四川盆地大洪涝灾害的特点和变化规律及防治对策

四川盆地的大洪涝灾害是由暴雨和大暴雨引起的。具以下6个特点；一次大洪涝灾害发生时，降水强度大，降水量多且集中，灾害严重，损失巨大；发生频率高，大强度灾害多；时空分布不均；开始期主要在6、7月；终期主要在9月，初终期有很好的对应关系。它的强度、初终期等都有变化规律。防治它的对策是治、防、用、护四结合。

FEATURES, LAWS AND COUNTERMEASURES OF LARGE WATER-LOGGING DISASTERS IN SICHUAN BASIN

Large water-logging disaster in Sichuan basin is resulted from rain storms. It has six features, such as high in rainfall intensity, concentrated in precipita-tion, severe in damage and great in loss; high in occurrence frequency and large in num-ber. of high intensity disaster; inhomogeneous spatial and temporal distribution; usually beginning in June or July; ending in September; and good correspondent relation be-tween beginning and ending periods. There are laws of changes in intensity and begin-ning and ending periods. The measure to prevent them is to integrate control, preven-tion, use and protection into one.