摘要
本文应用非饱和土壤水分运动基本理论,分析研究了北京市南郊平原区半壁店乡雨洪利用试验区在地下水埋深达5—6m以上时,其降雨入渗规律和雨洪利用的潜力.对土壤入渗性能的空间结构进行了分析,论证了所采用的土壤饱和导水率的置信度.经田间人工喷洒试验校核,数学模拟计算所得田间开始积水的时间与实测值极为接近,说明数学模拟计算降雨入渗的正确性.经对土壤不同初始含水率θ_0的入渗特性曲线和等雨强入渗的分析,两者的入渗率f和入渗量F的关系相同,且求得f=f(θ_0,F)的函数关系,这为分析任何降雨过程的入渗产流提供了理论依据.本文对不同频率日降雨的入渗和积水深度等进行了计算,对雨洪利用潜力及应该相应采取的田间工程措施进行了论述.
In this paper,based on the unsaturated soil water movement theory,the pattern of rainfall infiltration and the utilization potential of rainfall in flood season have been investigated in a field experimental station in the southern suburb of Beijing where the groundwater table is 5 to 6 m below ground surface.The spatial structure of the field infiltration characteristics has been analysed,then the correctness of saturated soil conductivity has been checked.The field artificial sprinkling experiments,show that the calculated elapsed times before forming water pond on ground surface agree well with that of experimental values.After analysing the pond infiltration characteristic curves in soils having different initial water content θ,and the infiltration under uniform rainfall intensity,the relations between the infiltration rate f and infiltrated volume F in the above mentioned two conditions are almost the same.Thus the functional relation f=f(θ,F) can be obtained.Finally,the infiltration process and the depth of ponding water under various daily rainfall with different frequency have been calculated,and the utilization potential of rainfall in flood season and corresponding field planning have been discussed.
出处
《水利学报》
EI
CSCD
北大核心
1992年第8期1-14,共14页
Journal of Hydraulic Engineering
基金
国家自然科学基金
