QUALITY ASSESSMENT OF SEA LEVEL DATA by the UH SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER JOINT ARCHIVE FOR SEA LEVEL updated: 21 Apr 2020 Station : Ko Lak (Prac. Khiri Khan) Latitude: 11 47.7N Country : Thailand Longitude: 099 49.0E JASL # : 328A Time Meridian: 105E (GMT + 7 hr) GLOSS # : 039 Originator #: KL NODC #: 11091901 Contributor : Naval Hydrographic Dept. Royal Thai Navy Aroon-Amarin Road Bangkok 10600 Thailand Originator : same Original Data: analog Instrmnt Type: mechanical (float type) tide gauge Digitzd Intvl: one hour Present Data : Hourly, daily, and monthly values obtained by: Hourly : The original digitizing interval was hourly Daily : 119-point convolution filter (Bloomfield, 1976) centered on noon applied to the hourly data with respective periods of the 95, 50, and 5% amplitude points at 124.0, 60.2, and 40.2 hours Monthly: Simple average of all daily values; calculated if 7 or fewer days are missing Span of data : 01 Jan 1985 - 31 Dec 2019 Gaps > 1 mon : 20 Nov - 31 Dec 1986;30 Nov 1990 - 20 Jan 1991; 30 Jun 1994 - 06 Aug 1994;31 May 2002 - 01 Jul 2002 24 Mar 2005 - 01 May 2005 Time Refernce: GMT (hours 00-23) Space-filler Flag :-9999 Units : millimeters Missing Data Flag : 9999 Existing : Yes Operational : Yes Sat. Trans. : No Distribution : 1985-2019 Refernce Levl: All heights have been referred to the station tide staff zero which is linked to fixed bench marks. An abrupt box-car shaped level jump was adjusted for 03Z 04 Sep - 16Z 07 Sep 1996 by subtracting 550 cm. This adjustment is uncertain to a few cm. Comment : The daily and monthly means reveal no apparent changes in the reference level. The residuals (observed minus predicted data) show considerable fluctuations of more than 30 cm with periods from 1 to 3 days. CI MISSING REPLACED GAPS QUESTIONABLE YEAR (%) DATA OR BAD DATA FLUCTUATIONS ---- --- -------------------- --------------- -------------------- 1985 100 none (16)365-(23)365 31,154,186-188,203, 225-228,236,244- 247,307-309,327- 331,356-358 1986 87 287-290,318-321, (17)090-(23)090 1-8,13-17,62,83,118- 325-365 (03)149-(09)149 120,129,176-177,192- (03)151-(11)151 196,221-222,238-239, (23)197-(07)198 241-242,313-315 (20)199-(06)200 1987 98 129-130,158-161, (08)054-(16)054 24-29,60-61,64-68, 244-247,341-344, (10)071-(16)071 82-83,86,92-93,121- 365 (17)163-(01)164 123,147-148,156-158, (18)208-(04)209 169-173,177,179,195- (16)231-(00)232 197,200-203,209-212, (18)242-(16)243 256-258,332-336 1988 98 113-116,316-318, none 43-44,50-57,187-188, 347-351 229-232,250,290-291, 312,314-315,326,339- 342 1989 100 none none 46,67-68,95-96,101- 103,138-139,142,160- 161,179-180 1990 92 334-365 none none 1991 95 1-20 none none 1992 100 none (09)209-(07)210 none 1993 99 355-357 none none 1994 86 32-35,104-106,128- none 159-161 139,181-218,283-286 1995 98 1-4,80-84 none 31,85-88,328 1996 96 72-78,93-95,159-165, none 67,126,128,317-321, 174-177 323,339-340 1997 100 none none 60,166,288 1998 99 365 none 155-156,211-212,249, 259-261 1999 96 78-80,112-113,127- none 10-14,111,117,270, 130,133-139,152-155, 304,308-309 199-200 2000 99 231-234 none 164,191,238-239,290- 294,328 2001 99 231-234 (03)120-(16)120 99,110-120,142-151, (17)151-(01)152 281-282 2002 90 151-182,305-308,324- (17)120-(02)121 308-333 325,334-335 2003 96 92-94,106-109,133- (17)059-(16)060 1-2,180-181,303-304 136,250-253,265-268, (17)120-(16)121 295-298,365 (17)181-(16)182 (17)243-(16)244 2004 80 68-71,92-95,245-248, (17)059-(16)060 183-186,354-355 253-255,315-319 (17)213-(01)214 2005 82 83-121,161-163,184- (15)167-(06)168 none 186,189-193,203-215, (17)181-(16)182 230-233,264-267,318- 322 2006 83 8-12,98-101,139-143, none 350-356 148-182,185-188,301- 304,328-333,356-359, 362-365 2007 94 1,56-58,60-66,89-98, (17)004-(02)005 72-74,81-83,101-104, 105-107,110-112,118- (03)190-(10)190 180-181 120,172-173 (09)206-(01)207 (19)301-(02)302 (06)302-(03)303 2008 96 68-70,110-112,114- (22)254-(06)255 130-131,140-141,184- 116,255-257,291-293, (14)287-(23)287 187,211-214,224-227, 294-296,332-335 (11)324-(02)325 268,349-353 (10)325-(22)325 (13)327-(00)328 (03)343-(00)344 2009 94 5-7,13-16,304-321 (09)225-(03)226 8-13,172-177,184- 186,199-206 2010 96 88-89,186-190,223- (04)068-(17)068 15-18,26-33,37-43, 226,269-271,296-299, (06)071-(19)071 53-60,82-84,93-95, 301-303 (03)076-(02)077 105-113,118-121,247, (03)084-(01)085 259 (01)092-(13)092 (10)103-(17)103 (03)104-(10)104 (07)114-(02)115 (17)201-(03)202 (14)300-(03)301 2011 92 224-243,335-337,355- (17)253-(16)254 49,149-152,166,212, 358,362-365 (17)255-(16)256 323-324 (17)257-(16)258 2012 97 1-9,365-366 none 11-15 2013 99 213-217 none none 2014 100 none (14)280-(13)281 none 2015 100 none none none 2016 100 none (17)366-(16)001 none 2017 100 none (17)059-(16)060 none (17)120-(16)121 (17)243-(16)244 (17)304-(16)305 2018 100 none (08)049-(07)050 none (17)059-(16)060 (17)120-(16)121 (17)304-(16)305 (20)347-(07)348 2019 99 366 (17)042-(02)043 none (17)059-(16)060 (17)120-(16)121 (17)181-(16)182 (17)243-(16)244 (17)304-(16)305