丘陵赤红壤降雨入渗产流模型及其变化特征

在分析南亚热带丘陵赤红壤降雨入渗和产流过程基础上 ,依据田间实测资料 ,建立了丘陵赤红壤降雨入渗产流数学模型 ,分析了南亚热带丘陵赤红壤地表径流的动态变化特征及其影响因素。结果表明 ,丘陵赤红壤区 ,4～ 9月每次降雨产生的径流量变化范围为 0 .2～ 5 1.0 4m m,径流率变化范围为 0 .5 6 %～ 47.5 8% ,10月至次年 3月一般不产生地表径流 ;地表径流量与降雨量拟合关系式为 R0 =0 .0 2 5 9.Pn1 .40 34 ,径流率与土壤表层初始含水量拟合关系式为 R′0 =9.8788W7.770 2 ,而降雨强度对径流量的影响要比降雨量、土壤表层初始含水量小得多。

Mathematical Model and Dynamic Characteristic of Rainfall-i nfiltration-runoff of Latored Soils in Hills

Based on the analyses about the characteristics ofrainfall-infiltrati on-runoff of latored soil in hills of subtropics areas of south China，and on field measurement data，the mathematical model of rainfall-infiltration-runof f of latored soil in hills was made，and the dynamic characteristic of runoff an d its influencing factors of latored soil in hills of subtropics areas of south china. The results showed，in latored soil area in hills，in April to September ，the any runoff amount changed in the range of 0.2～51.04 mm，the any runoff ra te changed in the range of 0.56%～47.58%. There was no runoff amount in Octo be r to Mach of next year. The relationship between the runoff amount and rainfall amount was：R0＝0.0259.Pn1.4034，and the relationship between the runoff rate and initial soil water content in surface layer was：R′0=9.87 88W7.7702.