Investigation of abilities and limitations of estimation model of forest roads erosion soil

The forest roads supply accesses to various points in forest in order to timber transportation in forest plans, Silviculture operations, Training and other using of forest. Road construction made a surface without vegetation cover that lead to creation of erosion and sediment in forest area. In order to estimating of erosion and sediment in forest roads, a lot of models has been designed and introduced. This paper investigated of abilities and limitations of estimation model of forest roads erosion soil that has been designed. First the models have been divided in two physical and empirical, then Characteristics data and usable area for each models has been explained. The physical models were explained include WWEP, KINEROS2 and empirical model include ROADMOD، STJ-ERO, SEDMODL ،SEDMODL2, WARSEM, FORECALT and CULSED. Eventually ability and limitation of each model was presented and discussed. Result of this paper showed that number of parameters required, temporal scale, operational area, estimation spatial and type of estimation (erosion and sediment) are the important Characteristics to judging about models. The overall conclusion of this research showed the most fundamental limitations this models include assembling total practicable data unusable for various regions.