Presenting Protection Solutions of Anzali Wetlands with the Modern Watershed Approach

The purpose of the modern watershed study is to use a regional pilot to select an erosion sub-basin and restore it to preserve the downstream wetland. In this research, Alanza watershed, located in the upstream reaches of Anzali wetland, has been selected as a sub-watershed (pilot) with the aim of investigating the effect of mechanical, biological and biomechanical operations on modern watersheds. At first, the location of the construction of the watersheds was determined using field operations. Then, due to the planting of species, structural design and also to study the current status of the flow in the river flow modelling channel, using flow and sediment modelling software (HEC-RAS) was used. Using the HEC-Geo RAS extension in the GIS software, the spatial data related to the shape of the river and its longitudinal slope were entered into the HEC-RAS software, and flood flows analysis was calculated. Finally, research of several modern watershed guard structures approaches, including line contour with so-called Along the lines for gabion dams, Longitudinal stream flooring with gabion and biomechanical structures for Prevent slope erosion, can be designed to Reduce erosion and sediment.