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长江防洪
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长江防洪
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〔主要江河防洪〕
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flood control of Changjiang River
长江防洪
长江属雨洪河流,流域面积180.7万平方千米,年均降雨量1100毫米,除金沙江中上段,雅砻江和岷江的上游基本无暴雨外,其余145万平方千米均有暴雨出现。四川盆地西部、川东大巴山区、大别山区、湘西—鄂西山地以及江西九岭山地至安徽黄山一带是长江流域的主要暴雨区,最大一次暴雨覆盖面积曾达21.3万平方千米(1954年6月25日)。流域内暴雨强度大,主要发生在4~10月,洪水峰高量大。
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