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GIS-based calculation method of surge height generated by three-dimensional landslide.
Guo Yu1, Xiaowen Zhou2, Lei Bu3
1School of Civil Engineering and Transportation, South China University of Technology, Guangzhou, 510640, China.
A new 3D method improves landslide surge height calculation by incorporating Geographic Information Systems (GIS). This advanced approach provides more accurate risk assessments than traditional 2D models.
Area of Science:
- Geosciences
- Geotechnical Engineering
- Computational Science
Background:
- Traditional 2D methods for landslide surge height calculation have limitations in representing complex spatial dynamics.
- Geographic Information Systems (GIS) offer powerful spatial data processing capabilities that can enhance geohazard modeling.
Purpose of the Study:
- To extend the Pan Jiazheng method from 2D to 3D for improved landslide surge height calculation.
- To develop a 3D landslide surge height calculation module within a GIS environment.
- To compare the accuracy and suitability of the 3D method against the traditional 2D Pan Jiazheng method for risk assessment.
Main Methods:
- Rasterization of landslide data into grid column units.
- Establishment of a 3D force analysis model for landslides.
- Application of the vertical strip method combined with Newton's laws of motion to derive dynamic equilibrium equations for surge height calculation.
- Development of a GIS-based expansion module for 3D landslide surge height computation.
Main Results:
- The proposed 3D method yields a maximum surge height that is 24.6% greater than that calculated by the 2D Pan Jiazheng method.
- The 3D method provides a more realistic representation of the landslide's spatial state compared to 2D approaches.
- The 3D method is demonstrated to be more suitable for landslide risk assessment.
Conclusions:
- The 3D extension of the Pan Jiazheng method, integrated with GIS, offers a significant advancement in landslide surge height calculation.
- This 3D approach enhances the accuracy of surge height prediction and improves the reliability of landslide risk assessments.
- The developed GIS module facilitates practical application and analysis of 3D landslide dynamics.
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