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2007年7月18～20日,临沧市出现了大范围的暴雨、大暴雨,强降水过程致使全市主要河流发生了不同程度的大洪水,其中南汀河中下游发生50 a一遇洪水;罗闸河发生有水文记录50 a以来的第1大洪水;南碧河发生有水文记录48 a以来第2大洪水;其它河流也相继发生接近30 a一遇的洪水,给当地造成严重洪涝灾害。对“2007·7”暴雨的成因、时空分布、洪水形成及洪水特性进行分析,并与历史大暴雨洪水情况进行对比,对认识临沧市暴雨洪水特性的变化规律有一定意义。
From July 18 to July 2007, a large area of heavy floods and heavy rainstorms occurred in Lincang City, causing major floods to varying degrees in major rivers in the city, of which 50 a flood occurred in the middle and lower reaches of the Nanning River. The first flood occurred 50 years after the hydrological record occurred in the river; the second flood since the 48th a year occurred in the Nanbi River; another 30-year-long flood occurred successively in other rivers, causing severe flooding to the local area. The analysis of the causes, spatiotemporal distribution, flood formation and flood characteristics of “2007.7” heavy rainfall and the comparison with the history of heavy storm floods have certain significance in understanding the changing laws of storm flood characteristics in Lincang City.