北洛河上游水沙变化及影响因素分析

Analysis of the Variations of Water and Sediment and the Impact Factors in the Upstream of Beiluo River

以北洛河上游刘家河水文站1959—2006年的水文观测数据为依据,应用Mann-Kendall非参数检验法和逐步回归分析法,对刘家河站以上区域的水沙变化及影响因素进行了分析。结果表明:①刘家河以上流域降水量、径流量、输沙量的年内分配不均、年际变化大,1959—2006年均呈下降趋势,且在20世纪80年代初均发生了突变;②降水量是引起1959—1979年水、沙变化的根本原因;③1980—2006年间,径流量主要受降水量的影响,而输沙量受人类活动的影响较大。

Based on 1959--2006 years hydrological observation data of Liujiahe Hydrometric Station in the upstream of Beiluo River, this paper an- alyzed the variations and influencing factors of water and sediment of the region above Liujiahe Station. Mann-Kendall nonparametric test method and stepwise regression analysis were used in this article. The results indicate that ： 1 ） Precipitation, runoff and sediment of the basin above Liujia- he river distribute unevenly during the year and have significant interannual variability and tend to decrease over time. All has mutated in the early 1980s ; 2 ） Precipitation is the fundamental reason of the variations of water and sediment during the period of 1959--1979 ; 3 ） During the period of 1980--2006, runoff is mainly affected by precipitation while the amount of sediment is largely influenced by human activities.