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长江水灾发生在什么地区

更新时间: 2020-11-18 00:00:00     

长江水灾发生在荆江段。荆江段是长江流域的抗洪重点地区该区河道弯曲,行洪能力差,洪峰流量大,持续时间长,堤防防洪标准很低。洪灾频繁的原因:一是长江上游的洪水来量大于荆江河段的安全泄量。二是泥沙长期不断的淤积和人类围垦开发活动的影响,导致洞庭湖蓄纳洪水的面积容积日益减少,调蓄长江和湖南湘、资、沅、澧四水的功能减退,迫使江湖水位不断抬高。三是荆南四口向洞庭湖分流量减少,荆江干流的流量必然加大。

关键词: 长江 水灾 发生 什么 地区

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