基于LSTM神经网络的青藏高原月降水量预测

doi:10.12082/dqxxkx.2020.190378

Abstract

Abstract:

Precipitation prediction on the Qinghai-Tibet Plateau not only provides a basis for rational planning and utilization of water resources, but also has significance for climate change research in China and neighboring countries. In this paper, the Long Short Term Memory neural network （LSTM） was used to predict the monthly precipitation over the Qinghai-Tibet Plateau using data from 1990 to 2016. Firstly, the monthly precipitation data of 86 stations in the Qinghai-Tibet Plateau from 1990 to 2013 were used to predict the monthly precipitation of each station from 2014 to 2016. Comparing with the traditional RNN, NAR, SSA, and ARIMA prediction models, LSTM increased the average coefficient of determination （R²） by 0.07, 0.15, 0.13, and 0.36, respectively. Simultaneously, LSTM had lower Root Mean Squared Error （RMSE） and Mean Absolute Error （MAE）. Among them, the observation of station 56106 showed that the LSTM model predicted the period more accurately with less displacement deviation, and that the prediction of the valley between July and September was more accurate with R² reaching 0.87. Secondly, the spatial distribution characteristics of precipitation prediction accuracy were analyzed. The R²of each model was interpolated in the Qinghai-Tibet Plateau, and the spatial distribution characteristics of R²were analyzed. All the drought areas with rare rainfall and the wet areas with heavy rainfall were of lower R², while the areas with stable climate and obvious precipitation were of higher R². Areas of R² over 0.6 were much larger when using the LSTM model than the traditional model. Finally, influence of different prediction lengths on the prediction accuracy was analyzed for each model. All models showed decreased prediction accuracy as the prediction length increased, yet the RMSE values predicted by LSTM were lower than by other models with the varying prediction lengths.

Key words: LSTM neural network, precipitation, prediction, RNN neural network, Qinghai-Tibet Plateau, time series, machine learning

LIU Xin, ZHAO Ning, GUO Jinyun, GUO Bin. Prediction of Monthly Precipitation over the Tibetan Plateau based on LSTM Neural Network[J].Journal of Geo-information Science, 2020, 22(8): 1617-1629.DOI:10.12082/dqxxkx.2020.190378

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References 29

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自相关系数	偏相关系数	模型定阶
拖尾	p阶截尾	AR（p）模型
q阶截尾	拖尾	MA（q）模型
拖尾	拖尾	ARMA（p, q）模型

评价指标	LSTM	RNN	NAR	SSA	ARIMA
RMSE	19.69	29.82	32.15	33.77	54.46
MAE	14.06	18.57	24.17	22.17	40.67
R²	0.87	0.70	0.65	0.61	0.28

评价指标	LSTM	RNN	NAR	SSA	ARIMA
RMSE	26.83	28.87	31.64	30.17	38.01
MAE	17.91	20.65	22.77	21.04	26.47
R²	0.61	0.55	0.46	0.48	0.25

预测长度/个月	LSTM	RNN	NAR	SSA	ARIMA
36	26.83	28.87	31.64	30.17	38.01
24	26.23	28.16	30.45	29.37	35.82
12	25.21	27.52	29.95	28.78	36.24
6	19.89	23.85	26.58	25.10	27.30

Prediction of Monthly Precipitation over the Tibetan Plateau based on LSTM Neural Network

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