Jun 15, 2004
PROJECT TITLE:
BATHYMETRIC SURVEY OF CEBU HARBOR
CLIENT: CEBU PORT AUTHORITY, PHILIPPINES
LOCATION:
CEBU, PHILIPPINES
DATE: 2004
EGS (Asia) Ltd. has recently completed a detailed bathymetric survey in Cebu, the Philippines, on behalf of Cebu Port Authority (CPA). Work was completed over a 30 day period, starting on 25 January 2004.
To cope with the steadily increasing marine traffic within the Cebu Harbour, CPA has commenced a study on the Cebu Integrated Port Development Plan. As part of master plan of the study, it is essential to carry out a detailed bathymetric survey to map the seabed in great details in order to:
- To update and upgrade existing charts
- To map areas where siltation appears to be taking place
- To create a multi-purpose marine data base
The Survey Vessel; a C-Nav antenna was placed over a known control point to perform the positioning check A coloured Contour plan showing the Cebu harbour and the approaches Using C-View SDMP to provide a 3-D view of a suspect wreck found in the survey
To comply with modern
day international maritime requirement for navigation safety, the International
Hydrographic Organization (IHO) Standards were used as the basis of the
survey specifications. To fulfill this requirement, the majority of the
bathymetric survey used multi-beam echo sounding (MBES) technique while
shoals, wrecks and shallow water areas were filled in using the conventional
single beam echo sounding technique
The survey area covers the narrow and busy Cebu Harbour in the center
and the coverage extends to both the northeast and southwest entrances
down to water depth greater than 100m. During the survey EGS acquired
a total of 1,400 km multi-beam echo sounding (MBES) and 50 km of single
beam echo sounding (SBES) data over a study area of 3,700 hectares. Key
equipment and software used:
- CNav differential GPS, giving accuracies of +/- 0.3 metres
- C-ViewNav navigation suite
- Seabeam 1180 MBES system
- Knudsen 320M SBES system
- C-View Seabed Data Management Processing software (SDMP)
| The Survey Vessel; a C-Nav antenna was placed over a known control point to perform the positioning check |
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| Click
at the image to enlarge
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| A coloured Contour plan showing the Cebu harbour and the approaches |
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| Click
at the image to enlarge
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| Using C-View SDMP to provide a 3-D view of a suspect wreck found in the survey |
 |
| Click
at the image to enlarge
|