A Review on Existing Methods to Assess Hydraulic Erodibility Downstream of Dam Spillways

In recent years, rock scouring or erosion downstream of dams has become an increasing dam safety concern. Several theoretical, semi-theoretical, semi-analytical and numerical methods can be used to assess the in hydraulic structures. Semi-theoretical approaches determine correlation between erosive intensity fluid flow resistive capacity rock. Such establish scour thresholds as a function water several mass indices by using situ data curve-fitting approach. some studies, excavatability index, initially developed for stability analysis, was analyse resistance erodibility analysis. The effectivity weight geomechanical parameters are yet determined on basis phenomenon. mechanical interaction water. Four Bollaert et al. important determining plunge pool, but they not applicable case spillways. They comprehensive fracture mechanics closed-end joints, quasi-steady impulsion, dynamic impulsion (DI) blocky erosion. application these each site is necessary identify constants that difficult determine. Few available methods, agent indistinct, hazard parameter spillway surface almost challenging apply. This study comprehensively reviews mechanism assessing risk potential advantages disadvantages all discussed future research directions this domain proposed.