r.randomwalk v1, a multi-functional conceptual tool for mass movement routing
- Author(s)
- Martin Mergili, Julia Krenn, Hone-Jay Chu
- Abstract
We introduce r.randomwalk, a flexible and multifunctional open-source tool for backward and forward analyses of mass movement propagation. r.randomwalk builds on GRASS GIS (Geographic Resources Analysis Support System - Geographic Information System), the R software for statistical computing and the programming languages Python and C. Using constrained random walks, mass points are routed from defined release pixels of one to many mass movements through a digital elevation model until a defined break criterion is reached. Compared to existing tools, the major innovative features of r.randomwalk are (i) multiple break criteria can be combined to compute an impact indicator score; (ii) the uncertainties of break criteria can be included by performing multiple parallel computations with randomized parameter sets, resulting in an impact indicator index in the range 0-1; (iii) built-in functions for validation and visualization of the results are provided; (iv) observed landslides can be back analysed to derive the density distribution of the observed angles of reach. This distribution can be employed to compute impact probabilities for each pixel. Further, impact indicator scores and probabilities can be combined with release indicator scores or probabilities, and with exposure indicator scores. We demonstrate the key functionalities of r.randomwalk for (i) a single event, the Acheron rock avalanche in New Zealand; (ii) landslides in a 61.5 km(2) study area in the Kao Ping Watershed, Taiwan; and (iii) lake outburst floods in a 2106 km(2) area in the Gunt Valley, Tajikistan.
- Organisation(s)
- Department of Geography and Regional Research
- External organisation(s)
- University of Natural Resources and Life Sciences, National Cheng Kung University
- Journal
- Geoscientific Model Development
- Volume
- 8
- Pages
- 4027-4043
- No. of pages
- 17
- ISSN
- 1991-959X
- DOI
- https://doi.org/10.5194/gmd-8-4027-2015
- Publication date
- 12-2015
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 105403 Geoinformatics, 105404 Geomorphology, 102009 Computer simulation
- Keywords
- ASJC Scopus subject areas
- Earth and Planetary Sciences(all), Modelling and Simulation
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/rrandomwalk-v1-a-multifunctional-conceptual-tool-for-mass-movement-routing(6dc30174-5356-4ca7-8c14-c687402949a4).html