基于EEMD-LSTM模型的天山北坡经济带年降水量预测

doi:10.13866/j.azr.2021.05.05

Abstract

Abstract:

Precipitation prediction is both an essential and challenging component of modern climate prediction. In the precipitation prediction in Xinjiang, the research and application of coupling models are very limited. Therefore, this paper attempts to establish the ensemble empirical mode decomposition (EEMD) and long short-term memory (LSTM) neural network coupling models to predict precipitation in the Northern Slope Economic Belt of Tianshan Mountains. Firstly, the precipitation data recorded in the study area during 55 years, from 1965 to 2019, were decomposed into four stationary components and trend terms using the EEMD, and the quasi period of each component was obtained by spectral analysis, which provided the basis for the subsequent training of the LSTM model. Then, each EEMD component was trained into the LSTM network model, and the models were used for predictions. The reconstruction and comparison of the results revealed that the average relative error and root mean square error of the 2010-2019 model were 13.38% and 38.03 mm, respectively. Therefore, it is inferred that the EEMD-LSTM coupling model can achieve a better precipitation prediction accuracy in the study area. The model was used to predict annual precipitation in the Northern Slope Economic Belt of Tianshan Mountains from 2020 to 2029; within this period, six years presented more and four years presented less precipitation. Year 2025 is predicted to be an extremely humid year with more than 20% of precipitation in excess; while 2021 is anticipated as an extremely dry year, with expected precipitation amounting to less than 200 mm. This study explored a new method of precipitation prediction in an arid area, and provided a reference for meteorological disaster prevention and mitigation.

Key words: ensemble empirical mode decomposition, long short-term memory network, annual precipitation, prediction

YANG Qian,QIN Li,GAO Pei,ZHANG Ruibo. Prediction of annual precipitation in the Northern Slope Economic Belt of Tianshan Mountains based on a EEMD-LSTM model[J].Arid Zone Research, 2021, 38(5): 1235-1243.

Figures/Tables 11

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References 29

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分量	准周期/a	方差贡献率/%
IMF₁	2.9	54.54
IMF₂	7.5	15.70
IMF₃	16.0	7.75
IMF₄	51.2	0.45
RES	无	20.15

分量	隐藏层单元数/个	训练次数/次	Dropout
IMF₁	160	30000	0.5
IMF₂	100	600	0.5
IMF₃	16	5000	0.1
IMF₄	16	1000	0.2
RES	128	10000	0.5

	2010年	2011年	2012年	2013年	2014年	2015年	2016年	2017年	2018年	2019年
绝对误差/mm	16.44	17.48	37.22	9.07	9.38	59.48	52.35	20.17	39.3	64.04
相对误差/%	5.98	7.41	17.75	3.89	4.37	20.08	17.18	9.27	17.04	30.79
距平符号	同号	同号	异号	同号	同号	同号	同号	异号	异号	异号

	配对差值					T	自由度	显著性（双尾）
	平均值	标准偏差	标准误差	差值的95%置信区间
	平均值	标准偏差	标准误差	下限	上限
预测值与观测值	3.24	27.12	4.39	-5.68	12.15	0.74	37	0.47

	2020年	2021年	2022年	2023年	2024年	2025年	2026年	2027年	2028年	2029年
降水量/mm	218.8	192.81	263.12	237.89	208.8	277.6	213.95	236.3	242.2	239.59
距平百分率/%	-5.38	-16.62	13.78	2.87	-9.71	20.04	7.48	2.18	4.74	3.61
丰枯情况	偏少	偏少	偏多	偏多	偏少	偏多	偏少	偏多	偏多	偏多

Prediction of annual precipitation in the Northern Slope Economic Belt of Tianshan Mountains based on a EEMD-LSTM model

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