Abstract
The Ocoña River Valley, in the Arequipa Department in southern Peru, extends over 150 km from the Pacific coast to its headwaters in the Andes Mountains. While traditionally sparsely populated with farmers and crawfish fishermen, the valley has seen a large population growth in the last 20 years as small gold mines have developed. This change poses the opportunity to evaluate three research questions: How do geologic hazards and risks increase from mining activity? How does unplanned urban development affect risks? How do landforms restrict development and thereby increase risks? The combination of climate, topographic, and hydrologic conditions result in widespread hazards from debris flows, collapsible soils, erosion, rockfall, flooding, and liquefaction. We have developed maps of these hazards for three communities where mines have recently developed, Secocha, Alto Molino, and San Juan de Chorunga, and then we conducted a risk analysis for changing conditions, termed “Risk–Risk” analysis. Because of the lack of vegetation on mountain slopes, mining operations typically only affect rockfall hazards, mostly in the immediate vicinity of the mines and in the nearby runout zones. However, increased population and associated settlement infrastructure is constrained by steep slopes and regularly-flooded valleys, so residents live in fan and terrace areas with substantially increased risks from debris flows and collapsible soils and moderately increased risks from flooding and rockfall.
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References
Andrew, R. D. (1994) The colorado rockfall hazard rating system.
Beck HE, Zimmermann NE, McVicar TR, Vergopolan N, Berg A, Wood EF (2018) Present and future Köppen-Geiger climate classification maps at 1-km resolution. Sci Data 5(1):180214. https://doi.org/10.1038/sdata.2018.214
Bell FG, Donnelly LJ (2006) Mining and its Impact on the Environment. Min Impact Environ. https://doi.org/10.1201/9781482288230
CGS. (2008) Guidelines for evaluating and mitigating seismic hazards in California, Special Publication 117A. California Geological Survey.
Copons R, Vilaplana JM, Linares R (2009) Rockfall travel distance analysis by using empirical models (Solà d’Andorra la Vella, Central Pyrenees). Nat Hazard Earth Syst Sci 9(6):2107–2118. https://doi.org/10.5194/nhess-9-2107-2009
Dai FC, Lee CF, Ngai YY (2002) Landslide risk assessment and management: an overview. Eng Geol. https://doi.org/10.1016/S0013-7952(01)00093-X
Fanos AM, Pradhan B (2019) A novel hybrid machine learning-based model for rockfall source identification in presence of other landslide types using LiDAR and GIS. Earth Syst Environ. https://doi.org/10.1007/s41748-019-00114-z
Glade T, Anderson M, Crozier MJ (2012) Landslide hazard and risk. Landslide Hazard Risk. https://doi.org/10.1002/9780470012659
GRA-ARMA. (2018) Zonificación Ecológica y Económica de la Región de Arequipa. SIAR Arequipa. Mapas Geomorfológicos Arequipa. Retrieved from http://siar.regionarequipa.gob.pe/mapas/mapa-geologia-estructura
Jakob M, Holm K, Weatherly H, Liu S, Ripley N (2013) Debris flood risk assessment for Mosquito Creek, British Columbia Canada. Nat Hazard 65(3):1653–1681. https://doi.org/10.1007/s11069-012-0436-6
Keefer DK, Moseley ME, deFrance SD (2003) A 38 000-year record of floods and debris flows in the Ilo region of southern Peru and its relation to El Niño events and great earthquakes. Palaeogeogr, Palaeoclimatol, Palaeoecol 194(1):41–77. https://doi.org/10.1016/S0031-0182(03)00271-2
Laharie R (1985) Les aplanissements du sud du Perou premiere partie: surfaces, pediments, glacis. Bull Inst Fr Et and 14(1–2):19–47
Luis, R., & Salzmann, H. (2018, October 29) Rockfall Mitigation Measures in Open Pit Mines. Case Study Quarry Wall Stabilisation and Protection Works at Mandai .
Luque Poma, G., & Rosado Seminario, M. (2014) Zonas Críticas por Peligros Geológicos el la Región Arequipa.
Maerz NH, Youssef A, Fennessey TW (2005) New risk-consequence rockfall hazard rating system for Missouri highways using digital image analysis. Environ Eng Geosci. https://doi.org/10.2113/11.3.229
Malone A, Smith NM, Zeballos Zeballos E (2021) Coexistence and conflict between artisanal mining, fishing, and farming in a Peruvian boomtown. Geoforum 120:142–154. https://doi.org/10.1016/j.geoforum.2021.01.012
Palacios, O. et al. (1995) Geología del Peru. Bol. 55 - Serie A, Carta Geológica Nacional.
Palacios, O. et al. (2000) Memoria Explicativa del Mapa Geológico del Perú Escala 1:1 000 000. Bol. 136 - Serie A, Carta Geológica Nacional.
Peila D, Oggeri C (2003) The use of rockfall protection systems in surface mining activity. Int J Surf Min Reclam Environ 17(1):51–64. https://doi.org/10.1076/ijsm.17.1.51.8625
Pierson, L. A., & Van Vickle, R. (1993) Rockfall Hazard Rating System Participant’s Manual.
Sabino-Rojas, E., Felipe-Obando, O. G., & Lavado-Casimiro, W. S. (2017) Atlas de Erosión de Suelos por Regiones Hidrológicas del Peru.
Santana A (2018) Elaboración de modelos hidrológico y de gestión en la cuenca del río Ocoña en Perú y análisis de resultados. UPV, Spain
Santi PM, Russell CP, Higgins JD, Spriet JI (2009) Modification and statistical analysis of the Colorado rockfall hazard rating system. Eng Geol 104(1–2):55–65. https://doi.org/10.1016/j.enggeo.2008.08.009
Santi PM, Hewitt K, VanDine DF, Cruz EB (2011) Debris-flow impact, vulnerability, and response. Nat Hazard 56(1):371–402. https://doi.org/10.1007/s11069-010-9576-8
Saroglou C (2019) GIS-based rockfall susceptibility zoning in Greece. Geosciences (switzerland). https://doi.org/10.3390/geosciences9040163
SENAMHI. (2020) Datos Hidrometeorológicos. Retrieved from https://www.senamhi.gob.pe/?p=estaciones
Shao L (2019) Geological disaster prevention and control and resource protection in mineral resource exploitation region. Int J Low-Carbon Technol 14(2):142–146. https://doi.org/10.1093/ijlct/ctz003
Shirzadi A, Saro L, Hyun Joo O, Chapi K (2012) A GIS-based logistic regression model in rock-fall susceptibility map** along a mountainous road: salavat Abad case study, Kurdistan Iran. Nat Hazard 64(2):1639–1656. https://doi.org/10.1007/s11069-012-0321-3
Stock GM, Luco N, Collins BD, Harp EL, Reichenbach P, Frankel KL, Park M (2012) Quantitative rock-fall hazard and risk assessment for Yosemite Valley, Yosemite National Park. California, USGS - Yosemite National Park - PhD
Turner, A., & Schuster, R. (Eds.). (1996) Rockfall: Characterization and Control. Transportation Research Board, National Research Council.
Valentin C, Poesen J, Li Y (2005) Gully erosion: Impacts, factors and control. CATENA 63(2):132–153. https://doi.org/10.1016/j.catena.2005.06.001
Vandewater CJ, Dunne WM, Mauldon M, Drumm EC, Bateman V (2005) Classifying and assessing the geologic contribution to rockfall hazard. Environ Eng Geosci. https://doi.org/10.2113/11.2.141
Vargas G, Rutllant J, Ortlieb L (2006) ENSO tropical–extratropical climate teleconnections and mechanisms for Holocene debris flows along the hyperarid coast of western South America (17°–24°S). Earth Planet Sci Letter 249(3):467–483. https://doi.org/10.1016/j.epsl.2006.07.022
Verbrugge B, Besmanos B (2016) Formalizing artisanal and small-scale mining: whither the workforce? Res Policy 47:134–141. https://doi.org/10.1016/j.resourpol.2016.01.008
Viscusi, K. (2014) Chapter 7 - The value of individual and societal risks to life and health. In M. Machina & K. B. T.-H. of the E. of R. and U. Viscusi (Eds.), Handbook of the Economics of Risk and Uncertainty (Vol. 1, pp. 385–452). North-Holland https://doi.org/10.1016/B978-0-444-53685-3.00007-6
White, J. L., & Greenman, C. (2008) EG-14 Collapsible Soils in Colorado. Colorado Geological Survey.
Funding
Funding for this project was provided by the Center for Mining Sustainability, a joint venture between the Universidad Nacional San Agustin (Arequipa, Peru) and Colorado School of Mines (USA). We are grateful for field work assistance from Aaron Malone, Kyle Radach, Lee Zamalloa from the Colorado School of Mines, and Jorge Enriquez and Manuel Figueroa from UNSA.
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Santi, P., Manning, J., Zhou, W. et al. Geologic hazards of the Ocoña river valley, Peru and the influence of small-scale mining. Nat Hazards 108, 2679–2700 (2021). https://doi.org/10.1007/s11069-021-04794-7
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DOI: https://doi.org/10.1007/s11069-021-04794-7