BODC FIXED STATION DOCUMENT NO. 63864 Site History : Port Elizabeth, South Africa =========================================== Station name : Port Elizabeth Latitude: 33 57.6S Country : South Africa Longitude: 025 37.8E 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: Comment: Residuals are extremely noisy. Large spikes > 20cm and chart reading errors have been flagged. Most questionable fluctuations are related to timing errors. Possible datum shift of +15cm on 29th June 1979 Possible datum shift of +20cm on 13th August 1979 Possible datum shift of +50cm on 31st July 1990 COMPLETENESS QUESTIONABLE FLUCTUATIONS (In day Nos.) YEAR INDEX (%) 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