A Sheet Flow Model To Estimate The Sediment
Transport Rate For Beaches Backed By Seawalls
Author(s)
M. Shakeri Majd, M. A. Lashteh Neshaei & M. Taleghani
Abstract
To consider the effect of reflective structures on coastal sediment transport and
beach morphology, experiments have been performed at laboratory model scale
on a partially reflective seawall located in the surf zone. The main objectives of
these experiments were to measure beach profile evolution on an open beach
with two different sizes of sand and to compare the results with those on a beach
fronting a partially reflective seawall. The results obtained from the profile
evolution measurements in front of reflective seawalls indicate that the extent to
which a seawall affects the processes on the fronting beaches largely depends on
its location relative to the active shore face. A seawall located well landward of
the active shore face will behave in much the same way as a natural beach
whereas seawalls located in the active shore face will modify the near-shore
beach profile because of the effects of reflected waves. A simple sheet flow
model, based on the measured probability density functions of near-bed
horizontal velocities, is developed to predict the short-term response of a
partially reflective structure to random wave attack. The main conceptual
innovation of the model is taking the probability density functions of the
velocities into account and integrating them to calculate the sediment
displacements across the profile using a threshold criterion for initiation of
sediment motion. The results obtained from the model and comparison with the
experimental results are promising and encouraging for further developments of
the preliminary model.
Keywords: coastal sediment transport rate, beach morphology, Probabilistic
Model, seawalls effects.
Keywords
coastal sediment transport rate, beach morphology, Probabilistic
Model, seawalls effects.
Related Book
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