| 分层沉积物河流-地下水系统水力连通演化 |
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| 引用本文： | 程大伟,詹红兵,李洁,邓婧芫.分层沉积物河流-地下水系统水力连通演化[J].水科学进展,2022,33(1):135-144. |
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| 作者姓名： | 程大伟 詹红兵 李洁 邓婧芫 |
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| 作者单位： | 1.长安大学水利与环境学院, 陕西 西安 710054 |
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| 基金项目： | 国家自然科学基金资助项目(42077183);中央高校基本科研业务费经费资助项目(300102290106)。 |
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| 摘 要： | 为揭示河流-地下水系统水力连通状态演化特征，以分层沉积物季节性失水河流-地下水系统为研究对象，解析水力连通状态判别标准，剖析系统内渗流变异机制，阐明水力连通状态变异类型与机制，完善演化理论框架。构建6个具有不同分层沉积物的河流-地下水系统渗流模型，利用数值模拟方法模拟水力连通状态演化及变异。结果表明:湿润锋曲线和饱和带前锋曲线是刻画水力连通状态演化的特征曲线；沉积物内渗透能力和毛细力作用差异是导致变异的原因。湿润锋曲线变异类型为陡坎型、缓坡型或交替型；饱和带前锋曲线变异类型为后移型、前突型或交替型。研究成果为进一步开展河流-地下水系统内水量评估、物质迁移和能量传输研究提供理论支撑。
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| 关 键 词： | 河流-地下水系统 水力连通状态 分层沉积物 湿润锋曲线 饱和带前锋曲线 变异 |
| 收稿时间： | 2021-04-04 |
Evolutional characteristics of the hydraulic connectivity in a stream-groundwater system with stratified sediments |
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| CHENG Dawei,ZHAN Hongbing,LI Jie,DENG Jingyuan.Evolutional characteristics of the hydraulic connectivity in a stream-groundwater system with stratified sediments[J].Advances in Water Science,2022,33(1):135-144. |
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| Authors: | CHENG Dawei ZHAN Hongbing LI Jie DENG Jingyuan |
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| Institution: | 1.School of Water and Environment, Chang'an University, Xi'an 710054, China2.Key Laboratory of Subsurface Hydrology and Ecological Effect in Arid Region (Chang'an University), Ministry of Education, Xi'an 710054, China3.Department of Geology and Geophysics, Texas A&M University, College Station, TX 77843-3115, USA |
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| Abstract: | To reveal the evolutional characteristics of a stream-groundwater system, this paper takes the seasonal losing stream-groundwater system with stratified sediments as the research object. The criterion for the hydraulic connected states and the mechanism of the seepage in the system are analyzed. The variation types and mechanism of hydraulic connected states are clarified. A theoretical framework of stream-groundwater system hydraulic connected states is developed, and six stream-groundwater system models with different stratified sediment types are constructed. The evolution and variation of hydraulic connected states of the six stream-groundwater models are simulated by numerical simulations, and the results show that the wetting front curve and saturation front curve are of great importance to describe the evolutional process of the hydraulic connected states and can be regarded as characteristic curves for analysis. The difference of permeability and capillary force caused by different types of sediments is the fundamental driving force for the variation of the evolutional process. The variation types of wetting front curve include steep, gentle slope or alternate between steep and gentle slopes, and the variation types of saturation front curve include backward, forward, or alternate between backward and forward. The results of this study provide theoretical support for further research on water quantity assessment, mass transport and energy transfer in stream-groundwater systems. |
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| Keywords: | evolution of stream-groundwater system hydraulic connectivity stratified sediments wetting front curve saturation front curve variation |
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