江西兴国侵蚀荒山森林小流域的降水流出特性分析

THE ANALYSIS OF WATERFLOW PROPERTY FROM PRECIPITATION AT AN ERODED SMALL WATERSHED IN XINGGUO OF JIANGXI PROVINCE

用小流域和量水堰方法6a 多的观测资料,分析了江西兴国一个面积为2.9hm^2的侵蚀荒山森林小流域的降水流出特性。年流量(Q)随年降水量(P)的增多而增加,Q/P 为48.0%～63.7%。P-Q 的差数在737mm～1128mm 之间,大体上是稳定的。由于表面水占流出量的主要部分,因而流量水平的变化极大。观测期间的流量水平最高为93.3mm/h,持续5min,最低为0.01mm/h。月流量与月降水量、日流量与日雨量、以及小时流量与小时雨量之间都基本上是线性关系。

According to observational data in six years through watershed and gauging weir approach,wa- terflow property from precipitation at a eroded small watershed covered an area of 2.9ha was analysed. The vegetation at the small watershed was deteriorated forest.Annual discharge(Q)was more and more with increase in annual precipitaton(P),Q/P was 48.0%～63.7%.The difference of P-Q was 737mm ～1 128mm,and was basically stable.Owing to surface flow made up significant part in the discharge, the variations in discharge level was tremendous,in observational period the maximum of discharge level was 93.3mm/h and continued 5min.,the minimum was 0.01mm/h.The relation of monthly discharge to monthly precipitation,the relation of daily discharge to daily rainfall,and the relation of hourly discharge to hourly rainfall were all basically linear.