OALib Journal期刊
ISSN: 2333-9721
费用:99美元
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近50年来长江与鄱阳湖水文相互作用的变化
DOI: 10.11821/xb201105004, PP. 609-618
Keywords: 长江,鄱阳湖,江湖作用,气候,三峡工程运行
Abstract:
通过分析1957-2008年长江与鄱阳湖相互作用的基本特征及其与长江中游、鄱阳湖流域的径流量和气候变化的关系,并用2004-2006年三峡水库蓄水、放水量的数据,定量地计算和比较了三峡水库运行和区域气候变化对长江与鄱阳湖相互作用的影响程度,得出如下主要结论1)从年际、年代际尺度上来看,鄱阳湖流域的气候变化和五河入湖流量是鄱阳湖水位和水量变化的主要因素,同时也在很大程度上决定了长江与鄱阳湖相互作用关系及其强弱变化。2)长江与鄱阳湖的相互作用强度是此消彼长的关系。从季节来看,鄱阳湖对长江的较强作用主要在4-6月,而长江对鄱阳湖的较强作用主要发生在7-9月。3)三峡水库运行并没有改变长江与鄱阳湖作用的基本特征,在多数季节三峡水库的影响不足以解释长江径流量变化的10%,但是水库在不同季节的蓄水或放水在一定程度上影响了江湖作用的季节变化和鄱阳湖流域的旱涝机率。4-6月的放水加强了长江作用,由于此时正值鄱阳湖流域的雨季,增强的长江作用在湿润气候的环境下可能增加初夏鄱阳湖流域发生洪涝的概率;7-9月的少量蓄水则减弱长江对鄱阳湖的作用,降低了湖区洪涝的概率;而10月份三峡水库的大量蓄水可能增加鄱阳湖流域的旱季干旱发生率。
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