Abstract
After the implementation of the project of returning farmland to forest and ditching and rebuilding land in Yan’an area, the hydrological process in the basin has changed. In order to clarify the dynamic characteristics of groundwater, a typical Nanniwan basin was selected, and groundwater monitoring equipment was installed in the upstream, middle and downstream respectively. The dynamic changes of groundwater in the basin. The results show that among the annual precipitation in the small watershed of the Loess Plateau, June-August (summer) is the wet season, with the most concentrated precipitation, with a total precipitation of 451.8 mm, of which August has the largest precipitation; the groundwater depth gradually increases before September. After September, the upstream and downstream water levels begin to stabilize or rise; the upstream groundwater level fluctuates slightly; the shallow groundwater areas in the middle reaches have large fluctuations due to the large water users; the groundwater depths in the downstream areas are generally between the upstream and Between the middle reaches, the depth of burial showed a slight increase overall.
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