大兴区奥陶系岩溶裂隙水保护对策

Protection of Ordovician system karst fissure water in Daxing district

北京市大兴区供水主要以地下水为主,而其中奥陶系岩溶裂隙水占较大比重。通过对奥陶系岩溶裂隙水的补给、径流和排泄以及水化学特征等水文地质条件的综合分析,得出该含水层的主要补给来源为第四系水的垂向越流入渗,进而建立第四系、岩溶裂隙含水层联合的地下水数值模型,划定水源地保护区,并分别制定水源地区和非水源地区的保护措施,为大兴区奥陶系岩溶裂隙水的保护提供科学依据。

Groundwater is the main drinking water resources in Daxing district of Beijing, much of that is Ordovician karst fissure water. This paper analyzed the conditions of groundwater recharge, runoff, drainage and ehemical characteristics, and got the main replenishment sources for the Ordovician karst fissure water, which is the upper aquifer leaking recharge, and developed the groundwater flow numerical model of quaternary aquifer and karstie fractured aquifer, then delineated groundwater wellhead protection zones, and carried out the measures on the protection of water resources and other zones. These provided scientific evidences for protecting the Ordovician kant fissure water.