Faculty of Civil and Geodetic Engineering, Ljubljana (FGGLJ)
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Two-dimensional debris-flow modelling and topographic data : TXT-tool 3.386-1.1Sodnik, Jošt ; Mikoš, MatjažTwo-dimensional (2-D) debris-flow mathematical modeling is a useful und widely used tool when assessing debris-flow hazard. A high accuracy for 2-D model input parameters is essential for obtaining ... acceptable simulation results, especially for potential debris flows without a recent history of activity. The numerical grid in the debris-flow transport area is usually generated from available topographic data. In Slovenia, DEM5 and DEM12.5 are publicly available data. However, the morphological accuracy of those datasets is questionable because of their development methods and their low resolution. A better solution is using LiDAR-derived data with their higher resolution and a lot of options for further improvements using different methods and algorithms. 2-D debris-flow simulation results using LiDAR data, compared to less accurate DEMs, are more accurate and more useful for debris-flow hazard mapping. The modelled debris-flow depths and velocities are more accurate and better follow field conditions. Although using high-resolution topographic data results in much longer computational time, this shouldn%t be a problem for potential debris flows. For debris-flow endangered and populated torrential fans, modelling of the influence of built structures on flow is important. With adequate numerical modelling of such structures the obtained simulation results are more meaningful, with better expressed local flow conditions. Comparisons using publicly available topographic data sets also show that higher resolution (DEM5 vs. DEM12.5) doesn t always mean better morphologic accuracy.Source: Landslide dynamics : ISDR-ICL landslide interactive teaching tools. Vol. 2, Testing, risk management and country practices (Str. 235-250)Type of material - article, component partPublish date - 2018Language - englishCOBISS.SI-ID - 8348513
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Sodnik, Jošt | 32689 |
Mikoš, Matjaž | 08245 |
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