森林植被变化对洪水的影响分析——以长江上游典型小流域和洪水事件为例

An Analysis of Affection of Forest Vegetation Change on Flood——Take Typical Small Watersheds and History Flood Event in the Upper Reaches of the Yangtze River as Examples

通过长江上游地区典型小流域和重大洪水事件有关森林植被变化与洪水方面资料的分析 ,揭示小流域森林面积的增加 ,可减少洪峰流量模数 ,而在森林 -土壤系统被前期降雨充分润湿的情况下 ,紧接着的暴雨可引起洪峰流量的快速增加 ;指出开展长江上游地区森林 -土壤系统截留蓄水容量本底调查及其分类与分区 。

An affection of forest vegetation change of the typical small watersheds on floods and forest vegetation change on history flood event in the upper reaches of the Yangtze River has been analyed. It is found that increase of forestt area at the small watersheds can reduce discharge modulus of flood peak, and continnous storm rainfall can cause fast increse discharge of flood peak after the forest soil system was weted by the rainfall before. Investigation, classification and division of background values of contents of intercept and storage rainfall of the forest soil systems in the upper reaches of the Yangtze River have very important significance for guiding works of restoration and onhancement of forest vegetation and prevention flood.