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河水-地下水交互带对河流和地下水水质保护具有重要作用.为研究河水-地下水侧向交互带中交互流的运动机制,以重庆市马鞍溪为研究对象,选取旱季2015年12月至2016年4月为研究期,对河水、交互带及地下水的水位、水温、pH、Cl-进行监测,结合对交互带沉积物渗透系数、水体氢氧稳定同位素和溶解有机碳浓度的分析.结果表明,沉积物渗透系数对交互带水位变化及交互流运动有重要的影响,使得交互流在距河岸10cm附近易受降水下渗及蒸散发的影响.研究期间以地下水补给河水为主,地下水在补给过程中对交互流的影响逐渐减弱.交互流在距河岸30cm附近仍以受地下水影响为主,地下水运动至距河岸10~30cm后与降水、河水的混合作用增强,水分受沉积物质地影响在距河岸10cm附近富集,并通过交互流不断补给河流,从而对河水水质造成潜在影响.
River-groundwater interaction plays an important role in the protection of rivers and groundwater quality.In order to study the movement mechanism of the interactive flow in the river-groundwater lateral interaction belt, taking Ma’angxi of Chongqing as the research object, the author selects the dry season from December 2015 to 2016 4 Month as the study period, the water level, water temperature, pH and Cl- of river, intertidal zone and groundwater were monitored, and combined with the analysis of sediment permeability coefficient, hydrogen and oxygen stable isotope and dissolved organic carbon concentration in the interaction zone, the results showed that sediment The permeability coefficient of the material has an important influence on the change of the water level and the interaction flow of the interaction belt, which makes the interactive flow vulnerable to the infiltration and evapotranspiration near the riverbank of 10 cm. During the study period, the groundwater was mainly supplied to the river and the groundwater was recharged The impact on the interaction flow is gradually weakened.The interaction flow is still mainly influenced by groundwater near 30cm away from the river bank, and the groundwater movement reaches 10 ~ 30cm away from the riverbank, then the mixing with precipitation and river water is enhanced, and the water is affected by the sediment material. 10cm enrichment around, and through the interaction of continuous stream recharge rivers, which have a potential impact on river water quality.