淮河上游地区干旱评价分析

利用淮河上游6个雨量站1964～2000年日降雨资料和邻近气象站气象资料,分别计算各站逐月Palmer干旱指标和雨量距平指标,并对计算结果进行对比分析.结果表明:淮河上游地区旱涝程度具有较强的持续性,夏季干旱多发,不过干旱等级多集中在轻微干旱和中等干旱;秋冬季节则是严重干旱多发的季节;极端干旱多发于春季;相比降雨量较大的淮南地区,淮北地区更为干旱.

Drought Evaluation for Upper Reaches of the Huaihe River

Based on the data of daily precipitation from 1964 to 2000 at six stations in the upper reaches of the Huaihe River and the meteorological data at the neighboring weather stations,the Palmer drought severity index and rainfall anomaly index were calculated,and the results were compared and analyzed.The results show that the durative of droughts and floods grades are rather marked,the occurring frequency of moderate and mild drought is highest in the summer,the occurring frequency of drought is higher in the autumn and winter,and the extreme drought mainly occur in the spring,the north is drier than the south in the upper reaches of the Huaihe river.