平原地区降雨入渗补给地下水的模拟试验研究方法

降雨入渗补给量在平原地区约占地下水总补给量的50～80%。本文采用人工降雨模拟试验的方法,从分析降雨入渗水分运动特点着手,寻求在不同的土壤和地下水埋深的条件下,入渗总量与降雨量、降雨强度以及土壤前期含水量等要素的关系,并根据蓄满入渗补给的原理,计算入渗总量中补给地下水的部分,同时,又将上述方法得出的结果与其它方法计算的结果及地下水动态资料进行了对比。

AN EXPERIMENTAL STUDY OF THE RECHARGE OF GROUNDWATER BY RAIN INFILTRATION IN THE PLAINS

Rain Infiltration is the main source to recharge groundwater in the plain regions,and 50%-80% of the total recharge come from it.Much research work about this has been done by many authors,and abundant information has been obtained.The major methods for this subject are 1.Trend analysis,2.Lysimeter and,3.Water balance analysis.Each of them has its own advantage and disadvantage.In order to improve the above methods,the simulation method for rain infiltration was adopted in this paper,The function of F=f(P,A) was established through experiments,then groundwater recharge from the infiltration of rain was calculated from the equation Fg=F-△ψ·r·△H/10 There:F=amount of infiltration P=amount of pricipitaion A=rate of precipitaion Fg=groundwater recharge from the infiltration of rain △ψ=deficit of soil moisture r=weight in cubic units H=depth of deficit of soil moisture.The comparison of the results by our method with actual observation shows good agreement.Method and steps of experiments was also introduced in this paper.