水土保持通报2017，Vol.37Issue(2)：57-64,74,9.DOI:10.13961/j.cnki.stbctb.2017.02.009
近50年来甘肃省河西中部地区径流变化特征及驱动因素
Variation Characteristics of Runoff and Its Driving Forces in Recent 50 Years in Middle Hexi Corridor of Gansu Province
摘要
Abstract
[Objective] The variation characteristics of runoff and its driving factors in the past 50 years in the middle area of Hexi corridor in Gansu Province were analyzed to provide a scientific basis for the ecological construction and the sustainable development of social economy.[Methods] Based on runoff data in the study area,the characteristics of the inter-annual variability of runoff were reflected with annual extreme value ratio and coefficient of variation,and other statistics methods.[Results] (1) The distribution of the runoff showed an unimodal type in the middle area of Hexi region.The proportion was the highest in summer,and it was the lowest in winter.The runoff mainly was sourced from precipitation.(2) The runoff had a decreasing trend in recent years,and the change of hydrologic characteristic was positively correlated with elevation.The annual average runoff had a reducing trend and then gradually became an increasing trend from the west to the south.(3) The mutation characteristics of the annual runoff was poor consistent in the middle of the Hexi region and inter-annual variability of the annual runoff had a characteristic of multi-scale oscillation.The fluctuation had a quasi-cycle obviously in 8 a and 24 a,and the quasi-cycle in 8 a was more obvious,whereof 13 cycles as "much-less-much-less…" were observed.The runoff reduced after 2010,and might increase in 2018.(4) Runoff was both affected by the increase of temperature and precipitation,while was little affected by human activity.[Conclusion] Runoff is mainly supplied by precipitation in the study area.The changes were smaller in the past nearly 50 years.The annual average runoff had a reducing trend and then gradually became an increasing trend from the west to the south,and had a strongest quasi-cycle obviously in 8 a.Temperature and rainfall are the two main causes of runoff change.关键词
河西中部地区/径流变化/气候变化/水文气象Key words
the middle area of Hexi region/runoff/climate change/hydro-meteorology分类
建筑与水利引用本文复制引用
张立峰,闫浩文,段焕娥,张明旺,杨树文..近50年来甘肃省河西中部地区径流变化特征及驱动因素[J].水土保持通报,2017,37(2):57-64,74,9.基金项目
甘肃省自然科学基金项目“基于GIS和RS的城市土地利用动态演化与模拟研究”(148RJZA028) （148RJZA028）
兰州交通大学青年科学基金项目(2013002) （2013002）
