USER MANUAL SWAN Cycle III version 40.72A

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72 Chapter 4 • during the computation of the parameters, SWAN adds an analytical (diagnostic) high-frequency tail to the discrete spectrum. • SWAN has an option to only compute within a pre-set directional sector (pre-set by the user). Wave components outside this sector are totally ignored by SWAN (no additions or replacements). This is particularly relevant along the boundaries of SWAN where the user-imposed integral parameters (boundary conditions) may differ from the SWAN-computed parameters. The user is informed by means of a warning in the output (PRINT file) when the computed significant wave height differs more than 10%, say, from the user-imposed significant wave height (command BOUNDSPEC). The actual value of this difference can be set by the user (see the SET command; Section 4.4). | ..........| QUANTity < > ’short’ ’long’ [lexp] [hexp] [excv] & | ..........| [power] (For output quantities PER, RPER and WLEN) & [ref] (For output quantity TSEC) & [fswell] (For output quantity HSWELL) & [fmin] [fmax] (For all integral parameters, like HS, (R)TM01 ...) & |-> PROBLEMcoord | < > (For directions (DIR, TDIR, PDIR) | FRAME | and vectors (FORCE, WIND, VEL, TRANSP)) With this command the user can influence: • the naming of output quantities, • the accuracy of writing output quantities, • the definition of some output quantities and • reference direction for vectors. |...| < > the output parameters are the same as given in command BLOCK. |...| ‘short’ user preferred short name of the output quantity (e.g. the name appearing in
Description of commands 73 ‘long’ [lexp] [hexp] [excv] the heading of a table written by SWAN). If this option is not used, SWAN will use a realistic name. long name of the output quantity (e.g. the name appearing in the heading of a block output written by SWAN). If this option is not used, SWAN will use a realistic name. lowest expected value of the output quantity. highest expected value of the output quantity; the highest expected value is used by SWAN to determine the number of decimals in a table with heading. So the QUANTITY command can be used in case the default number of decimals in a table is unsatisfactory. in case there is no valid value (e.g. wave height in a dry point) this exception value of the output quantity is written in a table or block output. The following data are accepted only in combination with some specific output quantities. [power] [ref] [fswell] [fmin] [fmax] power p appearing in the definition of PER, RPER and WLEN (see Appendix A). Note that the value for [power] given for PER affects also the value of RPER; the power for WLEN is independent of that of PER or RPER. Default: [power]=1. reference time used for the quantity TSEC. Default value: starting time of the first computation, except in cases where this is later than the time of the earliest input. In these cases, the time of the earliest input is used. upper limit of frequency range used for computing the quantity HSWELL (see Appendix A). Default: [fswell] = 0.1 Hz. lower limit of frequency range used for computing integral parameters. Default: [fmin] = 0.0 Hz. upper limit of frequency range used for computing integral parameters. Default: [fmax] = 1000.0 Hz (acts as infinity). PROBLEMCOORD− vector components are relative to the x− and y−axes of the problem coordinate system (see command COORD) − directions are counterclockwise relative to the positive x−axis of the problem coordinate system if Cartesian direction convention is used (see command SET) − directions are relative to North (clockwise) if Nautical direction convention is used (see command SET) FRAME If output is requested on sets created by command FRAME or automatically (COMPGRID or BOTTGRID) − vector components are relative to the x− and y−axes of the frame coordinate system (see command COORD)
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SWAN USER MANUAL SWAN Cycle III ver
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Contents 1 Introduction 1 2 General
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TABLE . . . . . . . . . . . . . . .
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Chapter 1 Introduction The informat
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Chapter 2 General definitions and r
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General definitions and remarks 5 r
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General definitions and remarks 7 I
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which SWAN performs the computation
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General definitions and remarks 11
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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 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: Description of commands 71 [alpn] d
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
Page 111 and 112: File swan.edt 103 ! | -> DEFault !
Page 113 and 114: File swan.edt 105 ! FRAME ’sname
Page 115 and 116: Appendix D Spectrum files, input an
Page 117 and 118: 0.3892E-03 192.0 15.2 0.8007E-03 24
Page 119 and 120: Spectrum files, input and output 11
Page 121 and 122: Spectrum files, input and output 11
Page 123 and 124: Bibliography [1] SWAN - Implementat
Page 125: 117 longitude, 8, 27, 49, 50, 85, 1
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