Impact of topographic fluctuation of riverbed on surface water-groundwater-wetland water interaction
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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。
Abstract: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.
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Key words:
- riverbed topography /
- surface water /
- groundwater /
- wetlands water /
- interaction
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表 1 模拟场景设置
Table 1. Simulated Scenarios
编号 模拟场景 主要变量 河床起伏 Case 1 对照模型 河床地形 无 Case 2 河床地形起伏 河床地形 有 表 2 不同河床起伏变化条件下地表水-地下水-湿地水转化水量
Table 2. Exchange flux between surface water-groundwater-wetland in the scenarios with different riverbed topography
模拟
场景hm/m ω 地表水-地下水转化量
/(m3·d−1)地下水-湿地水转化量
/(m3·d−1)Case 1 0 0 55.25 25.286 Case 2 1 0.10π 55.35 25.619 0.08π 56.27 26.214 0.05π 55.75 25.308 1.5 0.05π 55.37 25.158 0.5 55.63 25.211 表 3 不同河床起伏特征条件下含水层不同点位地下水年龄统计
Table 3. Groundwater age at different locations in the aquifer in different scenarios with different riverbed topography
hm /m ω 地下水年龄/d hm /m ω 地下水年龄/d 计算点A 计算点B 计算点C 计算点A 计算点B 计算点C 0.5 0.05π 12.69 15.74 151.48 1.0 0.10π 11.69 13.55 145.65 1.0 0.05π 10.27 16.87 149.65 1.0 0.08π 10.55 15.08 147.40 1.5 0.05π 8.80 17.13 148.86 1.0 0.05π 10.27 16.87 149.65 -
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