PLOTTLD produces plots of coherent transmission loss versus depth. The user must provide a mode file as computed by KRAKEN .
Files: Name Unit Description Input *.PLP 1 PLot Parameters *.MOD 30 MODe file Output *.PRT 6 PRinT file --------------------------------------------------------- EXAMPLE AND DESCRIPTION OF PLP FILE: 'R' ! OPT (X or R for cart or cyl coords) 999 ! M (number of modes to include) 25.0 ! SD (m) 50.0 ! Receiver range (km) 501 0.0 3750.0 / ! NRCVRS RD(1:NRCVRS) (m) 0.0 4000.0 1000.0 10.0 ! ZMIN ZMAX ZINC (m) ZAXL (cm) 70.0 110.0 10.0 10.0 ! TLMIN TLMAX TLINC (dB) TLAXL (cm) (1) - OPTIONS Syntax: OPTION Description: OPTION(1:1): Source type. 'R' for a point source (cylindrical or R-Z coordinates). 'X' for a line source (cartesian or X-Z coordinates) OPTION(2:2): Dummy variable for consistency with PLOTTLR. OPTION(3:3): Component. '' (null) for pressure. 'H' for Horizontal displacement. 'V' for Vertical displacement. 'T' for Tangential stress. 'N' for Normal stress. (2) NUMBER OF MODES Syntax: M Description: M: Number of modes to use in the field calculation. If this number is larger than the actual number of modes in the mode file it is reduced accordingly. (3) - SOURCE/RECEIVER LOCATIONS Syntax: SD RR NRD RD(1:NRD) Description: SD: Source depth (m ). RR: Receiver range (km). NRD: Number of receivers. RD(): Receiver depths (m). The format of the source/rcvr depth info is an integer indicating the number of receivers followed by real numbers indicating the range of each receiver. Since this data is read in using list-directed I/O you can type it just about any way you want, e.g. on one line or split onto several lines. Also if your depths are equally spaced that you can type just the first and last depths followed by a '/' and the intermediate depths will be generated automatically. (6) - Z AXIS INFO Syntax: ZMIN ZMAX ZINC ZAXL Description: ZMIN: Z minimum (m ). ZMAX: Z maximum (m ). ZINC: Z interval for tick marks (m ). ZAXL: Z axis length (cm). (7) - TRANSMISSION LOSS AXIS INFO Syntax: TLMIN TLMAX TLINC TLAXL Description: TLMIN: TL minimum (dB). TLMAX: TL maximum (dB). TLINC: TL interval for tick marks (dB). TLAXL: TL axis length (cm). If you set TLMIN=TLMAX then the curve is autoscaled.
Figure: Sample output of PLOTTLD: transmission loss vs. depth for the Arctic problem.