近海海上风电场水下噪声传播模型适用性研究

发布时间：2018-07-28 20:32

【摘要】：通过现场采集近海海上风电场工程区运营期风机水下噪声和背景噪声数据,计算了噪声信号的倍频带声压级,功率谱级和峰值声压级,确定了海上风电场水下噪声总声源级为148.3 d B,以此开展近海海上风电工程风机水下噪声频域特性、功率密度谱特性等研究。在此基础上使用Kraken简正波模型和Bellhop射线模型对风电场运营期风机水下噪声在水平与垂直方向上的传播进行模拟,模拟了噪声在不同频带内的衰减程度,结果显示模型模拟结果在不同频率下的衰减趋势有着很大差异,产生了明显的多途干涉现象,通过实测数据对建立的噪声传播模型进行验证,发现Kraken简正波模型在500 Hz以下,Bellhop射线模型在500 Hz以上适合模拟实际水下噪声传播情形,同时海区本身背景噪声的存在会对预测的准确性产生影响。这些结论可用于进一步对近海海上风电场水下噪声传播的研究。
[Abstract]:By collecting the data of underwater noise and background noise of fans in offshore wind farm, the frequency band pressure level, power spectrum level and peak sound pressure level of noise signal are calculated. The total sound source level of underwater noise in offshore wind farm is determined to be 148.3 dB, so as to study the frequency domain characteristics and power density spectrum characteristics of underwater noise in offshore wind power engineering fan. On this basis, Kraken normal wave model and Bellhop ray model are used to simulate the horizontal and vertical propagation of fan underwater noise in wind farm operation period, and the attenuation degree of noise in different frequency bands is simulated. The results show that the attenuation trend of the model at different frequencies is very different, and the phenomenon of multipath interference is obvious. The noise propagation model is verified by the measured data. It is found that the Kraken normal wave model below 500Hz is suitable for simulating the actual underwater noise propagation, and the existence of background noise in the sea area will affect the accuracy of the prediction. These conclusions can be used to further study the underwater noise propagation of offshore wind farms.
【作者单位】：上海海洋大学海洋科学学院;
【基金】：海洋公益性行业科研专项经费项目(201205010)~~
【分类号】：TM614

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