Hi Aaron,
I?d agree that air_gap would be a very useful parameter to include. Following up on Andrew Barna?s question, I did wonder if it is possible to make this somewhat more generic (e.g. air_gap is also a standard term in oil platform design and could, potentially, be used across a wider set of wave overtopping metrics).
If that makes sense, it might also be worth adding a standard name for ?freeboard?? To my understanding the difference is that freeboard works with an idealised still water level, whereas air gap is an instantaneous parameter (i.e. associated with the maximum wave crest height)?
In both cases there may be a need for some form of auxiliary coordinate specifying the vertical datum that is being used?
Sorry ? only questions at this point, not solutions. As with Andrew this is on the edge of my expertise?
Regards
Andy
Andy Saulter
Surge, Waves and Metocean Projects Manager
Met Office FitzRoy Road Exeter Devon EX1 3PB
Tel: +44 (0)330 1350202 Fax: +44 (0)1392 885681
andrew.saulter at metoffice.gov.uk<mailto:andrew.saulter at metoffice.gov.uk>
http://www.metoffice.gov.uk<
http://www.metoffice.gov.uk/>
From: CF-metadata <cf-metadata-bounces at cgd.ucar.edu> On Behalf Of Andrew Barna
Sent: 24 July 2019 21:42
To: Aaron Sweeney - NOAA Affiliate <aaron.sweeney at noaa.gov>
Cc: Armin Pruessner <armin.pruessner at noaa.gov>; CF Metadata List <cf-metadata at cgd.ucar.edu>; Shawn Maddock - NOAA Federal <shawn.maddock at noaa.gov>; Peter Stone - NOAA Federal <peter.stone at noaa.gov>; Jena Kent - NOAA Federal <jena.kent at noaa.gov>
Subject: Re: [CF-metadata] proposal for new standard name: air_gap
Hi Aaron,
This one is way outside my field, but was interesting, these questions are my own curiosity.
Is "low steel" an accepted term in whatever field you are in? I was handing a hard time finding it used outside "low carbon". Does this term apply to bridges that aren't made out of steel?
Does this only apply to the intended navigable portion of the waterway? if yes, how about "instantaneous_navigational_clearance" or "instantaneous_guide_clearances"? I found these terms in the USCG Bridge Programs website, without the "instantaneous" part.
-Barna
On Wed, Jul 24, 2019 at 1:07 PM Aaron Sweeney - NOAA Affiliate <aaron.sweeney at noaa.gov<mailto:aaron.sweeney at noaa.gov>> wrote:
Hi,
I haven't found an existing CF standard name for this concept (nor a previous discussion), so I am proposing a new standard name, as below:
Proposed Standard Name: air_gap
Canonical Units: m
Description: The air gap is the clearance (vertical distance) between the instantaneous height of the designated low steel value of a bridge and the instantaneous sea surface height. The height of the designated low steel value of a bridge may change due to traffic or other loads.
Note: I did make some effort to review existing standard name patterns, but the results (below) were coming out rather long, which may be an impediment toward understanding and adoption, but I include them here for completeness: height_difference_between_instantaneous_designated_low_steel_value_of_bridge_and_instantaneous_sea_surface_height
-or-
height_difference_between_instantaneous_designated_low_steel_value_of_bridge_and_instantaneous_sea_level
The air gap is used for safety of navigation into and out of ports with bridges.
Cordially,
Aaron
--
Aaron D. Sweeney, Ph. D.
Water Level Data Manager
Cooperative Institute for Research in Environmental Sciences (CIRES)
University of Colorado at Boulder
and
NOAA National Centers for Environmental Information
formerly NOAA's National Geophysical Data Center
325 Broadway, E/NE42
Boulder, CO 80305-3328
Phone: 303-497-4797, Fax: 303-497-6513
ORCID iD: 0000-0002-2489-6695<https://orcid.org/0000-0002-2489-6695>
DISCLAIMER: The contents of this message are mine personally and do not necessarily reflect any position of NOAA.
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