Simonstown (South Africa) Site History
History Summary
| Station name | Simonstown (Cape Point) |
|---|---|
| Country | South Africa |
| Latitude | 34° 11.3' S |
| Longitude | 018° 26.4' E |
| GLOSS No. | 268 |
| Time Reference | |
| Contributor | (1958-1994) South African Hydrographic Office |
| Instrument type | (1958-1995) Analog-to-Digital Recorder LEA float-type gauge (1995-present) SRD Acoustic |
| Site of Gauge | |
| Observational periods | 1958 - present |
Reference Level
All data are referred to Tide Gauge Zero and are linked into historic fixed benchmarks.
Tide Gauge Benchmark (TGBM) Description
Trig survey BM 28 G. UTM Grid Reference 34 HBT 641144.
Benchmark Relationships
- Tide Gauge Zero (TGZ) = South Africa Chart Datum
- TGZ = 0.651m below LLD (MSL) until 31 December 1978
- TGZ = 0.900m below LLD (MSL) from 01 January 1979
- TGZ = 1.003m below LLD (MSL) from 01 January 1998
- TGZ = 3.739m below BM 28 G
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.
Possible datum shifts:
- +35cm on 6th March 1979
- -20cm on 23rd January 1991
Years marked with * below refer to SRD acoustic gauge.
| Year | Completeness Index (%) | Questionable Fluctuations (In day Nos.) and Missing Data (Gaps > 6 hours) |
|---|---|---|
| 1958 | 100 | None |
| 1959 | 100 | 70,81 |
| 1960 | 100 | 366 |
| 1961 | 100 | 1-3 |
| 1962 | 100 | None |
| 1963 | 100 | 236-237 |
| 1964 | 100 | 87,181-196 |
| 1965 | 99 | None |
| Gap from 1965/12/29 at 22.00 to 1965/12/31 at 21.00 | ||
| 1966 | 100 | None |
| 1967 | 100 | 139-142,160-162,177-183 |
| 1968 | 100 | None |
| 1969 | 100 | None |
| 1970 | 100 | None |
| 1971 | 100 | 6 |
| 1972 | 100 | None |
| 1973 | 100 | None |
| 1974 | 98 | 329-338 |
| Gap from 1974/08/17 at 22.00 to 1974/08/21 at 15.00 | ||
| 1975 | 100 | 319-326 |
| 1976 | 98 | 72-73,280-288,293-296 |
| Gap from 1976/01/04 at 07.00 to 1976/01/04 at 15.00 | ||
| Gap from 1976/03/13 at 22.00 to 1976/03/16 at 21.00 | ||
| Gap from 1976/10/10 at 00.00 to 1976/10/10 at 06.00 | ||
| Gap from 1976/12/26 at 20.00 to 1976/12/27 at 21.00 | ||
| 1977 | 100 | None |
| 1978 | 89 | Large periods of intermittent timing errors throughout year. |
| Gap from 1978/01/24 at 15.00 to 1978/01/31 at 21.00 | ||
| Gap from 1978/02/28 at 09.00 to 1978/03/07 at 08.00 | ||
| Gap from 1978/03/31 at 22.00 to 1978/04/04 at 21.00 | ||
| Gap from 1978/04/11 at 08.00 to 1978/04/18 at 08.00 | ||
| Gap from 1978/05/14 at 22.00 to 1978/05/15 at 21.00 | ||
| Gap from 1978/05/16 at 10.00 to 1978/05/22 at 00.00 | ||
| Gap from 1978/08/18 at 14.00 to 1978/08/19 at 11.00 | ||
| Gap from 1978/08/19 at 15.00 to 1978/08/21 at 13.00 | ||
| Gap from 1978/08/25 at 21.00 to 1978/08/26 at 03.00 | ||
| Gap from 1978/08/28 at 07.00 to 1978/08/28 at 14.00 | ||
| 1979 | 83 | 2-17,201-205 |
| Gap from 1979/01/17 at 22.00 to 1979/01/19 at 21.00 | ||
| Gap from 1979/05/01 at 08.00 to 1979/06/18 at 21.00 | ||
| Gap from 1979/07/10 at 10.00 to 1979/07/17 at 08.00 | ||
| Gap from 1979/09/01 at 23.00 to 1979/09/04 at 08.00 | ||
| Gap from 1979/10/30 at 22.00 to 1979/10/31 at 21.00 | ||
| 1980 | 100 | None |
| 1981 | 100 | 169-185 |
| 1982 | 98 | 150-151 |
| Gap from 1982/12/03 at 09.00 to 1982/12/08 at 08.00 | ||
| 1983 | 82 | None |
| Gap from 1983/04/04 at 17.00 to 1983/04/19 at 10.00 | ||
| Gap from 1983/04/26 at 08.00 to 1983/05/10 at 07.00 | ||
| Gap from 1983/06/07 at 09.00 to 1983/07/05 at 08.00 | ||
| Gap from 1983/07/20 at 08.00 to 1983/07/21 at 13.00 | ||
| Gap from 1983/07/29 at 15.00 to 1983/08/05 at 11.00 | ||
| 1984 | 93 | Intermittent timing errors evident particularly upto the end of July. |
| Gap from 1984/03/19 at 09.00 to 1984/03/19 at 23.00 | ||
| Gap from 1984/03/31 at 09.00 to 1984/04/02 at 12.00 | ||
| Gap from 1984/04/10 at 08.00 to 1984/04/17 at 09.00 | ||
| Gap from 1984/05/15 at 22.00 to 1984/05/23 at 10.00 | ||
| Gap from 1984/07/31 at 10.00 to 1984/07/31 at 21.00 | ||
| Gap from 1984/10/14 at 06.00 to 1984/10/16 at 09.00 | ||
| Gap from 1984/10/18 at 10.00 to 1984/10/23 at 08.00 | ||
| 1985 | 85 | None |
| Gap from 1985/06/07 at 09.00 to 1985/07/30 at 10.00 | ||
| 1986 | 97 | None |
| Gap from 1986/02/26 at 07.00 to 1986/03/03 at 11.00 | ||
| Gap from 1986/05/12 at 10.00 to 1986/05/19 at 06.00 | ||
| 1987 | 82 | 323-330,336-339,363-365 |
| Gap from 1987/07/26 at 01.00 to 1987/07/27 at 06.00 | ||
| Gap from 1987/07/28 at 21.00 to 1987/08/05 at 13.00 | ||
| Gap from 1987/08/20 at 07.00 to 1987/08/24 at 10.00 | ||
| Gap from 1987/08/31 at 08.00 to 1987/09/18 at 07.00 | ||
| Gap from 1987/09/21 at 08.00 to 1987/09/25 at 13.00 | ||
| Gap from 1987/10/06 at 07.00 to 1987/10/12 at 05.00 | ||
| Gap from 1987/12/05 at 22.00 to 1987/12/14 at 09.00 | ||
| Gap from 1987/12/14 at 16.00 to 1987/12/29 at 07.00 | ||
| 1988 | 59 | 19-23,47-53,64-82,96-101,123-126 |
| Gap from 1988/01/13 at 16.00 to 1988/01/18 at 13.00 | ||
| Gap from 1988/01/23 at 09.00 to 1988/01/25 at 08.00 | ||
| Gap from 1988/02/01 at 05.00 to 1988/02/09 at 11.00 | ||
| Gap from 1988/02/22 at 08.00 to 1988/03/04 at 08.00 | ||
| Gap from 1988/03/22 at 15.00 to 1988/03/23 at 07.00 | ||
| Gap from 1988/03/25 at 07.00 to 1988/04/05 at 08.00 | ||
| Gap from 1988/04/13 at 14.00 to 1988/04/14 at 06.00 | ||
| Gap from 1988/04/20 at 09.00 to 1988/05/02 at 09.00 | ||
| Gap from 1988/06/14 at 11.00 to 1988/06/21 at 13.00 | ||
| Gap from 1988/07/04 at 08.00 to 1988/07/18 at 10.00 | ||
| Gap from 1988/08/16 at 13.00 to 1988/08/22 at 07.00 | ||
| Gap from 1988/09/03 at 22.00 to 1988/09/30 at 07.00 | ||
| Gap from 1988/10/01 at 01.00 to 1988/10/04 at 10.00 | ||
| Gap from 1988/10/11 at 07.00 to 1988/11/10 at 11.00 | ||
| Gap from 1988/11/28 at 09.00 to 1988/12/13 at 08.00 | ||
| 1989 | 61 | Large periods of intermittent timing errors throughout year. |
| Gap from 1989/03/31 at 12.00 to 1989/07/07 at 20.00 | ||
| Gap from 1989/07/07 at 22.00 to 1989/08/03 at 21.00 | ||
| Gap from 1989/08/03 at 23.00 to 1989/08/04 at 10.00 | ||
| Gap from 1989/08/09 at 09.00 to 1989/08/23 at 12.00 | ||
| 1990 | 92 | 1-12,347-351 |
| Gap from 1990/05/02 at 17.00 to 1990/05/03 at 02.00 | ||
| Gap from 1990/05/03 at 05.00 to 1990/05/03 at 13.00 | ||
| Gap from 1990/05/03 at 18.00 to 1990/05/04 at 02.00 | ||
| Gap from 1990/05/04 at 08.00 to 1990/05/07 at 14.00 | ||
| Gap from 1990/05/11 at 10.00 to 1990/05/12 at 05.00 | ||
| Gap from 1990/05/12 at 08.00 to 1990/05/13 at 05.00 | ||
| Gap from 1990/05/22 at 16.00 to 1990/05/23 at 09.00 | ||
| Gap from 1990/07/30 at 10.00 to 1990/08/06 at 10.00 | ||
| Gap from 1990/09/04 at 05.00 to 1990/09/06 at 11.00 | ||
| Gap from 1990/11/26 at 09.00 to 1990/12/04 at 10.00 | ||
| 1991 | 86 | 46-50,96-97,102-106,128-135,182-190,302-304 |
| Gap from 1991/01/01 at 16.00 to 1991/01/04 at 08.00 | ||
| Gap from 1991/02/25 at 10.00 to 1991/02/28 at 08.00 | ||
| Gap from 1991/03/19 at 08.00 to 1991/04/02 at 13.00 | ||
| Gap from 1991/06/10 at 08.00 to 1991/06/18 at 07.00 | ||
| Gap from 1991/06/21 at 22.00 to 1991/06/27 at 08.00 | ||
| Gap from 1991/07/09 at 08.00 to 1991/07/11 at 07.00 | ||
| Gap from 1991/12/10 at 09.00 to 1991/12/23 at 08.00 | ||
| 1992 | 87 | 1-6 |
| Gap from 1992/01/06 at 07.00 to 1992/01/21 at 10.00 | ||
| Gap from 1992/02/19 at 08.00 to 1992/03/03 at 14.00 | ||
| Gap from 1992/03/26 at 20.00 to 1992/03/30 at 10.00 | ||
| Gap from 1992/08/07 at 13.00 to 1992/08/11 at 06.00 | ||
| Gap from 1992/10/02 at 07.00 to 1992/10/12 at 09.00 | ||
| Gap from 1992/10/26 at 10.00 to 1992/10/30 at 07.00 | ||
| 1993 | 92 | 191,193,337,344-347 |
| Gap from 1993/08/11 at 13.00 to 1993/08/16 at 10.00 | ||
| Gap from 1993/08/30 at 08.00 to 1993/09/10 at 07.00 | ||
| Gap from 1993/10/15 at 09.00 to 1993/10/19 at 07.00 | ||
| Gap from 1993/11/16 at 10.00 to 1993/11/25 at 08.00 | ||
| Gap from 1993/12/09 at 13.00 to 1993/12/10 at 09.00 | ||
| 1994 | 57 | 188-195 |
| Gap from 1994/02/16 at 22.00 to 1994/02/17 at 07.00 | ||
| Gap from 1994/03/11 at 22.00 to 1994/03/16 at 21.00 | ||
| Gap from 1994/06/06 at 12.00 to 1994/06/06 at 18.00 | ||
| Gap from 1994/06/09 at 08.00 to 1994/07/01 at 06.00 | ||
| Gap from 1994/07/18 at 10.00 to 1994/07/22 at 09.00 | ||
| Gap from 1994/08/03 at 14.00 to 1994/11/03 at 09.00 | ||
| Gap from 1994/11/07 at 09.00 to 1994/12/02 at 08.00 | ||
| Gap from 1994/12/23 at 08.00 to 1994/12/31 at 21.00 | ||
| 1995 | 57 | 012-018,047-051,063,064,128-130,145-150,266-269,357 |
| Gap from 1995/01/27 at 14.00 to 1995/01/27 at 21.00 | ||
| Gap from 1995/02/03 at 20.00 to 1995/02/15 at 21.00 | ||
| Gap from 1995/02/22 at 00.00 to 1995/02/22 at 07.00 | ||
| Gap from 1995/03/05 at 22.00 to 1995/03/13 at 12.00 | ||
| Gap from 1995/03/24 at 09.00 to 1995/03/24 at 21.00 | ||
| Gap from 1995/03/30 at 14.00 to 1995/04/05 at 10.00 | ||
| Gap from 1995/04/06 at 22.00 to 1995/04/11 at 09.00 | ||
| Gap from 1995/04/14 at 14.00 to 1995/04/14 at 21.00 | ||
| Gap from 1995/04/15 at 14.00 to 1995/04/15 at 22.00 | ||
| Gap from 1995/04/28 at 22.00 to 1995/05/03 at 08.00 | ||
| Gap from 1995/05/10 at 22.00 to 1995/05/25 at 08.00 | ||
| Gap from 1995/06/20 at 11.00 to 1995/07/11 at 07.00 | ||
| Gap from 1995/07/14 at 07.00 to 1995/07/21 at 17.00 | ||
| Gap from 1995/07/25 at 22.00 to 1995/07/28 at 12.00 | ||
| Gap from 1995/08/01 at 13.00 to 1995/08/07 at 14.00 | ||
| Gap from 1995/08/10 at 10.00 to 1995/08/11 at 09.00 | ||
| Gap from 1995/09/08 at 10.00 to 1995/09/19 at 08.00 | ||
| Gap from 1995/09/26 at 10.00 to 1995/10/25 at 13.00 | ||
| Gap from 1995/10/31 at 13.00 to 1995/11/14 at 09.00 | ||
| Gap from 1995/12/03 at 08.00 to 1995/12/04 at 09.00 | ||
| Gap from 1995/12/07 at 07.00 to 1995/12/07 at 15.00 | ||
| Gap from 1995/12/12 at 22.00 to 1995/12/13 at 09.00 | ||
| Gap from 1995/12/18 at 18.00 to 1995/12/21 at 07.00 | ||
| 1995* | 73 | None |
| Gap from 1995/01/16 at 05.00 to 1995/02/15 at 04.00 | ||
| Gap from 1995/02/17 at 17.00 to 1995/02/20 at 10.00 | ||
| Gap from 1995/02/21 at 05.00 to 1995/03/02 at 07.00 | ||
| Gap from 1995/03/08 at 20.00 to 1995/03/09 at 07.00 | ||
| Gap from 1995/03/27 at 14.00 to 1995/03/28 at 01.00 | ||
| Gap from 1995/04/24 at 02.00 to 1995/04/26 at 06.00 | ||
| Gap from 1995/06/06 at 01.00 to 1995/06/12 at 06.00 | ||
| Gap from 1995/07/03 at 01.00 to 1995/07/03 at 12.00 | ||
| Gap from 1995/07/17 at 19.00 to 1995/07/19 at 06.00 | ||
| Gap from 1995/10/01 at 13.00 to 1995/10/02 at 00.00 | ||
| Gap from 1995/10/29 at 07.00 to 1995/10/30 at 12.00 | ||
| Gap from 1995/11/21 at 07.00 to 1995/11/21 at 13.00 | ||
| Gap from 1995/11/29 at 08.00 to 1995/11/30 at 01.00 | ||
| Gap from 1995/12/01 at 02.00 to 1995/12/31 at 21.00 | ||
| 1996* | 75 | None |
| Gap from 1996/02/26 at 14.00 to 1996/02/27 at 01.00 | ||
| Gap from 1996/03/25 at 08.00 to 1996/04/02 at 01.00 | ||
| Gap from 1996/04/09 at 20.00 to 1996/04/15 at 13.00 | ||
| Gap from 1996/04/29 at 02.00 to 1996/04/29 at 13.00 | ||
| Gap from 1996/07/22 at 08.00 to 1996/07/25 at 12.00 | ||
| Gap from 1996/08/01 at 13.00 to 1996/08/02 at 00.00 | ||
| Gap from 1996/08/23 at 07.00 to 1996/11/01 at 00.00 | ||
| Gap from 1996/12/30 at 07.00 to 1996/12/30 at 21.00 | ||
| Gap from 1996/12/31 at 01.00 to 1996/12/31 at 21.00 |
