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陈勇,何中发,黎兵,杨丽君,张金华.长江河口拦门沙河段滩涂演化特征及驱动机制[J].海洋学报,2015,37(9):95-105
长江河口拦门沙河段滩涂演化特征及驱动机制
Evolution of tidal flat in the bar area of the Yangtze Estuary and their driving factors
投稿时间:2014-06-19  修订日期:2015-01-16
DOI:
中文关键词:  滩涂资源  重大工程  减沙  长江河口  上海
英文关键词:tidal flat resources  engineering works in the estuary  sediment decrease  Yangtze Estuary  Shanghai
基金项目:国土资源部公益性行业科研专项(201211009)。
作者单位
陈勇 上海市地质调查研究院, 上海 200072 
何中发 上海市地质调查研究院, 上海 200072 
黎兵 上海市地质调查研究院, 上海 200072 
杨丽君 上海市地质调查研究院, 上海 200072 
张金华 上海市地质调查研究院, 上海 200072 
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中文摘要:
      利用长江河口实测1958-2013年水下地形数据,基于ArcGIS技术和DSAS软件分析了拦门沙河段滩涂演化特征,在此基础上结合河口重大工程建设、流域来沙状态对滩涂资源的变化机制进行分析。研究结果表明:(1)1958-2013年,长江河口滩涂资源总量略有下降,但最近十年趋于稳定,维持在2 350 km2左右。(2)长江河口潮滩-5 m等深线以下已经出现侵蚀,垂向侵蚀速率为达7.3 cm/a;(3)近10多年流域来沙剧烈下降对潮下带0~-5 m区域的滩涂资源淤涨产生了显著负面影响,而河口重大工程建设则是近年来0 m以上滩涂逆势增长的主要驱动因素。
英文摘要:
      Bathymetric data surveyed from 1958 to 2013 were analyzed using ArcGIS and DSAS software to investigate the evolution of the tidal flats in the bar area of the Yangtze Estuary. And driving factors such as the declined riverine sediment supply and the major engineering works constructed in the Yangtze Estuary were discussed in this study. The results demonstrated that: (1) the amount of tidal flat resources has experienced slight decrease since 1958; but it comes to be stable, with amount of 2 350 km2 in recent decade. (2) the area deeper than 5 m has begun to experience erosion since 1997, and the averaged vertical erosion rate was 7.3 cm/a. (3) the dramatic sediment decline from Yangtze River in recent decade has brought negative impact on the progradation of the tidal flat deeper than 0 m. Nevertheless, the area shallower than 0 m was continued to accretion due to the influence of the engineering works in the estuary.
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