American Journal of Civil Engineering 2016; 4(6): 290-297 http://www.sciencepublishinggroup.com/j/ajce doi: 10.11648/j.ajce.20160406.14 ISSN: 2330-8729 (Print); ISSN: 2330-8737 (Online) Prediction of Sediment Deposition in Reservoir Using Analytical Method Rajendra Patil * , Rajeev Shetkar Civil Engineering Department, Government College of Engineering, Aurangabad, India Email address: [email protected] (R. Patil) * Corresponding author To cite this article: Rajendra Patil, Rajeev Shetkar. Prediction of Sediment Deposition in Reservoir Using Analytical Method. American Journal of Civil Engineering. Vol. 4, No. 6, 2016, pp. 290-297. doi: 10.11648/j.ajce.20160406.14 Received: August 23, 2016; Accepted: August 31, 2016; Published: September 18, 2016 Abstract: Sediment particles, a product of erosion in the catchment are transported along the river with flowing water. The construction of Weir, barrage or a dam causes obstruction to the flow resulting in reduction of velocity. The reduced velocity causes sedimentation resulting in reduction of storage capacity which affects the overall life of the reservoir. The sediment deposition in the reservoir is a continuous and complex process which affects the useful life of a reservoir. The quantification of sediment deposition in a reservoir is necessary for effective reservoir and river basin management. The present study has been carried out to assess sediment deposition in Koyna Reservoir which is located in the Western Maharashtra, India. In India most of the rainfall is caused due to the southwest monsoon during the period from June to September, massive convective thunderstorms dominate the weather. In the present study analytical methods are used for estimation of sediment deposited in the Koyna reservoir. For the prediction annual inflow data is used. The storage capacity of Koyna reservoir is calculated considering the loss of storage due to sediment deposition for a period from 1961 to 2375. The results obtained indicated a loss of reservoir capacity by the year 2004, as 267.25 Mm 3 (9.55%). The physical measurement indicated that the Koyna reservoir had lost 293.09 Mm 3 (10.48%) of its capacity by the year 2004. The results obtained by analytical method have 8.82% error compared with the actual measurements. Keywords: Reservoir, Inflow, Sedimentation, Capacity, Deposition 1. Introduction India experiences very high unpredictability in the amount and the pattern of rainfall in various regions of the country. To cope up with such diverse situation, varieties of small and big projects are developed in India. Very few potential sites are to be considered as good sites for the major projects considering all constraints. The available storage capacity of existing reservoirs is to be utilized and evaluated very carefully as good storage sites being limited. The sediment deposition pattern basically affects the storage capacity of the catchment area. Conventional techniques, such as hydrographic surveys and the inflow-outflow methods being used for quantification of sediment deposition in a reservoir are expensive and time consuming. The effect of soil attrition from the catchment, sediment transport and catching efficiency of the reservoir affects the fertility of land. Considering the above issues, development of simple and cost effective method for quantification of sediment deposition in a reservoir is the need of time. The reservoirs capacity is getting decaying due to filling up of sediments year after years. With yearly reduction in capacity by approximately 1%, the overall water storage capacity will become nearly half over a period of about 50 years. The reservoirs especially built for irrigation, water supply and power generation will hamper economics in a great extent and has environmental concerns. In this situation, reduction in the rate of sedimentation or cleaning the reservoirs becomes out most important. Many studies on reservoir sedimentation are going on since 1950s but the prediction phenomenon seems complex due to processes involved. The variables involved in sedimentation process need to be collected are not so reliable affecting the useful life [1]. The estimation of sedimentation depends on variable parameters such as sediments and inflow rates of water, which
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American Journal of Civil Engineering 2016; 4(6): 290-297
http://www.sciencepublishinggroup.com/j/ajce
doi: 10.11648/j.ajce.20160406.14
ISSN: 2330-8729 (Print); ISSN: 2330-8737 (Online)
Prediction of Sediment Deposition in Reservoir Using Analytical Method
Rajendra Patil*, Rajeev Shetkar
Civil Engineering Department, Government College of Engineering, Aurangabad, India
To cite this article: Rajendra Patil, Rajeev Shetkar. Prediction of Sediment Deposition in Reservoir Using Analytical Method. American Journal of Civil
Engineering. Vol. 4, No. 6, 2016, pp. 290-297. doi: 10.11648/j.ajce.20160406.14
Received: August 23, 2016; Accepted: August 31, 2016; Published: September 18, 2016
Abstract: Sediment particles, a product of erosion in the catchment are transported along the river with flowing water. The
construction of Weir, barrage or a dam causes obstruction to the flow resulting in reduction of velocity. The reduced velocity
causes sedimentation resulting in reduction of storage capacity which affects the overall life of the reservoir. The sediment
deposition in the reservoir is a continuous and complex process which affects the useful life of a reservoir. The quantification of
sediment deposition in a reservoir is necessary for effective reservoir and river basin management. The present study has been
carried out to assess sediment deposition in Koyna Reservoir which is located in the Western Maharashtra, India. In India most of
the rainfall is caused due to the southwest monsoon during the period from June to September, massive convective thunderstorms
dominate the weather. In the present study analytical methods are used for estimation of sediment deposited in the Koyna
reservoir. For the prediction annual inflow data is used. The storage capacity of Koyna reservoir is calculated considering the loss
of storage due to sediment deposition for a period from 1961 to 2375. The results obtained indicated a loss of reservoir capacity
by the year 2004, as 267.25 Mm3 (9.55%). The physical measurement indicated that the Koyna reservoir had lost 293.09 Mm
3
(10.48%) of its capacity by the year 2004. The results obtained by analytical method have 8.82% error compared with the actual
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