USER MANUAL SWAN Cycle III version 40.72A

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28 Chapter 4 CCM QC REPEATING are in degrees. All other distances are in meters. defines the projection method in case of spherical coordinates. CCM means central conformal Mercator. The horizontal and vertical scales are uniform in terms of cm/degree over the area shown. In the centre of the scale is identical to that of the conventional Mercator projection (but only at that centre). The area in the projection centre is therefore exactly conformal. the projection method is quasi-cartesian, i.e. the horizontal and vertical scales are equal to one another in terms of cm/degree. this option is only for academic cases. It means that wave energy leaving at one end of the domain (in computational x−direction) enter at the other side; it is as if the wave field repeats itself in x−direction with the length of the domain in x−direction. This option cannot be used in combination with computation of set-up (see command SETUP). This option is available only with regular grids. Note that spherical coordinates can also be used for relatively small areas, say 10 or 20 km horizontal dimension. This may be useful if one obtains the boundary conditions by nesting in an oceanic model which is naturally formulated in spherical coordinates. Note that in case of spherical coordinates regular grids must always be oriented E-W, N-S, i.e. [alpc]=0, [alpinp]=0, [alpfr]=0 (see commands CGRID, INPUT GRID and FRAME, respectively). 4.5 Model description 4.5.1 Computational grid | -> REGular [xpc] [ypc] [alpc] [xlenc] [ylenc] [mxc] [myc] | | | CGRID < CURVilinear [mxc] [myc] (EXCeption [xexc] [yexc]) > & | | | UNSTRUCtured | | -> CIRcle | < > [mdc] [flow] [fhigh] [msc] | SECtor [dir1] [dir2] | With this required command the user defines the geographic location, size, resolution and orientation of the computational grid in the problem coordinate system (see Section 2.6.3) in case of a uniform, recti-linear computational grid, a curvi-linear grid or unstructured
Description of commands 29 mesh. The origin of the regular grid and the direction of the positive x−axis of this grid can be chosen arbitrary by the user. Must be used for nested runs. Note that in a nested case, the geographic and spectral range (directional sector inclusive) and resolution may differ from the previous run (outside these ranges zero’s are used). REGULAR this option indicates that the computational grid is to be taken as uniform and rectangular. CURVILINEAR this option indicates that the computational grid is to be taken as curvi-linear. The user must provide the coordinates of the grid points with command READGRID COOR. UNSTRUCTURE this option indicates that the computational grid is to be taken as unstructured. The user must provide the coordinates of the vertices and the numbering of triangles with the associated connectivity table with vertices with command READGRID UNSTRUC. [xpc] geographic location of the origin of the computational grid in the problem coordinate system (x−coordinate, in m). See command COORD. Default: [xpc] = 0.0 (Cartesian coordinates). In case of spherical coordinates there is no default, the user must give a value. [ypc] geographic location of the origin of the computational grid in the problem coordinate system (y−coordinate, in m). See command COORD. Default: [ypc] = 0.0 (Cartesian coordinates). In case of spherical coordinates there is no default, the user must give a value. [alpc] direction of the positive x−axis of the computational grid (in degrees, Cartesian convention). In 1D-mode, [alpc] should be equal to the direction [alpinp] (see command INPGRID). Default: [alpc] = 0.0. [xlenc] length of the computational grid in x−direction (in m). In case of spherical coordinates [xlenc] is in degrees. [ylenc] length of the computational grid in y−direction (in m). In 1D-mode, [ylenc] should be 0. In case of spherical coordinates [ylenc] is in degrees. [mxc] number of meshes in computational grid in x−direction for a uniform, recti-linear grid or ξ−direction for a curvi-linear grid (this number is one less than the number of grid points in this domain!). [myc] number of meshes in computational grid in y−direction for a uniform, recti-linear grid or η−direction for a curvi-linear grid (this number is one less than the number of grid points in this domain!). In 1D-mode, [myc] should be 0. EXCEPTION only available in the case of a curvi-linear grid. If certain grid points are to be ignored during the computation (e.g. land points that remain dry i.e. no flooding; saving computer time and memory), then this can be indicated by identifying these grid points in the file containing the grid point coordinates (see command READGRID). For an alternative, see command INPGRID BOTTOM. [xexc] the value which the user uses to indicate that a grid point is to be ignored in the computations (this value is provided by the user at the location of the
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 and 34: Description of commands 25 ’name
Page 35: Description of commands 27 Default:
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
Page 85 and 86: 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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