USER MANUAL SWAN Cycle III version 40.72A

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18 Chapter 2 one can perform a SWAN computation without and with the physical process included in the computations, in the latter case using the standard values chosen in SWAN. After it has been established that a certain physical process is important, it may be worthwhile to modify coefficients. In the case of wind input one may at first try to vary the wind velocity. Concerning the bottom friction, the best coefficients to vary are the friction coefficient. Switching off the depth-induced breaking term is usually unwise, since this may lead to unacceptably high wave heights near beaches (the computed wave heights ’explode’ due to shoaling effects). 2.8 Time and date notation SWAN can run for dates (i.e. nonstationary mode) • between the years 0 and 9999, if ISO-notation is used in the input (recommended) or • between the years 1931 and 2030 if two-digit code for years is used (formats 2-6 in every command that contains moments in time). Be careful when nesting SWAN in WAM, since WAM does not use ISO-notation.
Chapter 3 Input and output files 3.1 General SWAN is one single computer program. The names of the files provided by the user should comply with the rules of file identification of the computer system on which SWAN is run. In addition: SWAN does not permit file names longer than 36 characters. Moreover, the maximum length of the lines in the input files for SWAN is 120 positions. The user should provide SWAN with a number of files (input files) with the following information: • a file containing the instructions of the user to SWAN (the command file), • file(s) containing: grid, bottom, current, friction, and wind (if relevant) and • file(s) containing the wave field at the model boundaries (if relevant). 3.2 Input / output facilities To assist in making the command file, an edit file is available to the user (see Appendix C). In its original form this file consists only of comments; all lines begin with exclamation mark. In the file, all commands as given in this User Manual (Chapter 4) are reproduced as mnemonics for making the final command file. Hence, the user does not need to consult the User Manual every time to check the correct spelling of keywords, order of data, etc. The user is advised to first copy the edit file (the copy file should have a different name) and then start typing commands between the comment lines of the edit file. SWAN is fairly flexible with respect to output processing. Output is available for many different wave parameters and wave related parameters (e.g., wave-induced stresses and bottom orbital motion). However, the general rule is that output is produced by SWAN only at the user’s request. The instructions of the user to control output are separated into three categories: 19
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 25: General definitions and remarks 17
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 and 80:
Description of commands 71 [alpn] d
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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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USER MANUAL SWAN Cycle III version 40.72A

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