北京西山灌木林小流域暴雨径流研究

Study on Storm Runoff in Small Scrub Watersheds on Xishan Mountain in Beijing

利用北京西山次生灌木林地上６个小流域的实测降雨径流数据，采用ＩＵＨ法，分析影响径流的主要因子，并对降雨径流进行预测，结果表明：ＩＵＨ法在小流域上应用效果较好，对径流过程的拟合较为一致；天然次生灌木林具有良好的水源涵养功能，在森林植被覆盖率超过４０％时，每增加１０％，ＩＵＨ洪峰可降低４．６％，洪峰滞时可延长９．３％。

Making use of the actual runoff datum of 6 watersheds with vegetations ofnatural secondary shrubbery forest,IUH method was adopted to analyze the major factorswhich are influencing the amount of runoff in the Xishan Mountain, Beijing.And a predic-tion of the amount of runoff was made.The results showed that :IUH method can well beapplied for small watershed;the natual secondary shrubbery forest posesses fine water sup-ply capacity.When the forest coverage is above 40%,each 10%increase can decrease 4.6%of IUH high discharge,and prolong 9.3%of high discharge time.