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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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大量采沙对东江下游及东江三角洲河床地形和潮汐动力的影响
DOI: 10.11821/xb200609010, PP. 985-994
Keywords: 东江,采沙,潮汐,变化
Abstract:
通过分析东江下游及东江三角洲的采沙情况、采沙对河床演变和潮汐动力的影响。近几十年来东江下游及东江三角洲采沙量巨大,1980~2002年22年间采沙总量达到了3.32亿m3。大量采沙对河床演变的主要影响是大幅度扩大了河槽容积、河床平均高程显著降低、水深明显增加、纵比降减小。东江下游及东江三角洲潮汐动力的变化主要表现在网河区上段及东江下游潮水位明显降低,潮差增大,涨潮历时延长,主要分潮振幅加大;潮汐传播速度加快;潮区界、潮流界、咸潮界上移;网河区上段及东江下游潮汐动力得到明显增强,潮汐动力作用范围向上延伸,导致这种变化的主要原因是大量挖沙所导致的河床剧烈变化。
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