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10. Gibson, S., G. Brunner, S. Piper, and M. Jensen. 2006. Sediment transport computations with HEC-RAS. Proceedings of the Eighth Federal Interagency Sedimentation Conference (8thFISC), April 2-6, Reno, NV,
USA.
11. Lorang, M.S. and G. Aggett. 2005. Potential s0edimentation impacts related to dam removal: Icicle Creek, Washington, U.S.A.
12. USACE. 2010. HEC-RAS River Analysis System, Reference Manual for Version 4.1.0 Report CPD-69, Hydrologic Engineering Center, Davis, CA.
13. Yang, C.T. 1996. Sediment Transport, Theory and Practice, Ottawa University, Mc-Grow Hill, 412p.
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Prediction of the sediment load in the river by HEC-RAS
Azadeh Jabary1, Seyed Ahmad Hosseini2, Amir hamzeh Haghiabi3, Samad Emamgholizadeh4, Abdolkarim Behnia5
Abstract
Estimation of the sediment load which a specific flow is capable to transport, is one of the main topics
of sediment researches. Abhar Rood River is one of the major rivers in Zanjan province which plays a
big role in the agriculture of the region. In the present research, HEC-RAS 4.1 model is utilized to
simulate the sediment hydraulic in Abhar Rood River. For this purpose, 730 sections along 50 km of
Abhar Rood have been prepared by using the DEM map of the river (map scale 1:4000) in Hec-
GeoRas extension of ArcMap, thereafter it was used to introduce the river geometry information to
Hec-RAS model. Also the discharge amount with 25 years return period has been calculated in HYFA
model using the 33 years flooding discharge data which was measured at the Ghorveh hydrometric station and used to simulate hydraulic flow of the Abhar Rood River. After calibrating the model for
hydraulic conditions of the river, sediment boundary condition and bed gradation have been defined in
model. Thereafter the sediment transport capacity of the river was calculated by transport functions at
total cross sections. The comparison between the achieved results and measured data shows that, the Yang equation has minimum error compared with other equations. Therefore Yang equation due to its acceptable results is recommended to recognize the sediment transport capacity potential. In addition, to investigate the erosion and sedimentation status of Abhar Rood River, Hjulstrum and Shields criteria have been utilized. The hydraulic condition of this river shows the erosion status at the whole crosses of the river.
Keywords: Abhar Rood, Erosion, HEC-RAS 4.1, Sedimentation
1. Ph.D Student of Hydro-Structure Engineering, Department of Water Engineering, Lorestan University;
2. Instructor, River Engineering Department, Soil Conservation and Watershed Management Research Institute; [email protected] 3. Associate P
