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Welcome to the landslide_runout_corominas wiki!
This program allows a user to estimate landslide runout from input variables such as landslide transport mechanism, landslide path characteristic, height of the landslide source, and volume of the landslide. The parameters used in the equations are derived from the linear regression of log(V) against log(H/L), where V is the volume of the landslide, H is the height of the landslide source, and L is the landslide runout (Corominas, 1996).
In order to determine which regression equation to use, the user selects the most appropriate transport mechanism and path characteristic for the particular landslide being studied. Guidelines for determining these parameters are discussed in (Corominas, 1996).
Landslide volume is estimated from the area and mean thickness of the landslide mass. Area is determined from the landslide boundary features mapped in the field. Thickness may be estimated from depth of tension cracks, height of landslide scarps, or other indirect means. Due to a greater uncertainty in estimating thickness, the program allows for multiple input values.
The height of the landslide source area is determined from the elevation difference between the main scarp and the exposure nearest to the landslide sourc, or the plain/valley/channel where the landslide is mass is likely to be deposited.
Corominas (1997), in response to a discussion by Hansen (1997), pointed out that the intention of the original paper was to show the linear relation between log(V) and log(H/L), and that the author did not intend to predict H/L from V. Recognizing the interest in using the regression line as a predictive tool, the author expressed his preference to use the line bounding the lowest values of H/L. Such line would represent the maximum value of the runout which is of more practical value, in terms of hazard assessment, than the most probable value.
In the program, the regression line and the corresponding lower bound of the 95% confidence interval are used to estimate the most probable and the maximum value of the runout, respectively.
#Exposure analysis Exposures of households or critical facilities are also analyzed in the program. The location of the household or critical facility nearest to the landslide source is plotted along the runout profile to visually indicate whether these elements will be exposed to the landslide hazard. Critical volume, thickness and area for runout reaching the exposed elements are also computed.
#Disclaimer The program is simply a code implementation of the work of Corominas (1996). Program author will not be liable to any loss or damage to lives or properties arising from the use of this program.