A Three Years Experience in Sediment Removal from Sefid Rud Reservoir by Chasse Method
Removal of sediment deposits from reservoirs is one of the biggest problems in dam operation around the world. More research is needed to find a practical and economical way of removing deposits. For Sefidrud Dam have been applied the Chasse (Flushing) me
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A THREE YEARS EXPERIENCE IN SEDIMENT REMOVAL FROM SEFID RUD RESERVOIR BY CHASSE METHOD Technical Bureau, Water Affairs, Ministry of Energy, Tehran, Islamic Republic of Iran 1.
INTRODUCTION
Removal of sediment deposits from reservoirs is one of the biggest problems in dam operation around the world. More research is needed to find a practical and economical way of removi~ deposits. For Sefidrud Dam have been applied the Chasse (Flushing) method and obtained encouraging results. The emphasis is on the optimization of the objective function, which is in this case maximization of the sediment volume removed by the available water in the reservoir. In view of the complexity of the pehnomena, optimization through Chasse method is proposed by experiment. This method is applied by releasing high discharges through the bottom outlets using the available water stored in the reservoir. Because of the stability problems of dam structure and others the water level has to be reduced gradually. Therefore the efficiency of sediment removal is reduced. Also the method requires an adequate amount of excess run-off to be available for Chasse operations. :n this paper all experimental results of three years
(1980-82) have been reported for sediment removal of Sefidrud
Dam. 2.
LOCATION AND CHARACTERISTICS OF SEFIDRUD DAM
The Sefidrud Dam was built on the Sefidrud river and situated at 49-23' east and 36-46' north of Iran. The Sefidrud river originates from the confluence of the rivers Ghazel Ozen and Shahrud beside Mengil City. Studies and construction of the dam was started in 1953 and completed in 1961. The width of the Sefidrud valley on the dam site plus the size of the floods and the favourable foundation conditions led to the choice of a buttress gravity dam. K. V. H. Smith (ed.), Channels and Channel Control Structures © Springer-Verlag Berlin Heidelberg 1984
1-236
The height of the dam from the bedrock level is 106 m, and above the river bed 92 m. The width of the dam at the site of the largest buttress is 100 m. The length along the crest of the dam is 425 m. The surface area of the reservoir at 276.25 m above M.S.L. is 56 Km2, and the length of the reservoir at 276.25 m above M.S.L. on the Ghazel Ozen is 25 KIn, and on the Shahrud it is 13 Km. The reservoir capacity is 1.8 x 109 m3 • Discharge arrangements of the dam are as follows: Three irrigation ~ates on the right side of the dam at a level of 191.3 m lM.S.L.) above the sill with a discharge capacity of 430 m3/sec • Two irrigation gates on the left side of the dam at a level of 193.8 m (M.S.L.) with discharge capacity of 550 m3/sec. Two spillway gates at 248.83 m (M.S.L.) with discharge capacity of 2000 m3/sec. Two surface spillways (tulip form) with discharge capacity of 165 m3/sec.
(5) Five turbine pressure pipes with a total discharge capacity of 165 m3/sec.
The power station with five turbogenerators could generate a total of 17500 KY. 3.
H-m>ROLOGY AND TOPOGRAPHY OF THE RIVER BASIN
The Sefidrud river originates from the confluence of the Ghazel Ozen and
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