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地理学报  2009 

三峡水库调度运行初期荆江与洞庭湖区的水文效应

DOI: 10.11821/xb200911006, PP. 1342-1352

Keywords: 三峡水厍运行初期,江湖水沙关系,水文效应,洞庭湖

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Abstract:

以1951-2008年实测水文资料为依据,运用对比方法,分析了三峡水库调度运行初期,荆江与洞庭湖区的连琐水文效应。结果表明①荊江冲刷量占宜昌至城陵矶段的78.9%,其平均冲刷强度也远高于该河段;②三口分流比减少2.33%、分沙比减少2.78%;③三口多年平均入湖径流泥沙比依次减少7.7%及24.4%;④洞庭湖区淤积速率减缓26.7%、汛期水量较同期多年平均值偏少20.2%,使湖区连年季节性缺水,前者对延长湖泊寿命有利,后者酿成了连年性的夏秋连旱灾害、居民饮用水、生产用水和航运等水安全问题以及涉及到了珍禽鸟类数量和种类减少,东方田鼠种群数量极度膨胀等生态系统的稳定性;⑤湖口多年平均输沙泄洪能力增强了26.6%和3.7%,避免了溃垸决堤之灾。并认为,为适应新的江湖关系变化,必须进一步优化调整三峡水库调度运行方案,重新审视江湖治理的理念,维系江湖连通的纽带。

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