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Input Files for OASSP

The input files for OASSP are virtually identical to the ones used for computing the mean field using OASP. A few of the options have different significance (s), and the option p is unique to OASSP. In addition, OASSP is unique in terms of allowing for computation of the reverberation from sound speed inhomogeneities in fluid layers. The spatial statistics of the volume inhomogeneities is controlled by the interface roughness parameters for such layers. The input files for OASSP are structured in 8 blocks, as outlined in Table15.

 
Table 15: Layout of OASP input files: 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: SOURCE FREQUENCY
FRC,COFF,IT,VS,VR FRC: Center frequency of source Hz >0
  COFF: Integration contour offset dB/ COFF
  IT: Source pulse type (only for option d)    
  VS,VR: Sou./Rec. velocity (only for option d) m/s  
BLOCK IV: ENVIRONMENT
NL Number of layers, incl. halfspaces - 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 -
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: RECEIVER DEPTHS
RD1,RD2,NRD RD1: Depth of first receiver m -
  RD2: Depth of last receiver m RD2>RD1
  NRD: Number of receiver depths - NR>0
BLOCK VII: WAVENUMBER SAMPLING
CMIN,CMAX CMIN: Minimum phase velocity m/s CMIN>0
  CMAX: Maximum phase velocity m/s -
NW,IC1,IC2,IF NW: Number of wavenumber samples - >0, -1 (auto)
  IC1: First sampling point - IC1
  IC2: Last sampling point - IC2NW
  IF: Freq. sample increment for kernels  
BLOCK VIII: FREQUENCY AND RANGE SAMPLING
NT,FR1,FR2,DT,R1,DR,NR NT: Number of time samples   NT=2M
  FR1: lower limit of frequency band Hz
  FR2: upper limit of frequency band Hz FR1
  DT: Time sampling increment s > 0
  R1: First range km  
  DR: Range increment km  
  NR: Number of ranges   > 0


next up previous contents
Next: Block I: Title Up: OASSP: 2-D Waveguide Reverberation Previous: Transfer Functions
henrik schmidt
1999-08-25