Monthly Summary: DebrisFrame
March 2026
PR #60 (https://github.com/OpenNHM/DebrisFrame/pull/60 ) renames the computational module c1Ti into c1Tif that shortens Thickness Integrated Flow.
Rheological models
PR #1252 (https://github.com/OpenNHM/AvaFrame/pull/1252 ) replaces the bulk dynamic viscosity by the consistency factor K in the Herschel-Bulkley rheological model. The former implementation of the Herschel-Bulkley rheological model assumed that the consistency factor K from the original formulation is equal to the bulk dynamic viscosity. This was not true, so the bulk dynamic viscosity was replaced by the consistency factor K.
PR #1254 (https://github.com/OpenNHM/AvaFrame/pull/1254
) introduces an additional parameter input option for the
Bingham, Herschel-Bulkley and O’Brien and Julien rheological models, making it possible to define the yield shear stress
tauy and the dynamic viscosity eta directly in the configuration file. By default, tauy and eta are used
directly from the configuration file. If either of these two parameters is set to 0, the quantities are computed using
alpha, beta and cv.
PR #62 (https://github.com/OpenNHM/DebrisFrame/pull/62 ) provides a default parameter set for the rheological models that are based on literature research.
Ongoing Work
- The time dependent release and the different debris-flow friction models will be tested on the generic topography
- Sensitivity analysis of friction parameters
- Option to run Debrisframe simulation tools from QGIS
- Literature research and creating a database of friction parameters of back-calculated debris-flow events
Paula, Julian