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.

scholarly journals On Tidal Current Velocity Vector Time Series Prediction: A Comparative Study for a French High Tidal Energy Potential Site

2019 ◽  
Vol 7 (2) ◽  
pp. 46 ◽  
Author(s):  
Tony El Tawil ◽  
Nicolas Guillou ◽  
Jean-Frédéric Charpentier ◽  
Mohamed Benbouzid
Keyword(s):  
Time Series ◽  
Numerical Model ◽  
Linear Approximation ◽  
Current Velocity ◽  
Tidal Current ◽  
Tidal Energy ◽  
Energy System ◽  
Energy Potential ◽  
Tidal Current Velocity ◽  
Tidal Stream

Estimating the energy potential of tidal stream site is a key feature for tidal energy system deployment. This paper aims to compare two methods of prediction of tidal current velocities. The first one is based on the use of a fully three-dimensional (3D) numerical approach. However, while being accurate, the numerical model is highly time-consuming. The second method is based on a linear approximation of the tidal current, which only requires preliminary knowledge of local current velocities time series during two typical tidal cycles. This second method allows a very quick evaluation of the tidal stream resource during a long time period. The proposed comparison is done in three different locations of a high potential tidal energy site in west of France. It is carried out in terms of current velocity and energy harnessing for several turbines technology options (with and without yaw). The achieved results show that the linear approximation gives satisfactory evaluation of the tidal stream potential and can be a very interesting tool for preliminary site evaluation and first technology options selection. However, the fully 3D numerical model can obviously be very useful in more advanced steps of a project.

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.

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 Hydro-Oceanographic and Bathymetric Survey in Tanjung Merah as a Basis for Modelling Coastal Spatial Plans of Bitung City

2021 ◽  
Vol 328 ◽  
pp. 08006
Author(s):  
Joyce C Kumaat ◽  
Kalvin S Andaria ◽  
Denny Maliangkay
Keyword(s):  
Tidal Current ◽  
Mixed Type ◽  
Field Survey ◽  
Tidal Currents ◽  
Survey Method ◽  
Accurate Data ◽  
Bathymetric Survey ◽  
Tidal Current Velocity ◽  
Tidal Harmonic ◽  
Dominant Direction

The purpose of this study was to examine the parameters of Hydro-Oceanography (Tidal and Tidal Currents) and Bathymetry (Sea Depth) in Tanjung Merah, Bitung City. The method used in this research is a field survey method. The survey was carried out at the research location, precisely in Tanjung Merah, Matuari District, Bitung City. Equipment such as GPS Fish Finder, Floater Current Meter, Tidal Pole and Boats are supporting devices in obtaining accurate data on tides, tidal currents, and bathymetry in the waters of Tanjung Merah. The results showed that the tidal current conditions at the study site with several variations in the depth of the tidal current velocity ranged from 0.2 – 0.3 cm/sec with the dominant direction of the current towards the south. While the tides using tidal harmonic analysis for 15 days of observation, the Formzal Index is 0.93 which means that the tides in this location are mixed type with a single daily trend. Bathymetric conditions in Tanjung Merah identified the topography of the bottom of the waters is steep with depth variations between 2 -30 meters along the coast of Tanjung Merah while shallow areas are found at the mouth of the Tanjung Merah river.

scholarly journals ESTIMATION OF ELECTRICITY GENERATED FROM TIDAL ENERGY IN BEDONO VILLAGE OF DEMAK REGENCY

2020 ◽  
Vol 4 (9) ◽  
pp. 13-17
Author(s):  
Agus Margiantono ◽  
Titik Nurhayati ◽  
Wahib Hasbullah
Keyword(s):  
Electric Power ◽  
Current Velocity ◽  
Tidal Current ◽  
Tidal Energy ◽  
Tidal Currents ◽  
Active Power ◽  
Tidal Current Velocity ◽  
The Village

In some places in the village of Bedono Demak Regency there is a location with high tidal current velocity, the coordinates of the Location is 6 ° 55'29.0 "S 110 ° 29'11.4" E. In this study estimated the amount of electric power that can be generated from tidal currents in the village Bedono. Estimates are made by modeling the location and the Darrieus turbine using the CFD (Computating Fluid Dinamyc) Software. From the research that has been done to get the results of electric power that can be produced in the village Bedono highest at 14-16 times 3469.413W and lowest 39.002W at 22-24 hours according to the CFD is the highest active power occurred at 14-16 at 3197.064W and the lowest 35.941W at 22-24 hours.

scholarly journals Data Concerning the Entomological Fauna in Tafat National Forest (North-East of Algeria)

2011 ◽  
Vol 68 (1) ◽  
Author(s):  
Farida BENIA ◽  
Mustapha BOUNECHADA
Keyword(s):  
Sampling Method ◽  
Quercus Ilex ◽  
Field Survey ◽  
National Forest ◽  
Current Field ◽  
Quantitative Sampling ◽  
North East ◽  
Insect Populations ◽  
Structure Diversity

A field survey was undertaken during 2006-2008. Entomological fauna was collected in four forest stations from national forest of Tafat (North-east of Algeria) using a quantitative sampling method. 152 species were found during the current field survey divided into 57 Coleoptera, 35 Hymenoptera, 29 Hemiptera, 18 Diptera and 13 Lepidoptera. Majority of the species collected are polyphagous. The results of the survey of insectes show that the risk on Quercus ilex from Tafat forest. To characterize the structure, diversity and dynamic of insect populations were discussed.

scholarly journals A robust and well-balanced numerical model for solving the two-layer shallow water equations over uneven topography

2015 ◽  
Vol 343 (7-8) ◽  
pp. 429-442 ◽  
Author(s):  
Xinhua Lu ◽  
Bingjiang Dong ◽  
Bing Mao ◽  
Xiaofeng Zhang
Keyword(s):  
Numerical Model ◽  
Shallow Water ◽  
Shallow Water Equations
Sign in / Sign up

Export Citation Format

Share Document