Groundwater systems in bare and covered karst aquifers: evidence from tracer tests, hydrochemistry, and groundwater ages
Groundwater systems in bare and covered karst aquifers: evidence from tracer tests, hydrochemistry, and groundwater ages
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裸露和覆盖岩溶含水层的地下水系统：来自示踪剂测试、水化学和地下水年龄的证据
DOI：
10.1007/s12665-019-8622-4
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发表时间：
2019-10
影响因子：
2.8
通讯作者：
Tang Changyuan
中科院分区：
文献类型：
--
作者：
Jiang Guanghui;Guo Fang;Tang Changyuan
桂林东部地区沿着漓江流域是一个以岩溶为主的水文系统。盆地的两个主要地形特征是峰丛洼地和峰林。尽管这些地区代表相邻单元，但它们具有不同的地下水运动模式。本研究通过几种技术描述了不同水文地质分区的地下水和溶质运动。结果表明，峰丛洼地与峰林的地形边界明显。然而，在这些地形带之间存在一个过渡带，可以根据地下水运动来确定。我们采用了几种被广泛认为是有效的方法。示踪剂测试进行了过渡区，水化学技术被用于峰林，地下水年龄测定的基础上CFCs在整个研究区。过渡带地下水主要输导通道发育，但过渡带地下水流速度较峰丛区缓慢。次要管道也占过渡区总流量的很大比例。平原内的溶质迁移，这是通过分析硝酸盐，控制混合和距离效应。最大硝酸盐浓度是有限的，在当地的规模。区域尺度上的硝态氮浓度梯度与地下水运动无关，表明地下水补给分散，沿河流沿着分布。年龄测定表明，平原区地下水的年龄大于裸露山区。这是由于含水层中岩溶介质的特性导致了新老水的强烈混合。我们在裸露/覆盖岩溶含水层的地下水系统的调查提供了有效的地下水管理的决策数据。
The east Guilin region contains a karst dominated hydrological system along the Lijiang River. The two main topographic characteristics of the basin are peak cluster depression and peak forest. Despite the fact that these areas represent adjacent units, they have different groundwater movement patterns. This study describes the groundwater and solute movement in the different hydrogeological sub-regions via several techniques. Our results indicated that the topographic boundary between the peak cluster depression and the peak forest is clear. However, a transition zone exists between these topographic zones, and it can be determined in terms of groundwater movement. We employed several methods that are widely considered to be effective. Tracer tests were conducted in the transition zone, hydrochemistry techniques were used in the peak forest, and groundwater age dating based on CFCs was employed throughout the study area. The main conduits could be found in the transition zone, but the groundwater flow was much slower in the transition zone than in the mountain peak cluster area. Minor conduits also accounted for a high proportion of the total flow in the transition zone. The solute migration within the plain, which was determined by analyzing the nitrates, was controlled by mixing and distance effects. The maximum nitrate concentration was limited at the local scale. The nitrate concentration gradient at the regional scale was not related to the groundwater movement, indicating that the groundwater recharged in a dispersed manner and discharged at discrete locations along the river. The age dating revealed that the groundwater was older in the plain than in the bare mountain zone. This was due to the strong mixing of young and old water, which was the result of the characteristics of the karst media in the aquifer. Our investigation of the groundwater system in a bare/covered karst aquifer provides data for decision-making in effective groundwater management.
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影响因子：
6.4
作者：
Y. Dao-xian;C. Drogue;D. Aide;L. Wenke;Cai Wutian;P. Bidaux;M. Razack
通讯作者：
Y. Dao-xian;C. Drogue;D. Aide;L. Wenke;Cai Wutian;P. Bidaux;M. Razack
影响因子：
3.9
作者：
L. Plummer;E. Busenberg;J. Böhlke;D. L. Nelms;R. Michel;P. Schlosser
通讯作者：
L. Plummer;E. Busenberg;J. Böhlke;D. L. Nelms;R. Michel;P. Schlosser
影响因子：
6.7
作者：
T. Thayalakumaran;K. Bristow;P. Charlesworth;T. Fass
通讯作者：
T. Thayalakumaran;K. Bristow;P. Charlesworth;T. Fass
影响因子：
6.3
作者：
Huebsch, M.;Fenton, O.;Blum, P.
通讯作者：
Blum, P.
影响因子：
2.6
作者：
SCHINDLER J S
通讯作者：
SCHINDLER J S