Journal
ENGINEERING STRUCTURES
Volume 243, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.engstruct.2021.112658
Keywords
Dam safety monitoring; Malfunction sensors; Spatiotemporal data clustering; Multiple monitoring points model; Failure point; Missing time series
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Funding
- National Natural Science Foundation of China [51909215, 51979224, 52009109]
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This study established a multiple-monitoring-point (MMP) model to predict long-term missing data in malfunctioning settlement sensors by integrating spatiotemporal information. Through spatiotemporal data clustering analysis, suitable data was screened to significantly improve model prediction accuracy.
The integrity of monitoring data is important in the study of the deformation law of rockfill dams. Environment, construction, aging, and other factors result in dam monitoring sensors malfunction at the initial stage of operation. Data collection discontinue leads to insufficient monitoring data. The huge amount of missing data is lager than traditional model training samples and increases the difficulty of data recovery in failure points. In this study, the multiple-monitoring-point (MMP) model is established to extend the number of training set samples. MMP model integrates spatiotemporal information to make predictions of long-term missing data in malfunctioning settlement sensors according to the corresponding relationship among the coordinate position, environment values, and settlement. Additionally, this paper presents the study of monitoring point selection and the clustering time period division in the MMP model. The spatiotemporal data clustering analysis is used as the measurement method to determine the settlement similarity to screen the appropriate data. Experiments on large-scale real dam deformation data demonstrate that the MMP model is suitable for the long-term data prediction of failures in rockfill dam settlement monitoring. After the spatiotemporal panel data clustering analysis, the model prediction accuracy is significantly improved. This model provides a new method for dam settlement prediction and analysis.
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