system has undergone substantial testing, revision, and upgrading. T h e s e
enhancementswere of such significance that the present modeling system is
designated as GENESIS Version 2.
The primary enhancements are:
Wave transmission at detached breakwaters.
a.
Capability to specify either a diffracting or nondiffracting groin
b.
or jetty on a lateral boundary.
Inclusion of an arbitrary number of wave sources.
c.
Improvement of the user interface.
d.
Inclusion of warning and input error messages.
e.
PROGRAM APPLICATION:
The GENESIS modeling system is typically applied in the
following manner. An area of interest is defined and a Cartesian coordinate
system is established with the x-axis aligned parallel to the trend
(orientation) of the project shoreline and the y-axis pointing offshore. A
system of equi-spaced grid cells which encompass the project area is estab-
lished, and the project configuration is placed on the grid. The modeling.
system requires 6 input data files and writes its results to 3 output data
files. A summary of the information contained in these files follows.
Initial shoreline positions (relative to the x-axis) at the center of
each grid cell are digitized (usually from shoreline maps derived from surveys
or aerial photography) and entered into the input file called SHORL. Shore-
line positions corresponding to the known shoreline position at the end of the
simulation.period are specified in the file SHORM. This data allows calcula-
tion of a calibration or verification error which conveniently summarizes in a
single value the degree of agreement between the calculated and measured
Offshore wave height, period, and direction of propagation,
shorelines.
together with nearshore wave height and direction (if available) are specified
in another input file called WAVES.
If nearshore wave height and direction
data are available (typically obtained from an external wave transformation
model such as RCPWAVE; see CETN-I-42) the depths at which the nearshore wave
data were saved are specified in the file DEPTH. If a seawall is within the
modeled reach, the position of the seawall (relative to the x-axis) is
specified in the file SEAWL.
The project specification input file and the principal GENESIS interface
is called START; this file contains: (1) model setup including project name,
input length units, number of grid cells, simulation'time step, dates at which
the simulation is to begin and end, the number and date of desired inter-
mediate shoreline position output, and parameters controlling the magnitude of
the longshore sand transport rate; (2) input wave conditions, including wave
height and angle multipliers, depth of the offshore wave data input, avail-
ability of nearshore wave data, (and the number of shoreline grid cells
corresponding to each wave model cell), the time step associated with the
input wave data, number of wave conditions per time step, and the-date at
which the wave data starts; (3) the beach profile, including the effective
grain size (for computing the profile shape), average berm height, and depth
of closure; (4) pondiffracting and diffracting groins and jetties including
the number of each type, their location and length, depth at t h e tip of
diffracting groins (jetties), representative beach slope near the groins
(jetties), and their permeabilities;
(5) detached breakwaters, including the
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