scholarly journals DIRECTIONAL GROWTH FOR NUMERICAL WIND WAVE MODELS

1986 ◽  
Vol 1 (20) ◽  
pp. 47
Author(s):  
W.L. Neu ◽  
S.H. Kwon
Keyword(s):  
Growth Mechanism ◽  
First Generation ◽  
Wind Wave ◽  
Point Spectrum ◽  
Wave Model ◽  
Directional Growth ◽  
Wave Fields ◽  
Ocean Wave Model ◽  
Spreading Function ◽  
Wave Models

This study is concerned with the operation of spectral wind wave models. Many spectral wind wave models use a growth mechanism which operates on the point spectrum with directionality being introduced after the fact by the use of a spreading function. It is recognized here that this approach leads to errors whenever the wind and wave fields are not aligned. This is demonstrated by comparing the performance of two first generation models under various conditions. One makes use of a point spectral growth mechanism and follows the operation of the Spectral Ocean Wave Model (SOWM). The other uses a directional growth mechanism but is otherwise the same as the first. A large difference between the models is noted for swell corrupted seas.

scholarly journals The Fast Discrete Interaction Approximation Concept

2020 ◽  
Author(s):  
Vladislav Polnikov
Keyword(s):  
Numerical Calculation ◽  
World Wide ◽  
Wind Wave ◽  
Nonlinear Evolution ◽  
Wave Model ◽  
Discrete Interaction ◽  
Wave Models ◽  
Active Implementation ◽  
Interaction Approximation ◽  
Approximation Concept

Hasselmann and coauthors proposed the discrete interaction approximation (DIA) as the best tool replacing the nonlinear evolution term in a numerical wind-wave model. Much later, Polnikov and Farina radically improved the original DIA by means of location all the interacting four wave vectors, used in the DIA configuration, exactly at the nodes of the numerical frequency-angular grid. This provides nearly two-times enhancing the speed of numerical calculation for the nonlinear evolution term in a wind-wave model. For this reason, the proposed version of the DIA was called as the fast DIA (FDIA). In this paper we demonstrate all details of the FDIA concept for several frequency-angular numerical grids of high resolution, with the aim of active implementation the FDIA in modern versions of world-wide used wind-wave models.

scholarly journals The Fast Discrete Interaction Approximation Concept

Fluids ◽  
2020 ◽  
Vol 5 (4) ◽  
pp. 176
Author(s):  
Vladislav Polnikov
Keyword(s):  
Numerical Calculation ◽  
World Wide ◽  
Wind Wave ◽  
Nonlinear Evolution ◽  
Wave Model ◽  
Discrete Interaction ◽  
Wave Models ◽  
Active Implementation ◽  
Interaction Approximation ◽  
Approximation Concept

Hasselmann and coauthors proposed the discrete interaction approximation (DIA) as the best tool replacing the nonlinear evolution term in a numerical wind–wave model. Much later, Polnikov and Farina radically improved the original DIA by means of location all the interacting four wave vectors, used in the DIA configuration, exactly at the nodes of the numerical frequency–angular grid. This provides a nearly two-times enhancement of the speed of numerical calculation for the nonlinear evolution term in a wind–wave model. For this reason, the proposed version of the DIA was called as the fast DIA (FDIA). In this paper, we demonstrate all details of the FDIA concept for several frequency–angular numerical grids of high-resolution with the aim of active implementation of the FDIA in modern versions of world-wide used wind–wave models.

scholarly journals WIND SPECIFICATION FOR SPECTRAL OCEAN-WAVE MODELS

1986 ◽  
Vol 1 (20) ◽  
pp. 28
Author(s):  
M.L. Khandekar ◽  
B.M. Eid
Keyword(s):  
Weather Prediction ◽  
Wave Model ◽  
Numerical Weather Prediction Model ◽  
Ocean Wave ◽  
Operational Mode ◽  
Spectral Models ◽  
Ocean Wave Model ◽  
Wave Heights ◽  
Significant Wave Heights ◽  
Wave Models

This paper investigates the utility of winds obtainable from a numerical weather prediction model for driving a spectral ocean-wave model in an operational mode. Wind inputs for two operational spectral wave models were analyzed with respect to observed winds at three locations in the Canadian east coast offshore. Also, significant wave heights obtainable from the two spectral models were evaluated against measured wave data at these locations. Based on this analysis, the importance of appropriate wind specification for operational wave analysis and forecasting is demonstrated.

WAVE CLIMATE OF THE BLACK SEA’S COASTAL WATERS DURING THE LAST THREE DECADES

2017 ◽  
Author(s):  
Fedor Gippius ◽  
Fedor Gippius ◽  
Stanislav Myslenkov ◽  
Stanislav Myslenkov ◽  
Elena Stoliarova ◽  
...  
Keyword(s):  
Wind Speed ◽  
Cell Size ◽  
Coastal Waters ◽  
Wind Wave ◽  
Spatial Scales ◽  
Wave Model ◽  
Wave Climate ◽  
Computational Grid ◽  
Coastal Areas ◽  
Wave Parameters

This study is focused on the alterations and typical features of the wind wave climate of the Black Sea’s coastal waters since 1979 till nowadays. Wind wave parameters were calculated by means of the 3rd-generation numerical spectral wind wave model SWAN, which is widely used on various spatial scales – both coastal waters and open seas. Data on wind speed and direction from the NCEP CFSR reanalysis were used as forcing. The computations were performed on an unstructured computational grid with cell size depending on the distance from the shoreline. Modeling results were applied to evaluate the main characteristics of the wind wave in various coastal areas of the sea.

scholarly journals Null modes effect in Rossby wave model

2004 ◽  
Vol 11 (3) ◽  
pp. 281-293
Author(s):  
V. Goncharov ◽  
V. Pavlov
Keyword(s):  
Nonlinear Wave ◽  
Rossby Wave ◽  
Wave Model ◽  
Wave Fields

Abstract. The problem of the null-modes existence and some particularities of their interaction with nonlinear vortex-wave-like structures is discussed. We show that the null-modes are fundamental elements of nonlinear wave fields. The conditions under which null-modes can manifest themselves are elucidated. The Rossby-Hasegawa-Mima (RHM) model is used for the illustration of features of null-modes-waves interactions.

scholarly journals Long and Short-Term Simulations of Seto Inland Sea by Coupled Ocean-Wave Model

2013 ◽  
Vol 69 (2) ◽  
pp. I_511-I_515
Author(s):  
Yusuke TANAKA ◽  
Nobuhito MORI ◽  
Junichi NINOMIYA ◽  
Koichi SUGIMATSU ◽  
Hiroshi YAGI ◽  
...  
Keyword(s):  
Wave Model ◽  
Ocean Wave ◽  
Seto Inland Sea ◽  
Short Term ◽  
Ocean Wave Model

Sequential assimilation in the wind wave model for simulations of typhoon events around Taiwan Island

2011 ◽  
Vol 38 (2-3) ◽  
pp. 456-467 ◽  
Author(s):  
Tai-Wen Hsu ◽  
Jian-Ming Liau ◽  
Jaw-Guei Lin ◽  
Jinhai Zheng ◽  
Shan-Hwei Ou
Keyword(s):  
Wind Wave ◽  
Wave Model ◽  
Taiwan Island
Sign in / Sign up

Export Citation Format

Share Document