TR(BR)-1/99-2000 : Modelling of debris flows

Abstract

Literature review on modelling of debris flow is presented in this technical report. Debris flow is a common natural phenomenon. It is associated with high erosion capacity. Modelling of such flow is necessary from engineering point of view. The main difference from other open channel flows is two-fold, (1) flow material is different and (2) flow characteristics are different. Experimental methods are necessary to measure rheological properties and to validate a numerical model. Field measurements of debris flows are difficult. Equations governing the flow are well known. Relation for bed friction is not understood properly. It is estimated based on theological properties of the flowing debris. In the numerical treatment of debris flow, evaluation of bed friction is important. Other features in the numerical modelling are; Error analysis, Validation, Capturing the shock etc. Use of DAMBRK, the popular model for dam break studies, for modelling debris flow is also presented.