摘要
降水-径流关系研究是了解流域生态系统水文过程的一个重要途径,分析了典型降雨对嘉陵江上游不同小流域的影响。结果表明:在典型降雨条件下,不同小流域的产流量除受降雨和流域面积的影响外,流域下垫面特征特别是植被因子影响产流的主要原因,植被恢复能有效提高侵蚀性降雨等级,降低大到暴雨的地表径流量;植被因素对较小面积的小流域具有较强的拦截降水的作用,但随着小流域面积的增大和土地利用类型的复杂化,这种作用会逐渐减弱;森林覆盖率高的流域能有效阻缓地表径流,洪峰出现的时间,延长产流历时,表现出明显的产流滞后效应和延长效应。
The relationship of precipitation-runoff is an important way to know the hydrological process of watershed ecosystem.The effect of typical rainfall on different river basin was studied in the upper Jialing River.The results indicated：the runoff of different river basin is not only affect by rainfall and basin area but also the characteristic of underlying surface especially vegetation factor is the main factor.Vegetation restoration can effective strengthen the erosive rainfall and reduce the surface runoff during heavy rain.Vegetation can have a well interception of rainfall in relative small river basin but this effect will gradually weakened while the area of river basin become larger and the complication of the Land-use types.The basin area has high forest coverage can effective slow the runoff,postpone occurred time of peak and extent the runoff duration.It will postpone time of runoff and extent the runoff duration obviously.
出处
《水土保持学报》
CSCD
北大核心
2010年第2期35-39,共5页
Journal of Soil and Water Conservation
基金
国家科技支撑计划项目(2003BA606A
2006BAC01A11)
四川农业大学211工程创新团队项目
关键词
植被类型
小流域
降雨-产流
vegetation type
river basin
rainfall-runoff
