Case studies for computational experiments

Please cite this site and its content as: Mergili, M., Krenn, J., 2017. r.avaflow - The open source GIS simulation model for granular avalanches and debris flows. Case studies for computational experiments. http://www.avaflow.org/casestudies.html

r.avaflow is evaluated both with well-controlled, innovative laboratory experiments for debris flows, and with well-documented real-world events. The events selected for model evaluation cover a broad range of process types - including process chains - collected from a diverse selection of study areas around the globe. Generic landscapes are used to explore the plausibility of the simulation results for complex process chains where no or insufficient reference data are available.

Generic reservoir

Generic landscape with landslides into reservoir

Complex process chain

This generic landscape builds on a wide mountain valley with an amphitheatre-shaped head. A reservoir is impounded by a dam with triangular cross section. Two landslide release areas shaped as distorted hemi-ellipsoids are defined on the slopes heading into the reservoir. The purpose of this landscape is to explore the plausibility of r.avaflow simulation results for complex process chains, with a particular focus on landslide impacts on reservoirs and the resulting flood waves downstream. The start script provided below serves for three computational experiments with different configurations of landslide release and entrainment. In addition to the two landslide release masses an input hydrograph and an output hydrograph profile are defined. The input hydrograph file is provided for download below. Also the script for reconstructing the landscape within the corresponding GRASS location is provided below. It can be used to modify the landscape characteristics for designing your own computational experiments.

The experiments performed on this generic landscape are described in detail by Mergili et al. (2016).

Download:
[xre_area] GRASS location for the generic landscape
[xre.construction.sh] Script for construction of the generic landscape
[xre_hydrograph.txt] Input hydrograph file
[xre.avaflow.start.sh] Start script for running r.avaflow [EXPERT] (Version 1.0) on the generic landscape
View:
Visualization of selected model results
Acheron rock avalanche
View more images of this rock avalanche

Acheron rock avalanche

Rock avalanche

The Acheron rock avalanche is a prehistoric event that occurred approx. 1100 years BP in Canterbury, New Zealand. It is characterized by an estimated volume of 6.4 million cubic metres and a travel distance of approx. 3.55 km. The flow path displays a sharp bend, and lateral spreading to some tributary valleys was limited. This example is used to test r.avaflow for rock avalanches, exploring the complementary function for stopping and the sensitivity of the model results to selected input parameters. The GRASS location for the Acheron rock avalanche and the corresponding start script for launching these computational experiments are provided below.

The experiments performed on the Acheron rock avalanche are described in detail by Mergili et al. (2016).

Download:
[ac_area] GRASS Location for the Acheron rock avalanche
[ac.avaflow.start.sh] Start script for running r.avaflow [EXPERT] (Version 1.0) for the Acheron rock avalanche
[ac_project] Project for r.avaflow [PROFESSIONAL] (Version 0.8) for the Acheron rock avalanche
View:
Visualization of selected model results

Information on further case studies will be displayed shortly.