QUALITY ASSESSMENT OF SEA LEVEL DATA by the UH SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER JOINT ARCHIVE FOR SEA LEVEL updated: 23 Oct 2019 Station : Portland, Victoria Latitude: 38 20.6S Country : Australia Longitude: 141 36.8E JASL # : 129A Time Meridian: 150E (GMT + 10 hr) GLOSS # : 055 Originator #:ID071008 NODC #: 33148101 Contributor : National Tidal Centre, Bureau of Meteorology PO Box 421 Kent Town SA 5071 South Australia AUSTRALIA Originator : same; Australian Baseline Sea Level Monitoring Project Original Data: Digital Instrmnt Type: Aquatrak acoustic gauge Telmet T320 Aquatrak Controller; Prior 27-Aug-2009: SUTRON data logger Digitzd Intvl: 6 minute Weighted average of 4, 1-minute readings; 1-minute reading is average of 60, 1-sec samples. Prior to 27-Aug-2009 Sutron Logger used 6-minute samples average of 181, 1-second samples. Present Data : Hourly, daily, and monthly values obtained by: Hourly : Cosine-Lanczos filter with cutoff of 120 min. 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 1991 - 31 Dec 2018 Gaps > 1 mon : none Time Refernce: GMT (hours 00-23) Space-filler Flag :-9999 Units : millimeters Missing Data Flag : 9999 Existing : Yes Operational : Yes Sat. Trans. : Yes Distribution : 1991-2018 Refernce Levl: Tide Gauge Benchmark (TGBM): Portland (PM) 390 / BM38-81 3D Brass pin in concrete at the northern end of the K S Anderson Wharf 3D 2.943m above the Australian Height Datum (AHD) and 3.450m above Chart Datum. Zero of tide staff is 0.22m below Tide Gauge Zero (TGZ) and 0.507m below the AHD. TGZ is 3.426m below PM386. TGZ is 2.820m below PM298. Chart Datum is 0.014m below TGZ and 0.507m below the AHD. SEAFRAME sensor BM = 2.918m AHD Comment : The data are of good quality. SPECIAL NOTE TO USERS OF NAT. TIDAL CENTRE DATA: As a user of this information, you are deemed to have read and accepted the conditions described in the Copyright Notice and Disclaimer at: http://www.bom.gov.au/other/copyright.shtml CI MISSING REPLACED GAPS QUESTIONABLE YEAR (%) DATA OR BAD DATA FLUCTUATIONS ---- --- -------------------- --------------- -------------------- 1991 100 none none none 1992 95 9-27 none none 1993 100 none none none 1994 100 none none none 1995 100 none none none 1996 99 139-144 none none 1997 100 none none none 1998 99 294-295,362-365 (11)294-(06)295 none 1999 91 1-20,176-187 none none 2000 100 none none none 2001 100 none none none 2002 100 none none none 2003 100 none none none 2004 100 none none none 2005 100 none none none 2006 100 none none none 2007 100 none none none 2008 100 none none none 2009 100 none none none 2010 100 none none none 2011 100 none none none 2012 100 none none none 2013 100 none (22)077-(06)078 none 2014 100 none none none 2015 99 87-89 none none 2016 100 none none none 2017 97 306-317 none none 2018 100 none none none