中文摘要：

选取我国南方湿润地区——湖北省漳河灌区桥河流域作为研究对象,并根据1966—2010年土地利用的变化划分为4个阶段.将SCS模型改进后应用于流域的产汇流计算,并分析该流域不同阶段的降雨-径流关系和洪峰流量变化.分析结果表明,在相同频率下,年径流量和洪峰流量随着时间的推移有减少的趋势.这说明了土地利用的变化对流域水文特性具有一定的影响,也说明了加强人类活动影响研究的重要性.

英文摘要：

Taking the Qiaohe basin in Zhanghe Irrigation System of Hubei province,a humid region in southern China,as study subject,the historical data in 1966-2010 are divided into four stages according to the land-use changes.SCS model is improved by resetting the initial deficit Ia,the division grades of soil moisture,and the parameters for runoff routing formula in accordance with the watershed actual conditions.The improved SCS model is applied to the runoff calculation in different stages for different initial soil moisture conditions;and analyses of rainfall-runoff relationship and changes in peak discharge at different stages.The results show that the annual runoff and peak discharge decrease over time for the water year with the same frequency,which means that changes in land use have definite impact on hydrological characteristics.The study indicates the importance of strengthening the research on the impacts of human activity.