摘要
利用潮白河生态补水数据和冲洪积扇中上部150眼监测井数据,圈定补水期间地下水位上升区范围,计算补水期间河道入渗量和含水层储量变化。2021年春季潮白河累计补水量2.2亿m^(3),向阳闸以上各条河道累计入渗量为1.21亿m;。采用动态法计算,潮白河地下水库范围内地下水储量增加了 5353.17 万 m;。截至补水结束,地下水位上升区面积为606 km^(3),最大上升幅度达14.38 m;距河道近的观测井,其地下水位上升对补水的响应时间更短;地下水库库区内上下游地区渗透性差异性非常小,监测井对补水的响应时间比较接近。2021年地下水位动态变化特征显示,在枯水期利用地表水对地下水进行连续性补给可以达到比较好的涵养效果。
Groundwater level data of 150 monitoring wells and ecological replenishment data in the middle and upper parts o the alluvial-proluvial fan of Chaobai River are used to delineate the area of groundwater level rise, and calculate infiltration and aquifer reserve changes of the river channel during replenishment period. The results show that the cumulative amount of fresh water replenishment in spring 2021 was 220 million m~3, and a total of 121 millions m~3surface water in all the rivers above Xiangyang flood gate infiltrated into the groundwater.The groundwater storage within Chaobai River Groundwater Reservoir increased by 53.5317 millions m~3calculated by groundwater dynamic method. At the end of the water replenishment, the rising area was up to 606 km~2, with a maximum rise level of 14.38 m. It is found that the closer the distance between the monitoring well and the river, the shorter the response time of groundwater level rise to water replenishment. The permeability difference between upstream and downstream areas of the groundwater reservoir is very small, and the response time to water replenishment between monitoring wells is similar. The dynamic groundwater level change characteristics in 2021 indicates that continuous recharge o groundwater by surface water during dry season can achieve fairly good reservation effect.
作者
李海军
LI Haijun(Bejing Institute of Geology,Beijing.100195,China)
出处
《城市地质》
2022年第2期149-157,共9页
Urban Geology
基金
北京市地下水监测网运行(PXM2021_158305_000002)
北京市平原区控高水位研究及典型区浅层地下水资源评价项目联合资助。
关键词
潮白河
生态补水
储变量
地下水涵养
Chaobai River
ecological water replenishment
reserve change
groundwater reservation
