Morphological evolution of Jinshan Trough in Hangzhou Bay (China) from 1960 to 2011
Morphological evolution of Jinshan Trough in Hangzhou Bay (China) from 1960 to 2011
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1960-2011年杭州湾金山海槽形态演化
DOI：
10.1016/j.ecss.2016.11.004
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发表时间：
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期刊：
影响因子：
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通讯作者：
Tinglu Cai
中科院分区：
文献类型：
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作者：
Yifei Liu;Xiaoming Xia;Shenliang Chen;Jianjun Jia;Tinglu Cai
中国杭州湾北岸以东部的金山海槽为起点，形成了一个广泛的潮汐通道系统。本文利用1960 - 2011年51年间的17张系列海图，研究了金山海槽的形态演变。根据地形和年平均体积资料，可以区分出这一时期的三个演化阶段。第一阶段（1960-1987）的特点是槽的延伸；第二阶段（1987-1996年）是一个相对稳定的时期，低谷形态有所调整；第三阶段（1996-2011年）以初期的侵蚀和沉积过程以及随后的缓慢侵蚀过程为特征。利用经验正交函数（EOF）分析了波谷的时空变异性。第一个特征函数表明侵蚀是主要的演化过程，存在与体积变化相似的三个阶段。第二个特征函数主要反映了位于金山人工岬角洪水潮流阴影区的槽西北部的侵蚀和沉积。第三个特征函数主要反映金山人工岬角边坡侵蚀和沉积的年际波动。1996年至1998年间发生了一次特别强烈的侵蚀过程。研究了1960 - 2011年对金山海槽植物形态演化的主要影响因素，并提出了初步结论。连续填海对第一阶段和第二阶段形态演化的影响最为显著。风暴潮对第三阶段开始时的演化有明显的影响。
An extensive system of tidal channels, starting with Jinshan Trough in the east, is located along the north shore of Hangzhou Bay, China. This contribution investigates the morphological evolution of Jinshan Trough by using 17 bathymetric charts from a series covering a period of 51 years from 1960 to 2011. Three stages of evolution during this period are distinguishable based on the morphology and annual mean volume data. The first stage (1960–1987) is characterized by extension of the trough; the second stage (1987–1996) is a relatively stable period with some adjustments in the trough morphology; the third stage (1996–2011) is marked by the processes of erosion and deposition in the beginning of the period and a subsequent slow erosion process. Spatio-temporal variability of the trough was evaluated by using empirical orthogonal function (EOF) analysis. The first eigenfunction indicates that erosion is the main evolution process and there exists three stages similar to those distinguished from volume variations. The second eigenfunction mainly reflects erosion and deposition in the northwest part of the trough located in the flood tidal current shadow area of the artificial headland in Jinshan. The third eigenfunction mainly reflects annual fluctuations of erosion and deposition in the side slope at the artificial headland in Jinshan. A particularly intense erosion process occurred between 1996 and 1998. The major effects on morphological evolution in Jinshan Trough from 1960 to 2011 were investigated and tentative conclusions were presented. Continuous coastal reclamations in Jinshan had the most pronounced effect on the morphological evolution during the first and the second stages. The storm surge had a pronounced effect on the evolution at the beginning of the third stage.