BODC FIXED STATION DOCUMENT NO. 63878 Site History : Simonstown, South Africa ======================================= Station name : Simonstown (Cape Point) Latitude: 34 11.3S Country : South Africa Longitude: 018 26.4E GLOSS No. : 268 Time Reference: GMT (hours 00-23) 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: 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 +35cm on 6th March 1979 Possible datum shift of -20cm on 23rd January 1991 Years marked with * below refer to SRD acoustic gauge. COMPLETENESS QUESTIONABLE FLUCTUATIONS (In day Nos.) YEAR INDEX (%) 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 up to 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