USER MANUAL SWAN Cycle III version 40.72A

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26 Chapter 4 1 : warnings, 2 : errors (possibly automatically repaired or repairable by SWAN), 3 : severe errors. Default: [maxerr] = 1. [grav] is the gravitational acceleration (in m/s 2 ). Default: [grav] = 9.81. [rho] is the water density ρ (in kg/m 3 ). Default: [rho] = 1025. [inrhog] to indicate whether the user requires output based on variance or based on true energy (see Section 2.5). [inrhog] = 0 : output based on variance [inrhog] = 1 : output based on true energy Default: [inrhog] = 0. [hsrerr] the relative difference between the user imposed significant wave height and the significant wave height computed by SWAN (anywhere along the boundary of structured grid) above which a warning will be given. This relative difference is the difference normalized with the user provided significant wave height. This warning will be given for each boundary grid point where the problem occurs (with its x− and y−index number of the computational grid). The cause of the difference is explained in Section 2.6.3. To supress these warnings (in particular for nonstationary computations), set [hsrerr] at a very high value or use command OFF BNDCHK. Default: [hsrerr] = 0.10. NAUTICAL indicates that the Nautical convention for wind and wave direction (SWAN input and output) will be used instead of the default Cartesian convention. For definition, see Section 2.5 or Appendix A. CARTESIAN indicates that the Cartesian convention for wind and wave direction (SWAN input [pwtail] and output) will be used. For definition, see Section 2.5 or Appendix A. power of high frequency tail; defines the shape of the spectral tail above the highest prognostic frequency [fhigh] (see command CGRID). The energy density is assumed to be proportional to frequency to the power [pwtail]. Default values depend on formulations of physics: command GEN1 : [pwtail] = 5 command GEN2 : [pwtail] = 5 command GEN3 KOMEN : [pwtail] = 4 command GEN3 JANSEN : [pwtail] = 5 If the user wishes to use another value, then this SET command should be located in the command file after the GEN1, GEN 2 or GEN3 command (these will override the SET command with respect to [pwtail]). [froudmax] is the maximum Froude number (U/ √ gd with U the current and d the water depth). The currents taken from a circulation model may mismatch with given water depth d in the sense that the Froude number becomes larger than 1. For this, the current velocities will be maximized by Froude number times √ gd.
Description of commands 27 Default: [froudmax] = 0.8. [printf] unit reference number of the PRINT file. As default, [printf] is equal to 4. If it is changed to 6 all print output will be written to the screen. This is useful if print output is lost due to abnormal end of the program, while information about the reason is expected to be in the PRINT file. [prtest] unit reference number of the test output file. As default, [prtest] is equal to 4. If it is changed to 6 all test output will be written to the screen. This is useful if test print output is lost due to abnormal end of the program, while information about the reason is expected to be in the test output file. |-> STATionary | |-> TWODimensional | MODE < > < > | NONSTationary | | ONEDimensional | With this optional command the user indicates that the run will be either stationary or nonstationary and one-dimensional (1D-mode) or two-dimensional (2D-mode). Nonstationary means either (see command COMPUTE): (a) one nonstationary computations or (b) a sequence of stationary computations or (c) a mix of (a) and (b). The default option is STATIONARY TWODIMENSIONAL. | -> CARTesian | COORDINATES < | -> CCM | > REPeating | SPHErical < > | | QC | Command to choose between Cartesian and spherical coordinates (see Section 2.5). A nested SWAN run must use the same coordinate system as the coarse grid SWAN run. CARTESIAN SPHERICAL all locations and distances are in m. Coordinates are given with respect to x− and y−axes chosen by the user in the various commands. all coordinates of locations and geographical grid sizes are given in degrees; x is longitude with x = 0 being the Greenwich meridian and x > 0 is East of this meridian; y is latitude with y > 0 being the Northern hemisphere. Input and output grids have to be oriented with their x−axis to the East; mesh sizes
Page 1: SWAN USER MANUAL SWAN Cycle III ver
Page 5 and 6: Contents 1 Introduction 1 2 General
Page 7 and 8: TABLE . . . . . . . . . . . . . . .
Page 9 and 10: Chapter 1 Introduction The informat
Page 11 and 12: Chapter 2 General definitions and r
Page 13 and 14: General definitions and remarks 5 r
Page 15 and 16: General definitions and remarks 7 I
Page 17 and 18: which SWAN performs the computation
Page 19 and 20: General definitions and remarks 11
Page 27 and 28: Chapter 3 Input and output files 3.
Page 29 and 30: Chapter 4 Description of commands 4
Page 31 and 32: (h) Commands to write or plot outpu
Page 33: Description of commands 25 ’name
Page 37 and 38: Description of commands 29 mesh. Th
Page 39 and 40: ⎛ ∆f = ⎝−1 + Description of
Page 41 and 42: Description of commands 33 • Easy
Page 43 and 44: Description of commands 35 grids ca
Page 45 and 46: Description of commands 37 y ′
Page 47 and 48: Description of commands 39 [fac]
Page 49 and 50: Description of commands 41 ’(10X,
Page 51 and 52: Description of commands 43 | | East
Page 53 and 54: Description of commands 45 CONSTANT
Page 55 and 56: Description of commands 47 points o
Page 57 and 58: Description of commands 49 CRAY WKS
Page 59 and 60: Description of commands 51 This com
Page 61 and 62: Description of commands 53 | JANSse
Page 63 and 64: Description of commands 55 [Csh3] c
Page 65 and 66: Description of commands 57 [ursell]
Page 67 and 68: Description of commands 59 [slope]
Page 69 and 70: Description of commands 61 [cgmod]
Page 71 and 72: Description of commands 63 < > [lim
Page 73 and 74: Description of commands 65 SIGIMPL
Page 75 and 76: Description of commands 67 ’sname
Page 77 and 78: Description of commands 69 (see bel
Page 79 and 80: Description of commands 71 [alpn] d
Page 81 and 82: Description of commands 73 ‘long
Page 83 and 84: | HSign | | | | HSWEll | | | | DIR
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Description of commands 77 | WLENgt
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Description of commands 79 QP DEPTH
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Description of commands 81 [tbegblk
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Description of commands 83 OUTput [
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Description of commands 85 If SWAN
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Description of commands 87 ACCUR MX
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Appendix A Definitions of variables
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Definitions of variables 91 RPER co
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Definitions of variables 93 WLEN Th
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Appendix B Command syntax B.1 Comma
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Repetitions of keywords and/or othe
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Required data and optional data Com
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Appendix C File swan.edt Below the
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File swan.edt 103 ! | -> DEFault !
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File swan.edt 105 ! FRAME ’sname
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Appendix D Spectrum files, input an
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0.3892E-03 192.0 15.2 0.8007E-03 24
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Spectrum files, input and output 11
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Spectrum files, input and output 11
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Bibliography [1] SWAN - Implementat
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117 longitude, 8, 27, 49, 50, 85, 1
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