摘要
地表水动力条件变化及河床沉积物岩性空间差异造成河床地形在空间上起伏变化是水沙界面压力空间分布的主要影响因素,影响地表水-地下水、地下水-傍河湿地水交互过程。为研究河床地形起伏变化对地表水-地下水-湿地水交互过程的影响机理,在黄河下游开封柳园口设置研究断面,统计分析河床地形起伏变化特征数据,建立半理想化地下水流数值模型,分析地表水-地下水-湿地水相互作用过程。结果表明:(1)与平整河床相比,河流横断面河床地形空间起伏变化可增大地表水-地下水转换量及地下水-湿地水转化量;(2)河床地形空间起伏变化使河床下伏含水层发育不同级次的地下水流系统,改变了地下水流路径及其径流时间,与平整河床地形相比,河流横断面河床地形起伏变化使得河流下伏含水层地下水流路径复杂化,近河床界面的浅部含水层不同位置发育有滞留区,且随着河床地形起伏程度越大,湿地侧河床下伏含水层及湿地附近含水层地下水年龄增大。研究结果可为黄河下游悬河段地表水-地下水-湿地协同保护提供理论依据。
Spatial variation of riverbed topography caused by the difference of dynamic conditions of surface water affects spatial distribution of pressure at water-sediment interface,which has an important influence on the interaction between surface water and groundwater and the interaction between groundwater and wetland water.To reveal the influence mechanism of riverbed undulations on surface water-ground water interaction,This study established a groundwater flow numerical simulation model and analyzed the influence mechanism of riverbed topography on surface water-groundwater-wetland interaction process based on the characteristics of riverbed topographic undulations of a profile at Liuyuankou,Kaifeng,the lower reaches of the Yellow River.The results show that:(1)compared with flat riverbed,the variable riverbed topography leads to an increasing exchange fluxes between surface water and between groundwater and wetland water;(2)The spatial fluctuation of riverbed topography forms different levels of groundwater flow systems at the bottom of the riverbed,and changes the groundwater flow path and the travel time.Compared with the flat bed topography,the variation of the topography of river bed complicates the groundwater flow path in the underlying aquifer.Retention areas are developed in different positions in the aquifer near the bed interface.Moreover,the greater topography degree of the river bed,the older the groundwater age in the aquifer beneath the wetland bed and aquifer near the wetland.This study can provide theoretical basis for promoting the coordinated protection of surface water,groundwater and wetland water in the suspended reach of the lower Yellow River.
作者
张丽娟
吴佩鹏
张盛艳
张阳
ZHANG Lijuan;WU Peipeng;ZHANG Shengyan;ZHANG Yang(Ecological Environment Geo-Service Center of Henan Geological Bureau,Zhengzhou,Henan 450053,China;College of New Energy and Environment,Jilin University,Changchun,Jilin 130021,China;Technology Research Center for Mine Environment Ecological Restoration Engineering of Henan,Zhengzhou,Henan 450053,China)
出处
《水文地质工程地质》
CSCD
北大核心
2024年第1期22-29,共8页
Hydrogeology & Engineering Geology
基金
国家自然科学基金项目(42102286)
河南省自然资源厅2020年度新立项目(2020-7)。
关键词
河床地形起伏
地表水
地下水
湿地水
相互作用
riverbed topography
surface water
groundwater
wetlands water
interaction
