Esperance (Australia) Site History
|Latitude||33° 52.0' S|
|Longitude||121° 54.0' E|
|Time Reference||GMT (00-23 hours)|
|Contributor||1990-1998 National Tidal Facility Flinders University of South Australia|
|Instrument Type||1990-1992 Float and stilling well gauge
1993-present NGWLMS (Acoustic gauge)
|Site of Gauge|
|Observational periods||1965 - 2001|
|Reference level||All data are referred to Tide Gauge Zero (TGZ) and linked into historic fixed benchmarks.|
Tide Gauge Benchmark (TGBM) Description
BM Control - A PWD bronze plaque stamped 'TIDAL BM 1972', set in concrete deck at north west end of No. 1 berth.
|HR4||A PWD bronze plaque in concrete sheet pile copping, No.1 berth.|
|NMV/F/2||Brass rod & identity tag in concrete base of the former front lead beacon.|
|NMV/F/3||Brass rod & identity tag in concrete block at NW corner of silo|
|ESP33A||A standard L&S survey mark with concrete cover plate in cleared foreshore northwest of tide gauge.|
TGZ = Local Chart Datum for both tide gauges, but with varying precision.
TGZ = 3.944m below TGBM 'TIDAL BM 1972'
TGZ = 0.707m below Australian Height Datum (AHD)
The daily or monthly means do not reveal any obvious reference level shifts.
Residuals are extremely noisy and large fluctuations are possibly attributed to the passage of high and low pressure cells across the South coast of Australia.
Since 1992, atmospheric pressure has been measured at the tide gauge site.
|Questionable Fluctuations(in day Nos.)
and Missing Data (Gaps >6 hours)
Gap from 1990/06/08 at 10.00 to 1990/06/11 at 00.00
Gap from 1991/07/30 at 00.00 to 1991/08/01 at 23.00
4 Gaps of <=6 Hours Spanning a Total of 4 Hours
Gap from 1998/02/16 at 00.00 to 1998/02/20 at 00.00
Gap from 1998/03/14 at 00.00 to 1998/03/14 at 23.00
Gap from 1998/09/08 at 00.00 to 1998/10/01 at 06.00
Gap from 1998/11/09 at 00.00 to 1998/11/11 at 02.00
Gap from 2000/03/20 at 00.00 to 2000/08/03 at 06.00
Gap from 2001/08/13 at 04.00 to 2001/08/14 at 06.00