Evaluation the effect of transverse structures on the flood plain using hydraulic model HEC-RAS in Geographic Information Systems (GIS)

Document Type : Research Paper



Rivers have always a significant role in foundation, evolution and development of human civilizations and societies. Along  a river, different organizations construct many longitudinal and transverse hydraulic structures for different purposes that these type of structurs cause many changes in morphology and dynamic of such rivers. In this research  study, the effect of the transverse structures to the flow direction built on BarajinRiver in Qazvin province on flood zone and land uses has been investigated. For this purpose the river plan, longitudinal  river profile and cross sections were provided using topographic and land use maps. In the next step, flood hydraugraphs different and the peak discharges were provided using different methods such as SCS with different return periods. The geometric data of river and its hydraulic structures were then collected using surveying information. HEC-RAS and GIS Softwares, which are popular for river engineering, were applied in this research. Flood mapping zones were provided with and without structures for different return periods. The predicted results were then compared with the
corresponding meansured values and these comparisons showed the accuracy of those softwares.