Acta Geodaetica et Cartographica Sinica ›› 2022, Vol. 51 ›› Issue (10): 2183-2195.doi: 10.11947/j.AGCS.2022.20220290

Previous Articles     Next Articles

Application of dynamic optimization time-delay GM(1,2) model in landslide displacement prediction considering the influence of rainfall

GAO Yaping1,2, CHEN Xi2, TU Rui3   

  1. 1. School of Geological Engineering and Geomatics, Chang'an University, Xi'an 710054, China;
    2. College of Earth Science, Chengdu University of Technology, Chengdu 610059, China;
    3. National Time Service Center, Chinese Academy of Sciences, Xi'an 710600, China
  • Received:2022-05-05 Revised:2022-07-10 Published:2022-11-05
  • Supported by:
    The Applied Basic Research Project of Science and Technology Department of Sichuan Province, China (No. 2020YJ0362); Science and Technology Open Fund of Sichuan Society of Surveying, Mapping and Geoinformatics (No. CCX202114)

Abstract: In addition to the displacement caused by its own gravity, the landslide body is also affected by rainfall, but usually the effect of rainfall on the displacement of the landslide has a hysteresis. In order to analyze and predict the impact of rainfall on landslide displacement, this paper proposes a dynamic optimization time-lag time-lag GM(1,2) landslide displacement prediction model that takes into account the impact of rainfall. First, use EMD (empirical mode decomposition) to decompose the displacement sequence and reconstruct the periodic displacement sequence and the trend displacement sequence through the time sequence. Perform time lag analysis and correlation analysis on the rainfall data and the landslide periodic displacement sequence, determine the time lag and the degree of influence, and establish an optimization based on the background value. The dynamic time-lag GM(1,2) model predicts the cyclic displacement change of the landslide caused by the change of rainfall. At the same time, a threshold autoregressive model is established to predict the trend displacement of the landslide tending to natural changes. Finally, the landslide prediction displacement taking into account the influence of rainfall is obtained through time series superposition. Established a dynamic optimization time lag time GM(1,2) combined forecasting method that takes into account the rainfall factor. The paper uses the monitoring data of Funing Bachimen landslide and Zigui county Bazimen landslide as examples to verify the accuracy of the dynamic optimization time-lag GM(1,2) model, and compares and analyzes the prediction results with other models. The experimental results show that the dynamic the optimized time-lag time series GM(1,2) combined forecasting model can accurately predict the landslide displacement changes caused by rainfall, and the forecasting effect is better, the combined model has certain reference value for the early warning and prevention of landslide disasters.

Key words: prediction of landslide displacement, rainfall, time series, correlation analysis, dynamic optimization time-delay GM(1,2) model, threshold autoregressive model

CLC Number: