摘要
根据安溪官桥径流小区实测资料，确定了不同利用坡地临界产流降雨标准。结果表明，植被较好的林果茶坡地很少有地表径流产生。以这类坡地为主的流域，坡地地表直接补给河流的比例很小，壤中流（表层流）和地下水流可能在造峰过程中起决定性作用；而在自然裸地，坡地地表直接补给河流的径流比例可达７０％，地表快速汇流是造峰主导因素。坡地产流期内降雨损失率随产期内降雨平均强度的增大而增加，两者呈幂函数关系：ｆ＝ａｉ￣ｂ，从Ⅰ类→Ⅱ类→Ⅲ类→Ⅳ类坡地，ａ，ｂ值减小；坡地土壤入渗特征曲线呈ｆ＝ａｅ￣（－ｂｔ）关系。
Based on the measured data obtained from Anxi,the Curves of the oritical runoff pre-cipitation have been established on various slopes. The results show that the coefficient of surfacerunoff is below 5% and subsurface and underground flow would be dominant factor to make theflood on the slopes with good vegetation cover,and on the undisturbed bare slopes the coefficientis over 45% and the surface flow would be determinant to form the flood.The relationship be-tween the precipitation loss and intensity f=ai￣b have been set up on various slopes,and thecurves of infiltration process f=ae￣(-bt) also have been simulated on the basis of analysing to theprocess ourves of precipitation and runoff.It is point that a would be main influented by precipita-tion intensity and the advanced rainfall,and b would be determined by advanced rainfall.
基金
福建省自然基金
