Responses of water environment to tidal flat reduction in Xiangshan Bay: Part II locally re-suspended sediment dynamics
Responses of water environment to tidal flat reduction in Xiangshan Bay: Part II locally re-suspended sediment dynamics
复制标题
象山湾水环境对滩涂减少的响应：第二部分局部重悬浮沉积物动力学
DOI：
10.1016/j.ecss.2017.08.042
复制
发表时间：
2017-11
期刊：
影响因子：
--
通讯作者：
Xia Y.
中科院分区：
文献类型：
--
作者：
Li L.;Guan W.;He Z.;Yao Y.;Xia Y.
象山港是我国的一个半封闭海湾，过去几十年来，为了支持当地经济和社会的发展，大量的滩涂被开垦。潮滩的丧失导致了海湾潮汐和局部悬沙的变化。利用潮汐资料驱动的数值模式，并通过实测潮高和潮流进行校准，研究了潮滩缩减对局部悬沙动力学的影响。该模型较好地再现了河口的实测水位、水流和悬沙浓度，并用于分析滩涂围垦对局部悬沙输移的影响。1963 - 2010年，潮滩消失后，由于潮流减弱，外湾/潮滩区底边界层悬浮泥沙浓度（SSC）减少/增加。在内湾，近底层的SSC值在1963年至2003年期间由于水深变窄而增加，然后在2003年至2010年期间由于潮汐棱柱体减少而减少。模拟结果表明：（1）潮滩面积的减少是导致泥沙向河口上游输移的主要因素，主要是由于欧拉流速的增加和潮泵作用的增强;（2）潮滩面积的减少对悬浮物的时空分布产生影响，主要是由于水流的减少导致水域内悬浮物浓度的降低;（3）潮滩减少影响净泥沙通量：减少侵蚀，引起向陆/向海的高/低输沙。
Xiangshan Bay is a semi-enclosed bay in China, in which tidal flats have been substantially reclaimed to support the development of local economies and society over previous decades. The loss of tidal flats has led to changes of tides and locally suspended sediment in the bay. The effects of tidal flat reduction on locally suspended sediment dynamics was investigated using a numerical model forced by tidal data and calibrated by observed tidal elevation and currents. The model satisfactorily reproduces observed water levels, currents, and suspended sediment concentration in the estuary, and therefore is subsequently applied to analyze the impact of tidal flat reclamation on locally suspended sediment transport. After the loss of the tidal flats from 1963 to 2010, the suspended sediment concentrations (SSC) at the bottom boundary layer were reduced/increased in the outer bay/tidal flat areas due to weakened tidal currents. In the inner bay, the SSC values near the bottom level increased from 1963 to 2003 due to the narrowed bathymetry, and then decreased from 2003 to 2010 because of the reduced tidal prism. The model scenarios suggest that: (1) a reduction of tidal flat areas appears to be the main factor for enhancing the transport of sediments up-estuary, due to the increased Eulerian velocity and tidal pumping; (2) A reduction of tidal flat areas impacts on spatial and temporal SSC distribution: reducing the SSC values in the water areas due to the reduced current; and (3) a tidal flat reduction influences the net sediment fluxes: lessening the erosion and inducing higher/lower landward/seaward sediment transportation.
登录
查看更多内容
影响因子：
2.3
作者：
S. Martyanov;V. Ryabchenko
通讯作者：
S. Martyanov;V. Ryabchenko
2009年旱季中国长江口深水航道的悬浮泥沙输送：2.数值模拟
影响因子：
--
作者：
Dehai Song;Xiao Hua Wang
通讯作者：
Xiao Hua Wang
影响因子：
2.2
作者：
J. Beckers;M. Rixen
通讯作者：
J. Beckers;M. Rixen
DOI：
10.1016/j.jcp.2010.06.031
发表时间：
2010-09
期刊：
J. Comput. Phys.
影响因子：
--
作者：
K. Ghosh;S. Menon
通讯作者：
K. Ghosh;S. Menon
影响因子：
12.8
作者：
Jeoung gyu Lee;W. Nishijima;T. Mukai;K. Takimoto;Tohru Seiki;K. Hiraoka;M. Okada
通讯作者：
Jeoung gyu Lee;W. Nishijima;T. Mukai;K. Takimoto;Tohru Seiki;K. Hiraoka;M. Okada