小岭村改造项目对济南泉域小岭强渗漏带的影响

Impacts of Xiaoling Urban Village Renovation Project on Leakage Zone of Baotu Spring Area,Jinan

为了解小岭强渗漏带特征及小岭城中村改造项目对强渗漏带的影响,采用野外试验、遥感解译及电法勘探等方法,分析了小岭强渗漏带地形地质、植被覆盖度等,并计算了项目建设前后的地下水入渗量,结果表明:小岭强渗漏带东部地势高于西部地势;第四系覆盖层厚度较薄,在0~2.5 m,下部为基岩界面,地下水补给能力较强;植被覆盖情况较好,以中覆盖度和中低覆盖度植被覆盖为主,占整个流域面积的65.82%;按照多年平均降雨量计算,完全自然条件下,小流域地下水入渗量为95.13万m^3/a,现状开发利用条件下地下水入渗量为85.92万m^3/a,现状条件下地下水入渗量减少9.21万m^3/a,减少量占自然条件下地下水入渗量的9.68%;小岭村改造项目建设前后硬化面积减少0.026 km^2,地下水入渗量增加0.62万m^3/a,表明该项目有利于泉域补给区地下水入渗量的增加。研究结果对济南泉域保护和实现济南地下水资源保护与可持续利用具有重要的实际价值和意义。

In order to understand the characteristics of Xiaoling strong leakage zone and the impacts of Xiaoling urban village renovation project on the strong leakage zone,we investigated into the topographic geology and vegetation coverage of Xiaoling strong leakage zone via field test,remote sensing,interpretation and electrical prospecting.We also calculated the groundwater leakage recharge before and after the project construction.The east terrain of Xiaoling strong leakage zone is higher than the west.The Quaternary overburden layer is thin,ranging between 0 and 2.5 meters.Under the Quaternary lays the bedrock interface with strong groundwater recharge capacity.Vegetation coverage in the strong leakage zone is mostly at mid-level and mid-low level,occupying 65.82%of the total catchment area.According to average annual rainfall,the annual groundwater recharge of Dianzi-Erxian catchment is 95.13×104 m^3/a under fully natural conditions,and 85.92×104 m^3/a under the condition of current exploitation and utilization.In current condition,the groundwater recharge is reduced by 9.21×104 m^3/a,which accounts for 9.68%of that under natural condition.After the construction of Xiaoling urban village renovation project,the hardening area decreased by 0.026 km^2,and the groundwater recharge increased by 0.62×104 m^3/a in the project area,which indicates that the project is conducive to the increase of groundwater recharge in the spring recharge area.The research results are of practical value and significance for the protection of Jinan spring area and the protection and sustainable utilization of Jinan groundwater resources.