Investigating the causes of scouring downstream of stilling basin of Shohada diversion dam and proposing suitable solutions to control it

Document Type : Research Paper


1 M. Sc. Student of Water and Hydraulic Structures, Behbahan Khatam Alanbia University of Technology.

2 Associate Professor, Faculty of Engineering, Behbahan Khatam Alanbia University of Technology.

3 Professor, Faculty of Water Sciences Engineering, Shahid Chamran University of Ahvaz.

4 Assistant Professor, Faculty of Natural Resources, Behbahan Khatam Alanbia University of Technology.


Shohada diversion dam was constructed on the border of agricultural lands of Behbahan plain (Khuzestan province, Iran) to divert the water of the Maroun River. This dam has a concrete-soil composite. The concrete part consists of an ogee spillway, a stilling basin, and two intake channels and sediments on the right and left sides. The height of the dam is 12.2 meters and its spillway length is 150 meters. The dam has a sloping basin and its capacity is 22 m3/sec. The longitudinal slope of this basin is 1 to 5 (vertical: horizon). The studies have shown that parts of downstream of the stilling basin are being eroded and scoured. Unless controlled properly, this will continue and might lead to the destruction of the basin or the main structure of the dam. Most of the stilling or apron basins used in the previous studies are horizontal and smooth, and no research has been conducted on scouring downstream of sloping basins so far. Therefore, the purpose of this research is to explore the causes of scouring downstream of the Shohada dam's stilling basin and its controlling factors to finally provide an appropriate strategy to prevent its spread.


Main Subjects

1-       Balachandar, R., Kells, J. A. and Thiessen, R. J. 2000. The effect of tailwater depth on the dynamics of local scour. Canadian Journal of Civil Engineering, 27: 138-150.
2-       Catakli, O., Ozal, K., Tandogan, A. 1973. A study of Scours at end of stilling basin and use of horizontal beams as energy dissipators. 11-th Congress of Large Dams, Madrid. Q41 R2: 23-37.
3-       Dargahi, B. 2003. Scour downstream of a spillway. Journal of Hydraulic Research, 41(4): 417-426.
4-       Dey, S and Sarkar, A. 2006. Scour downstream of an apron due to submerge horizontal jets. Journal of Hydraulic Engineering, 132(3): 246 – 257.
5-       Dezab Consulting Engineering Company Report No 2004286, 2003. Calibration of Irrigation gates of Shohada and Jayzan diversion dams. (In Persian).
6-       Farhoodi, J and Smith, K. 1985. Local scour profile downstream of hydraulic jump. Journal of Hydraulic Research 23(4): 343-359.
7-       Hamidifar, H. and Omid, M. H. 2010. Noncohesive Sediment Scour Downstream of an Apron. Journal of Agricultural Engineering Research, 11(2): 17-28. (In Persian)
8-       Mahmoudian Shooshtari, M. 2008. Principles of flow in open channels. First volume. Second edition. Shahid Chamran University of Ahvaz Publications. (In Persian)
9-       Novak, P. 1955. Study of stilling basin withspecial regard to their end sill. Proceeding of 6th IAHR Conference, The Hague, paper C15.
10-   Novak, P. 1961. Influence of bed load passage on scour and turbulence downstream of stilling basin. Proceeding of 19th IAHR Conference, Dubrovink: 66-75.
11-   Oliveto, G. 2013. Local scouring downstream of a spillway with an apron. Proceedings of the Institution of Civil Engineers. 166. 254-261.
12-   Shafai-Bajestan, M. 2004. Sediment Hydraulic. Third edition. Shahid Chamran University of Ahvaz Publications. (In Persian)
13-   Shafai-Bajestan, M. 2013. Basic theory and practice of hydraulics of sediment transport. Shahid Chamran University press. Ahvaz. Iran.
14-   Shafai-Bajestan, M., Omidi, S. 2016. Investigation of Scour Depth Downstream of Stilling Basin for the Case of B-Jump. Irrigation Sciences and Engineering, 38(4), 125-136. (In Persian)
Volume 43, Issue 1
March 2020
Pages 1-14
  • Receive Date: 17 May 2017
  • Revise Date: 04 October 2017
  • Accept Date: 08 October 2017
  • First Publish Date: 20 March 2020