摘要
以澜沧江—湄公河流域为例,基于38个气象站1977～2010年降水资料,采用标准化降水指数(SPI)、干旱频率、干旱覆盖范围及干旱重心分析了流域气象干旱时空分布特征。结果表明,干旱强度与覆盖范围随时空分布呈规律性变化,年际变化较大,雨季变化趋势不明显,旱季呈显著下降趋势。该方法计算简单易行、资料易获取、稳定,可用于不同时空的干旱监测与评估。
Based on 1977-2010 precipitation data of 38 weather stations in the Lancang-Mekong River basin, spatial and temporal distribution characteristics of meteorological drought is analyzed by using standardized precipitation index （Sel）, drought frequency, drought occurrence area and drought core position. The results show that the drought intensity and occurrence area changes regularly with spatial and temporal distribution; in wet season, drought intensify and occurrence area changed insignificantly; but in dry season, drought intensity and occurrence area decreases significantly. The simple method can be used for drought monitoring and assessment in different spatial and temporal scales with accessible data.
出处
《水电能源科学》
北大核心
2011年第6期4-7,193,共5页
Water Resources and Power
基金
国家"十一五"科技支撑计划基金资助项目(2007BAB28B01
2008BAB42B03)
国家重点基础研究发展计划(973)基金资助项目(2010CB951102)
国家自然科学基金资助项目(50709042)
关键词
气象干旱
时空分布
标准化降水指数
澜沧江-湄公河流域
meteorological drought
spatial and temporal distribution
standardized precipitation index
Lancang-Mekong River basin
