摘要
北峪河流域属于典型的干旱型小流域,为了更加准确地区分降水量和下垫面对流域径流量的影响程度,本文在收集流域下游马街水文站实测水文资料的基础上,采用GIS软件对流域内平均雨量做了计算。采用线性回归法、时序累积值法、M-K检验法对降水量、径流量的变化趋势及突变点进行识别,以序列突变点以前序列为基准期,采用斜率变化率法对降水量和下垫面对径流量的影响贡献率进行计算。结果表明:降水量、径流量整体上呈逐年递减趋势,径流量减小趋势较降水量显著。径流量在1997年后较平稳,长期处于枯水期。
Beiyu River Basin is a typical small arid watershed. In order to distinguish more accurately the influence of precipitation and the underlying surface on the runoff of the basin,this paper calculates the average rainfall in the basin by GIS software on the basis of the measured hydrological data collected from Majie Hydrological Station in the lower reaches of the basin. The linear regression method,sequential cumulative value method and M-K test method are used to identify the change trend and abrupt change point of precipitation and runoff. Taking the sequence before the abrupt change point as the base period,the slope change rate method is used to calculate the impact contribution rate of precipitation and underlying surface on the runoff. The results show that precipitation and runoff are decreasing year by year on the whole,and runoff is decreasing more significantly than precipitation. The runoff has been stable since 1997 and has been in dry season for a long time.
作者
杨亚军
YANG Yajun(Gansu Longnan Hydrological Station,Chengxian 742500,China)
出处
《水利建设与管理》
2022年第11期62-66,82,共6页
Water Conservancy Construction and Management
关键词
降水
北峪河
径流
影响量
precipitation
Beiyu River
runoff
impact amount
