Hi.
In addition to Andrew Saulter's excellent points, 'air_gap' is far too
generic. 'Air gap' is a term in computer security, plumbing, and
electrical motors, to name only a few of the many vocabularies in which
it is found. Please add more specific detail about the domain to the name.
Grace and peace,
Jim
On 7/25/19 4:42 AM, Saulter, Andrew wrote:
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
[email protected]
<mailto:[email protected]> http://www.metoffice.gov.uk
<http://www.metoffice.gov.uk/>
*From:*CF-metadata <[email protected]> *On Behalf Of
*Andrew Barna
*Sent:* 24 July 2019 21:42
*To:* Aaron Sweeney - NOAA Affiliate <[email protected]>
*Cc:* Armin Pruessner <[email protected]>; CF Metadata List
<[email protected]>; Shawn Maddock - NOAA Federal
<[email protected]>; Peter Stone - NOAA Federal
<[email protected]>; Jena Kent - NOAA Federal <[email protected]>
*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
<[email protected] <mailto:[email protected]>> 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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