Determination of Resistance Coefficient in Gravel Bed Rivers (case study: Urmia Shahr-Chay River)

Authors

1 MSc. in Civil Eng., Hydraulic Structures, Dept. of Civil Eng., Faculty of Eng., Urmia University, Iran.

2 Department of Civil Eng., Faculty of Eng., Urmia University

Abstract

Applying the studies of resistance to flow in open channels and rivers with specific properties in order to manage them is necessary. An optimum and proper foresight of resistance to flow has a direct impact on the estimation of flow rate, which is important factors in decision about hydro-project developments. This research work tries to identify items which are influencing on the flow resistance by handling properties of the river in specific intervals. In this study, the best Manning’s coefficient of “Shahar-Chay” river by means of hydraulic characteristics and aggregation of river bed has been estimated. Manning’s coefficient by using several methods and using pictures and properties of a river reach with a specific Manning’s coefficient, by comparing to the river conditions with relative pictures and estimating approximate range of the Manning roughness coefficient has been verified. By preparing 3D drawings from region using Arc-GIS and creating lateral sections using Hec-GeoRas, geometric specifications of “Shahar-Chay” river used as input in order to complete hydraulic simulation of HEC-RAS model. By running the software for different values of Manning’s coefficient and hydraulic specifications output from modeling compared to the hydraulic specifications collected from the river reach area. It is found that the most proper value for the Manning coefficient at “Keshtiban” reach is about 0.032. The results of the present research work reveals that three methods, namely “Chaw”, “Coawn” and “comparison of pictures” are more accurate for estimating Manning’s roughness coefficient in rivers, because of introducing several factors taking into account.

Keywords

References

Andam KS, 2003. Comparing Physical Habit Conditions in Forested and Non-Forested Streams, MSc. Thesis, University of Vermont, Burlington, USA.
Anonymous, 1935. Studies of river bed materials and their movement with special reference to the Lower Mississippi River. Waterways Experiment Station, Vicksburg, Mississippi.
Anonymous, 2011. Guide to Determination the Hydraulic Roughness Coefficient of the Rivers, USGS Office, Report 331-A.
Chen CL and Yen BC, 1992. Power Law of Flow Resistance in Open Channels: Manning’s Formula Revised, in Channel Flow Resistance: Centennial of Manning’s Formula. Pp. 206-240, Water Resources Publication. Colorado, USA.
Gharib M and Mosaedi A, 2003. Flood hazard zonation and assessment (case study: Ramian Suburbs, Iran). Journal of the Iranian Natural Resources 60(3):785-797. (In Persian with English abstract)
Hasanzadeh Vaughan V and Mohammadi M, 2016. A numerical study on stream flow resistance in the rivers with wide bed. Pp. 14-15. Proceedings of the 15th Iranian Hydraulic Conference. 14-15 December, Imam Khomeini University, Qazvin, Iran. (In Persian with English abstract)
Hasanzadeh Vaughan V and Mohammadi M, 2018. An Experimental Investigation of Flow Resistance in Plane Bed Rigid Boundary Channels. Journal of Tarbiat Modares University, 18(6):73-82. (In Persian with English abstract)
Javid S, Mohammadi M, Najarchi M and NajafiZadeh MM, 2018a. Laboratory investigation of flow resistance in composite roughened rectangular open channels. Journal of Fresenius Environmental Bulletin 27(7): 4921-4929.
Javid S, Mohammadi M, Najarchi M and Najafizadeh MM, 2018b. An Experimental study of the effect of roughened boundary on flow resistance in rectangular open channels. Water and Soil Science - University of Tabriz 28(4):95-107. (In Persian with English abstract)
Mohammadi M, 1997. Shape effects and definition of hydraulic radius in Manning equation. International Journal of Engineering, 10(3):127-141. (In Persian with English abstract)
Mohammadi M, 1998. Resistance to flow and the influence of boundary shear stress on sediment transport in smooth rigid boundary channels: PhD Thesis, Submitted to the School of Civil Eng., The University of Birmingham, England.
Mohammadi M, 2002. On the effect shape on resistance to flow in open channels. Pp. 339-348 Proceeding of the International Fluvial Hydraulics Conference. 3-6 September, Louvain-La-Neuve, Belgium.
Mohammadi M, 2005. Shape Effects on Resistance to Flow in a V-shaped Channel. International Journal of Engineering 17 (4):349-357. (In Persian with English abstract)
Mohammadi M, 2008a. Local and global friction factor in a V-shaped bottom channel. International Journal of Engineering 21(4):325-336. (In Persian with English abstract)
Mohammadi M, 2008b. Distribution of local friction factor in flat-bed part-full pipe channels. Pp. 325-336. Proceeding of the XIIIth International Water Resources Association Congress. 1-4 September, Montpellier, France.
Mohammadi M, 2020. Applied Hydraulics, First Edition, Urmia University Press.
Mohammadi M, Mohammad Nejad H and EbrahimNejadian H, 2015. Flow resistance and velocity distribution in channels with triangular cross-section. Journal of Experimental Research in Civil Engineering 2(1):55-66. (In Persian with English abstract)
Mohammadnejad H, Mohammadi M and Manafpour M, 2013. An experimental investigation on flow resistance and velocity distribution in triangular open channels. Proceedings 7th Iranian Congress on Civil Eng. 7-8 May, The University of Sistan-Baluchestan, Zahedan, Iran. (In Persian with English abstract)
Moludi M, 2013. Flow resistance and resistance coefficient in gravel-bed rivers (case study: Urmia Shahar-Chay River), MSc. Thesis, Department of Civil Eng. Urmia University.
Moludi M and Mohammadi M, 2013. Flow resistance coefficient for natural rivers in steady flow (case study: Shahr-Chai River, Urmia), Proceedings 7th Iranian Congress on Civil Eng. 7-8 May, The University of Sistan-Baluchestan, Zahedan, Iran. (In Persian with English abstract)
Mosaedi A and Tavakoli M, 2004. Investigation on the finding of best method for determining Manning roughness coefficient and flood hazard zonation in part of Mid-Atrak river (Maraveh). Journal of Agricultural Sciences and Natural Resources 10(4):153-181. (In Persian with English abstract)
Pavlovskii NN, 1931. On the design formula for uniform movement in channels with nonhomogeneous walls. Transactions 3:157-164.
Water and Soil Science
Volume 31, Issue 4
December 2022
Pages 25-37

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