Robust Areal Landslide Prediction (RALP) software

The RALP software provides a graphical user interface (GUI) enabling users to select parameters and generate necessary files for performing physically based landslide susceptibility analysis for 3DTSP and 3DPLS.

The repository provides the necessary Python scripts to run the RALP software on Windows, Linux, and Mac OS. However, it requires users to install Python and the necessary libraries.

For Windows users, it is recommended to download the "RALP_v1_12_window_setup.exe" and install it on a local Windows PC. It already includes Python and the libraries required to run 3DTSP and 3DPLS. Therefore, it does not require users to install or set up a Python environment. If, for any reason, the software exe file is considered to be dangerous (virus or company system), please enable the anti-virus software or identify the software as safe. Otherwise, please use the start_GUI_windows.bat file to start the Windows version of the RALP software.

Update on the RALP windows version might be slower, so please check the version

More details on the installation, RALP manual, and examples are described in the "Robust Areal Landslide Prediction (RALP) - GUI v1.12 - User Manual.pdf".

References

• [3DTS] Cheon E, Oguz EA, DiBiagio A, Piciullo L (2026) A 3D Shallow Translational Landslide Susceptibility Model Accounting for Side Resistance and Vegetation Roots. Environmental Modelling & Software. 106977. https://doi.org/10.1016/j.envsoft.2026.106977
• [3DPLS] Oguz, EA, Depina I, Thakur V (2022) Effects of soil heterogeneity on susceptibility of shallow landslides. Landslides, 19(1):67-83. https://doi.org/10.1007/s10346-021-01738-x
• [3DTS] Cheon, E., Ahmet Oguz, E., DiBiagio, A., Piciullo, L., Kwon, T. H., and Lee, S. R. (2025a): A Physically-based 3D Landslide Susceptibility Model for Shallow Translational Landslides using DEM, EGU General Assembly 2025, Vienna, Austria, 27 Apr–2 May 2025, EGU25-17059, https://doi.org/10.5194/egusphere-egu25-17059
• [3DTS] Cheon E, Oguz EA, DiBiagio A, Piciullo L (2025) A 3D Shallow Translational Landslide Susceptibility Model with DEM Cells Accounting for Side Resistance and Vegetation Effects. The 9th International Symposium for Geotechnical Safety and Risk (ISGSR) at Oslo, Norway. https://doi.org/10.3850/GRF-25280825_isgsr-007-P354-cd
• [3DTS] DiBiagio, A., Schwarz, M., Borrajo-Pelaez, R., Ngo, H. M., Cohen, D., Oen, A., Tallaksen, L. M., & Capobianco, V. (2026). Quantifying the spatio-temporal mechanical reinforcement effects of the pioneer species Betula pendula on slope stability: experimental investigations and modelling for a case study in Western Norway. Ecological Engineering. https://doi.org/10.1016/j.ecoleng.2026.107984
• [3DTSP] Cheon, E., Gotaas, M., Pettersen, S., Oguz, E. A., DiBiagio, A., & Piciullo, L. (2026). Sensitivity Analysis of Physically-based 3D Landslide Susceptibility Model from Variation of Input Parameters (No. EGU26-19964). Copernicus Meetings. https://doi.org/10.5194/egusphere-egu26-19964

Acknowledgement

• The slope stability models were developed through contributions and comments by Dr. Emir A. Oguz, Amanda DiBiagio, Ole W. Eiesland and Lica Piciullo
• The preparation of the user manual was funded by the basic support and the HUT project provided to Norwegian Geotechnical Institute (NGI) by the Research Council of Norway

Contact

• Please email enok.cheon@ngi.no if you need to. However, to inform us of any found bugs, software issues, or general feedback, please use the GitHub Issues

Version

ver 1.12

• added evapotranspiration (ET) to Green-Ampt rainfall infiltration

ver 1.11

• corrected bug where "Skip (only perform infiltration)" causing error

ver 1.10

• added post-processing to evaluate the performance of 3DTSP simulation
• added early termination option to finish the simulation early
• added another root reinforcement model - DiBiagio et al. (under revision)
• generates results that would be used for runout analysis

ver 1.04

• fixed issues regarding vegetation root reinforcement model parameter (rate vs scale)
• fixed incorrect material import using GIS files

ver 1.03

• fixed issues regarding vegetation weight
• fixed incorrect plotting of 2D plots
• added feature to generate 2D animation of results over time

ver 1.02

• fixed issues regarding unit not converted when rainfall intensity is defined from GIS files

ver 1.01

• fixed issues when assigning the initial groundwater table using the "thickness above bedrock" option
• fixed the symbol of initial suction pressure to correctly show $\psi_i$ instead of $\theta_i$, as $\theta_i$ would refer to initial volumetric water content

ver 1.00

• performs combined hydrological infiltration analysis and slope stability analysis with either a deterministic or probabilistic approach for determining landslide geohazard risk with 3DPLS and 3DTS models