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Salt transport during a dry season in the Modaomen Estuary, Pearl River Delta, China

机译：珠江三角洲磨刀门河口干旱季节的盐分运输

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摘要

Based on the salinity and current data from an intensive field survey carried out in the Modaomen Estuary, Pearl River Delta, China, this study reveals that the behaviors of the two major components of salt transport flux (i.e., the advective salt flux caused by mean advective flow and the tidal salt flux caused by tidal diffusive processes) are quite different at different stations along the estuary during a dry season. During the neap tide, the tidal salt flux and the advective flux are both important in driving a net landward salt transport at a downstream station, and the tidal salt flux is the primary component of landward transport at the station where the salt intrusion limit occurs, whereas the advective salt flux is more important at the station in the mesohaline region and at the estuary mouth. This situation changes during the following meso and spring tides, i.e., the advective salt flux becomes more important than the tidal salt flux. When an enhanced river flow and a strong down-estuary wind both occur at the spring tide, the surface seaward advective salt flux increases significantly, whereas the tidal salt flux is also enhanced, becoming the main contributor to the landward salt transport. The salt transport pattern is of great significance in the regional environmental management for salt intrusion prevention. An optimal freshwater releasing time from the upstream reservoir should be chosen at the spring tide. The implementation of an engineering project to prevent saltwater entering the Modaomen mainstem from the Hongwan Waterway (a branch of the estuary) should be based on a thorough understanding of the local salt transport process.
机译：根据在中国珠江三角洲磨刀门河口进行的一次强力实地调查的盐度和当前数据，本研究揭示了盐分输运通量的两个主要成分（即均流引起的平流盐通量）的行为。在干旱季节，沿河口的不同站点的对流和由潮汐扩散过程引起的潮汐盐通量是完全不同的。在潮汐潮汐期间，潮汐盐通量和对流通量对于驱动下游站的净陆上盐分运输都很重要，潮汐盐分通量是发生盐分侵入极限的站内陆上盐分运输的主要组成部分，而平流盐通量在中卤地区和河口处更重要。这种情况在随后的中观和春季潮汐过程中发生了变化，即平流盐通量比潮汐盐通量更重要。当在春季潮汐同时出现增强的河水流量和强烈的河口风时，地表海向平流盐通量显着增加，而潮汐盐通量也被增强，成为陆上盐分运输的主要因素。盐分的运移模式对于防止盐分入侵的区域环境管理具有重要意义。在春季潮汐时，应选择上游水库的最佳淡水释放时间。实施防止咸水从洪湾水道（河口支流）进入磨刀门主干的工程项目，应基于对当地盐分运输过程的透彻了解。

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  • 来源
    《Ocean & coastal management》 |2014年第11期|139-150|共12页
  • 作者

    Wenping Gong; Jerome P.-Y. Maa; Bo Hong; Jian Shen;

  • 作者单位

    Center for Coastal Ocean Science & Technology Research, School of Marine Sciences, Sun Yat-Sen University, 135 Xingangxi Rd., Guangzhou 510275, China,Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering, China;

    Virginia Institute of Marine Science, The College of William and Mary, 1208 Greate Road, Gloucester Point, VA 23062, USA;

    School of Civil and Transportation Engineering, South China University of Technology, Guangzhou 510640, China;

    Virginia Institute of Marine Science, The College of William and Mary, 1208 Greate Road, Gloucester Point, VA 23062, USA;

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