Stability Analysis Of Dredging
The Flow Sediment Regiment Upstream A Dam
Author(s)
G. Akbari
Abstract
The overall aim of this study was to investigate stability of flow-sediment regime
upstream from a dam, to develop and calibrate a one-dimensional flow-sediment
transport numerical model to deal with the many river-reservoir sedimentation
problems including river reservoir dredging upstream from a dam. The basic
physical principles of the conservation of mass and momentum are used to
describe the fluid flow. The conservation of mass and semi-empirical equations
governing sediment particle movement are adopted to establish the interaction
between the sediment movement and fluid flow. The resulting mathematical
formulation is highly non-linear and complex. It is impractical, if not impossible,
to solve them analytically. Therefore the three governing equations of water
continuity, sediment continuity, and momentum were solved numerically. The
three governing equations were solved in an approximate linear form as well as
in the more complete non-linear form. Also, by ignoring certain terms, the
sediment continuity equation was uncoupled from the other two. Algorithms
were developed for linear or non-linear and coupled or uncoupled solutions.
Keywords: dredging upstream, linear, non-linear, coupled, uncoupled, watersediment
phases.
1 Introduction
In recent years, many major projects have caused serious difficulties as proper
account has not been taken of their relationship with the surrounding
environment. It has been estimated that nearly 14000 mega tonnes of sediment is
carried annually by rivers worldwide and is deposited in man made reservoirs.
This reduces the capacity of reservoirs which leads to an equivalent loss of 6
billion dollars per annum [5]. Dredging river reservoir upstream a dam is a
Keywords
dredging upstream, linear, non-linear, coupled, uncoupled, watersediment
phases.
Related Book
Other papers in this volume
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