US 12,277,855 B1
Method for secondary disaster early warning based on ground-based SAR monitoring of deformation data
Xianxuan Xiao, Chengdu (CN); Guojun Cai, Chengdu (CN); Weixi Shao, Chengdu (CN); Mo Xu, Chengdu (CN); Dongpo Wang, Chengdu (CN); Hui Chen, Chengdu (CN); and Jian Huang, Chengdu (CN)
Assigned to Chengdu University of Technology, Chengdu (CN)
Filed by Chengdu University of Technology, Chengdu (CN)
Filed on Sep. 1, 2024, as Appl. No. 18/822,264.
Claims priority of application No. 202410257805.8 (CN), filed on Mar. 7, 2024.
Int. Cl. G08B 31/00 (2006.01); G01S 13/90 (2006.01); G08B 21/10 (2006.01); G08B 21/18 (2006.01)
CPC G08B 31/00 (2013.01) [G01S 13/9023 (2013.01); G08B 21/10 (2013.01); G08B 21/182 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A method for secondary disaster early warning based on ground-based SAR monitoring of deformation data, comprising the following steps:
S1. monitoring an unstable area of a secondary disaster in real-time using ground-based SAR to obtain deformation monitoring data;
S2. based on the deformation monitoring data, obtaining a displacement curve of the secondary disaster unstable area over time, and using it as a displacement-time curve;
S3. setting a monitoring period, and based on the displacement-time curve, constructing a displacement change triangular area model;
S4. constructing an area-time curve based on the displacement change triangular area model, and obtaining a change trend of the area-time curve and a displacement triangular area in the displacement-time curve according to the monitoring period;
S5. dividing a development process of the secondary disaster into an initial deformation stage, a constant velocity deformation stage, and an acceleration deformation stage based on the change trend of the area-time curve and the displacement triangular area;
S6. setting one or more corresponding secondary disaster early warning levels for the initial deformation stage, the constant velocity deformation stage, and the acceleration deformation stage based on the area-time curve; and
S7. performing a secondary disaster early warning in a phased manner based on the secondary disaster early warning levels,
wherein the step S5 includes the following sub-steps:
S51. calculating the displacement triangular area within each monitoring period for the displacement-time curve, as well as a slope of the displacement-time curve, and using an area and the slope of the displacement-time curve as a secondary disaster deformation rate, wherein the slope of the displacement-time curve corresponds to the change trend of the area-time curve;
S52. when the displacement triangular area is greater than a first threshold, and a change trend of the secondary disaster deformation rate is from small to large and then to small, the displacement-time curve and a corresponding part of the area-time curve are considered as the initial deformation stage;
S53. when the displacement triangular area is less than the first threshold, and the change trend of the secondary disaster deformation rate is unchanged, the displacement-time curve and the corresponding part of the area-time curve are regarded as the uniform deformation stage; and
S54. when the displacement triangular area is greater than the first threshold, and the change trend of the secondary disaster deformation rate is gradually increasing, then the displacement-time curve and the corresponding part of the area-time curve are defined as the accelerated deformation stage.