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Impact of the Waves on the sea Surface Roughness under Uniform wind Conditions:Idealized Cases for Uniform winds(Part I)

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Atmospheric and Climate Sciences 2015年第3期5卷 317-325页

作者： Jose Augusto P.Veiga Monica R.Queiroz Department of Meteorology Institute of TechnologyAmazonas State UniversityManausBrazil UNINORTE Laureate International Universities ManausBrazil

The effect of the surface gravity waves over sea surface roughness length (z0) is investigated from several idealized numerical experiments with the Wave-Watch-III (WW3) model. The WW3 model is combined with a simplified model to estimate z0, CD, u* and U10 as function of the sea state. The impacts related to the presence of the ocean waves over z0 are obtained from conditions of growing (young waves) and mature seas (old waves). The wave spectrum is obtained from WW3 model for each idealized simulation under uniform wind conditions. Uniform wind experiments range from 15 to 45 m/s. The simplified algorithm determines z0, CD, u* and U10 for cases of young waves, old waves and by the Charnock method. The results show that when the ocean is characterized by young waves, both z0 and CD (drag coefficient) increase while U10 is reduced. In Charnock case, the values of z0, CD and U10 have no dependence with the presence of gravity waves. Experiments using winds higher than 30 m/s result in young waves’ CD values higher than the CD value for old waves. Even for young waves CD values are high for cases of strong winds. The results also show that in experiments using winds higher than 30 m/s the dependence between CD and wave age becomes stronger, which is in accordance with other studies.

关键词： Surface Gravity Waves wind sea Ocean Waves Young Waves Old Waves

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Simulation Study of Disastrous Waves Along Indonesian Offshore and Coast Under Roaring Forties and Tropical Cyclones

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Journal of Marine Science and Application 2022年第1期21卷 80-91页

作者： Fumin Xu Maoling Yu Tian Xing Hanzheng Ya Key Laboratory of Ministry of Education for Coastal Disaster and Protection Hohai UniversityNanjing 210024China College of Harbor Coastal and Offshore EngineeringHohai UniversityNanjing 210024China Power China Huadong Engineering Corporation Limited Hangzhou 311122China

Indonesian offshore and coastal areas are vulnerable to swells from Roaring Forties and cyclone ***,the understanding of the characteristics and propagation mechanisms of local disastrous waves is insufficient,posing a threat to the construction,maintenance,and protection of coastal *** study establishes a multiple nested wave model based on the third-generation wave model WAVEWATCHⅢ.This model includes sole forcing of Roaring Forties and combined forcing of Roaring Forties and cyclone Ernie to simulate the influence of disastrous waves under the Roaring Forties and tropical cyclones in the Indonesian offshore zone and *** following results are *** Indonesian offshore is prevailed by relatively stable southern to southwestern dominant swells and small wind waves under the impacts of the Roaring Forties without cyclone *** propagating swells originated from the Roaring Forties dominate in nearshore coastal waters with deformed directions and strength because of the shoaling effect.

关键词： WAVEWATCHⅢ Roaring Forties Cyclone Ernie Indonesian offshore and coast wind sea Swell Wave spectrum

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