平潭岛芦洋埔土壤水与浅层地下水的关系研究

Study on Relationship between Soil Water and Shallow Ground Water in Luyangpu of Pingtan Island

研究了平潭岛芦洋埔海积平原土壤水与浅层地下水的关系。结果表明:降雨后各土层呈现出不同的水势变化,0～40 cm土层为快速变化带,40～60 cm土层为缓变化带,60 cm以下土层为稳定变化带;研究区土壤水分运动特征能够在短时间内随降雨情况的变化而发生转变,零通量面仅在发散和聚合型土壤水分运动特征下存在,且只在缓变化带中移动并最终消失;土壤含水率与降雨量呈正相关;采用水分通量法和水分平衡法分别计算了研究区由降雨所带来的土壤水补给地下水的量,两者的相对误差为9.50%～19.00%。

The relationship between soil water and shallow ground water in marine depositional plain of Luyangpu, Pingtan island was studied. The results indicated that： different water potential changes appeared in various soil layers after rainfall, the 0-40-cm-deep soil layer was rapid-change layer, the 40-60-cm-deep soil layer was slow-change layer, and the soil layer below 60 cm was little-change layer; the movement characteristics of soil water in the research area changed in a short time as the rainfall changed, the zero-flux plane existed only in the divergence-type and aggregate-type movements of soil water, and it moved only in the slow-change soil layer and finally disappeared; there was a positive correlation between soil water rate and rainfall. The Darcian approach method and the water balance equation method were respectively used to calculate the ground water supplement with soil water from the rainfall in the research area, and the relative error of calculation results obtained by these two methods varied from 9.50% to 19.00%.