Wind stress coefficient expression method and system comprehensively considering influences of wind speed, blowing range and water depth

Abstract

The invention discloses a wind stress coefficient expression method and system comprehensively considering wind speed, blowing range and water depth influences, and belongs to the field of wind-wave-flow numerical simulation research. The method is based on a wind-wave-flow coupling action mechanism of water areas such as lakes and oceans. Two dimensionless numbers, namely a blowing range Froude number and a blowing range Reynolds number, capable of representing wind-wave-flow action intensity are constructed, a wind stress coefficient expression form containing an undetermined coefficient isestablished, then the undetermined coefficient is obtained by adopting a nonlinear regression method in combination with experiment and actual measurement data, and a final wind stress coefficient expression is obtained. According to the method, the defect that a traditional wind stress coefficient expression only considers the influence of a single wind speed factor is overcome, the limitation that the traditional wind stress coefficient expression is difficult to adapt to lake numerical simulation is broken through, and a Taihu lake water level verification result shows that the constructedwind stress coefficient expression has good rationality and great superiority. The method can be widely popularized in the field of wind-wave-flow numerical simulation research of water areas such aslakes and oceans.

Description

Technical field [0001] The invention relates to the field of wind-wave-current numerical simulation research, in particular to a wind stress coefficient expression method and system that comprehensively consider the effects of wind speed, blowing distance and water depth. Background technique [0002] On-site observational research on lakes and oceans has limitations of observation instruments and methods and many uncontrollable factors. Most of them have the characteristics of short duration and point measurement. Generally, the data obtained has large system errors, and lacks data integrity and systemicity. The use of numerical simulation methods to study the characteristics of lakes and oceans can make up for the shortcomings of on-site observation methods to a large extent and obtain a more comprehensive understanding of the characteristics of lakes and oceans. Therefore, numerical simulation methods have become an important method to study the hydrodynamics, water environmen...

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Problems solved by technology

[0007] Purpose of the invention: The purpose of the present invention is to overcome the deficiency that the existing wind stress coefficient expression only considers the influence of a single factor of wind speed, and through wind-wave-flow coupling mechanism analysis and data fitting, discloses a comprehensive consideration of wind speed, blow distance and wind speed. The expression method of wind stress coefficient affected by water depth, and further disclose the system based on the above expression method

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