干旱指数在辽河流域的应用分析
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摘要
由于农业用水增加、工业污染严重,造成辽河流域干旱程度加重,利用2010—2015年辽河流域昌图县、康平县、法库县逐月降水量资料及年降雨量数据,通过降水距平百分率、标准化降水指数(SPI)、降水Z指数合理评价了辽河流域干旱情况,并比较3种干旱指数的评价效果。分析了三个地方的干旱情况,研究并比较了降水距平百分率、SPI、降水Z指数的评价效果。结果表明:降水距平百分率反映干旱程度较轻;与降水Z指数相比,SPI指数能较客观地反映辽河流域干旱程度。为辽河流域定量研究干旱事件提供合理的指标依据,为不同研究区根据自身特点选择适合的干旱指标奠定理论基础。
Due to the increasing agricultural water and heavy industrial pollution,the drought degree in Liaohe Basin is aggravating.According to the monthly precipitation data and annual rainfall data of Changtu County,Kangping County,and Faku County nearby Liaohe Basin,reasonable evaluation of the drought condition is made via studying the precipitation from flat percentage,the standardized precipitation index(SPI),as well as the Z index of precipitation.The drought conditions in the above three places were analyzed,and the effect of precipitation anomaly percentage,SPI and precipitation Z index were also studied and compared.The results show that the percentage of precipitation reflects the degree of drought to a lesser degree.Moreover,compared with Z index,SPI index can objectively reflect the degree of drought in Liaohe basin.This study provides a reasonable basis for the quantitative study of drought events in Liaohe basin,and lays a theoretical foundation for selecting suitable drought indicators according to their own characteristics.
Due to the increasing agricultural water and heavy industrial pollution,the drought degree in Liaohe Basin is aggravating.According to the monthly precipitation data and annual rainfall data of Changtu County,Kangping County,and Faku County nearby Liaohe Basin,reasonable evaluation of the drought condition is made via studying the precipitation from flat percentage,the standardized precipitation index(SPI),as well as the Z index of precipitation.The drought conditions in the above three places were analyzed,and the effect of precipitation anomaly percentage,SPI and precipitation Z index were also studied and compared.The results show that the percentage of precipitation reflects the degree of drought to a lesser degree.Moreover,compared with Z index,SPI index can objectively reflect the degree of drought in Liaohe basin.This study provides a reasonable basis for the quantitative study of drought events in Liaohe basin,and lays a theoretical foundation for selecting suitable drought indicators according to their own characteristics.
引文
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[2]杨玲,杨艳昭.基于TVDI的西辽河流域土壤湿度时空格局及其影响因素[J].干旱区资源与环境,2016,02:76-81.
[3]闫百兴,宋新山,闫敏华,邓伟,严登华.辽河流域水资源演化趋势分析[J].水土保持通报,2000,06:1-5.
[4]赵一磊,任福民,李栋梁,刘建永.基于有效降水干旱指数的改进研究[J].气象,2013,05:600-607.
[5]马海娇,严登华,翁白莎,方宏阳,史晓亮.典型干旱指数在滦河流域的适用性评价[J].干旱区研究,2013,04:728-734.
[6]王劲松,李忆平,任余龙,柳媛普.多种干旱监测指标在黄河流域应用的比较[J].自然资源学报,2013,08:1337-1349.
[7]杨世刚,杨德保,赵桂香,付亚平,武捷.三种干旱指数在山西省干旱分析中的比较[J].高原气象,2011,05:1406-1414.
[8]师战伟.基于水文模型的大凌河流域综合干旱指数研究[J].水利规划与设计,2016,04:48-51.
[9]王春林,郭晶,薛丽芳,丁丽佳.改进的综合气象干旱指数CI_(new)及其适用性分析[J].中国农业气象,2011,04:621-626+631.