Page 69 - 水利学报2025年第56卷第4期

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Response of river-tide-salt-suspended sediment dynamics to seabed topographic abnormal⁃
ity during dry season in the Lingdingyang Bay

1 2 1 2
ZHONG Ziyue ，XIANG Bo ，YU Minghui ，LIU Shubao

（1. State Key Laboratory of Water Resources Engineering and Management，Wuhan University，Wuhan 430072，China；

2. Power China Beijing Survey，Design and Research Institute Co.，Ltd，Beijing 100024，China）

Abstract：During the period of 1974-2016，due to the impacts of human activities like reclamation projects，channel

dredging projects，and sand mining in the estuary，the shoreline and seabed topography of Lingdingyang Bay
changed abnormally，and the characteristics of the distribution of river-tide-salt-suspended sediment changed accord⁃

ingly. It is necessary to study the characteristics of river-tide-salt-suspended sediment dynamics after topographic

anomalies and the response mechanism of such characteristics to seabed topographic anomalies. Therefore，this study
analyzed the turbidity-salinity data of suspended sediment measured from stations in Lingdingyang Bay during the dry
season of 2016，and established a three-dimensional mathematical model of runoff-tide-salt-suspended sediment

dynamics based on EFDC software to study the changing mechanisms of salinity stratification and vertical distribution
of suspended sediment in the mouth of the Lingdingyang Bay under the drive of anomalous changes of the shoreline
and the topography. The results show that the increased convergence and seaward extension of the shoreline and the
downcutting of the topography lead to a relative enhancement of the tidal dynamics of the Lingdingyang Bay. During

flood tide，the water column salinity and suspended sediment concentration are mixed relatively uniformly in the verti⁃
cal direction. During ebb tide，the water column salinity is stratified significantly，and the buoyancy item accounts

for a larger proportion of the turbulent kinetic energy，which provides energy for the salinity stratification. The turbu⁃

lent mixing is weakened，inhibiting the re-suspension of the bottom sediments and increasing the dispersion coeffi⁃
cient （CV）from 0.51 to 1.02，which characterizes the degree of non-uniformity in the vertical distribution of the sus⁃

pended sediment. During a tidal cycle，CV exhibits a lagged positive correlation with the overall Richardson number
that characterizes stratification. The results of this study revealed the mutual feed-influence relationship between

saline water and suspended sediment transport in the estuary of Lingdingyang Bay during the dry season，and provide
a scientific basis for the management of water and sediment in the Lingdingyang Bay.

Keywords：Lingdingyang Bay；vertical suspended sediment distribution；stratification；estuarine tidal dynamics
（责任编辑：鲁 婧 韩 昆）
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