Input Files for RDOAST

The input files for RDOAST are very similar to those of OAST , with the main differences being the extra environmental blocks, and two receiver specifications, one for the marching source/receiver array and contour plots, and one for TL vs range etc. As for OAST, the input file is structured in 12 blocks, as outlined in Tables5 and 6.

Table 5: Layout of RDOAST input files: I. Computational parameters.

Input parameter	Description	Units	Limits
BLOCK I: TITLE
TITLE	Title of run	-	80 ch.
BLOCK II: OPTIONS
A B C	Output options	-	40 ch.
BLOCK III: FREQUENCIES
FR1,FR2,NF,COFF,[V]	FR1: First frequency	Hz	>0
	FR2: Last frequency	Hz	>0
	NF: Number of frequencies		>0
	COFF: Integration contour offset	dB/	COFF
	V: Source/receiver velocity (only for option d)
BLOCK IV: ENVIRONMENT
NSEC	Number of sectors	-	NSEC
NL, SECL	Sector 1: No. layers, length	-, km	NL
D,CC,CS,AC,AS,RO,RG,CL	D: Depth of interface.	m	-
.	CC: Compressional speed	m/s	CC
.	CS: Shear speed	m/s	-
.	AC: Compressional attenuation	dB/	AC
.	AS: Shear attenuation	dB/	AS
	RO: Density	g/cm³	RO
	RG: RMS value of interface roughness	m	-
	CL: Correlation length of roughness	m	CL>0
NL, SECL	Sector 2: No. layers, length	-, km	NL
D,CC,CS,AC,AS,RO,RG,CL			-
.
.
BLOCK V: SOURCES
SD,NS,DS,AN,IA,FD,DA	SD: Source depth (mean for array)	m	-
	NS: Number of sources in array	-	NS>0
	DS: Vertical source spacing	m	DS>0
	AN: Grazing angle of beam	deg	-
	IA: Array type	-	IA
	FD: Focal depth of beam	m	FDSD
	DA: Dip angle. (Source type 4).	deg	-
BLOCK VI: RECEIVERS
RD1,RD2,NR	RD1: Depth of first receiver	m	-
	RD2: Depth of last receiver	m	RD2>RD1
	NR: Number of receivers	-	NR>0
D1,D2,ND:	Depth sampling opt I, T etc.
BLOCK VII: WAVENUMBER SAMPLING
CMIN,CMAX	CMIN: Minimum phase velocity	m/s	CMIN>0
	CMAX: Maximum phase velocity	m/s	-
NW,IC1,IC2	NW: Number of wavenumber samples	-	NW =2^M, -1 (auto)
	IC1: First sampling point	-	IC1
	IC2: Last sampling point	-	IC2NW

Table 6: Layout of RDOAST input files: II. Plot parameters.

Input parameter	Description	Units	Limits
BLOCK VIII: RANGE AXES
RMIN,RMAX,RLEN,RINC	RMIN: Minimum range on plots	km	-
	RMAX: Maximum range on plots	km	-
	RLEN: Length of x-axis for all plots	cm	RLEN>0
	RINC: Distance between tick marks	km	RINC>0
BLOCK IX: TRANSMISSION LOSS AXES (Only for Options A,D,T)
TMIN,TMAX,TLEN,TINC	TMIN: Minimum transmission loss	dB	-
	TMAX: Maximum transmission loss	dB	-
	TLEN: Length of vertical TL axes	cm	TLEN>0
	TINC: Distance between tick marks	dB	TINC>0
BLOCK X: DEPTH AXES (Only for Options C,D)
DUP,DLO,DLN,DIN	DUP: Min. depth for plots	m	-
	DLO: Max. depth for plots	m	-
	DLN: Length of depth axes	cm	DCLN>0
	DIN: Distance between tick marks	m	DCIN>0
BLOCK XI: CONTOUR LEVELS (Only for Option C,f)
ZMIN,ZMAX,ZINC	ZMIN: Minimum contour level	dB	-
(	ZMAX: Maximum contour level	dB	-
	ZINC: Contour level increment	dB	ZINC>0
BLOCK XII: SVP AXES (Only for Option Z)
VLEF,VRIG,VLEN,VINC	VLEF: Wave speed at left border	m/s	-
DVUP,DVLO,DVLN,DVIN	VRIG: Wave speed at right border	m/s	-
	VLEN: Length of wave speed axis	cm	VLEN>0
	VINC: Wave speed tick mark distance	m/s	VINC>0
	DVUP: Depth at upper border	m	-
	DVLO: Depth at lower border	m	-
	DVLN: Length of depth axis	cm	DVLN>0
	DVIN: Depth axis tick mark distance	m	DVIN>0