USER MANUAL SWAN Cycle III version 40.72A

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52 Chapter 4 4.5.4 Physics GEN1 [cf10] [cf20] [cf30] [cf40] [edmlpm] [cdrag] [umin] [cfpm] With this command the user indicates that SWAN should run in first-generation mode (see Scientific/Technical documentation). [cf10] [cf20] [cf30] [cf40] [edmlpm] [cdrag] [umin] [cfpm] controls the linear wave growth. Default: [cf10] = 188. controls the exponential wave growth. Default: [cf20] = 0.59 controls the exponential wave growth. Default: [cf30] = 0.12 controls the dissipation rate, i.e., the time decay scale. Default: [cf40] = 250. maximum non-dimensionless energy density of the wind sea part of the spectrum according to Pierson Moskowitz. Default: [edmlpm] = 0.0036 drag coefficient. Default: [cdrag] = 0.0012 minimum wind velocity (relative to current; all wind speeds are taken at 10m above sea level). Default: [umin] = 1. coefficient which determines the Pierson Moskowitz frequency: σ PM = 2π g [cfpm] /U 10 Default: [cfpm] = 0.13 GEN2 [cf10] [cf20] [cf30] [cf40] [cf50] [cf60] [edmlpm] [cdrag] [umin] [cfpm] With this command the user indicates that SWAN should run in second-generation mode (see Scientific/Technical documentation). The variables are identical to those in the GEN1 command except that [cf50] and [cf60] are added. [cf50] [cf60] controls the spectral energy scale of the limit spectrum. Default: [cf50] = 0.0023 controls the spectral energy scale of the limit spectrum. Default: [cf60] = −0.223
Description of commands 53 | JANSsen [cds1] [delta] | | | GEN3 < --> KOMen [cds2] [stpm] > (AGROW [a]) | | | WESTHuysen | With this command the user indicates that SWAN should run in third-generation mode for wind input, quadruplet interactions and whitecapping. Triads, bottom friction and depth-induced breaking are not activated by this command. See the Scientific/Technical documentation for more information. The option GEN3 KOMEN is default. JANSSEN linear growth : Cavaleri and Malanotte-Rizzoli (1981), activated only if the keyword AGROW is present (see below) exponential growth: Janssen (1989, 1991). [cds1] coefficient for determining the rate of whitecapping dissipation (=C ds /˜s 4 PM). [delta] Default: [cds1] = 4.5. coefficient which determines the dependency of the whitecapping on wave number (mix with Komen et al. formulation). Default: [delta] = 0.5. KOMEN linear growth : Cavaleri and Malanotte-Rizzoli (1981), activated only if the keyword AGROW is present (see below) exponential growth: Komen et al. (1984). [cds2] coefficient for determining the rate of whitecapping dissipation (=C ds ). Default: [cds2] = 2.36e-5. [stpm] value of the wave steepness for a Pierson-Moskowitz spectrum (=˜s 2 PM). Default: [stpm] = 3.02e-3. WESTH nonlinear saturation-based whitecapping combined with wind input of Yan (1987). AGROW [a] if this keyword is used, the wave growth term of Cavaleri and Malanotte (1981) is activated. if this keyword is NOT used, the wave growth term of Cavaleri and Malanotte (1981) is NOT activated. Note that in nonstationary runs SWAN start with INIT ZERO (see command INIT), wave energy remains zero unless wave energy penetrates over the boundary or AGROW is activated. In case of stationary runs, however, SWAN will start with a first guess. if the wave growth term of Cavaleri and Malanotte (1981) is activated, [a] is the proportionality coefficient in that term. Default: [a] = 0.0015. WCAPping CSM [cst] [pow]
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SWAN USER MANUAL SWAN Cycle III ver
Page 5 and 6:
Contents 1 Introduction 1 2 General
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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 and 34: Description of commands 25 ’name
Page 35 and 36: Description of commands 27 Default:
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: Description of commands 51 This com
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
Page 85 and 86: Description of commands 77 | WLENgt
Page 87 and 88: Description of commands 79 QP DEPTH
Page 89 and 90: Description of commands 81 [tbegblk
Page 91 and 92: Description of commands 83 OUTput [
Page 93 and 94: Description of commands 85 If SWAN
Page 95 and 96: Description of commands 87 ACCUR MX
Page 97 and 98: Appendix A Definitions of variables
Page 99 and 100: Definitions of variables 91 RPER co
Page 101 and 102: Definitions of variables 93 WLEN Th
Page 103 and 104: Appendix B Command syntax B.1 Comma
Page 105 and 106: Repetitions of keywords and/or othe
Page 107 and 108: Required data and optional data Com
Page 109 and 110: 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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