number of breakwaters, the location, depth, and distance from the x-axis of
the tips of the breakwaters, and the wave transmission coefficient associated
with each breakwater; (6) seawalls within the modeled reach, including their
locations; and (7) beach fillq to be implemented during the simulation,
including the number of beach fills, dates at which the beach-fill operation
is to begin and end, location of the beach-fill operations, and the added berm
width after adjustment to equilibrium conditions.
Output from the GENESIS modeling system is placed in 3 files called
The output file, SETUP, is written both to the
SETUP, OUTPT, and SHORC.
monitor and to a logical file which can be sent to a printer for a hard copy.
SETUP echoes back to the modeler basic information and instructions entered in
the input file START.
The file OUTPT holds the most significant output data and calculated
results, and includes:
Simulation title and initial shoreline position.
a.
Calculated shoreline position at the dates or time steps specified
b.
by the modeler in the START file.
c.
Volume of sand transported alongshore at each grid cell, expressed
as a volume per unit time interval, i.e., per annum.
Breaking wave height and direction at each grid cell.
d.
e.
Longshore sand transport rate at each grid cell for the last time
step.
f
Calculated shoreline position at the end of the simulation and the
--
seaward-most and landward-most shoreline positions during the
calculation period.
Calculated position of the representative contour used for wave
g.
refraction calculations.
The output file SHORC also contains the calculated shoreline position at
the end of the simulation period.
The format of this file is such that it can
be renamed to SHORL and used as the initial shoreline in a successive simula-
tion. This feature is very useful if the configuration or number of struc-
tures within the model reach changes during the course of the simulation
period.
PROGRAM CAPABILITIES AND LIMITATIONS: The GENESIS modeling system contains
what is believed to be a reasonable balance between present capabilities to
efficiently and accurately calculate coastal sediment transport processes from
engineering data and the limitations in both the data and knowledge of
sediment transport and beach change.
The modeling system and associated
methodology have matured through use in numerous types of projects, and are
expected to continue to mature with more widespread use. The framework of the
system is flexible and will permit enhancements and capabilities to be added
The GENESIS modeling system
in the future as dictated by field office needs.
was designed to describe long-term trends of the beach plan shape in the
course of its approach to an equilibrium form. The shoreline change model.
best calculates shoreline movement in transition from one equilibrium state to
another.
This change is usually caused by a notable perturbation, for
example, by jetties constructed at a harbor or inlet. The modeling system is
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