Investigation of Three Dimensional Tidal Stream Energy in Surrounding Water Areas of ZTD, China

2013 ◽  
Vol 774-776 ◽  
pp. 262-266
Author(s):  
Bing Chen Liang ◽  
Tao Tao Zhang ◽  
Hong Da Shi
Keyword(s):  
Numerical Modeling ◽  
Energy Density ◽  
Tidal Current ◽  
Current Model ◽  
Three Dimensional ◽  
Coastal Zones ◽  
Surrounding Water ◽  
Tidal Current Velocity ◽  
Tidal Stream ◽  
Tidal Stream Energy

In the present work, the tidal stream energy in surrounding coastal zones of ZTD is calculated. The tidal current velocity is gotten by three dimensional numerical modeling. The tidal current model is validated by measurement of tidal current observed in 4 points surrounding ZTD. The numerical results given by the tidal current model already shows that: the tidal current velocities given by the model agree with the measured velocities generally. The characteristics of tidal currents around ZTD are analyzed and the following tidal stream energy density is calculated. The maximum tidal stream energy flux of unit width occurs around the middle locations of ZTD southern areas.

scholarly journals In-Stream Energy by Tidal and Wind-Driven Currents: An Analysis for the Gulf of California

Energies ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1095
Author(s):  
Vanesa Magar ◽  
Victor M. Godínez ◽  
Markus S. Gross ◽  
Manuel López-Mariscal ◽  
Anahí Bermúdez-Romero ◽  
...  
Keyword(s):  
Tidal Current ◽  
Gulf Of California ◽  
Energy Production ◽  
Three Dimensional ◽  
Energy Resources ◽  
Sediment Type ◽  
Tidal Power ◽  
Tidal Stream ◽  
Wind Driven Currents ◽  
Hycom Model

We analyzed the peak spring tidal current speeds, annual mean tidal power densities ( T P D ) and annual energy production ( A E P ) obtained from experiment 06.1, referred as the “HYCOM model” throughout, of the three dimensional (3D), global model HYCOM in an area covering the Baja California Pacific and the Gulf of California. The HYCOM model is forced with astronomical tides and surface winds alone, and therefore is particularly suitable to assess the tidal current and wind-driven current contribution to in-stream energy resources. We find two areas within the Gulf of California, one in the Great Island Region and one in the Upper Gulf of California, where peak spring tidal flows reach speeds of 1.1 m per second. Second to fifth-generation tidal stream devices would be suitable for deployment in these two areas, which are very similar in terms of tidal in-stream energy resources. However, they are also very different in terms of sediment type and range in water depth, posing different challenges for in-stream technologies. The highest mean T P D value when excluding TPDs equal or less than 50 W m−2 (corresponding to the minimum velocity threshold for energy production) is of 172.8 W m−2, and is found near the town of San Felipe, at (lat lon) = (31.006–114.64); here energy would be produced during 39.00% of the time. Finally, wind-driven currents contribute very little to the mean T P D and the total A E P . Therefore, the device, the grid, and any energy storage plans need to take into account the periodic tidal current fluctuations, for optimal exploitation of the resources.

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 Characterization of the vertical evolution of the three-dimensional turbulence for fatigue design of tidal turbines

2020 ◽  
Vol 378 (2178) ◽  
pp. 20190495 ◽  
Author(s):  
Maxime Thiébaut ◽  
Jean-François Filipot ◽  
Christophe Maisondieu ◽  
Guillaume Damblans ◽  
Christian Jochum ◽  
...  
Keyword(s):  
Turbulence Intensity ◽  
Large Scale ◽  
Three Dimensional ◽  
Vertical Direction ◽  
Tidal Energy ◽  
Tidal Turbines ◽  
Tidal Stream ◽  
Vertical Evolution ◽  
Tidal Stream Energy ◽  
Scale Turbulence

A system of two coupled four-beam acoustic Doppler current profilers was used to collect turbulence measurements over a 36-h period at a highly energetic tidal energy site in Alderney Race. This system enables the evaluation of the six components of the Reynolds stress tensor throughout a large proportion of the water column. The present study provides mean vertical profiles of the velocity, the turbulence intensity and the integral lengthscale along the streamwise, spanwise and vertical direction of the tidal current. Based on our results and considering a tidal-stream energy convertor (TEC) aligned with the current main direction, the main elements of turbulence prone to affect the structure (material fatigue) and to alter power generation would likely be: (i) the streamwise turbulence intensity ( I x ), (ii) the shear stress, v ′ w ′ ¯ , (iii) the normal stress, u ′ 2 ¯ and (iv) the vertical integral lengthscale ( L z ). The streamwise turbulence intensity, ( I x ), was found to be higher than that estimated at other tidal energy sites across the world for similar height above bottom. Along the vertical direction, the length ( L z ) of the large-scale turbulence eddies was found to be equivalent to the rotor diameter of the TEC Sabella D10. It is considered that the turbulence metrics presented in this paper will be valuable for TECs designers, helping them optimize their designs as well as improve loading prediction through the lifetime of the machines. This article is part of the theme issue ‘New insights on tidal dynamics and tidal energy harvesting in the Alderney Race’.

scholarly journals Tidal stream energy site assessment via three-dimensional model and measurements

2013 ◽  
Vol 102 ◽  
pp. 510-519 ◽  
Author(s):  
Paul A. Work ◽  
Kevin A. Haas ◽  
Zafer Defne ◽  
Thomas Gay
Keyword(s):  
Three Dimensional ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Site Assessment ◽  
Tidal Stream ◽  
Tidal Stream Energy

scholarly journals Three-dimensional modelling of turbine wake interactions at a tidal stream energy site

2020 ◽  
Vol 95 ◽  
pp. 102009 ◽  
Author(s):  
Michelet N ◽  
Guillou N ◽  
Chapalain G ◽  
Thiébot J ◽  
Guillou S ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Wake Interactions ◽  
Tidal Stream ◽  
Tidal Stream Energy ◽  
Turbine Wake

scholarly journals In-Stream Energy by Tidal and Wind-Driven Currents: An Analysis for the Gulf of California

2020 ◽  
Author(s):  
Vanesa Magar ◽  
Victor M. Godínez ◽  
Markus S. Gross ◽  
Manuel López-Mariscal ◽  
Anahí Bermúdez-Romero ◽  
...  
Keyword(s):  
Tidal Current ◽  
Gulf Of California ◽  
Energy Production ◽  
Three Dimensional ◽  
Energy Resources ◽  
Sediment Type ◽  
Tidal Power ◽  
Tidal Stream ◽  
Wind Driven Currents ◽  
Hycom Model

We analyzed the peak spring tidal current speeds, annual mean tidal power densities (TPD) and annual energy production (AEP) obtained from experiment 06.1, referred as the "HYCOM model" throughout, of the three dimensional (3D), global model HYCOM in an area covering the Baja California Pacific and the Gulf of California. The HYCOM model is forced with astronomical tides and surface winds alone, and therefore is particularly suitable to assess the tidal current and wind-driven current contribution to in-stream energy resources. We find two areas within the Gulf of California, one in the Great Island Region and one in the Upper Gulf of California, where peak spring tidal flows reach speeds of 1.1 meters per second. Second to fifth-generation tidal stream devices would be suitable for deployment in these two areas, which are very similar in terms of tidal in-stream energy resources. However, they are also very different in terms of sediment type and range in water depth, posing different challenges for in-stream technologies. The highest mean TPD value when excluding TPDs equal or less than 50 W/m2 (corresponding to the minimum velocity threshold for energy production) is of 172.8 W/m2, and is found near the town of San Felipe, at (lat lon) = (31.006 -114.64); here energy would be produced during 39.00% of the time. Finally, wind-driven currents contribute very little to the mean TPD and the total AEP. Therefore, the device, the grid, and any energy storage plans need to take into account the periodic tidal current fluctuations, for optimal exploitation of the resources.

scholarly journals Numerical simulation of three-dimensional hydrodynamic characteristics and pollutant diffusion behavior by ROMS model

2020 ◽  
Author(s):  
Jing Ren ◽  
Chazhong Ge ◽  
Chunxu Hao ◽  
Rui Hu ◽  
Kefu Cui ◽  
...  
Keyword(s):  
Tidal Current ◽  
Water Exchange ◽  
Current Model ◽  
Three Dimensional ◽  
Control Unit ◽  
Distribution Patterns ◽  
Hydrodynamic Characteristics ◽  
Bohai Bay ◽  
Offshore Area ◽  
Roms Model

Abstract Based on the ROMs model, a three-dimensional hydrodynamic model and a convection diffusion model are built in this paper. The three-dimensional tidal current model is intended to reflect the distribution characteristics of the tidal level and the flow field of water with different depths of the Bohai Bay. On this basis, water exchange correlation matrix is adopted to analyze the water exchange characteristics of the offshore area of Binzhou City in the offshore planning functional area of the Bohai Bay. Considering the functional planning of offshore area of Binzhou city, the paper simulates how COD and NH4 + -N in the water discharged from the sewage outfall of the city migrate and disperse under tidal current. In this way, the paper concludes the concentration distribution patterns of pollutants at different times. The results serve as basis and reference to delimitation of environmental management and control unit demarcation in Binzhou nearshore.

Numerical Analysis of Hydrodynamic on Tidal Current Energy Extraction under Marine Platform

2014 ◽  
Vol 687-691 ◽  
pp. 674-678
Author(s):  
Jing Liu ◽  
Yong Ma ◽  
Jia Xin Li
Keyword(s):  
Tidal Current ◽  
Near Field ◽  
Three Dimensional ◽  
Energy Extraction ◽  
Surrounding Water ◽  
Tidal Current Energy ◽  
Electric Generator ◽  
Hydrodynamic Response ◽  
Marine Platform ◽  
Current Energy

In this paper, different numerical methods on tidal current energy extraction of near-field and far-field hydrodynamic response are used to conduct simulation study. And the following aspects are used for simulation, including CFD model is used to establish three-dimensional numerical flume, layout plan of more tidal current energy electric generator with different spaces is designed, changes in near-field hydrodynamic are stimulated as well as the calculated results are compared and analyzed, in order to more clearly understand the influence of tidal current energy generator to the surrounding water flow, which has a certain guiding function for the optimization of tidal current energy generator group and protection for the marine environment and ecology.

scholarly journals Investigation of Danube river plume formation and propagation based on numerical modeling

2021 ◽  
Vol 27 (3) ◽  
pp. 32-41
Author(s):  
Evgeny Lemeshko ◽  
Marina Tsyganova
Keyword(s):  
Numerical Modeling ◽  
Suspended Matter ◽  
Three Dimensional ◽  
Circulation Type ◽  
River Plume ◽  
Danube River ◽  
Biogenic Elements ◽  
Coastal Zones ◽  
High Level ◽  
River Mouths

The relevance of the studied circulation caused by the water river runoff deals with the anthropological impact on the ecological state of the shelf. River waters, entering into the sea, form mesoscale structures in the delta’s area, characterized by low salinity with a high level of suspended matter and dissolved organic matter. Such structures are called “plume” in modern literature. In this case, the inertial motion of the plume is free to form a rounded area or “bulge” like anticyclonic circulation type of flow. The purpose of this work is to investigate the propagation of freshened waters, formed by the river inflow, the formation of the waters hydrological structure regularities, dynamics of the buoyancy current, and thermohaline front formation on the base of numerical modeling. Numerical modeling is used to study the formation of a river plume and downward propagation of buoyancy current on the shelf without taking into account the tides forcing. A three-dimensional σ-coordinate numerical model was used, adapted for the shelf and estuaries. The calculations were carried out for a rectangular box area. The influence of changes in the main parameters of the runoff, the mouth geometry and wind forcing are considered to development of the plume and the alongshore propagation of buoyancy current. The obtained modeling results for the conditions of the Northwestern Black Sea shelf and the Danube discharge are consistent with the estimates of plume characteristics based on the archival hydrological observations data of water temperature and salinity. The results of this work can be used for further study of hydrological processes in the region of river mouths, the peculiarities of the plumes formation and evolution, assessment of the suspended matter, biogenic elements and microplastics transport in the sea and ocean coastal zones.

scholarly journals In-Stream Energy by Tidal and Wind-Driven Currents: An Analysis for the Gulf of California

2020 ◽  
Author(s):  
Vanesa Magar ◽  
Victor M. Godínez ◽  
Markus S. Gross ◽  
Manuel López-Mariscal ◽  
Anahí Bermúdez-Romero ◽  
...  
Keyword(s):  
Tidal Current ◽  
Gulf Of California ◽  
Energy Production ◽  
Three Dimensional ◽  
Energy Resources ◽  
Sediment Type ◽  
Tidal Power ◽  
Tidal Stream ◽  
Wind Driven Currents ◽  
Hycom Model

We analyzed the peak spring tidal current speeds, annual mean tidal power densities (TPD) and annual energy production (AEP) obtained from experiment 06.1, referred as the "HYCOM model" throughout, of the three dimensional (3D), global model HYCOM in an area covering the Baja California Pacific and the Gulf of California. The HYCOM model is forced with astronomical tides and surface winds alone, and therefore is particularly suitable to assess the tidal current and wind-driven current contribution to in-stream energy resources. We find two areas within the Gulf of California, one in the Great Island Region and one in the Upper Gulf of California, where peak spring tidal flows reach speeds of 1.1 meters per second. Second to fifth-generation tidal stream devices would be suitable for deployment in these two areas, which are very similar in terms of tidal in-stream energy resources. However, they are also very different in terms of sediment type and range in water depth, posing different challenges for in-stream technologies. The highest mean TPD value when excluding TPDs equal or less than 50 W/m2 (corresponding to the minimum velocity threshold for energy production) is of 172.8 W/m2, and is found near the town of San Felipe, at (lat lon) = (31.006 -114.64); here energy would be produced during 39.00% of the time. Finally, wind-driven currents contribute very little to the mean TPD and the total AEP. Therefore, the device, the grid, and any energy storage plans need to take into account the periodic tidal current fluctuations, for optimal exploitation of the resources.

Sign in / Sign up

Export Citation Format

Share Document