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Debris-flow runout modeling using empirical growth rate equation and previously-calibrated rheological parameters
With the use of a meshless, calibration-based continuum dynamic model DAN3D, an empirical solution for the approximate growth rate derived from a robust regression analysis was examined for the applicability in Gyeonggi province, South Korea. The basal rheological parameters and the growth rate, which are the two types of the critical parameters in the DAN3D model framework for governing the landslide movements and the entrainment of bed material, are required to be user-prescribed or be constrained by trial-and-error back-analysis of previous real landslides. A study area in Icheon city of Gyeonggi province, where several debris-flow events took place within short distances at the same rainfall event in 2013, was selected for both the parameter-calibration and the validation. The calibrated rheological parameters were created by back-analysis of a particular debris-flow event in the study area. In parallel, the regression analysis was performed based on the geomorphological and the geotechnical database of numerous debris-flow events occurred throughout Gyeonggi province in 2011, and as a result, an empirical equation for approximating the growth rate was developed. Finally, by adopting the calibrated rheological parameters and the empirical equation for the approximate growth rate, a predictive modeling was performed on one of the debris-flow events in the study area, adjoining to the event in which the rheological parameters had been calibrated. The results were validated by comparing the modeling outputs to the field observation data.Author(s):
Seung-Rae Lee
Korea Advanced Institute of Science and Technology
Korea, Republic Of
Joon-Young Park
Korea Advanced Institute of Science and Technology
Korea, Republic Of
Seok Yoon
Korea Advanced Institute of Science and Technology
Korea, Republic Of
Nedumpallile Vasu Nikhil
Korea Advanced Institute of Science and Technology
Korea, Republic Of