北京永定河陈家庄泉成因分析

Genetic Analysis of Chenjiazhuang Spring in Yongding River,Beijing

陈家庄泉位于永定河畔,在永定河生态环境治理工程开展以来至2019年,泉水复涌。为更好的管理和保护陈家庄泉,实现永定河生态环境治理及区域水资源战略储备,开展泉水成因分析及泉域划分研究。通过泉域范围雨水、河水、地下水同位素和水化学样测试分析,获取泉水的补给来源、补给高程及补给温度;在以上分析的基础上,结合区域地质、水文地质条件,划定泉水汇水面积(泉域范围)。分析结果表明陈家庄泉赋存于奥陶系灰岩含水层中,区域岩溶地下水补给来源为大气降水和永定河河水,泉水为一裸露型侵蚀溢流泉,泉水补给高程为736m,补给温度为13.12℃,泉域汇水面积为30.6km^(2)。

Chenjiazhuang Spring is located on the Yongding River.Since the ecological environment improve-ment project of Yongding River was carried out,the spring flowed out in 2019.In order to protect and manage Chenjiazhuang Spring,realize the ecological environment management of Yongding River and regional water resources strategic reserve,spring origin analysis and spring domain division were carried out.The recharge source,recharge elevation and recharge temperature of the spring were obtained by testing and analyzing the iso-tope and hydrochemistry samples of rainwater,river water and groundwater in the spring area;On the basis of the above analysis,combined with the regional geological and hydrogeological conditions,delimit the spring catchment area.The results show that the Chenjiazhuang spring exists in the Ordovician limestone aquifer,the regional karst groundwater recharge source is atmospheric precipitation and Yongding River water,the spring is an exposed erosion overflow spring,the spring recharge elevation is 736 m,the recharge temperature is 13.12℃,the catchment area of the spring is 30.6 km^(2).