2002 Volume 46 Pages 665-670
A serious sediment disaster occurred in the Camuri Grande River basin due to heavy rainfall on December 16, 1999 in Venezuela. In this paper, efficacy of countermeasures such as sabo dams in the ravines and channel works on the fan of the Camuri Grande is evaluated by numerical simulation methods. Efficacy of sabo dams is estimated by using a one-dimensional model, in which a very wide grain-size distribution of the riverbed material as well as several flow types such as a debris flow, an immature debris flow and a turbulent flow is taken into account. Efficacy of channel works is evaluated by using two-dimensional model, where a finite volume method using unstructured meshes is adopted. Efficacy of Sabo facilities are found to be evaluated reasonably by this method.
