The Flushing Of The Sediments Near The
Power Intakes In The Dez Reservoir
Author(s)
S. Emamgholizadeh, H. Samaadi Borojeni & M. Bina
Abstract
The Dez Dam was constructed in 1963 on the Dez River with the purpose of
power generation, irrigation, water supply and flood control. It is a double
curvature concrete arch dam with a height of 203 meters and initial storage
capacity of 3315MCM. In this operational period, a sedimentation rate of 15 to
20 MCM/year had caused the sediment level behind the dam to raise up to 12 m
below the power intakes (with a rate of 2 m/year) and the delta front has
progressed 0.5 to 1 km/year towards the dam. Currently, the major issue which
threatens the Dez Dam is the continual accumulation of silt in the reservoir near
the dam. This situation has potential impact on the physical operations at the
dam, including power generation and reservoir operation in general. Thus it is
vital that the sediment level near the power intakes be decreased. Current
research has shown that by using cone flushing via three outlets which are
located at el. 222.7 m within the central blocks of the dam body (129 m below
the full supply level of the reservoir), we can remove nearly 0.3 MCM and draw
down the height of the sediments near the power intake about 13 to 15 m. In
addition a bathymetry of the scour cone after a complete pressure flushing shows
that the submerged slope of the reposed sediments is variable from 45% to 6%.
Keywords: reservoir, sedimentation, flushing, Dez Dam.
1 Introduction
During the past few decades dams and reservoirs have been built with increased
frequency, and even more are under considering or construction. Without dams,
the eroded soil is transported by river flows to the sea. However, when dams are
Keywords
reservoir, sedimentation, flushing, Dez Dam.
Related Book
Other papers in this volume
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