水科学进展Issue(2)：187-195,9.DOI:10�14042/j�cnki�32�1309�2015�02�005
植被分布对小流域产流影响的数值实验
Effects of the distribution of vegetation on small catchment runoff during rainstorm events
摘要
Abstract
The distribution of vegetation in small catchments is an essential factor determining the generation of runoff during rainstorm events. Using a novel two⁃dimensional dynamic runoff model, we studied the influence of the distribu⁃tion of vegetation on rainstorm runoff. First, a kinematic hydrological model of rainstorm events in small watersheds was developed based on a two⁃dimensional overland flow model. It included canopy interception, surface infiltration, overland flow, and gully flow processes. Data from three rainstorm events in the Heicaohe catchment were then used to verify the model, and good agreement was found. Last, the model was used to examine how the distribution of vegeta⁃tion and the canopy density affected the runoff process. Model results showed that: First, the vegetation significantly reduces flood discharge and postpones the flood peak, depending on the location and crown density of the vegetation. Second, the efficiency of runoff reduction is substantially higher in downstream and steeply sloped areas ( vs. upstream and gently sloping areas) , and the degree of crown closure enhances this effect. In fact, in this study, the efficiency of runoff reduction was three times higher in downstream compared with upstream areas, and 30%crown closure resul⁃ted in 1�4 times higher efficiency than 20% closure and three times higher than 10% closure.关键词
小流域/降雨产流/动力学模型/植被分布/郁闭度/减水效果Key words
small catchment/runoff/kinematic model/vegetation distribution/crown closure/runoff reduction effi-ciency分类
天文与地球科学引用本文复制引用
李妍敏,安翼,刘青泉..植被分布对小流域产流影响的数值实验[J].水科学进展,2015,(2):187-195,9.基金项目
国家自然科学基金资助项目（11202216；11432015） The study is financially supported by the National Natural Science Foundation of China （ No?11202216；No?11432015）? （）
