# A GIS-based three-dimensional landslide generated waves height calculation method

## Summary (1 min read)

### 1. Introduction

- The most notable feature of GIS is that they can transform vector data into grid data sets based on a grid column unit model (Xie et al., 2006a) .
- Because of the high 3D spatial data processing capability of GIS, many scholars have added geotechnical professional models to their respective systems.
- Their research team established a 3D limit equilibrium method based on GIS, and developed a slope stability analysis module called 3Dslope (Xie et al., 2003a; 2003b; 2006b) .
- Mergili (2014) combined GRASS GIS and the 3D Hovland model to implement a 3D slope stability model capable of considering shallow and deep-seated slope failures.

### GIS.

- Column unit model to establish a 3D landslide model, and proposes a method for calculating the waves height.
- Compared with 2D analysis methods, the 3D method proposed in this paper better represents the actual spatial state of landslides.
- Simultaneously, the resistance of the water is considered to improve the accuracy of the calculation result.

### 2.3. The spatial relationships among parameters

- To facilitate subsequent calculations, the XOY coordinate system was converted to an X ´CY ´ coordinate system.
- The X ´-axis direction was defined as the sliding direction of the landslide.
- The right-hand rule determined the positive directions of the Y ´-and Z-axes.

### 2.5. Dynamic equation based on grid column units

- When the obtained horizontal acceleration is negative, the maximum velocity can be obtained.
- Finally, ax and vx in the calculation process can be plotted as respective curves versus the sliding time.

### 4.3. Waves analysis

- The calculations indicate that the results of the 2D method are smaller than those of the 3D method.
- Compared that of the 2D method, the computational model of the 3D method better represents the actual spatial state of the landslide.

### 5. Conclusions

- Because the Pan Jiazheng method is based on a 2D section, the calculation results will vary with the selected section.
- The 3D landslide body model based on grid column units is used to overcome the above shortcomings, and the calculation model better represents the actual spatial state of the landslide body.
- Therefore, the proposed method is more suitable for practical risk assessment.

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##### References

135 citations

### "A GIS-based three-dimensional lands..." refers background in this paper

...Each rectangular unit has a corresponding row and column 81 number and is assigned an attribute value that represents the grid unit (Xie et al., 2004)....

[...]

98 citations

88 citations

### "A GIS-based three-dimensional lands..." refers methods in this paper

...For example, our research team established a 3D 58 limit equilibrium method based on GIS, and developed a slope stability analysis module 59 called 3Dslope (Xie et al., 2003a; 2003b; 2006b)....

[...]

78 citations

### "A GIS-based three-dimensional lands..." refers methods in this paper

...…mainly be 29 divided into analytical method (Noda, 1970; Pan, 1980; Huang et al., 2012; Miao et al., 2011; 30 Di et al., 2008), numerical simulation method (Silvia and Marco, 2011; Montagna et al., 31 2011), and physical modelling method (Ataie-Ashtiani and Nik-Khah, 2008; Cui and Zhu, 32 2011)....

[...]

54 citations