EDDA 1.0: integrated simulation of debris flow erosion, deposition and property changes
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Published:2015-03-27
Issue:3
Volume:8
Page:829-844
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ISSN:1991-9603
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Container-title:Geoscientific Model Development
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language:en
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Short-container-title:Geosci. Model Dev.
Author:
Chen H. X., Zhang L. M.ORCID
Abstract
Abstract. 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.
Publisher
Copernicus GmbH
Reference57 articles.
1. Alexandrov, Y., Laronne, J. B., and Reid, I.: Suspended sediment concentration and its variation with water discharge in a dryland ephemeral channel, northern Negev, Israel, J. Arid Environ., 53, 73–84, 2003. 2. Akan, A. O. and Yen, B. C.: Diffusion-wave flood routing in channel networks, J. Hydr. Eng. Div.-ASCE, 107, 719–732, 1981. 3. Archfield, S. A., Steeves, P. A., Guthrie, J. D., and Ries III, K. G.: Towards a publicly available, map-based regional software tool to estimate unregulated daily streamflow at ungauged rivers, Geosci. Model Dev., 6, 101–115, https://doi.org/10.5194/gmd-6-101-2013, 2013. 4. Armanini, A., Fraccarollo, L., and Rosatti, G.: Two-dimensional simulation of debris flows in erodible channels, Computat. Geosci., 35, 993–1006, 2009. 5. Bartelt, P., Buehler, Y., Christen, M., Deubelbeiss, Y., Graf, C., McArdell, B., Salz, M., and Schneider, M.: A numerical model for debris flow in research and practice, User Manual v1.5 Debris Flow, WSL Institute for Snow and Avalanche Research SLF, 2013.
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