Applying Numerical Models to Simulate the Behavior of Rivers in the Vicinity of Road

Construction, repair and maintenance of road and railroad infrastructures are very expensive. The exact knowledge of phenomena that damage the infrastructures, can help to manage the costs. One of the most important phenomena is flood. In recent decades, numerical modelings of occurred flood in the vicinity of roads and railways have been noted. In the present study, one and two-dimensional flow equations are presented and successful models in this field have been investigated. Among the presented models, two superior ones within
one-dimensional and two-dimensional models are investigated more accurately and finally the proposed usages of these models are presented. One of the noticeable results is that
one-dimensional models for overall analysis of a large area are very beneficial when dominant flow can be considered linearly. Although these models can calculate the effect of partial phenomena such as bridges and culverts, but if the details of these phenomenas are important for the project, it is suggested that the two-dimensional and three-dimensional softwares are used with higher capacity. Thus, using two-dimensional models such as CCHE2D, with ability of using different turbulence models and simulation the suspended load and bed load in non-equilibrium state, non-uniform and cohesion and non-cohesion sediments is appropriate. The use of introduced one and two-dimensional models for cases which are totally tree dimensional are not recommended.