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Section II

Estimation of Sediment Trap Efficiency in Reservoirs - an Experimental Study

Authors:

N.M.T.K. Revel ,

University of Peradeniya, LK
About N.M.T.K.

Department of Civil Engineering, B.Sc. Eng. (Hons)

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L.P.G.R. Ranasiri,

University of Peradeniya, LK
About L.P.G.R.
Department of Civil Engineering, B.Sc. Eng. (Hons)
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R.M.C.R.K. Rathnayake,

University of Peradeniya, LK
About R.M.C.R.K.
Department of Civil Engineering, B.Sc. Eng. (Hons)
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K.P.P. Pathirana

University of Peradeniya, LK
About K.P.P.

Professor of Civil Engineering, Department of Civil Engineering

B.Sc. Eng. (Hons.) (Peradeniya), M.Eng., Ph.D., C.Eng., FIE(Sri Lanka), MICE (London)

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Abstract

Reservoir sedimentation has become one of the major problems facing water resources development projects in many countries around the world. However, only a limited number of studies have been reported in this field, particularly addressing the trap efficiency of reservoirs. In addition, even the available studies in this area have considered only few parameters governing reservoir sedimentation. As a result, the available knowledge on trap efficiency is not very well defined. The Brune curve [4] is being widely used for estimating trap efficiency of reservoirs at present, but it has several limitations, as it considers only the reservoir capacity and inflow ratio for estimating the trap efficiency. The objective of this study is to formulate an improved methodology for estimating reservoir sedimentation through laboratory experiments. A small-scale laboratory model was set-up to represent a reservoir and a series of tests were conducted by varying the inflow rate, inflow sediment concentration, reservoir capacity and the outflow rate. The experimental results were compared with values obtained from available theories and it was found that they are not very much in agreement with many of the existing theories which are mostly based on a limited number of parameters. A comprehensive data analysis was performed using dimensional analysis to develop an improved relationship to estimate reservoir sedimentation incorporating many parameters governing the problem. However, the applicability of the proposed method is still limited only to reservoirs with continuous spilling conditions. In addition, only one type of sediment gradation (d50) was used in the experimental runs and thus, the effect of sediment sizes is not well represented in this method. However, the relationship developed in this study could be further improved by conducting more experimental runs by varying few other parameters which have not been considered in the present study.


ENGINEER, Vol. 48, No.02, pp. 43-49 2015
How to Cite: Revel, N.M.T.K. et al., (2015). Estimation of Sediment Trap Efficiency in Reservoirs - an Experimental Study. Engineer: Journal of the Institution of Engineers, Sri Lanka. 48(2), pp.43–49. DOI: http://doi.org/10.4038/engineer.v48i2.6833
Published on 25 Apr 2015.
Peer Reviewed

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