SWAN模型中不同风拖曳力系数对风浪模拟的影响

发布时间：2018-04-13 08:22

本文选题：风拖曳力系数 + SWAN模型　；参考：《海洋学报》2017年11期

【摘要】：本文以荷兰哈灵水道海域为实验区域,通过敏感性实验,研究了在14m/s、31.5m/s和50m/s(分别代表一般大风、强热带风暴和强台风的极端条件)定常风速下SWAN模型中不同风拖曳力系数对风浪模拟的影响程度。结果表明,对于近岸浅水区域(水深小于20m),风拖曳力系数计算方案的选择对有效波高影响较小,而且当风速增加到一定程度后,波浪破碎成为影响波高值的主要因素;对于深水区域(水深大于30m),一般大风条件下风拖曳力系数计算方案的选择对有效波高影响仍然较小,随着风速的继续增大,风拖曳力系数计算方案的选择对有效波高的影响逐渐显著。对于平均周期,风拖曳力系数计算方案的选择和风速的改变对其影响均较小,而由水深变浅导致的波浪破碎对其影响较为显著。根据敏感性实验结果,本文对SWAN模型中风拖曳力系数计算方案的选择做出如下建议:计算近岸浅水区域风浪场或深水区域一般大风条件风浪场时,其风拖曳力系数可以直接采用模型默认选项;而对于深水区域更大风速条件,可首先采用模型默认选项试算,然后结合当地海域实测波浪资料进行修正。
[Abstract]:In this paper, using the Hallin waterway in the Netherlands as the experimental area, the sensitivity test was used to study the effects of 31.5 m / s and 50 m / s on 14m / s / s respectively.Extreme conditions of strong Tropical Storm and strong Typhoon) the influence of different drag coefficients on wind wave simulation in SWAN model under steady wind speed.The results show that in the shallow water area (water depth less than 20mg), the selection of the calculation scheme of wind drag force coefficient has little effect on the effective wave height, and when the wind speed increases to a certain extent, wave breakage becomes the main factor affecting the wave height.For deep water area (water depth > 30mg), the selection of calculating scheme of wind drag force coefficient under general strong wind condition still has little effect on effective wave height, and with the increase of wind speed,The selection of the calculation scheme of wind drag force coefficient has a significant effect on the effective wave height.For the mean period, the selection of the calculation scheme of wind drag force coefficient and the change of wind speed have little effect on it, but the wave breaking caused by water depth becoming shallow has a more significant effect on it.Based on the sensitivity experiment results, the following suggestions are made for the selection of the calculation scheme for the stroke drag force coefficient of the SWAN model: when calculating the wind wave field in the shallow water area near the shore or the wind wave field in the general windy condition in the deep water region,The model default option can be used directly for the wind drag force coefficient, while for the larger wind speed conditions in the deep water area, the model default option can be used first and then modified with the measured wave data in the local sea area.
【作者单位】：天津科技大学海洋与环境学院;天津市海洋环境与修复技术工程中心;
【基金】：国家自然科学基金项目(41276016) 国家科技支撑计划资助项目(2010BAC68B04) 天津科技大学科学研究基金资助项目(20130113)
【分类号】：P731.22

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