基于示踪试验和时域矩分析的岩溶管道溶质运移规律研究
Laboratory and temporal moment analysis of tracer-based solute transport in karst conduits
王欣桐 1张一驰 2林鹏 2许振浩3
作者信息
- 1. College of Civil and Transportation Engineering,Hohai University,Nanjing 210024,China
- 2. Geotechnical and Structural Engineering Research Center,Shandong University,Ji?nan 250061,China
- 3. Geotechnical and Structural Engineering Research Center,Shandong University,Ji?nan 250061,China;School of Qilu Transportation,Shandong University,Ji?nan 250061,China
- 折叠
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.
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.
关键词
岩溶管道/示踪试验/溶质运移/时域矩分析Key words
karst conduits/tracer tests/solute transport/temporal moment analysis引用本文复制引用
基金项目
National Natural Science Foundation of China(52022053)
National Natural Science Foundation of China(52009073)
Natural Science Foundation of Jiangsu Province,China(BK20220987)
Natural Science Foundation of Shandong Province,China(ZR201910270116)
Jiangsu Funding Program for Excellent Postdoctoral Talent,China(2022ZB189)
出版年
2023
NETL
NSTL
维普
万方数据