240
CHAPTER 6. SEDIMENT TRANSPORT MODELS
b. They can adequately deal with complex geometries.
c. They offer advantages in measurement and visualization of
the processes when dealing with small-scale versions of the
system.
Bijker (1967) stated that “...a (physical) model can act as a means
to guide the considerations of the engineer in charge of the design of the
project;” but he also cautioned, in reference to movable-bed models, “... the
model is a rather dangerous tool in the hands of a not very cautious and
conscientious investigator. ”
Kamphuis (1985) elaborated on this theme by saying,
The design, construction and operation of even the simplest
coastal movable-bed model requires an ‘expert’ who not only understands scale effects, but also their interactions. When such a
model study is performed, the testing procedures, interpretation
of model results and extrapolation to the prototype all require
much subjective input by an experienced expert. This leaves hydraulic modeling of coastal phenomena as much an art as a
science.
Le Méhauté (1976) echoed the thoughts of earlier and more recent
investigators who utilize movable-bed models when he pointed out that
“... Movable-bed scale models best illustrate the differences between similitude as an art and similitude as a formal science.”
6.1.2 Problems Addressed by Movable-Bed Models
Movable-bed models, as the name implies, have a bed composed of material
that can react to the applied hydrodynamic forces. And it is the responsibility of the model engineer to design a model in which sediment response
is similar to what would occur in the prototype under similar conditions.
Because scale effects in movable-bed models are not as well understood as
those in fixed-bed models, movable-bed model results must be carefully reviewed in the context of previous, similar models that have demonstrated
success in reproducing prototype bed evolution.
Movable-bed models can be used to investigate the effects of coastal
or offshore structures on shoreline evolution, stability of beach modifications, and design of coastal structures to prevent erosion. They can also be
used to investigate the layout of functional structures with the purpose of
minimizing coastal erosion and harbor sedimentation (Oumeraci 1984).
Two-dimensional movable-bed models conducted in wave flumes are
used primarily to study onshore/offshore sediment transport under the ef-
CHAPTER 6. SEDIMENT TRANSPORT MODELS
b. They can adequately deal with complex geometries.
c. They offer advantages in measurement and visualization of
the processes when dealing with small-scale versions of the
system.
Bijker (1967) stated that “...a (physical) model can act as a means
to guide the considerations of the engineer in charge of the design of the
project;” but he also cautioned, in reference to movable-bed models, “... the
model is a rather dangerous tool in the hands of a not very cautious and
conscientious investigator. ”
Kamphuis (1985) elaborated on this theme by saying,
The design, construction and operation of even the simplest
coastal movable-bed model requires an ‘expert’ who not only understands scale effects, but also their interactions. When such a
model study is performed, the testing procedures, interpretation
of model results and extrapolation to the prototype all require
much subjective input by an experienced expert. This leaves hydraulic modeling of coastal phenomena as much an art as a
science.
Le Méhauté (1976) echoed the thoughts of earlier and more recent
investigators who utilize movable-bed models when he pointed out that
“... Movable-bed scale models best illustrate the differences between similitude as an art and similitude as a formal science.”
6.1.2 Problems Addressed by Movable-Bed Models
Movable-bed models, as the name implies, have a bed composed of material
that can react to the applied hydrodynamic forces. And it is the responsibility of the model engineer to design a model in which sediment response
is similar to what would occur in the prototype under similar conditions.
Because scale effects in movable-bed models are not as well understood as
those in fixed-bed models, movable-bed model results must be carefully reviewed in the context of previous, similar models that have demonstrated
success in reproducing prototype bed evolution.
Movable-bed models can be used to investigate the effects of coastal
or offshore structures on shoreline evolution, stability of beach modifications, and design of coastal structures to prevent erosion. They can also be
used to investigate the layout of functional structures with the purpose of
minimizing coastal erosion and harbor sedimentation (Oumeraci 1984).
Two-dimensional movable-bed models conducted in wave flumes are
used primarily to study onshore/offshore sediment transport under the ef-