有采煤活动的岩溶流域多层含水层的水文过程:水化学和同位素的启示

IF 4.7 2区 地球科学 Q1 WATER RESOURCES Journal of Hydrology-Regional Studies Pub Date : 2024-10-17 DOI:10.1016/j.ejrh.2024.102016
Lanchu Tao , Yunhui Zhang , Xingcheng Yuan , Qingsong Chen , Jinhai Yu , Yiqi Ma , Honghao Liu , Chunlin Tu
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引用次数: 0

摘要

研究区域老场喀斯特流域(LCKW)位于中国西南部云南省东部,是中国西南部受采煤活动影响的代表性喀斯特地区。研究重点由于复杂的自然和人为过程,确定岩溶流域多层含水层的水文过程具有挑战性。本研究试图利用水化学和 D、O、Sr、S 和 C 同位素来澄清泸沽湖水文概念模型。对该地区水文的新认识地表水和多层地下水的水化学类型为 SO4-Ca-Mg、HCO3-SO4-Ca 和 HCO3-Ca。陨水和凝结水是主要的补给来源。主导水化学组成的主要过程包括硫化物氧化溶解、碳酸盐溶解、阳离子正交换和农业活动。矿井水、河水和浅层煤床水的 SO42- 浓度升高主要源于龙潭地层含煤地层中黄铁矿的氧化作用,而远离矿井的深层和地下水由于含水层的存在,几乎不受 SO42- 的污染。地表水和多层地下水的 HCO3- 浓度主要来自碳酸盐溶解和土壤中的 CO2,矿井水也受到大气中 CO2 的影响。正阳离子交换导致 Na+ 浓度增加。农业活动导致含水层中的 NO3-、Cl- 和 K+ 离子增加,尤其是在大型岩溶溶洞附近。根据上述结果,建立了荔枝角湾多层含水层的水文模型。这些发现将为了解全球复杂岩溶流域的水文过程提供宝贵的指导。
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Hydrological processes in multi-layered aquifers of a karst watershed with coal mining activity: Insights from hydrochemistry and isotopes

Study region

The Laochang Karst watershed (LCKW) is located in eastern Yunnan Province, southwestern China. It is the representative karst area affected by coal-mining activities in southwestern China.

Study focus

Identifying hydrological processes of multi-layered aquifers in karst watersheds is challenging due to complex natural and anthropogenic processes. This study attempts to clarify the hydrological conceptual model of the LCKW using hydrochemistry and D, O, Sr, S, and C isotopes.

New hydrological insights for the region

Surface water and multi-layered groundwater have the hydrochemical types of SO4-Ca·Mg, HCO3·SO4-Ca, and HCO3-Ca. Meteoric water and condensate were the major recharge sources. The main processes dominating hydrochemical compositions consist of sulfide oxidative dissolution, carbonate dissolution, positive cation exchange, and agricultural activities. Elevated SO42− concentration in the mine water, river water and shallow coalbed water mainly originated from the oxidation of pyrite in the coal-bearing strata of the Longtan Formation. whereas the deeper layers and groundwater away from the mines were hardly contaminated by SO42− due to the presence of aquiclude. HCO3 concentrations of surface water and multi-layered groundwater were mainly derived from carbonate dissolution and soil CO2, and mine water was also influenced by atmospheric CO2. Positive cation exchange contributed to increasing Na+ concentration. Agricultural activities contributed NO3, Cl, and K+ ions in aquifers, especially near large karst fallout caves. A hydrological model of multi-layered aquifers in the LCKW was built based on the above results. These findings will provide valuable guidance for understanding the hydrological processes of complex karst watersheds worldwide.
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来源期刊
Journal of Hydrology-Regional Studies
Journal of Hydrology-Regional Studies Earth and Planetary Sciences-Earth and Planetary Sciences (miscellaneous)
CiteScore
6.70
自引率
8.50%
发文量
284
审稿时长
60 days
期刊介绍: Journal of Hydrology: Regional Studies publishes original research papers enhancing the science of hydrology and aiming at region-specific problems, past and future conditions, analysis, review and solutions. The journal particularly welcomes research papers that deliver new insights into region-specific hydrological processes and responses to changing conditions, as well as contributions that incorporate interdisciplinarity and translational science.
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