Port Elizabeth (South Africa) Site History

History Summary

Station name Port Elizabeth
Country South Africa
Latitude 33° 57.6' S
Longitude 025° 37.8' E
GLOSS No. 076
Time Reference GMT (00-23 hours)
Contributor (1973-1996) South African Hydrographic Office
Instrument type (1973-1995) Analog-to-Digital Recorder OTT float-type gauge
(1996-present) SRD acoustic gauge
Site of Gauge  
Observational periods 1973-2000

Reference Level

All data are referred to TGZ and linked into historic fixed benchmarks.

Tide Gauge Benchmark (TGBM) Description

Trig survey BM GPS above tide gauge hut at inshore end of Charl Malan Quay.

UTM Grid Reference 35 HLN 733417

Benchmark Relationships

Tide Gauge Zero (TGZ) = South Africa Chart Datum

TGZ = 0.838m below LLD (MSL) until 31 December 1978

TGZ = 0.900m below LLD (MSL) from 01 January 1979

TGZ = 1.026m below LLD (MSL) from 01 January 1998

TGZ = 5.399m below BM GPS

Quality Assessment

Comments

Residuals are extremely noisy. Large spikes > 20cm and chart reading errors have been flagged. Most questionable fluctuations are related to timing errors.

Following possible datum shifts:

Year Completeness
Index (%)
Questionable Fluctuations (In day Nos.)
and Missing Data (Gaps > 6 hours)
1973 93 Large periods of intermittent timing errors throughout year
    Gap from 1973/03/06 at 11.00 to 1973/03/07 at 05.00
    Gap from 1973/03/09 at 23.00 to 1973/03/12 at 04.00
    Gap from 1973/03/31 at 22.00 to 1973/04/01 at 05.00
    Gap from 1973/04/05 at 22.00 to 1973/04/09 at 05.00
    Gap from 1973/04/09 at 22.00 to 1973/04/10 at 05.00
    Gap from 1973/04/10 at 22.00 to 1973/04/17 at 07.00
    Gap from 1973/04/17 at 23.00 to 1973/04/19 at 06.00
    Gap from 1973/04/27 at 22.00 to 1973/04/30 at 21.00
    Gap from 1973/05/03 at 22.00 to 1973/05/04 at 11.00
    Gap from 1973/05/31 at 22.00 to 1973/12/31 at 21.00
1978 92 168,188-193,197-198,210-211
    Gap from 1978/06/17 at 10.00 to 1978/06/19 at 06.00
    Gap from 1978/06/20 at 00.00 to 1978/06/21 at 06.00
    Gap from 1978/07/03 at 11.00 to 1978/07/04 at 05.00
    Gap from 1978/07/12 at 13.00 to 1978/07/13 at 08.00
    Gap from 1978/07/30 at 06.00 to 1978/07/31 at 08.00
    Gap from 1978/08/07 at 22.00 to 1978/08/14 at 08.00
    Gap from 1978/08/19 at 23.00 to 1978/08/22 at 09.00
    Gap from 1978/09/06 at 07.00 to 1978/09/06 at 13.00
    Gap from 1978/09/07 at 14.00 to 1978/09/11 at 13.00
    Gap from 1978/10/25 at 09.00 to 1978/10/30 at 09.00
    Gap from 1978/11/26 at 23.00 to 1978/11/30 at 21.00
1979 83 114-115
    Gap from 1979/01/25 at 13.00 to 1979/01/26 at 21.00
    Gap from 1979/02/26 at 00.00 to 1979/02/26 at 10.00
    Gap from 1979/03/23 at 07.00 to 1979/03/28 at 09.00
    Gap from 1979/04/07 at 07.00 to 1979/04/17 at 09.00
    Gap from 1979/04/25 at 19.00 to 1979/04/29 at 13.00
    Gap from 1979/05/26 at 22.00 to 1979/05/29 at 07.00
    Gap from 1979/08/20 at 18.00 to 1979/08/22 at 09.00
    Gap from 1979/09/15 at 16.00 to 1979/09/19 at 10.00
    Gap from 1979/10/05 at 19.00 to 1979/11/01 at 06.00
    Gap from 1979/11/04 at 19.00 to 1979/11/07 at 12.00
    Gap from 1979/12/31 at 09.00 to 1979/12/31 at 21.00
1980 97 44-45,58,196-200
    Gap from 1980/03/22 at 12.00 to 1980/03/24 at 21.00
    Gap from 1980/03/26 at 05.00 to 1980/03/28 at 04.00
    Gap from 1980/04/25 at 04.00 to 1980/04/25 at 12.00
    Gap from 1980/05/22 at 23.00 to 1980/05/23 at 14.00
    Gap from 1980/06/23 at 03.00 to 1980/06/23 at 12.00
    Gap from 1980/08/06 at 14.00 to 1980/08/08 at 12.00
    Gap from 1980/08/13 at 22.00 to 1980/08/15 at 06.00
    Gap from 1980/09/10 at 03.00 to 1980/09/11 at 09.00
1981 89 84-85
    Gap from 1981/03/27 at 18.00 to 1981/04/10 at 08.00
    Gap from 1981/05/22 at 06.00 to 1981/05/22 at 12.00
    Gap from 1981/06/02 at 04.00 to 1981/06/12 at 09.00
    Gap from 1981/07/07 at 22.00 to 1981/07/08 at 06.00
    Gap from 1981/07/28 at 10.00 to 1981/08/05 at 13.00
    Gap from 1981/09/01 at 07.00 to 1981/09/02 at 08.00
    Gap from 1981/09/28 at 13.00 to 1981/09/30 at 08.00
    Gap from 1981/10/31 at 10.00 to 1981/11/04 at 06.00
    Gap from 1981/11/19 at 22.00 to 1981/11/20 at 06.00
1982 93 NONE
    Gap from 1982/04/03 at 19.00 to 1982/04/13 at 07.00
    Gap from 1982/12/18 at 13.00 to 1982/12/20 at 10.00
1983 96 NONE
    Gap from 1983/03/08 at 11.00 to 1983/03/11 at 12.00
    Gap from 1983/03/21 at 10.00 to 1983/03/23 at 09.00
    Gap from 1983/04/22 at 23.00 to 1983/04/25 at 13.00
    Gap from 1983/06/04 at 18.00 to 1983/06/07 at 14.00
    Gap from 1983/08/25 at 22.00 to 1983/08/26 at 06.00
    Gap from 1983/09/17 at 12.00 to 1983/09/19 at 06.00
1984 96 47-51,75-76
    Gap from 1984/01/02 at 11.00 to 1984/01/03 at 06.00
    Gap from 1984/02/20 at 20.00 to 1984/02/22 at 11.00
    Gap from 1984/04/13 at 02.00 to 1984/04/13 at 13.00
    Gap from 1984/06/30 at 21.00 to 1984/07/02 at 06.00
    Gap from 1984/07/21 at 11.00 to 1984/07/23 at 06.00
    Gap from 1984/11/13 at 03.00 to 1984/11/14 at 07.00
    Gap from 1984/12/25 at 06.00 to 1984/12/31 at 07.00
1985 100 142,243
1986 97 116,252,304-305,350,364-365
    Gap from 1986/01/12 at 23.00 to 1986/01/14 at 07.00
    Gap from 1986/02/10 at 12.00 to 1986/02/11 at 09.00
    Gap from 1986/04/27 at 16.00 to 1986/04/28 at 14.00
    Gap from 1986/05/24 at 20.00 to 1986/05/26 at 09.00
    Gap from 1986/09/09 at 20.00 to 1986/09/12 at 12.00
    Gap from 1986/12/01 at 23.00 to 1986/12/02 at 12.00
1987 89 2-8
    Gap from 1987/02/26 at 07.00 to 1987/03/02 at 13.00
    Gap from 1987/03/09 at 08.00 to 1987/03/18 at 12.00
    Gap from 1987/05/15 at 18.00 to 1987/05/21 at 09.00
    Gap from 1987/05/31 at 22.00 to 1987/06/02 at 11.00
    Gap from 1987/06/29 at 17.00 to 1987/07/01 at 10.00
    Gap from 1987/07/28 at 11.00 to 1987/07/29 at 06.00
    Gap from 1987/09/19 at 05.00 to 1987/09/23 at 12.00
    Gap from 1987/10/21 at 00.00 to 1987/10/21 at 12.00
    Gap from 1987/11/17 at 19.00 to 1987/11/26 at 13.00
1988 85 43-45
    Gap from 1988/02/14 at 18.00 to 1988/02/16 at 09.00
    Gap from 1988/03/14 at 20.00 to 1988/03/15 at 13.00
    Gap from 1988/03/16 at 14.00 to 1988/03/18 at 07.00
    Gap from 1988/06/04 at 17.00 to 1988/07/04 at 08.00
    Gap from 1988/08/01 at 17.00 to 1988/08/03 at 07.00
    Gap from 1988/09/24 at 13.00 to 1988/09/28 at 10.00
    Gap from 1988/10/16 at 17.00 to 1988/10/17 at 05.00
    Gap from 1988/10/22 at 11.00 to 1988/10/24 at 06.00
    Gap from 1988/10/26 at 07.00 to 1988/10/27 at 07.00
    Gap from 1988/12/21 at 05.00 to 1988/12/31 at 21.00
1989 81 38,73,152-153,171-172,201-202,250,311
    Gap from 1989/02/08 at 02.00 to 1989/02/10 at 09.00
    Gap from 1989/02/14 at 10.00 to 1989/02/15 at 06.00
    Gap from 1989/03/11 at 04.00 to 1989/03/14 at 10.00
    Gap from 1989/03/14 at 20.00 to 1989/03/15 at 06.00
    Gap from 1989/03/15 at 15.00 to 1989/03/21 at 10.00
    Gap from 1989/04/11 at 09.00 to 1989/04/24 at 12.00
    Gap from 1989/05/21 at 08.00 to 1989/06/01 at 21.00
    Gap from 1989/07/20 at 09.00 to 1989/07/20 at 21.00
    Gap from 1989/07/31 at 12.00 to 1989/08/01 at 08.00
    Gap from 1989/08/15 at 07.00 to 1989/08/15 at 13.00
    Gap from 1989/08/16 at 13.00 to 1989/08/17 at 06.00
    Gap from 1989/08/29 at 04.00 to 1989/08/29 at 21.00
    Gap from 1989/08/31 at 22.00 to 1989/09/06 at 21.00
    Gap from 1989/10/05 at 16.00 to 1989/10/09 at 12.00
    Gap from 1989/10/12 at 22.00 to 1989/10/13 at 21.00
    Gap from 1989/11/04 at 23.00 to 1989/11/06 at 09.00
    Gap from 1989/11/13 at 13.00 to 1989/11/14 at 05.00
    Gap from 1989/11/15 at 15.00 to 1989/11/16 at 06.00
    Gap from 1989/12/02 at 04.00 to 1989/12/13 at 07.00
    Gap from 1989/12/18 at 19.00 to 1989/12/21 at 08.00
1990 65 204-209
    Gap from 1990/01/26 at 14.00 to 1990/01/29 at 06.00
    Gap from 1990/02/08 at 11.00 to 1990/02/08 at 21.00
    Gap from 1990/02/25 at 02.00 to 1990/02/26 at 05.00
    Gap from 1990/02/26 at 15.00 to 1990/02/27 at 05.00
    Gap from 1990/03/21 at 22.00 to 1990/03/23 at 11.00
    Gap from 1990/04/03 at 08.00 to 1990/07/13 at 08.00
    Gap from 1990/08/18 at 14.00 to 1990/08/20 at 06.00
    Gap from 1990/08/22 at 14.00 to 1990/08/23 at 05.00
    Gap from 1990/08/24 at 04.00 to 1990/08/24 at 12.00
    Gap from 1990/08/24 at 16.00 to 1990/08/30 at 22.00
    Gap from 1990/08/31 at 22.00 to 1990/11/28 at 13.00
    Gap from 1990/12/22 at 08.00 to 1990/12/31 at 21.00
1991 70 43-90,100-134
    Gap from 1991/01/02 at 22.00 to 1991/01/03 at 15.00
    Gap from 1991/01/29 at 09.00 to 1991/02/05 at 11.00
    Gap from 1991/02/10 at 22.00 to 1991/02/11 at 12.00
    Gap from 1991/02/11 at 14.00 to 1991/02/12 at 10.00
    Gap from 1991/03/31 at 20.00 to 1991/04/10 at 06.00
    Gap from 1991/05/27 at 03.00 to 1991/08/23 at 10.00
    Gap from 1991/09/19 at 22.00 to 1991/09/20 at 12.00
    Gap from 1991/11/11 at 13.00 to 1991/11/12 at 12.00
    Gap from 1991/12/09 at 23.00 to 1991/12/10 at 06.00
1992 76 Large periods of intermittent timing errors throughout year especially 86-91,236-237
    Gap from 1992/01/02 at 06.00 to 1992/01/29 at 21.00
    Gap from 1992/02/26 at 04.00 to 1992/03/26 at 07.00
    Gap from 1992/03/31 at 22.00 to 1992/04/01 at 05.00
    Gap from 1992/04/01 at 07.00 to 1992/04/08 at 21.00
    Gap from 1992/04/24 at 22.00 to 1992/04/25 at 15.00
    Gap from 1992/04/26 at 22.00 to 1992/04/27 at 08.00
    Gap from 1992/05/07 at 18.00 to 1992/05/08 at 08.00
    Gap from 1992/05/09 at 18.00 to 1992/05/10 at 08.00
    Gap from 1992/05/25 at 21.00 to 1992/05/26 at 06.00
    Gap from 1992/06/02 at 22.00 to 1992/06/03 at 05.00
    Gap from 1992/06/23 at 14.00 to 1992/06/24 at 06.00
    Gap from 1992/07/03 at 22.00 to 1992/07/06 at 13.00
    Gap from 1992/07/11 at 18.00 to 1992/07/12 at 06.00
    Gap from 1992/07/17 at 18.00 to 1992/07/18 at 10.00
    Gap from 1992/07/19 at 06.00 to 1992/07/19 at 14.00
    Gap from 1992/07/22 at 09.00 to 1992/07/24 at 08.00
    Gap from 1992/08/21 at 08.00 to 1992/08/21 at 20.00
    Gap from 1992/08/21 at 22.00 to 1992/08/23 at 12.00
    Gap from 1992/09/20 at 16.00 to 1992/09/21 at 06.00
    Gap from 1992/10/20 at 00.00 to 1992/10/20 at 08.00
    Gap from 1992/11/16 at 03.00 to 1992/11/16 at 13.00
1993 82 Large periods of intermittent timing errors throughout year
    Gap from 1993/01/03 at 22.00 to 1993/01/07 at 05.00
    Gap from 1993/01/08 at 04.00 to 1993/01/08 at 10.00
    Gap from 1993/01/10 at 05.00 to 1993/01/11 at 04.00
    Gap from 1993/01/24 at 20.00 to 1993/01/25 at 03.00
    Gap from 1993/02/04 at 12.00 to 1993/02/05 at 04.00
    Gap from 1993/02/09 at 17.00 to 1993/02/10 at 07.00
    Gap from 1993/02/21 at 17.00 to 1993/02/22 at 04.00
    Gap from 1993/03/08 at 13.00 to 1993/03/09 at 04.00
    Gap from 1993/04/03 at 17.00 to 1993/04/04 at 04.00
    Gap from 1993/04/04 at 06.00 to 1993/04/07 at 04.00
    Gap from 1993/05/03 at 17.00 to 1993/05/06 at 21.00
    Gap from 1993/06/18 at 03.00 to 1993/06/18 at 17.00
    Gap from 1993/07/14 at 20.00 to 1993/07/15 at 16.00
    Gap from 1993/09/07 at 20.00 to 1993/09/08 at 06.00
    Gap from 1993/09/16 at 15.00 to 1993/09/18 at 03.00
    Gap from 1993/10/16 at 22.00 to 1993/12/02 at 09.00
1994 56 Large periods of intermittent timing errors throughout year especially 204,233-237,240-241
    Gap from 1994/01/05 at 18.00 to 1994/02/27 at 21.00
    Gap from 1994/03/02 at 16.00 to 1994/03/08 at 09.00
    Gap from 1994/03/28 at 20.00 to 1994/03/29 at 05.00
    Gap from 1994/03/30 at 22.00 to 1994/05/06 at 05.00
    Gap from 1994/05/31 at 03.00 to 1994/05/31 at 21.00
    Gap from 1994/05/31 at 23.00 to 1994/06/01 at 09.00
    Gap from 1994/06/17 at 22.00 to 1994/07/04 at 08.00
    Gap from 1994/07/30 at 02.00 to 1994/07/30 at 21.00
    Gap from 1994/07/30 at 23.00 to 1994/08/21 at 08.00
    Gap from 1994/08/25 at 14.00 to 1994/08/28 at 15.00
    Gap from 1994/08/29 at 22.00 to 1994/08/30 at 09.00
    Gap from 1994/09/25 at 09.00 to 1994/09/28 at 12.00
    Gap from 1994/10/25 at 18.00 to 1994/10/26 at 06.00
    Gap from 1994/11/22 at 22.00 to 1994/12/06 at 21.00
    Gap from 1994/12/15 at 22.00 to 1994/12/16 at 21.00
    Gap from 1994/12/30 at 22.00 to 1994/12/31 at 21.00
1995 65 087,115-118
    Gap from 1995/01/30 at 09.00 to 1995/01/30 at 21.00
    Gap from 1995/01/31 at 02.00 to 1995/01/31 at 08.00
    Gap from 1995/03/28 at 18.00 to 1995/03/29 at 09.00
    Gap from 1995/06/11 at 19.00 to 1995/06/14 at 07.00
    Gap from 1995/06/19 at 03.00 to 1995/06/19 at 20.00
    Gap from 1995/06/19 at 22.00 to 1995/06/20 at 13.00
    Gap from 1995/07/15 at 22.00 to 1995/10/03 at 13.00
    Gap from 1995/10/30 at 22.00 to 1995/12/08 at 06.00
1996 69 246
    Gap from 1996/01/14 at 18.00 to 1996/01/15 at 05.00
    Gap from 1996/02/26 at 06.00 to 1996/02/26 at 17.00
    Gap from 1996/03/08 at 06.00 to 1996/03/08 at 17.00
    Gap from 1996/04/09 at 18.00 to 1996/04/15 at 17.00
    Gap from 1996/05/01 at 00.00 to 1996/05/06 at 17.00
    Gap from 1996/05/27 at 18.00 to 1996/05/28 at 05.00
    Gap from 1996/07/08 at 18.00 to 1996/07/16 at 23.00
    Gap from 1996/07/22 at 06.00 to 1996/08/13 at 05.00
    Gap from 1996/08/19 at 06.00 to 1996/08/25 at 11.00
    Gap from 1996/09/29 at 18.00 to 1996/09/30 at 01.00
    Gap from 1996/10/23 at 06.00 to 1996/10/31 at 23.00
    Gap from 1996/11/11 at 18.00 to 1996/12/31 at 21.00
1997 42 Timing out a fraction of an hour occasionally throughout the year.
    Gap from 1997/01/01 at 00.00 to 1997/06/27 at 06.00
    Gap from 1997/09/18 at 08.00 to 1997/10/23 at 08.00
2000 97 Timing out a fraction of an hour occasionally throughout the year.
    Gap from 2000/10/22 at 10.00 to 2000/11/01 at 12.00