Numerical Study on the Initial Formation of the Radial Sand Ridges

2014 ◽  
Vol 641-642 ◽  
pp. 222-225
Author(s):  
Sheng Song Zhang ◽  
Yu Li ◽  
Cao Hu
Keyword(s):  
Numerical Model ◽  
Tidal Current ◽  
Numerical Study ◽  
Current Field ◽  
Maintenance Mechanism ◽  
The Southern Yellow Sea ◽  
Sand Ridges ◽  
Radial Sand Ridges ◽  
Long Time ◽  
Formation And Evolution

The radial sand ridges located in the southern Yellow Sea off the Jiangsu coast, are unique sand ridges. They are characterized by radical current field and radical arrangement. The formation and maintenance mechanism of the radial sand ridges have always been a focus of attention of scholars for a long time. The formation is related to the unique convergent-divergent tidal currents. In this paper, a numerical model is constructed to answer the two following questions. Firstly, can the radial sand ridges be formed with radical tidal current field? Secondly, can this be simulated by a numerical model? The radial tidal current can shape the radial sand ridges. Numerical simulations show that the radial sand ridges can be formed on present radical tidal current field and the formation and evolution of the radial sand ridges can be simulated by a numerical model.

scholarly journals A Study on the Response of the Hydrodynamic Environment to the Morphology of Radial Sand Ridges in the Coastal Waters of Jiangsu

Water ◽  
2019 ◽  
Vol 11 (10) ◽  
pp. 2190
Author(s):  
Changjun Qi ◽  
Lejun Ma ◽  
Qinggai Wang ◽  
Yuan Zhai ◽  
Jixuan Li ◽  
...  
Keyword(s):  
Tidal Current ◽  
Unstructured Grid ◽  
Tidal Currents ◽  
Current Data ◽  
Material Transport ◽  
Current Field ◽  
Sand Ridges ◽  
Radial Sand Ridges ◽  
Local Current ◽  
Hydrodynamic Environment

A two-dimensional hydrodynamic model for the waters off the coast of Jiangsu, where there are radial sand ridges (RSRs) (hereinafter, the RSR area), was established based on measured topographic, tide level and tidal current data. Considering the complex topographic and geomorphic characteristics of the RSR group in this area, an unstructured grid was used for the calculation. A four-layer refinement was applied to the grid from outside to inside to better fit the complex topography. The simulations were performed to examine the response of the hydrodynamic environment to the morphology of the RSRs in three scenarios, namely, when there are natural RSRs, no RSRs, and partially reclaimed RSRs. When there are no or partially reclaimed RSRs, the tidal current field still exists in a radial pattern in the RSR area. The radial tidal current field is relatively stable and is not controlled by the morphologies of the RSRs. The topographic changes do not alter the distribution pattern of the radial tidal current field but do affect the local current fields. When there are no RSRs, the flood currents can directly reach Jianggang. Under practical conditions, the RSRs block the tidal currents during a flood tide to some extent. This phenomenon is particularly pronounced when the RSRs are partially reclaimed. For example, during an ebb tide, when the tidal currents encounter sand ridges or reclamation areas, their streamlines bend, and they flow around the obstacles. This change will affect the material transport, sediment deposition and seabed erosion.

scholarly journals A Morphodynamic Modeling Study on the Formation of the Large‐Scale Radial Sand Ridges in the Southern Yellow Sea

2019 ◽  
Vol 124 (7) ◽  
pp. 1742-1761 ◽  
Author(s):  
Jianfeng Tao ◽  
Zheng Bing Wang ◽  
Zeng Zhou ◽  
Fan Xu ◽  
Changkuan Zhang ◽  
...  
Keyword(s):  
Yellow Sea ◽  
Large Scale ◽  
Southern Yellow Sea ◽  
The Southern Yellow Sea ◽  
Sand Ridges ◽  
Radial Sand Ridges ◽  
Morphodynamic Modeling ◽  
Modeling Study

scholarly journals COMPARISON OF TIDAL CURRENTS UNDER DIFFERENT NOURISHMENT SCHEMES ON WEST BEACH OF BEIDAIHE, CHINA

2011 ◽  
Vol 1 (32) ◽  
pp. 32 ◽  
Author(s):  
Yu Zhang ◽  
Cuiping Kuang ◽  
Lulu He ◽  
Yi Pan ◽  
Yanxiong Yang ◽  
...  
Keyword(s):  
Numerical Model ◽  
Shallow Water Equations ◽  
Tidal Current ◽  
Unstructured Grid ◽  
Field Survey ◽  
Tidal Level ◽  
Current Field ◽  
Primary Analysis ◽  
Project Area ◽  
Tidal Current Velocity

This paper detailed a study on the tidal current field around a beach nourishment project including submerged breakwaters and jetties. The effect of different nearshore structure arrangements on the tidal current field was studied utilizing a numerical model build based on the solution of two-dimensional shallow water equations and an unstructured grid. In order to calibrate the numerical model, field survey was conducted at 5 current stations and a tidal level station around the project area. According to a primary analysis on stability, environment, sight of the beach, and construction quantity, four project schemes were chosen and simulated. After comparing the modeling results, the effects of submerged breakwaters and jetties were discussed. Conclusively, it is feasible to protect the filled sand on west beach by jetties and submerged breakwaters through obvious tidal current velocity reduction in the nearshore area.

Radial tidal current field in a semi-enclosed rectangular basin: formation and evolution

2015 ◽  
Vol 33 (4) ◽  
pp. 1085-1099 ◽  
Author(s):  
Xuesheng Qian ◽  
Yongping Chen ◽  
Changkuan Zhang ◽  
Yi Pan ◽  
Himangshu Das
Keyword(s):  
Tidal Current ◽  
Current Field ◽  
Rectangular Basin ◽  
Basin Formation ◽  
Formation And Evolution
Sign in / Sign up

Export Citation Format

Share Document