HUBEI AGRICULTURAL SCIENCES ›› 2023, Vol. 62 ›› Issue (4): 168-174.doi: 10.14088/j.cnki.issn0439-8114.2023.04.030

• Information Engineering • Previous Articles     Next Articles

Multi-time soil moisture dynamic prediction based on RF-BiLSTM neural network

LI Wei1,2, KUANG Chang-wu1,2, HU Xin-xin1,2   

  1. 1. Hainan Meteorological Observation Center, Haikou 570203, China;
    2. Hainan Key Laboratory of Meteorological Disaster Prevention and Mitigation in the South China Sea, Haikou 570203, China
  • Received:2022-11-07 Online:2023-04-25 Published:2023-05-12

Abstract: In order to explore the change characteristics of soil moisture and improve the prediction accuracy of soil moisture, a soil moisture prediction method based on the combination of random forest and two-way long-term and short-term memory network(RF-BiLSTM) was proposed. Using the hourly data of soil volume moisture at the depth of 10 cm from 2016 to 2021 of Sanya National Climate Observatory and the data of 7 meteorological elements (air temperature, ground temperature, 10 cm ground temperature, sunshine hours, relative humidity, precipitation and evaporation) in the same period, the multi-time soil moisture prediction was carried out. The results showed that the average absolute errors (MAE) of RF-BiLSTM model for predicting soil volume water content after 6, 12, 24 and 48 hours were 0.462%, 0.702%, 0.889% and 1.282% respectively, and the determination coefficients (R2) were 0.983, 0.967, 0.951 and 0.913 respectively. The accuracy was higher than that of the long short-term memory neural network model, and BP neural network model.

Key words: bidirectional long short-term memory neural network(BiLSTM), random forest, soil moisture, multi-time prediction

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