营口地区干旱指标的确定

Determination of Drought Index in Yingkou District

采用降水距平百分率、Z指数、K指数和辽宁省干旱指标,根据大石桥和盖州1987~2006年的气象资料,对营口地区干旱指标的确立进行研究。结果表明,辽宁省干旱指标经过修正比较适合评价营口地区的干旱;降水距平百分率准确率也较高,但只对春旱敏感;Z指数对春旱、夏旱、秋旱都不敏感;K指数一致性较低,但对春旱较为敏感。

By using precipitation anomaly percentage,Z index,K index and Liaoning drought index,according to meteorological data of Dashiqiao and Gaizhou during 1987-2006,the determination of drought index in Yingkou Region was studied.The results showed that after modification,Liaoning drought index are appropriate for evaluating drought in Yingkou Region;the accuracy rate of precipitation anomaly percentage is higher,but only sensitive to the spring drought;Z index is not sensitive to spring,summer and autumn;the consistency of K index is lower,but sensitive to the spring drought.