Numerical Simulation Of Wind-wave Factors

Wave is one of the most active dynamics factors in ocean. Most ocean and coastal engineering are affected by waves. Therefore, the wave factors are often the most basic parameters to confirm the fabrication cost of the engineering, the building pattern, etc. When the waves in open waters are traveling from deep waters to shallow ones in near-shore area, being influenced by topography, depth of water, island, etc., the rules of wave refraction, reflection, diffraction and transfiguration are complex. The wave problem of engineering design, usually adopts mathematics model to simulate the propagation and transformation of wave, to acquire the wave factors in near-shore engineering area. The wave factors of deep waters as initial conditions of model are essential. There are two kinds of ways to obtain the wave factors of deep waters: On the one hand, to utilize the wave data for many years from the wave stations near the engineering area; On the other hand, to utilize wind field data to calculate wind-wave, then to confirm the wave factors of deep waters indirectly. Considering some near-shore engineering areas, lack of the practical data for wave and wind field, this paper propose a calculation model system which utilizes historical weather map to calculate wind fieid factors, then to calculate the wind-wave field.The calculation model of this paper is mainly made up of three parts, they are as follows, the wind field model, wind-wave field model and transfiguration model for wave propagation in near-shore area. Firstly, utilize the historical weather map, adopt the gradient wind formula to calculate the wind field of this area, and correct the wind velocity and wind direction according to four common methods of wind-waves prediction and wave factors of engineering design, the Code of Hydrology for Sea Harbor included, considering the water temperature difference, ground friction resistance, crooked degree in isobar, combined by the influence of the maximum velocity from the near station. After confirming the wind field factor, utilize the Regional Sea-wave Evolvement Numerical Calculation Mode of YW-SWP, to calculate the corresponding distribution of wave field under effects of wind field, then to confirm the wave factor of the deep-water wave in open waters. According to the wave factor of deep waters, utilize the mathematics model of the shallow water wave refraction, diffraction and transformation to calculate the wave elements in the planned engineering area.Utilize experience formula for wind-waves calculation and corresponding numerical model of characteristic wind-waves in deep water, the "New-type and Mixed Wave Numerical Mode" of China Ocean University included, commonly used at home and abroad at present, to validate the Regional Wave Evolvement Numerical Calculation Mode of YW-SWP in theory, at the same time utilize the practical wave data to relatively verify it. Finally, apply the model to the wave calculation of a project area in northern Jiangsu Province. The results indicate the favorable inosculation with theoretical and practical values. The distribution of wave field is reasonable and basically unanimous with the results of adopting other models on wave calculation, which has proved the correctness of this model in theory and the practicability on engineering.