Tide Gauge Records, Casey, Australian Antarctic Territory
Tides are measured using a submerged pressure type gauge secured in a heavy concrete mooring at Casey.\nTidal records are retrieved from the gauge using an inductive loop lowered through a hole in the ice hence the gauge has been undisturbed since it was deployed.\n \nDocumentation dated 2001-03-07...
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| Format: | Dataset |
| Language: | unknown |
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data.gov.au
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| Online Access: | https://researchdata.edu.au/tide-gauge-records-antarctic-territory/1931475 http://data.gov.au/dataset/c9afe977-8fd9-4baf-890f-2ec5d1d04a11 |
| Summary: | Tides are measured using a submerged pressure type gauge secured in a heavy concrete mooring at Casey.\nTidal records are retrieved from the gauge using an inductive loop lowered through a hole in the ice hence the gauge has been undisturbed since it was deployed.\n \nDocumentation dated 2001-03-07 \nCasey Submerged Tide Gauge\n\nThe gauge used at Casey was designed in 1991/2 by Platypus Engineering, Hobart, Tasmania.\nIt was intended to be submerged in about 7 metres of water in a purpose made concrete mooring in the shape of a truncated pyramid.\nThe gauge measures pressure using a Paroscientific Digiquartz Pressure Transducer with a full scale pressure of 30 psi absolute. The accuracy of the transducer is 1 in 10,000 of full scale over the calibrated temperature.\nThe overall accuracy of the system is better than +/- 3 mm for a known water density.\nData is retrieved from the gauges by lowering a coil assembly on the end of a cable over a projecting knob on the top of the gauge and by use of an interface unit, a serial connection can be established to the gauge. Time setting and data retrieval can be then achieved.\nOne of these of these gauges was deployed at Casey in early 1992 in a mooring in Geoffrey Bay. \nThe mooring was apparently moved by sea ice and was later found, but the gauge is missing.\nA new mooring, one which was originally made for Harry Burton for use in one of the Vestfold Hills lakes, was taken by ship to Casey and was placed in Geoffrey Bay using a collection of 200 litre fuel drum to float the mooring into position.\nA new gauge was deployed in March 1996.\nThe gauge was lowered into position with the holding grab wired closed to check that the device fitted in the mooring. The gauge became jammed so was left in situ with the grab preventing access to downloading. In April that year Roger Handsworth attached weights to the floating ropes of the grab to sink them out of the way of the freezing surface water.\nDivers located the mooring and gauge in late 1997 and 22 months of tidal ... |
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