RAINFALL INFILTRATION RECHARGE FUNCTION BUILDINGWITH REGRESSION ANALYSIS WITH LYSIMETER DATA

摘要

Accurately calculating the quantity of rainfall infiltration recharge (RIR) to groundwater is critical importance to thernevaluation and management of groundwater resources. Enormous works have been done to estimate the quantity of RIR and tornunderstand the processes of infiltration recharge by many methods including field tests, lysimeters and etc. There are 35 lysimetersrnwith 7 kind of soil and 5 different depth (1m, 2m, 3m, 5m and 7m) installed in Zhengzhou Groundwater Balance Test Field tornmeasure the infiltration recharge flux and evaporation flux under conditions of fixed water tables at the bottoms of the soil columns.rnA simple meteorological observation has built to measure the rainfall, wind rate and water evaporation on ground surface. Some keyrninfect factors have been chosen to construct the rainfall infiltration recharge functions (RIRF) for different kinds of soil after thernrelationship between the RIR and rainfall and evaporation in the corresponding and former period by uniform design method.rnComparing the measured data with the calculated data by RIRF, the small difference denotes that using the RIRF can calculate thernRIR more accurately than conventional method of product of rainfall and constant RIR coefficient.