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基于深度学习的潮位预报订正技术研究
作者:吕忻1  丁骏2 
单位:1. 国家海洋局东海预报中心, 上海 200136;
2. 上海市海洋监测预报中心, 上海 200062
关键词:长短期记忆神经网络 深度学习 预报订正 潮位 吴淞口 
分类号:P731.34
出版年·卷·期(页码):2022·39·第二期(70-79)
摘要:
引入长短期记忆神经网络(LSTM)深度学习先进算法,通过3折滑动时间序列交叉验证结合网格搜索方法确定最佳参数,构建了吴淞口潮位预报订正深度学习模型。结合风、压气象参数,对调和分析的预报潮位进行订正,得到更为准确的订正潮位,并与非线性自回归动态神经网络(NARX)浅层学习预报订正结果对比。结果表明:120 h预报潮位经LSTM模型订正后的均方根误差为0.102 m,平均绝对误差为0.084 m,订正后误差降低了52.8%;前72 h预报潮位经LSTM模型订正后误差降低了57.3%。对比发现,LSTM模型在短期和中长期潮位预报订正中均有较好表现,NARX模型在短期预报订正中表现出色。“海神”台风风暴潮过程期间,120 h、前72 h和“主振”48 h特征时段预报潮位经LSTM模型订正后,均方根误差为0.114~0.119 m,平均绝对误差为0.100~0.102 m。
In this paper, a deep learning model to correct the tide level prediction in Wusongkou area is established based on the advanced long short term memory (LSTM) neural network and the best parameters determined by 3-fold cross validation of sliding time series and grid search method. The forecast tide level of harmonic analysis is corrected with higher accuracy using wind and pressure meteorological parameters, and is compared with the correction result of the nonlinear autoregressive exogenous (NARX) dynamic neural network. The results show that the root mean square error (RMSE) and the mean absolute error (MAE) of the 120 h forecast tide level corrected by LSTM model is 0.102 m and 0.084 m, respectively, and the error is reduced by 52.8%. Moreover, the error of 72 h forecast tide level corrected by LSTM model is reduced by 57.3%. By comparison, it is found that the LSTM model performs well in the correction of short-term and medium-term and long-term tide level forecast, while the NARX model performs well only in the correction of short-term forecast. During the storm surge process caused by typhoon Haishen, the RMSE and MAE of the forecast tide level corrected by LSTM model for the characteristic periods of 120 h, the first 72 h and 48 h are 0.114~0.119 m and 0.100~0.102 m.
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