Takoradi (Ghana) Site History
|Latitude||04° 53.0' N|
|Longitude||01° 45.0' W|
|Time Reference||GMT (0-23)|
|Contributor||1983 - 1986 ORSTOM, France
2004 - 2005 National Institute of Oceanography, India
|Originator||2004 - Ghana Survey Department|
|Instrument Type||1983 - 1986 A.Lege, float and stilling well
2004 - Pressure gauge
|Observational Period||1929 - 1992
2004 - 2005
The data are referenced to the zero of the tide staff at Takoradi harbour. The tide staff coincides with Chart Datum.
In the present Sea Level Gauge, a single-crystal silicon thin-diaphragm piezo-resistive strain gauge, manufactured by Honeywell, is used for estimation of water level through measurements of absolute pressure (i.e., water column pressure + atmospheric air pressure).
Conversion of absolute pressure (mbar) to water level with reference to CD consists of the following steps:
- Convert absolute pressure (mbar) to water pressure (mbar).
- Convert water pressure (mbar) to water pressure (dynes/cm2).
- Convert water pressure (dynes/cm2) to water level (cm) above the pressure inlet of the gauge and referencing the latter to CD.
The atmospheric pressure is obtained from either a nearby meteorological station (Takoradi aerodrome) or from measurements using an autonomous weather station [AWS].
The data for 2004 and 2005 are very noisy. Only very bad patches have been flagged.
|Period||Parameter||Missing data||Suspect data||Completeness index (%)||Sample interval|