浮冰在规则波和双色波下的运动特性研究

Research on the motion responses of ice floe in regular and bichromatic waves

为研究浮冰在波浪下的运动特性,以单个聚氯乙烯(PVC)塑料圆板模拟浮冰,进行了一系列波浪试验研究。在规则波试验基础上,同时研究了双色波条件下的浮冰运动特性。结果显示:规则波条件下浮冰运动幅频响应算子首先随无量纲波长的增大而增大,当无量纲波长大于4.0后,运动幅频响应算子随无量纲波长的变化不明显,且趋于一定值;在双色波条件下,对应频率组成成分的浮冰运动幅频响应算子与规则波条件下随波长的变化规律一致。根据部分规则波试验结果提出预测浮冰慢漂速度的经验公式,并用已有的试验和余下的规则波与双色波试验结果进行验证。结果表明,经验公式对规则波和双色波条件下的浮冰慢漂速度的误差在20%以内,预测结果吻合较好。

To study the motion response of ice floe under wave excitation,an experiment was carried out by modelling the ice floe with a plastic polyvinyl chloride(PVC)round plate.On the basis of a series of regular wave tests,the motion response of ice floe under bichromatic wave was studied in the experiment.The results show that,under regular wave conditions,the response amplitude operator(RAO)firstly increases with non-dimensional wavelength.When the non-dimensional wavelength is greater than 4.0,the RAO tends to a certain value.The variation of response amplitude operator(RAO)of bichromatic wave with incident wave length is consistent with regular wave conditions.This research also proposed an empirical formula for predicting the drift velocity of ice floes based on part of test results,which was verified by the other experiment result and remaining regular wave and bichromatic wave test results.The results show that the error between empirical formula and experiment for the drift velocity of ice floes under the conditions of regular waves and bichromatic waves is within 20%,and the predicted results are in good agreement.