Study of contribution role of sub basins in intense flooding; Case Study: Hesarak catchment

Subject Areas : Geopolitic

mohammad mahdi hoseinzadeh ¹ , kazem nosrati ² , sepide imeni ³

1 - Associate Professor of Geomorphology, Faculty of Earth Sciences, Shahid Beheshti University, Tehran
2 - Associate Professor of Geomorphology, Faculty of Earth Sciences, Shahid Beheshti University, Tehran
3 - shahid beheshti

Received: 2015-08-22 Accepted : 2015-12-21 Published : 2016-01-21

Keywords: flooding priority, Sub catchment, Hesarak catchment, HEC- HMS,

Abstract :

One of the most important measures in flood management project to determine the contribution of different components of flood basinswatersheddetermineoutput of basin. Due tolack of hydrometric stations in all outlets sub - basins, achieving this objective requires simulation of rainfall-runoff process in sub-basins using hydrologic models is. Routing and location of sub catchments influence on outlet flood basin. for performance programs flood control in upstream catchments should evaluate the on basins flood and prioritized them according to share of sub catchments in outlet flood of basins. In this study, first for appointment partnership of sub catchments in flood discharge, Hesarak catchment divided to three sub catchments. sub catchments of Hesarak drainage basin ranked due flooding with performance HEC-HMS model. The aim of this study was to estimate the runoff height and outlet flood in sub catchments of Hesarak basin. Results showed rate of sub catchments in peak flow of the basin dosent only on one factor and intersections between factors that determining share of sub catchments in flooding. With performance HEC-HMS model was observed junction of two branches sub catchment had the lowest share and Chapdareh sub catchment had most share in catchments discharge and placed in first priority.