CMS-Wave Model Parameters

Model Control

CMS-Wave Model Control window.

To setup the model parameters for CMS-Wave:

1. Go to CMS-Wave, Model Control, and turn on Allow wetting and drying and Bed friction (Figure 38),

2. Users can also specify constant or varied forward and backward reflection coefficients in Settings,

3. Water level and wind information are optional source as specified under Wave Source in addition to the spectral input data,

4. File, Save As, Wave.sim (selecting the Save As Type as

CMS-Wave Model Control File

The *.std has a maximum of 24 parameters - the first 15 parameters are more the basic ones as described in the CMS-Wave Technical Report (CHL-TR-08-13) while the remaining 9 parameters are relatively new for advanced CMS-Wave features.

Table 1. CMS-Wave parameters in STD file

Number	Variable	Argument Type	Options/Range	Description
1	iprp	INTEGER	0 - waves and wind input in *.eng 1 - waves only, neglect wind input in *.eng -1 - fast mode 2 - forced grid internal rotation 3 - without lateral energy flux	Wave propagation mode.
2	icur	INTEGER	0 - no current input 1 - with current input *.cur 2 -with *.cur, use only the 1st set current data	Current interaction
3	ibk	INTEGER	0 - no wave breaking output 1 - output breaking indices 2 - output energy dissipation rate	Wave breaking output option
4	irs	INTEGER	0 - no wave radiation stress calculation or output 1 - calculate and output radiation stresses 2 - calculate and output radiation stresses plus setup/max-water-level	Radiation stress and runup options.
5	kout	INTEGER	>= 0	Number of special wave output location, output spectrum in *.obs and parameters in selhts.out
6	ibnd	INTEGER	0 - no input a parent spectrum *.nst 1 - read *.nst, averaging input spectrum 2 - read *.nst, spatially variable spectrum input	Nesting option.
7	iwet	INTEGER	0 - allow wet/dry, default 1 - without wet/dry -1 allow wet/dry, output swell and local sea files -2 - output combined steering wav files -3 - output swell, local sea, and combined wav files	Wetting and drying options.
8	ibf	INTEGER	0 - no bottom friction calc 1 - constant Darcy-Weisbach coef, c_f 2 -read variable c_f file, *.fric 3 - constant Mannings n 4 - read variable Mannings n file, *.fric	Bottom friction option.
9	iark	INTEGER	0 - without forward reflection 1 - with forward reflection	Forward reflection option.
10	iarkr	INTEGER	0 - without backward reflection, 1 - with backward reflection	backward reflection option.
11	akap	REAL	0.0<=akap<=4.0	Diffraction intensity coefficient.
12	bf	REAL	>=0	constant bottom friction coef c_f or n (typical value is 0.005 for c_f and 0.025 for Mannings n)
13	ark	REAL	0.0<=ark<=1.0	Constant forward reflection coef, global specification (0 for zero reflection, 1 for full reflection).
14	arkr	REAL	0.0<=arkr<=1.0	Constant backward reflection coef, global specification ( 0 for zero reflection, 1 for full reflection)
15	iwvbk	INTEGER	0 - Goda-extended 1 - Miche-extended 2 - Battjes and Janssen 3 - Chawla and Kirby)	Option for the primary wave breaking formula.
16	nonln	INTEGER	0 - none, default 1 - nonlinear wave-wave interaction	Nonlinear wave-wave interaction
17	igrav	INTEGER	0 - none, default 1 - infra-gravity wave enter inlets	Infragravity waves option.
18	irunup	INTEGER	0 - none, default 1 - automatic, runup relative to absolute datum 2 - automatic, runup relative to updated MWL	Runup option.
19	imud	INTEGER	0 - Mud dissipation on, default 1 - none	Mud dissipation option. The kinematic viscosity is specified in mud.dat in units of m2/sec
20	iwnd	INTEGER	0 - Spatially variable wind on, default 1 - None	Spatially variable wind field option. The winds are specified in wind.dat in units of m/s and in the reference frame of the CMS-Wave grid
21	isolv	INTEGER	0 - GSR solver, default 1 - ADI	Matrix solver for CMS-Wave.
22	ixmdf	INTEGER	0 - output ascii, default 1 - output xmdf 2 - input & output xmdf	XMDF input and output options.
23	iproc	INTEGER	>=0	Number of threads for parallel computing. Optimum number is approximately equal to the total row number divided by 300. Only for isolv = 0.
24	iview	INTEGER	0 - half-plane, default 1 - full-plane	Half-plane/full-plane option. users can provide additional input wave spectrum file wave.spc (same format as the *.eng) along the opposite side boundary an imaginary origin for wave.spc at the opposite corner; users can rotate the CMS-Wave grid by 180 deg in SMS to generate this wave.spc

Among these 24 parameters in *.std, the first 6 parameters are always required in CMS-Wave and the remaining ones starting any parameter after the 6^th will be assigned to the default values if not provided in the *.std. The more specific use and options associated with each of these 1^st to 24^th parameters are given below.

• Full-plane – In this mode, CMS-Wave performs two half-plane runs in the same grid. The first

run is in the half-plane with the principle wave direction toward the shore. The second run is in the seaward half-plane. Upon the completion of the second run, two half-plane results are combined to one full-plane solution. Because the run time for the full-plane is approximately twice of the regular half-plane, users shall consider the full-plane mode only if the full-plane features like wave generation and propagation in a bay or around an island. An example is to run the Shark River wave case, 2009.sim, in the full plane (modify 2009.std).