Llandudno site history
History summary
| Station name | Llandudno |
|---|---|
| Country | UK |
| Latitude of measuring point | 53° 19' 54.0" N |
| Longitude of measuring point | 03° 49' 30.8" W |
| OS grid ref. of measuring point | SH 7855 8319 |
| Datum reference |
All data refer to Admiralty Chart Datum (ACD)
ACD = ODN -3.85m |
| Time reference | GMT (hours 00-23) |
| Contributor |
Environment Agency Anglian Regional Office,
Kingfisher House, Goldhay Way, Orton Goldhay, Peterborough, Cambridgeshire, PE2 5ZR |
| Instrument type |
1994 - DATARING system installed with dual full tide pressure points
1971 - Temporary Neyrpic bubbler gauge |
| Site of measuring point | The measuring points are located on the sub-platform, attached to the pier leg, under the pavilion at the seaward end of Llandudno pier. |
| Position of tide gauge building | SH 7855 8319 - GRP Building on sub-platform |
| Observational period | 1971, 1994 - 2025 |
Benchmark descriptions
| Benchmark | OS grid ref. | Description | Height above ODN (m) |
|---|---|---|---|
| TGBM | SH 7834 8292 | Rivet in stone butt gate ent | 8.708 |
| Aux1 | SH 7827 8255 | OSBM bolt concrete step SE side of slip | 5.273 |
| Aux2 | SH 7840 8243 | OSBM bolt bottom of concrete step | 3.592 |
| Aux3 | SH 7864 8229 | OSBM bolt, concrete ramp 6.5m NW slip | 5.596 |
| ref BM | SH 7860 8321 | Rivet concrete jetty 5m E angle | 6.238 |
ODN = Ordnance Datum Newlyn
Parameters
PLEASE NOTE: All parameters listed below are sea level measured in metres. Different parameter codes represent different gauges. For an explanation of the codes, please see the BODC parameter dictionary.
| Period | Parameters | Completeness index (%) | Sample interval |
|---|---|---|---|
| 1971 | ASLVZZ01 | 24 | 60 minutes |
| 1994 | ASLVBG02 | 95 | 15 minutes |
| 1995 | ASLVBG02 | 91 | 15 minutes |
| 1996 | ASLVBG02 | 97 | 15 minutes |
| 1997 | ASLVBG02 | 99 | 15 minutes |
| 1998 | ASLVBG02 | 98 | 15 minutes |
| 1999 | ASLVBG02 | 98 | 15 minutes |
| 2000 | ASLVBG02 | 98 | 15 minutes |
| 2001 | ASLVBG02 | 99 | 15 minutes |
| 2002 | ASLVBG02 | 97 | 15 minutes |
| 2003 | ASLVBG02 | 71 | 15 minutes |
| 2004 | ASLVBG02 | 81 | 15 minutes |
| 2005 | ASLVBG02 | 100 | 15 minutes |
| 2006 | ASLVBG02 | 96 | 15 minutes |
| 2007 | ASLVBG02 | 94 | 15 minutes |
| 2008 | ASLVBG02 | 95 | 15 minutes |
| 2009 | ASLVBG02 | 100 | 15 minutes |
| 2010 | ASLVBG02 | 100 | 15 minutes |
| 2011 | ASLVBG02 | 99 | 15 minutes |
| 2012 | ASLVBG02 | 99 | 15 minutes |
| 2013 | ASLVBG02 | 100 | 15 minutes |
| 2014 | ASLVBG02 | 100 | 15 minutes |
| 2015 | ASLVBG02 | 100 | 15 minutes |
| 2016 | ASLVBG02 | 99 | 15 minutes |
| 2017 | ASLVBG02 | 100 | 15 minutes |
| 2018 | ASLVBG02 | 100 | 15 minutes |
| 2019 | ASLVBG02 | 100 | 15 minutes |
| 2020 | ASLVBG02 | 99 | 15 minutes |
| 2021 | ASLVBG02 | 100 | 15 minutes |
| 2022 | ASLVBG02 | 99 | 15 minutes |
| 2023 | ASLVBG02 | 76 | 15 minutes |
| 2024 | ASLVBG02 | January - December | 15 minutes |
| 2025 | ASLVBG02 | January - May | 15 minutes |
Quality assessment
All data have been compared with the current Harmonic Constants library, and residuals checked. Records have been visually inspected for spikes, datum shifts and timing errors.
Where there are problems with the primary channel, data may be available from the backup channel. Please contact enquiries@bodc.ac.uk for more information.
March 2003 - File output has been altered so that all values fall on the quarter hour and gaps are filled in with null values, marked with an 'N' flag. Residuals (observed minus predicted sea
level values, measured in metres) are also now included.
May 2004 - The gauge was temporarily offline for refurbishment and upgrade.
On 15/12/2011 a new data logger was installed. Tests were carried out to ensure the logger was functioning correctly, resulting in some data being lost.
November 2012 - The file output has been altered to reflect the Contributor name change from Proudman Oceanographic Laboratory to National Oceanography Centre, Liverpool. Also, the Parameter
code has been improved and now uses a controlled vocabulary.
20 March 2025 - Possible datum shift applied to ASLVBG02.
Missing and suspect data have been reported on the following day numbers:-
| Period | Parameter | Missing data | Suspect data |
|---|---|---|---|
| 1971 | ASLVZZ01 | 001-192,207-209,281-365 | 199-202,215-225,228-242,244-254,274-281 |
| 1994 | ASLVBG02 | 158-166,340-342 356-362 | 118-137,256,295,305-307,309-322 |
| 1995 | ASLVBG02 | 007-008,019-029,045-047,055-056,059-062,065-068,080-084,122-125,164-168 | 138,304-307,312 |
| 1996 | ASLVBG02 | 030-033,298-299,311-316,345-347 | 058-059,063-065,081-082,322-327,341-342,356,361,364,366 |
| 1997 | ASLVBG02 | 231-232 | 001,002,003,007-009,010,021,029,031,043-048,119 |
| 1998 | ASLVBG02 | 358-365 | 077,107,158-166 |
| 1999 | ASLVBG02 | 068-069,082-086,229-230,362 | 047-048,052-054,063-066,068,080-081,102-103,119-120,155,265-266 |
| 2000 | ASLVBG02 | 018-024 | 004-018 |
| 2001 | ASLVBG02 | 052 | 071-076,106,141,184-194,203-205,207,211-212,214-215,217,221-222,224,226,229,231,233,236,238-240,244-245,247,250-266,268-272,274-324,355-365 |
| 2002 | ASLVBG02 | 152,155,157-160,162-172,174-181,330-334 | 001-025,057-058,068-088,094-104,137-150,182-188,190-195,198,200-202,204-207,209,211-212,214-216,218-223,225-226,335-365 |
| 2003 | ASLVBG02 | 007-071,273-279,294-331 | 001-007 |
| 2004 | ASLVBG02 | 112-168,245-260 | None |
| 2005 | ASLVBG02 | None | None |
| 2006 | ASLVBG02 | 032-038,067-071,108-114 | 207-215,227-235 |
| 2007 | ASLVBG02 | 192-213 | 073-079,158-172,181-186 |
| 2008 | ASLVBG02 | 163,184-190,205-209,310-312,332 | 021-022 |
| 2009 | ASLVBG02 | None | 019,333-334 |
| 2010 | ASLVBG02 | None | 266-267 |
| 2011 | ASLVBG02 | 160,306 | 075-078,160-161,177-183,212-215,336,344,348-349 |
| 2012 | ASLVBG02 | 031 | 021,028,038,172,179,346-347 |
| 2013 | ASLVBG02 | None | 154,160-161,185,227,242,249-250,282-285,287,324-325,333,353 |
| 2014 | ASLVBG02 | None | None |
| 2015 | ASLVBG02 | None | 030-032,069,074-078,181,222-223,251,324-325 |
| 2016 | ASLVBG02 | 060-063 | 022,064-065,069,117,152-307,310-312,314-322,324-366 |
| 2017 | ASLVBG02 | None | 001-010,013,015-040,042,046-047,049-051,053-087,089-096,098-115,117-118,129-130,157-158,180-182,221-222,230-231,252,254-258,277-282,284-285,289-290,294-295,300,302,314,316-317,333-334 |
| 2018 | ASLVBG02 | None | 003-004,006-007,012-013,016-017,020,022-025,028,031-033,037,058-062,076-078,090-092,094-095,099-100,120,135-136,141-142,146-147,165,171-173,183,191,235-237,246-247,249-250,253,262,264-267,270-271,273-274,278-279,286,288,294-295,299-306,308-310,312-313,320-327,332,335,339,341-343,345-353,355,357-359,362-363,365 |
| 2019 | ASLVBG02 | None | 002-010,013-014,016-021,023-025,027-028,030-036,038,042-048,053,055-057,059-072,075-082,084-085,087-088,090-091,093-094,097,102-103,113,117-119,122,124,126-129,155,158-164,184,186-187,209,223,227,247-248,252-253,272,274,286,292-294,299-300,308-309,311-312,315-320,329-330,332,334,343-347,349,351-355,359-361,365 |
| 2020 | ASLVBG02 | 142 | 007,009-010,024,033,035,040-042,064-066,072-074,081-083,086-090,096,100-101,103-104,112,127,131-134,151,155,157-158,163-165,185-186,189,238-239,241-243,267-271,276-278,281-287,300,307,324,333,335-336,338-340,343-344,357-360,364,366 |
| 2021 | ASLVBG02 | None | 001-006,008,020-022,030,038-040,046,048,051,054,057,059-061,094-097,117-118,123-124,126-127,141-142,145,169,176,227-228,272,278,287-288,293-295,302,305,307-311,316-317,325-326,328-365 |
| 2022 | ASLVBG02 | 172,200,214,323,360 | 001-119,121-123,125-134,147-148,154-155,170-171,172,177,185,187-188,193-194,200-202,206-214,214-218,220-221,224-226,228-323,323-344,346-359,360-365 |
| 2023 | ASLVBG02 | 055-058,083,199,235-320 | 001-020,025-026,029-036,040,046-051,054,058-061,065-082,083-097,100-104,108-111,114,118-120,124-125,134-137,139,142-149,152-199,204-209,211-226,229-235,320,340-365 |
| 2024 | ASLVBG02 | 037,114,125,132,206,212,213,297,302,303,315,321,322,336,339-340,358-366 | 001-037,039-040,047-057,061-084,089-102,106-114,115-125,125-132,132-206,206-212,213-297,297-302,302-303,303-315,315-321,321-322,322-358 |
| 2025 | ASLVBG02 | 001,066 | 001-066,066-151 |
