196
CHAPTER 5. COASTAL STRUCTURE MODELS
figure 5.5: Rubble-Mound Structure Model Under Construction.
to place each armor unit separately while gentle waves were run in the
facility. Whereas this might result in a more realistic version of how the
prototype structure might be built, the time and labor involved in this
construction method may be significantly greater than more conventional
model construction techniques.
Rubble-Mound Model Operation
A carefully prepared model of a rubble-mound structure is only the first
step in conducting a proper model study. Without careful attention to
operation of the model, there is a very real possibility that model results
wi
e erroneous. Several aspects of rubble-mound model operation are
presented below.
Wave simulation in the model is achieved by scaling time series of sea
sur ace e evations that represent design wave conditions, and then converte Jime ser*es
equivalent time series of wave board displacement
wi produce the desired waves. If waves are to be generated and
p opagated over a flat bottom, the transfer functions presented in Chap­