水资源与水工程学报2016，Vol.27Issue(6)：232-238,7.DOI:10.11705/j.issn.1672-643X.2016.06.42
近30年内蒙古入湖流域干旱特征时空变化分析
Spatio-temporal variability of drought characteristics in the entering lake watershed in Inner Mongolia during the past 30 years
摘要
Abstract
Knowledge of the spatio -temporal variability of drought characteristics in the entering lake watershed is crucial for water regulation and ecological environment improvement of downstream freshwa-ter lake in the upper and middle Yellow River. In this study, daily precipitation data collected at 23 sta-tions in the eastern watersheds of Wuliangsuhai Lake from 1986 to 2015 were used to analyze the drought characteristics and its variation trends during past 30 years which were described by drought duration and drought severity in terms of Standardized Precipitation Index ( SPI ) after pre-whitening treatments u-sing the Mann-Kendall test. The results showed that, the precipitation in the mountain area was larger than that in the plain area. The variations of drought duration and drought severity over time were both non-significant, but the drought in the northern and southeastern watershed increased continuously. The short time-scale meteorological drought mainly occured in the central and southeastern parts of water-shed , while the medium and the long time-scale hydrological droughts primarily occurred in the northern parts of watershed. Under the condition of slight decrease in precipitation of Wuliangsuhai Lake, the dis-charge from watershed to lake presented obvious decreasing trend with the influences of the human activi-ties such as hydraulic engineering construction in the eastern watershed. In order to improve lake water quality and control the yellow algae growth, the water supplement from the Yellow River during ice flood season and irrigation clearance period are required to increase in order. Therefore, the balance between the diversion water from Yellow River and the discharge from eastern watershed and reasonable regulation will provide new ideas for the regional lake environment improvement from both the quantitative and qual-itative respects.关键词
标准化降水指数/干旱历时/干旱严重度/Mann-Kendall法/乌梁素海东部流域Key words
standardized precipitation index/drought duration/drought severity/Mann-Kendall test/eastern watersheds of Lake Wuliangsuhai分类
资源环境引用本文复制引用
张宇瑾,于瑞宏,张笑欣,陈奇,李凌宇,郝艳玲..近30年内蒙古入湖流域干旱特征时空变化分析[J].水资源与水工程学报,2016,27(6):232-238,7.基金项目
国家自然科学基金项目(51469018、61461034) （51469018、61461034）
水利部公益性行业科研专项(20150104) （20150104）
内蒙古科技厅科技引导项目(20140707) （20140707）
内蒙古自然科学基金项目(2014MS0403) （2014MS0403）
内蒙古科技厅应用研发项目(20130428) （20130428）
