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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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2001-2010年鄱阳湖采砂规模及其水文泥沙效应
DOI: 10.11821/dlxb201505014, PP. 837-845
Keywords: 采砂,水文效应,泥沙效应,鄱阳湖
Abstract:
在长江主河道采砂行为于2000年全面禁止之后,受中国长江中下游房产建筑行业的砂石需求的驱动,大量采砂船转移到鄱阳湖采砂,这种规模化的采砂行为对鄱阳湖的水文环境产生的影响还缺乏定量研究。本研究通过利用地形数据、水文数据和卫星遥感数据,分析了鄱阳湖2001-2010年的采砂场的空间分布和采砂量,定量分析了采砂行为对鄱阳湖水文和泥沙的影响。研究结果表明①2001-2007年鄱阳湖采砂船主要集中于松门山以北的通江河道,2007年以后采砂行为扩张到鄱阳湖中部;②2001-2010年间,鄱阳湖采砂面积范围大约为260.4km2,挖沙平均深度4.95m,采砂量达到1.29×109m3或2154Mt,体积上相当于使鄱阳湖库容增加了6.5%,重量上相当于1955-2010年以来鄱阳湖自然沉积量的6.5倍;③鄱阳湖采砂通过扩大通江河道的过水断面面积,加快了湖水注入长江速率,是引起近年来鄱阳湖秋冬季枯水期提前、枯水期延长的主要原因之一;④鄱阳湖采砂过程中通过挖沙、洗沙使沙场附近的水体含沙量增加、水体透明度降低,从而影响长江河道的泥沙平衡。
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