Jumaat, 9 Januari 2009

A hydrographic survey may be conducted to support a variety of activities:

: Nautical charting
: Port and harbor maintenance (dredging)
: Coastal engineering (beach erosion and replenishment studies
: Coastal zone management
: Offshore resource development
: Measurement of tide at sea coast for tidal analysis and prediction
: Determination of direction of current
: To help navigation which can guide the ships to the right and save direction using nautical chart
: Determination of international boundaries within countries separated by the ocean
: To be used in the construction progress of structure in the middle of the open sea (e.g.: oil drilling platform.

The one data type common to all hydrographic survey is water depth. Of additional concern to most surveys is the nature of the sea floor material due to its implications for anchoring, dredging, structure construction, pipeline and cable routing and fisheries habitat. Side scan sonar’s are often deployed to facilitate the detection of submerged dangers navigation. Measurements include the tidal, current and wave information of physical oceanographic. Tide or water level measurements are recorded to provide vertical reference for water depth.

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