摘要
利用Mann-Kendall非参数秩次检验法分析了紫荆关流域历年最大洪峰流量、次洪总量和洪水过程线的变化趋势,洪峰和洪量有显著下降趋势,洪水过程线有从尖瘦型向平坦型变化的趋势.探讨了影响洪水过程变化的降雨因素和下垫面因素.降雨量和降雨强度的变化趋势不明显,而下垫面变化明显,由土地利用变化引起的土壤蓄水容量增加、流域平均下渗率增大,故下垫面变化是导致洪水过程线洪峰、洪量和形状变化的主要原因.
Non-parameter Mann-Kendall trend analysis method is used to illustrate the trend of annual maximum flood peak series, flood volume series and hydrographs series. Flood peaks and volumes have a decreasing trend; and hydrographs tend to turn flat. Trend analysis of the main influencing factors of flood are made, too. Rainfall amount and intensity have been decreased, but not obvious. However, underlying surface has changed obviously. Increase of soil moisture storage capacity and mean infiltration capacity resulting from underlying surface variation are the main reasons for change of flood peak, volume and hydrograph shape.
出处
《武汉大学学报（工学版）》
CAS
CSCD
北大核心
2012年第2期166-170,176,共6页
Engineering Journal of Wuhan University
基金
国家自然科学基金项目(编号:50879051)
水利部公益性行业科研专项经费项目(编号:201101060)
关键词
洪水过程
趋势分析
降水
下垫面
flood hydrograph
trend analysis
precipitation
underlying surface
