气候变暖背景下贺州地区水资源的变化特征

摘要

利用贺州站1957—2011年月平均气温及月降水资料，分析了气候变暖背景下该地区55a来的降水以及水资源的季节、年际和年代际变化。研究表明：在气候变暖的背景下，贺州地区年降水量有增加趋势，年蒸发量呈下降趋势，相应的可利用降水呈增加趋势，但趋势均不明显。该地区的水资源在各季节的分配极不均匀，春季和初夏是最易发生洪涝灾害的季节，秋季是最易发生干旱的季节，同时还可能发生夏秋冬连旱的现象。%Using the monthly mean temperature and monthly precipitation data of Hezhou station, the seasonal, interannual and interdecadal variation of water resources were analyzed under climate warming. The results show that the annual precipitation (Annual evaporation, Available precipitation) has a slight increasing (decreasing, increasing) trend. The distribution of water resources in each season was very uneven. It is vulnerable to floods (drought, prolonged drought) in spring and early summer (autumn, from summer to winter) .