试论黄河下游平原地下水临界深度及其允许持续时间问题

本文主要论述两个问题:是地下水临界深度及其确定方法。主要论述了黄河下游平原轻质土和粘质土地区地下水临界深度的数值,并谈了几种确定地下水临界深度的方法,如自然含水与毛管水分裂点法、自然含水率曝晒法、地下水蒸发量筒测法、定位观测及野外调查法等。二是地下水允许持续时间问题。主要论述了地下水允许持续时间的研究方法,并谈了不同地下水埋藏深度和土壤原始含盐量,其地下水允许持续时间也不一样。

On Study the of Groundwater Critical Depth and Its Allowable Duration of the Yellow River Cover Reaches Flatlnads

Two problems are chiefly discussed in this paper: Firstly, it is about droundwater critical depth and ascertain method which maihly discuss about the numerical value of groundwater critical depth of light soil and clay soil regions of the yellow River lower reaches flatlands; also discuss several mets ods to ascertain the groundwater critical depth, such as native water-beaing and capillary water split spot; native water ratio exposing to the sun; groundwater evaporation core method; position-finding and field survey, etc. Secondly, it is about the problem of groundwater allowable duration whichmainly discusses the researching method about the groundwater allowable duratin; and the different grounduwater burried depth and the soil primitive salt content are also discussed, their groundwater allowable durations are quite different.