基于数值模拟的汾河二库对晋祠泉岩溶水系统渗漏补给作用研究

梁腾飞; 成建梅; 张乃俨; 史文; 开萨尔江·艾合买提

doi:10.11932/karst2020022

基于数值模拟的汾河二库对晋祠泉岩溶水系统渗漏补给作用研究

doi: 10.11932/karst2020022

中国地质大学（武汉）环境学院，武汉 430074

基金项目: 山西省重点项目“晋祠泉复流工程方案研究”（2017045086）

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出版历程
- 发布日期: 2020-04-25

Numerical study on surface water leakage replenishment of the Fenhe 2nd reservoir into the Jinci spring system

School of Environmental Studies, China University of Geosciences, Wuhan, Hubei 430074, China

摘要

摘要: 汾河二库的下闸蓄水，改变了晋祠泉域汾河地表水对岩溶水的渗漏补给条件，对区域岩溶水流场变化有着长远的影响。本研究通过系统梳理库区水文地质条件，勾画地表水渗漏补给岩溶水范围，考虑地层岩性、蓄水高度等因素，确定二库不同蓄水水位下晋祠泉域获渗漏量占比；构建晋祠泉三维岩溶地下水流模型，研究二库渗漏对泉域岩溶地下水补给作用，并预测不同蓄水情景下晋祠泉口水位变化趋势。结果表明：晋祠泉域获渗漏量占比随二库蓄水位非线性变化，最低为92.8%，在二库蓄水位达902 m后稳定在93.7%，而渗漏量与二库蓄水高度呈正相关；泉域岩溶水径流区受渗漏补给作用最显著，其次为排泄区、北部补给区；渗漏补给作用下，地下水位回升值受二库水位和补水距离影响；维持设计水位（905.7 m）和2017年水位（895.9~902.4 m）时，预计晋祠泉口水位分别在2021年7月和2023年1月达到泉口高程。
- 汾河二库 /
- 地表水渗漏补给 /
- 晋祠泉岩溶水系统 /
- 数值模拟
Abstract: Due to the construction of the Fenhe 2nd Reservoir, some essential conditions about surface water leakage into karst groundwater system have changed in the Jinci spring area, which affects the regional karst water flow field changes in future. In this study, based upon systematic analysis of formation lithology and water level in the Fenhe 2nd Reservoir area, the contribution of reservoir leakage to the Jinci spring has been determined. Then, a three-dimensional groundwater flow model has been built to investigate the impacts of reservoir leakage into karst groundwater flow system, and the groundwater level change trend at outlet of the Jinci spring is predicted when the Fenhe 2nd reservoir runs in the different scenarios. The results showed that, the leakage into the Jinci spring area increases with the rise of the reservoir water level, and its proportion changes non-linearly, which lowest is 92.8% and stabilizes at 93.7% after water level reaches 902 m.The groundwater level rise is mainly affected by the recharge distance from the leakage zone. The runoff zone of Jinci spring karst water system is most significantly affected by reservoir leakage, followed by the discharge area and the northern recharge area. Besides, it is concluded that, the groundwater level near the Jinci spring can reach to its spring outlet elevation by July,2021 and January,2023 when the reservoir water level stays at designed level of 905.7 m and the level in 2017, respectively.
- Fenhe 2nd reservoir /
- surface water leakage /
- Jinci spring karst water system /
- numerical study

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