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| Titel |
EDDA 1.0: integrated simulation of debris flow erosion, deposition and property changes |
| VerfasserIn |
H. X. Chen, L. M. Zhang |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1991-959X
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Model Development ; 8, no. 3 ; Nr. 8, no. 3 (2015-03-27), S.829-844 |
| Datensatznummer |
250116190
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| Publikation (Nr.) |
 copernicus.org/gmd-8-829-2015.pdf |
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| Zusammenfassung |
| Debris flow material properties change during the initiation, transportation
and deposition processes, which influences the runout characteristics of the
debris flow. A quasi-three-dimensional depth-integrated numerical model,
EDDA (Erosion–Deposition Debris flow
Analysis), is presented in this paper to simulate debris flow erosion, deposition
and induced material property changes. The model considers changes in debris
flow density, yield stress and dynamic viscosity during the flow process.
The yield stress of the debris flow mixture determined at limit equilibrium
using the Mohr–Coulomb equation is applicable to clear water flow,
hyper-concentrated flow and fully developed debris flow. To assure numerical
stability and computational efficiency at the same time, an adaptive time
stepping algorithm is developed to solve the governing differential
equations. Four numerical tests are conducted to validate the model. The
first two tests involve a one-dimensional debris flow with constant
properties and a two-dimensional dam-break water flow. The last two tests
involve erosion and deposition, and the movement of multi-directional debris
flows. The changes in debris flow mass and properties due to either erosion
or deposition are shown to affect the runout characteristics significantly.
The model is also applied to simulate a large-scale debris flow in
Xiaojiagou Ravine to test the performance of the model in catchment-scale
simulations. The results suggest that the model estimates well the volume,
inundated area, and runout distance of the debris flow. The model is
intended for use as a module in a real-time debris flow warning system. |
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