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一、桂林市九岗岭防洪应急子堤建设的背景广西桂林市地处亚热带季风气候区,年平均降雨量1949mm,降雨量年内分布不均,每年3～8月降雨量占全年降雨量的75%以上,其中4～6月占全年降雨量50%以上。洪水特点为来势猛,历时短,一般情况,洪水持续2～3d即迅速退去。针对桂林市洪水的这一?
I. Background of Jiugangling flood control emergency embankment construction in Guilin City Guilin, Guangxi Province is located in the subtropical monsoon climate zone with an annual average rainfall of 1949mm. The rainfall is unevenly distributed throughout the year, and the annual rainfall from March to August accounts for 75% of annual rainfall. %, Of which 4 to June accounted for more than 50% of the annual rainfall. The characteristics of floods are fierce, lasted a short time, under normal circumstances, the flood continued for 2 ~ 3d quickly receded. For this flood of Guilin?