Research on the Adjustment of Groundwater Storage in North China Plain

According to the geological and hydrogeological conditions in the North China Plain, this paper systematically analyzed the strata,storage space,water source and advantageous areas for adjusting groundwater storage.The alluvial-pluvial fans and ancient stream channels are the advantageous areas for adjusting groundwater storage,whose space has been calculated.The maximum space for adjusting groundwater storage in the North China Plain is 1478.05×108m3, 70%of which is in alluvial-pluvial fan areas,while the rest 30%is in ancient stream channel areas. Judging from present condition of groundwater level,the space for adjusting groundwater storage is 326.29×108m3,88%of which is in alluvial-pluvial fan areas,and the rest 12%is in ancient stream channel area.In this paper,we selected 7 advantageous areas,which were Chaobaihe alluvial-pluvial fan,Yongdinghe alluvial-pluvial fan,Tanghe-Dashahe alluvial-pluvial fan,Hutuohe alluvial-pluvial fan,Shahe-Minghe alluvial-pluvial fan,Anyanghe alluvial-pluvial fan and Yuhe-Huangshuihe alluvial-pluvial fan.The space for adjusting groundwater storage in these areas was calculated and the water sources and methods of adjusting groundwater storage were discussed.The total space for adjusting groundwater storage was 45.9×108m3.This paper advanced two projects for adjusting groundwater storage:the first project was the artificial recharge of groundwater by using local water resources,and the second project is the internal adjustment of groundwater systems by decreasing groundwater exploitation after implementing South-to-North Water Transfer Project.If the first project of adjusting groundwater storage is implemented in the 7 advantageous areas,groundwater recharge yield would increase 12.37×108m3/d.The effects of adjusting groundwater storage in Chaobaihe alluvial-pluvial fan,Yongdinghe alluvial-pluvial fan and Hutuohe alluvial-pluvial fan were estimated with the method of groundwater numerical analog. The results showed that groundwater environment would be remarkably improved after actualizing the projects of adjusting groundwater storage.

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