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针对降水量的时空分布影响旱涝灾害的防治和水资源的合理利用问题,基于长江流域80个气象站1956~2005年的逐日降水资料,以15 d为时段长度,运用年降水集中度和集中期并结合变差系数和趋势系数,分析了长江流域降水集中程度及其不同时期内的变化趋势。结果表明,50 a来降水量分布呈逐渐均匀的趋势,但1990年以来,降水较为集中,各区段降水叠加的可能性增大,为旱涝灾害的防治提供了参考依据。
Aiming at the prevention and control of droughts and floods and the rational utilization of water resources, the spatial and temporal distribution of precipitation is based on the daily precipitation data of 80 meteorological stations in the Yangtze River Basin from 1956 to 2005, and the annual precipitation concentration and concentration In combination with the variation coefficient and trend coefficient, the precipitation concentration in the Yangtze River Basin and its changing trend in different periods were analyzed. The results show that the distribution of precipitation presents a gradually uniform trend in the past 50 years. However, the precipitation is more concentrated since 1990, and the possibility of superimposition of precipitation in each section increases, which provides a reference for the prevention and control of droughts and floods.