred in 45% of all articles, followed by “GIS” (Geographic Information System) (43%), “landslide” (35%), and “frequency ratio” (15%). The keywords “land use” and “land cover” appeared only in seven and five articles, respectively. The authors’ keywords were analysed with a co-occurrence network map, considering seven words as the minimum cluster size (Fig. 9). All four clusters have keywords related mainly to algorithms used for landslide susceptibility modelling, underscoring the strong methodological focus in this field, and many less frequently mentioned keywords refer to specific statistical methods. The central core of the network has three nodes (relevant topics) with similar importance and many connections among the clusters.
The research covered 27 subject areas, reflecting the interdisciplinary nature of landslide and LULC studies. The most frequent research areas (Fig. 10) were Geology (30%), followed by Water Resources (15%), and Environmental Sciences and Ecology (14%). Despite the predominance of areas focused on science, technology, engineering, and mathematics (STEM), few of them are also related to social analysis and public management, i.e., fields closely studying LULC from various perspectives. Furthermore, the analysed articles were published in 128 different journals, of which the top 15 most frequent journals covered 57% of all publications and 74% of all citations. The greatest number of articles was published in the “Environmental Earth Sciences” journal. On the other hand, considering the citations, the highlighted journal was “Environmental Geology”, which presented the highest average citation by article. According to the database, the journal that showed the longest activity was “Natural Hazards”, with publications between 2004 and 2020, followed by “Landslides” and the “International Journal of Remote Sensing”, both since 2005. Both research areas and journals may confirm the pattern of interdisciplinarity shown by the keyword analysis.
Landslide susceptibility focused on LULC
Most of the studied papers sought better models for landslide susceptibility analysis. Some identified LULC as one of the most influential landslide conditioning factors for susceptibility modelling. For example, Arabameri and Rezaei (2019) found that LULC, NDVI, and distance to road were the most important landslide conditioning factors in the Sangtarashan watershed, Iran. All these factors are related to LULC. Similarly, LULC was the most important factor in the susceptibility modelling in the Sarkhoun catchment, Iran (Shirani et al. 2018), and in Mezam Division, Cameroon (Afungang et al. 2017). The former study highlighted that poor rangeland, agriculture, and rock outcrops were the most related to landslide susceptibility; the latter pointed out that predicted landslides are concentrated in a hilly area with an expanding urban population. Austin et al. (2013) analysed the effects of the Three Gorges Dam on local urban areas and landslide susceptibility in Yichang City, China. With the flooding of the reservoir area, numerous settlements were moved to higher-elevation areas. In this sense, the authors assessed the landslide occurrence likelihood in these new urban areas, concluding that the new constructions are below steep slopes, which could lead to high susceptibility. The influence of LULC on landslide susceptibility was also explored by Galve et al. (2015) in Cinque Terre, Italy. The authors generated scenarios by changing LULC classes, i.e., they used maps with abandoned lands and simulated scenarios in which vineyards, forests, or structural measurements replaced the abandonment. They found that vineyards may slightly reduce landslide susceptibility; on the other hand, forests might be more effective in reducing susceptibility. With a focus on vegetation class, Miller (2013) proposed to use the Surface Cover Index in landslide susceptibility analysis in Dominical, Costa Rica. This index represents vegetation vigour and degradation and improved the model performance when incorporated into the landslide susceptibility analysis. While these studies focused on model performance improvement or urban land cover changes and landslide susceptibility, they hardly explored why LULC was the most important factor for a given study area or how it could alter susceptibility.
Indeed, few publications explored the influences of LULC in detail. Yesilnacar and Süzen (2006) pioneered LULC map**, considering multispectral satellite images, vegetation indices, topographic indices, and transformation components (principal component analysis). In studying the Asarsuyu basin, Turkey, the authors showed that including multiple indices and principal component analysis improved the overall classification accuracy while estimating the influence of LULC classes using the logistic regression algorithm. Although the logistic regression overall accuracy rose by only 2%, the landslide locations estimation improved by up to 20%. Moreover, young forests (forests removed by fires or deforestation and regrown after the 1980s) and a moist mixed group (rocks, grassland, and agriculture) were the most frequent LULC classes in landslide bodies and high susceptibility areas. Meneses et al. (2019) evaluated the influence of different LULC datasets on landslide susceptibility in the Zêzere watershed, Portugal, to identify road networks that could be more predisposed to future blockages caused by landslides. For that, the authors included the same predisposing factors in all models; the only change in modelling processes corresponded to variation in LULC spatial resolution. The study results demonstrated that more detailed LULC data improved the landslide susceptibility map**, though not necessarily their transferability to similar catchments elsewhere. The authors emphasised the lack of studies that compare LULC maps with different properties (scale and spatial resolution) since LULC is usually taken from pre-existing cadastres or mapped from satellite imagery. Both studies exemplify that including LULC data in landslide susceptibility analysis may provide more insights about LULC and landslides; however, the approaches remained static since they considered a single slice.
Given that human activities can modify vast areas quickly (Glade 2003), LULC may need more dynamic scenarios. For example, Chen et al. (2019) tracked LULC over 21 years (1992, 2002, and 2013) to quantify their relevance for landslides in Xuan’en County, China, an area marked by a substantial increase in anthropic activities such as clearing forests for grass and arable lands. The authors reported that these conversions compromised slope stability, though less so in recent years, commensurate with lower deforestation rates. The study suggested that including LUCC in landslide assessment and proper land use planning in urbanisation may decrease landslide susceptibility. A similar temporal analysis was also done by Persichillo et al. (2017), who studied landslide-prone terrain in rural areas, mainly agriculture fields and vineyards, in three different catchments in Altrepò Pavese, Italy. The study built on 58 years of data with five pre-existing LULC maps and found that LULC was one of the most important conditioning factors on slope stability, especially in abandoned lands. Maintaining cultivated areas seemed crucial to support land conservation and reduce shallow landslide activity. Similarly, Reichenbach et al. (2014) classified the LULC for 2 years (1954 and 2009) before and after reported landslides in the Briga catchment, Italy. The study contemplated various scenarios to explore the relationship between forest and landslide susceptibility and pointed to more stable slopes in 1954, likely because of the increase in forested areas. Comparing 1954 and 2009 through different land use scenarios, the authors demonstrated an increase in landslide susceptibility with decreasing forest areas and expanding patches of bare soil. The scenarios of reforestation resulted in more stable slopes in the model. This study used only DEM-derived variables and LULC classification, offering high reproducibility.
The relationship between forest and landslide susceptibility was also explored by Malek et al. (2015) for Buzau County, Romania. The authors studied past (1989, 2000, and 2010) and future scenarios (2040) for three LUCC classes: persistent forest, forest expansion, and deforestation. The study points out forest cover changes in different landslide susceptibility classes and how these modifications can be considered for risk management. For example, areas with higher susceptibility had more non-forest but were also more likely to expand forests in the future; hence, landslide susceptibility is prone to change accordingly. Shu et al. (2019) explored how LULC changed along with landslide susceptibility over 150 years (1946 – 2097) in the Val d’Aran region, Spain. Again, outcomes showed an increase in areas with low susceptibility and a decrease in high susceptibility zones, possibly related to the 163% increase in forest cover areas from 1946 to 2097 in one of the scenarios. The authors excluded other future impacts, such as climate changes or rainfall regimes. Finally, Pisano et al. (2017) considered past land cover (1954, 1981, and 2007) trends for simulating LULC scenarios for the Rivo basin, Italy, for 2030 and 2050. Then, more cultivated areas decreased landslide susceptibility, likely because cultivation replaced areas without prior maintenance, resulting in better land and water management practices. The authors argued that good management practices would lower landslide susceptibility in the future. Hence, simulating different LULC scenarios allows to identify how LUCC may alter landslide susceptibility, thus aiding decision makers in territorial planning for disaster risk reduction.
Discussion
Landslides are a widespread phenomenon that causes disasters around the world. In this sense, many researchers have been seeking the most influential landslide conditioning factors to improve landslide susceptibility map**. Some of these factors are physical, such as geology and geomorphometry; others are related to human activity (Skilodimou et al. 2018) that rapidly transforms the landscape (Guzzetti et al. 2005). In this sense, considering the impact of anthropic activities on slopes, researchers have increasingly been trying to relate LULC changes and slope instability (Karsli et al. 2009; Mugagga et al. 2012; Chen and Huang 2013; Austin et al. 2013). In the following, we discuss how the influence of LULC on landslide susceptibility modelling has been assessed.
Landslides and LULC studies
Landslides have been studied for a long time (Radbruch-Hall and Varnes 1976) due to their impacts on society (Haque et al. 2019). However, much landslide research became more structured as an independent discipline during and following the International Decade for Risk Reduction of the United Nations in 2000. In this process, the core study was defined, aiming to standardise and review terminologies (Sassa 2007) and further quantitative susceptibility assessment studies (Cruden 1997). This mission may partly explain the focus on model performance that most reviewed articles focused on. We recognise a trend from landslide susceptibility studies to a stronger focus on statistical (Dai and Lee 2001), deep learning (Pradhan and Lee 2010), machine learning (Tien Bui et al. 2012), and hybrid models (Shirzadi et al. 2017; Roy et al. 2019) in the past two decades.
Furthermore, LULC classifications have been done since the 1970s (Phiri and Morgenroth 2017) but have rapidly improved in coverage and resolution thanks to the increase in available satellite imagery (Wulder and Coops 2014; Gómez et al. 2016). He et al. (2022) highlighted that the LUCC research focused on modelling until 2004; between 2005 and 2013, eco-environmental impacts were emphasised, while the current phase focused on improving global sustainability. These different focuses on LULC and LUCC research are reflected broadly in our literature database. For example, there was an increasing trend in the number of publications on landslide susceptibility that used LULC data as a conditioning factor since about 2004, and more studies that explored LULC and LUCC impacts on hillslopes to assess landslide susceptibility (Persichillo et al. 2017).
The importance of considering LULC or LUCC on landslide assessment relies on the impacts of human activities on slopes, mainly agricultural and forestry activities, which are also affected by global warming and call for efficient management strategies to reduce landslide susceptibility (Gariano and Guzzetti 2016). However, considering that landslides will occur under the same conditions as past landslides might represent a limited vision, as hillslope conditions change drastically in response to human activities (Guzzetti et al. 2005). Hence, considering LULC’s future scenarios in landslide susceptibility analysis would provide more practical results to aid public administrators in long-term land use management and landslide disaster risk reduction.
LULC as a landslide conditioning factor
One confounding issue is that LULC encompasses various impacts on soil structure according to each cover class (Chen et al. 2019; Löbmann et al. 2020; Masi et al. 2021). For example, a developed forest presents more significant root reinforcement than undergrowth or cultivation areas (Lehmann et al. 2019). Also, changes in LULC likely modify soil shear strength, causing slope instability, and in some cases, rapid changes can become a landslide trigger (Davies 2015).
Our analysis found that the most common LULC classes were road, soil, and forest (Fig. 8), most likely because the relevant data are easy to obtain most objectively. Generally, roads enter susceptibility models regarding the distance from mapped landslides (Yan et al. 2019). Road construction and maintenance directly or indirectly impact the slope through slope cuts or changes in surface water runoff (Vuillez et al. 2018). Other road impacts include the construction of paths for forestry logging (Jaafari et al. 2015), which generally follow different regulations than those for official roads. “Soil” is also frequently reduced to patches of bare land or poorly vegetated ground instead of distinct soil types. Many studies reported that deforestation or logging exposes soil to erosion processes and slope instability (Reichenbach et al. 2014; Cohen and Schwarz 2017; Persichillo et al. 2017). Again, forests are commonly associated with an increase in slope stability (Cohen and Schwarz 2017). While many studies concur that deforestation raises landslide susceptibility (Dai et al. 2002), few mention the roles of forest type, structure, health, or natural disturbances (Parra et al. 2021).
Hence, while the different classes of LULC can be analysed separately, they are also often interconnected, which may compromise some statistical models in terms of collinearity. Furthermore, when analysing LUCC, not only will the change be a determining factor of landslide occurrences, but also the relative gains and losses for a given LULC class (Liu et al. 2021). For example, replacing forests for agriculture may promote more slope instability (Lehmann et al. 2019), whereas cultivating previously abandoned areas may decrease landslide susceptibility (Pisano et al. 2017). Scenario-based approaches to LUCC (Promper et al. 2014; Malek et al. 2015; Pisano et al. 2017; Shu et al. 2019) can guide future actions for reducing landslide disaster risk.
Countries’ contribution and landslide disasters
The pattern of countries with more publications in landslide research differs from other reviews (Carrión-Mero et al. 2021; Huang et al. 2022) because only articles that included LULC data in landslide susceptibility analysis were considered. Nonetheless, many studies agree that the countries with the most publications about landslides tend to be from Asia (Pourghasemi et al. 2018; Reichenbach et al. 2018). For example, South Korea has the highest number of researchers per million inhabitants (R/MI), whereas China and the USA have the highest total number of researchers (TR) (Table 1). On the other hand, Greece, Norway, and Austria had the lowest TR, probably because of their small populations.
While the susceptibility to landslides may be a strong incentive for landslide research, it is also the government investment in research and science (Habib et al. 2019). For example, India has the second-highest population in the world and presents low TR, possibly related to the low investment in research and development (R&D) (UNESCO Institute for Statistics 2021). Furthermore, some countries that suffered disasters, such as Afghanistan, Colombia, and Ecuador, hardly published, at least internationally (Fig. 6). For example, Colombia and Ecuador presented low investments in R&D (UNESCO Institute for Statistics 2021) and few researchers (there is no available data for Afghanistan). On the other hand, the authors’ affiliations that studied the aforementioned countries are related to China, the Czech Republic, Germany, and Canada, which corroborate the importance of investment in R&D to encourage more studies on the landslide topic.
Some of the most productive countries, in terms of publication numbers (Table 1), suffered from recent landslide disasters (Fig. 5). The landslide disaster occurrence may be related to the difficulty of establishing official regulations and strategies for landslide risk reduction due to budgetary constraints or cultural factors, among other causes (Winter and Bromhead 2012). For example, Mateos et al. (2020) indicated that even in Europe, there are no general regulations for landslide risk reduction, and not all European countries have official landslide guidelines for territorial planning or methodological guides.
Limitations and future trends
The selection of the scholarly database and the search keywords might add some limitations to this study. The focus on WoS may render a one-sided perspective. For example, Valdés Carrera et al. (2021) used multiple database platforms (WoS, Scopus, SciELO, REDIB, and Redalyc) of Latindex to analyse landslide studies in Latin America. Hence, the low number of studies from South America, Central America, and the Caribbean might be an artefact of the database choice.
Moreover, our analysis focused on articles that considered LULC as a conditioning factor in landslide susceptibility assessment; yet, LULC classes are diverse and multiple and sometimes non-exclusive. Then, limitations on the keywords used in the first search criteria might result in a limited articles database. As we considered only words directly related to LULC (land cover, land use, land use cover change, LULC, and LUCC) on the first search, it may result in not including relevant articles in our database (Guns and Vanacker 2013). For example, the road was not taken into account as a keyword in the first search, which generally appears as a specific conditioning factor (Jaafari et al. 2015), such as distance or proximity to roads (Brenning et al. 2015).
Some publications were excluded from the database because of keyword choices (e.g., landslide susceptibility vs. mass movement susceptibility). Preliminary searches did not include studies with terms such as “landslide occurrence” (Van Beek and Van Asch 2004; Wasowski et al. 2010; Promper et al. 2014; Cohen and Schwarz 2017; Gariano et al. 2018; Vuillez et al. 2018; Knevels et al. 2021), “debris flow” (Rogelis and Werner 2014; He et al. 2018), or “rockfall” (Lopez-Saez et al. 2016; Farvacque et al. 2019) or articles published after 2020 (Knevels et al. 2021; Rabby et al. 2022).
Furthermore, it is worth mentioning that the analysis of the influence of LULC on landslide susceptibility is a theme of expanding interest and interdisciplinary relevance and is still in need of studies. We identify several challenges for the future:
-
(i)
Bibliometric studies: executing a comprehensive search, including specific LULC classes and landslide occurrence, may provide a complete database. For example, including the LULC keywords “roads” and “forest” may provide specific articles which analyse the relationship between landslides and these land cover classes;
-
(ii)
Review articles: since reviews tend to be applied to a small number of papers, the limitation of the preliminary search to the article title may generate a more restricted database focused on LULC in landslide analysis;
-
(iii)
Research articles—modelling performance: there is an increasing interest in studies that apply hybrid models in landslide susceptibility analysis, which may focus more on LULC effects on landslide occurrence;
-
(iv)
Research articles—LULC influence: simulating LULC future scenarios and evaluating how it modifies the landslide susceptibility seems to be a potential hotspot in landslide topics. This map** is interesting to show for public managers which changes in LULC increase and which of them decrease the landslide susceptibility;
-
(v)
Research articles—other topics: the inclusion of possible climate change impacts; the consideration of variations in rainfall conditions; the root reinforcement according to different plant species and LULC classes.
Conclusions
This study explored the use of LULC data on landslide susceptibility assessment through bibliometric and review approaches. The literature database was composed of 536 articles, which revealed that most publications focused on landslide susceptibility modelling using LULC data as a conditioning factor. The lion’s share of scientific research was on model performance, varying from statistical and index-based models to deep learning and machine learning algorithms. In addition, we found that countries most affected by landslides were not necessarily the most productive in terms of international authorship quantities, likely reflecting national imparity in investment in research and development. Notably, South American and African nations seem strikingly absent from the international community of authors. Our analysis emphasises how LULC and LUCC influence on landslide susceptibility has become more common only gradually since 2016 onwards. The first approach focused on how LULC map** influences landslide susceptibility, especially classification method, scale, and spatial resolution. More recent works consider the simulation of future LULC scenarios and how this changed landslide susceptibility. The future landslide susceptibility scenarios may provide helpful information for landslide risk management and land use planning. In conclusion, the analysis of LULC influence on landslide susceptibility is an expanding theme, which has the potential to be explored for future scenario analysis and to close gaps in study areas.
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Acknowledgements
The authors are thankful to Dr. Evlyn Marcia Leão de Moraes Novo for the insights and motivation to carry out a review study.
Funding
This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior-Brazil (CAPES)-Finance Code 001. The APC was funded by ESPOL Polytechnic University.
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Conceptualisation, R.P.Q., A.V.M., and N.M.B.; methodology, N.M.B., F.M.C.; software, N.M.B., O.K.; validation, R.P.Q., A.V.M., N.M.B., and F.M.C.; formal analysis, A.V.M., N.M.B., and F.M.C.; investigation, R.P.Q.; resources, R.P.Q., A.V.M., N.M.B., and F.M.C.; data curation, R.P.Q., A.V.M., and N.M.B.; writing—original draft preparation, R.P.Q.; writing—review and editing, A.V.M., N.M.B., F.M.C., O.K., and C.D.R.; visualisation, R.P.Q. and A.V.M.; supervision, C.D.R.; project administration, R.P.Q.; funding acquisition, A.V.M. All authors have read and agreed to the published version of the manuscript.
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Pacheco Quevedo, R., Velastegui-Montoya, A., Montalván-Burbano, N. et al. Land use and land cover as a conditioning factor in landslide susceptibility: a literature review. Landslides 20, 967–982 (2023). https://doi.org/10.1007/s10346-022-02020-4
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DOI: https://doi.org/10.1007/s10346-022-02020-4