بررسي اثر تغيير كاربري اراضي بر سيلخيزي با استفاده از مدل NRCS مطالعه موردي در حوزه باراندوزي چاي در آذربايجان غربي

Land Use Change Effects on Potential Flooding, Using NRCS Model (Case Study: Barandoozchay Basin

Land use transfer from range and forest to farm and orchard that has recently occurred in many parts of Iran has brought about change in water regime in many different river basins. The same has happened in the study area in Barandoozchay catchment with an area of 1146 km2, located in northwestern Iran. In this region during a 45 years period (1334 - 1379 for which air photographs and satellite images are available) the dry farming areas increased from 4528 to 20231 ha. In this study, after an interpretation of air photographs and satellite images the old and current land use maps have been prepared. NRCS model along with HEC _HMS software were used to simulate rainfall-runoff in the catchment area. Results indicate that the flood in new period increased up to %70 during the studied period, but the extent in increase in peak discharge became tower for the higher return periods.