淤地坝土壤水来源与分布研究

The Study of Soil Water Source and Its Distribution in Soil-Saving Dam

选取韭园沟流域作为研究对象,通过实地采样,探索流域地表径流、地下水、降水和土壤水等各种水体氢氧稳定同位素分布特征,为研究淤地坝淤积规律和坝控流域中淤积的水沙分布规律提供基础。应用氢氧稳定同位素示踪技术,分析了淤地坝淤积体中土壤水的分布和来源:土壤水的组成中天然降水的含量始终不大;土壤水从浅到深的赋存规律由"较为平均分布、以地表径流为主",逐步变成"地下水为主、地表径流为辅"。结合在纵深方向上的土壤水份分布情况,发现土壤水含水量的变化和同位素的变化存在相同的分布特征。

Jiuyuangou watershed is selected as the studying objective.The field sampling procedure is used to probe into the hydrogen and oxygen stable isotope distribution features of various kinds of water body such as runoff,rainfall and soil water,etc.So as to determine the sedimentation laws of soil-saving dam and to provide the base for studying water and sediment distribution laws of sedimentation in the soil-saving dam controlled watershed.Also,the Hydrogen and Oxygen stable isotope tracer technique is adopted to analyse the distribution and source of soil water in the siltation body of soil-saving dam.The contents of natural rainfall water account for small quantity of soil water components.The storage law from surface to deep in soil water is average distribution with surface runoff in the main,which is gradually to become subsurface water in the main and surface runoff in the second.In combination with soil water distribution conditions in the deep longitudinal direction,it is found that the variation in soil water contents is of the same distribution law as the isotope variation.