Abstract
Tracer test is an effective tool for characterizing the complex conduits and exploring the solute transport law for karst aquifers. In this study, three generalized karst conduit models were established, including auxiliary side conduit, cave, and waterfall. A series of tracer tests were conducted to obtain tracer residence time distribution curves. These tracer curves were used for performing temporal moment analysis to estimate fluid flow characteristics and solute transport process of karst conduit models. The results demonstrate that the residence time distribution curves are mainly constrained to the length and path differences of auxiliary side conduits, the lengths and geometries of pools, and the lengths and numbers of waterfalls. Although the multi-peaked residence time distribution curve is the basis for judging the existence of multiple karst conduits with path differences, the number of paths cannot be determined directly. Moreover, it can be presumed that there are some caves or waterfalls when the residence time distribution curve has a long tail. This study provided some useful references for the development of solute transport theory in karst conduits.
摘要
地下水示踪试验可用于表征复杂岩溶管道结构特征、探究含水层溶质的运移规律。本文尝试建 立了支管道、溶潭及跌水三类岩溶管道模型,并开展了一系列示踪试验以获取相应的示踪停留时间分 布曲线。通过对上述停留时间分布曲线进行时域矩分析,分析了岩溶管道内的流体流动特性及溶质运 移过程规律。结果表明,示踪曲线主要受支管道长度及路径差异、溶潭长度及形状、跌水长度及数量 的影响。示踪曲线的多峰性是判断地层存在多条路径差不同的运移通道的重要依据之一,值得注意的 是峰的数量不能直接用于判定路径数量。此外,当示踪曲线呈现长拖尾状时,可推测地层内存在溶潭 及跌水等岩溶构造。本文研究结果为岩溶管道溶质运移理论研究提供了一些有益的参考和借鉴。
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WANG **n-tong provided and analyzed the experimental data and edited the draft of the manuscript. ZHANG Yi-chi conducted the literature review. LIN Peng edited the manuscript. XU Zhen-hao developed the overarching research goals and edited the manuscript.
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WANG **n-tong, ZHANG Yi-chi, LIN Peng and XU Zhen-hao declare that they have no conflict of interest.
Foundation item: Projects(52022053, 52009073) supported by the National Natural Science Foundation of China; Project(BK20220987) supported by the Natural Science Foundation of Jiangsu Province, China; Project(ZR201910270116) supported by the Natural Science Foundation of Shandong Province, China; Project(2022ZB189) supported by the Jiangsu Funding Program for Excellent Postdoctoral Talent, China
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Wang, Xt., Zhang, Yc., Lin, P. et al. Laboratory and temporal moment analysis of tracer-based solute transport in karst conduits. J. Cent. South Univ. 30, 306–330 (2023). https://doi.org/10.1007/s11771-023-5230-y
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DOI: https://doi.org/10.1007/s11771-023-5230-y