【作者】 王双银； 朱晓群； 曹红霞；

【Author】 Wang Shuangyin,Zhu Xiaoqun,Cao Hongxia (College of water resources and architectural engineering,Northwest Agriculture and forestry university,Yangling,Shaanxi 712100,China)

【机构】 西北农林科技大学水利与建筑工程学院；

【摘要】 为了解决关中西部4灌区内各行政区和各用水部门之间的用水矛盾,实现水资源的合理调度,有必要对其径流时序变化规律进行研究。本文采用不均匀系数、集中度与集中期对径流的年内分配进行了分析;采用F检验、Mann-Kendall秩次分析和Hurst指数及谱分析等方法对径流的变异点、趋势性和持续性、周期进行了分析。结果表明,各灌区来水量的年内分配极不均匀,多年平均不均匀系数在0.20～0.38、集中度在0.27～0.50,集中期主要集中在7月下旬到8月上旬,且1990～1991年以后集中期普遍提前;除石头河水库年径流的年际变化较小(C_V=0.36,极值比为5.3),其他3个灌区年径流的年际变化均较大(C_V=0.45～0.62,极值比为10.2～13.3);4灌区年径流的显著周期不协调,变异点均出现在1990～1991年,且均存在持续下降的趋势。更多还原

【Abstract】 It is necessary to study the sequential variation of runoff in order to resolve the water-using contradiction among districts and water-using sector and to achieve reasonable dispatch of water resources in four irrigation districts of the west of GUANZHONG.The annual distribution of runoff is analyzed with nonuniformity coefficient,concentration degree and concentration period.The aberrance point,period,tendency and durative of runoff are examined by F-test,Mann-Kendall Examination,Hurst Index and spectrum analysis.The results show annual distribution of inflow in each irrigation districts is extremely uneven.Nonuniformity coefficient of average annual runoff is about 0.20～0.38,concentration degree 0.27～0.50, concentration period from last third of July to first third of August,and concentration period is brought forward after 1990-1991.Except that annual runoff for SHITOUHE reservoir within years has a little variation of(C_V=0.36,ratio of extreme values is 5.3),the others have a large variation(C_V=0.45～0.62,ratio of extreme values is about 10.2～13.3).The significant period of annual runoff for the four irrigation districts is inconsistent.The aberrance points all appear in 1990-1991,and decline consistently.更多还原