Esperance (Australia) Site History

History Summary

Station Name Esperance
Latitude 33° 52.0' S
Longitude 121° 54.0' E
Country Australia
GLOSS No. 054
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.

Auxiliary Benchmarks

Benchmark Description
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.

Benchmark Relationships

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)

Quality Assessment

Comments

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.

Year Completeness
Index (%)
Questionable Fluctuations(in day Nos.)
and Missing Data (Gaps >6 hours)
1990 99 None
Gap from 1990/06/08 at 10.00 to 1990/06/11 at 00.00
1991 99 None
Gap from 1991/07/30 at 00.00 to 1991/08/01 at 23.00
1992 100 None
1993 100 None
1994 100 None
4 Gaps of <=6 Hours Spanning a Total of 4 Hours
1995 100 None
1996 100 None
1997 100 None
1998 92 None
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
1999 100 None
2000 63 None
Gap from 2000/03/20 at 00.00 to 2000/08/03 at 06.00
2001 99 323
Gap from 2001/08/13 at 04.00 to 2001/08/14 at 06.00