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首页> 外文期刊>Estuarine Coastal and Shelf Science >Seasonal variations of transport time of freshwater exchanges between Changjiang Estuary and its adjacent regions
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Seasonal variations of transport time of freshwater exchanges between Changjiang Estuary and its adjacent regions

机译：长江口及其邻近地区淡水交换运输时间的季节性变化

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摘要

Seasonal variations of transport time of freshwater between the Changjiang Estuary (CJE) and its adjacent regions, Hangzhou Bay (HZB) and Jiangsu Coast (JSC), are investigated. The freshwater exchange between the CJE and HZB is controlled by the strength of the secondary plume, which initiates from the South Passage of the southernmost waterway of CJE. The transport time varies seasonally and is modulated by spring-neap tides. The water exchange between CJE and HZB exhibits a high spatial variation. A large water age is observed in the region near the southern coast of the HZB, which corresponds to high pollutant deposition and low water quality conditions observed in the field. A large exchange occurs in summer between CJE and HZB. The freshwater transported into the HZB is accumulated in the deep channel near the western shoreline of the HZB and weak horizontal exchange occurs in the southern region near the southern shoreline, resulting in an increase of water age in the southern region. Due to the increase of northerly and northwesterly winds in winter and fall, more horizontal exchange occurs, resulting in a decrease of water age. The transport time from Xuliujing to the Hangzhou Bay ranges from 30 to 60 days near Jinshanwei, and ranges from 100 to 140 days in the southern region. The advective transport is the dominant transport mechanism to move water out of the HZB, while shear-induced exchange flow transports freshwater into the HZB. Net flux is out of HZB in winter and fall, but into the HZB in summer when Changjiang discharge is high. A weak transport of freshwater between the CJE and Subei Coast exists. A portion of a freshwater plume transports freshwater northward during summer and fall. It takes approximately 60-140 days for the freshwater from Xuliujing to be transported to the Subei Coast. (C) 2015 Published by Elsevier Ltd.
机译：研究了长江口（CJE）与邻近地区杭州湾（HZB）和江苏沿岸（JSC）之间淡水运输时间的季节性变化。 CJE和HZB之间的淡水交换受次羽的强度控制，次羽的强度始于CJE最南端水道的南通道。运输时间随季节变化，并受春季潮汐影响。 CJE和HZB之间的水交换表现出很大的空间变化。在HZB南海岸附近地区观察到较大的水龄，这对应于现场观察到的高污染物沉积和低水质条件。夏季，CJE和HZB之间会发生大量交换。运入HZB的淡水积聚在HZB西岸线附近的深水槽中，并且在南岸线附近的南部地区发生了较弱的水平交换，导致南部地区的水龄增加。由于冬季和秋季的北风和西北风的增加，发生了更多的水平交换，导致水龄降低。从徐六井到杭州湾的运输时间在金山尾附近为30至60天，在南部地区为100至140天。平流运输是将水运出HZB的主要运输机制，而剪切诱导的交换流将淡水运入HZB。净流量在冬季和秋季从HZB流出，但在长江流量高的夏季流入HZB。 CJE和苏北海岸之间的淡水运输较弱。在夏季和秋季，一部分淡水羽流将淡水向北输送。来自徐六井的淡水被运送到苏北海岸大约需要60-140天。 （C）2015年由Elsevier Ltd.出版

著录项

  • 来源
    《Estuarine Coastal and Shelf Science》 |2015年第5期|109-119|共11页
  • 作者

    Wang Ya; Shen Jian; He Qing; Zhu Lei; Zhang Dai;

  • 作者单位

    E China Normal Univ, State Key Lab Estuarine & Coastal Res, Shanghai 200062, Peoples R China|Coll William & Mary, Virginia Inst Marine Sci, Gloucester Point, VA 23062 USA;

    Coll William & Mary, Virginia Inst Marine Sci, Gloucester Point, VA 23062 USA;

    E China Normal Univ, State Key Lab Estuarine & Coastal Res, Shanghai 200062, Peoples R China;

    E China Normal Univ, State Key Lab Estuarine & Coastal Res, Shanghai 200062, Peoples R China;

    E China Normal Univ, State Key Lab Estuarine & Coastal Res, Shanghai 200062, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    transport processes; stratification; residence time; Changjiang; Hangzhou Bay; estuarine circulation;

    机译：运输过程;分层;停留时间;长江;杭州湾;河口环流;

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