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HYCOM database

Instructions to import sound speed profile data from HYCOM along with GEBCO bathymetry data.

TLDR;

Select a region and time on GEBCO and HYCOM, download .asc and .nc4, and convert to bellhop with MATLAB.

Example

We will download a region and convert the data for use in bellhop.

If you haven't already downloaded the bathymetry example from GEBCO, then do so now.

  1. Select a region and time

The sound speed data since 2018 are available here. Older data may also be available in the older 'experiments'.

alt text

  1. Download the netcdf4 file by clicking the download button.

The download may be a little slow.

  1. In the MATLAB tool, point the GEBCO_FILE_NAME and HYCOM_FILE_NAME variables to your files. For example, to parse the included file:
GEBCO_FILE_NAME = 'gebco_2022_n33.7802_s32.3273_w-119.5189_e-116.992.asc';
HYCOM_FILE_NAME = 'expt_93_ts3z.nc4';

..* Tip - The script projects on the Earth with Mapping Toolbox.

You can also set output files and may want to look closely at how SSP is estimated under land, where HYCOM doesn't have data.

  1. Load into BELLHOP.

At this point, the .bty and .ssp files may be used in Bellhop as usual. There is a sample .env script available that calculates a few rays and shows the format for using the data.