During the winter of 2011-2012, high winds tore open the 22 ft 6 in diameter Ash Dome atop Denver University's Mt.Evans Womble Observatory*, located at 14,148 ft elevation.
Summer 2016: With permit renewed and new requirements placed on site use by USFS, we are re-configuring how best to proceed. While it is true that sustaining the Mount Evans Womble Observatory does require significant expense in time and treasure, important advantages exist as well. These include:
* that it provides a University of Denver a presence in a high visibility location, atop a mountain with our Founder's name attached (John Evans);
* the facility and telescopes can provide unparalleled training for NSM majors and exceptional opportunities for student engineering design projects, in an exceptional location with very good access to the universe overhead;
* continuing the tradition of 80 years of science on site by the University of Denver and collaborators;
* an investment in facilities (building & off-grid power system) and backing already exists;
* the USFS site use permit has been extended for 30 more years (to 2045);
* it can help justify continued use of the Echo Lake High Altitude Lab;
* the site is hugely inspirational for DU students and the public, and can serve as a sentinel for climate changes;
Thus, I'm recommending that we modernize the facility. Ultimately, one can ask, do we still have men and women to match our mountains?
Watch this space for developments.
This rest of this blog documents some of the twists and turns in the recovery process. A 4 step process was established: [1] Remove the wreckage (done June 11th, 2012); [2] Secure the optics and telescope (done June 13/14, 2012); [3] Close up the open dome room area against precip (done 3 July 2012); [4] Install a replacement dome (20 Oct 2012) - a winter cap, done but does not operate correctly. Inverse chronology follows.
Summer 2016: After 3 summers of attempting to correct problems with the flawed replacement dome and slit motor design and construction, it has been concluded that wholesale replacement is the best way forward. This includes replacement of the aging telescope - control system and updating the dated solar photovoltaic plus battery storage system with newer technologies.
Summer 2015: By 6/30/2015, apply for site use permit renewal, else remove improvements; Explore whether the dome rotation wheels were crushed by weight of the new dome, or whether out-of-round walls cause binding condition: engineering study reports indicates that is the case. Sadly, our contractor seems to not care to make things right. Either way, another observing season lost... Also, CDOT planned significant SH 5 road work near mile 6, but that did not cause much delay.
Summer 2014: During 2013, a series of problems resulted in our contractor being unable to deliver on contractually agreed items, leaving the new dome non-functional. Because of the short summer access season, we were not able to resolve these matters last year, but geared up to address same during summer 2014. Primary upgrades needed include the dome slit lift mechanisms, and the dome rotation mechanisms. As of Memorial Day 2014, CDOT had completed plowing to the summit in time for Memorial Day traffic, despite the heavier-than-average snow season. During June, we have re-activated dome rotation and begun design and measurements for the slit door motor assembly. During July, slit lift machinery was constructed and installed during August, leading to a test run in late summer. During that process, we quantified the problem with dome rotation: the dome is not level. The following measurements were obtained during Sept 2014, for several of the 20 roller wheel assemblies, including support wall to gear track vertical distance, and support wall to gear track horizontal offset (inboard or outboard):
Cardinal direciton | Support wheel set (marked) | Support wall to gear track vertical ht | Support wall face to gear track horizontal offset, inboard or outboard |
NW | 5 | 2.0 inches | 0.5 inch out |
WNW | 7 | 2.1 in | 0 (flush) |
SW | 11 | 2.2 in | 0.5 inch inboard |
S | 14 | 1.6 in | 0 (flush) |
S | 15 | 1.6 in | 0 (flush) |
ENE (near stairs) | 20 | 2.0 in | 0.5 in out |
Outside views confirm that the dome/skirt is tightest to the cylinder wall toward the SE direction, essentially tilted. Whether the excessive friction to rotation is due to wheel or wheel cradle interference, remains to be determined, next summer.
Summer 2013: Goals: obtain dome functionality & restore telescope. 11 July 2013: A crucial step completed, wiring repair enabled telescope to move and interface with Sky software control once again. Telescope rotation also revealed flaws in the cooling system (minor spills). Also during July 2013: Contractor discovers problems with out-of-round shape of dome cylinder wall, causing binding with dome skirt plates. This will require bumping out plate supports for a portion of the azimuth sweep. This lead to a series of delays and re-design, when combined with contractor schedule issues, meant that we only got the dome skirt plate installed and adjusted, plus a dome rotation motor assembly installed but not tested before autumn road closures. As of this writing, the following items will need to be attacked during summer 2014: (a) dome support wall out of round by 1 inch or more, enough to risk breaking wheels unless guide rollers are installed; (b) dome rotation motor control untested - to be done; (c) slit door presently bolted shut - need to design and install lift motor with manual override; (d) address superficial damage caused by initial dome failure plus contractor errors; (e) ideally, schedule a telescope use class for late summer 2014.
- - - - - HISTORY
OF THE EVENTS, 2011 - 2012 - - - - -
NOV.2011: 11th - outdoor
webcam** view shifts from horizontal to staring at the ground,
possibly associated with major windstorm that opened the dome and snapped old growth
trees at Doolittle Ranch below Echo Lake, as reported by owner Bob
Mischke. ** http://netserv.du.edu/video/webpagedump/MTEVANS2.jpg
A
resident of Silver Plume reports measuring a 132 mph wind gust.
Widespread blowdown of trees NW of mile 4 on Mt.Evans highway (noted
later on by Aaron Reid).
- - - - -
DEC.2011/JAN.2012 - high
wind speeds noted for 12/31 and especially 1/17-18 when sustained
hourly averages above 90mph were estimated lasting for nearly a whole
day.
- - - - -
FEB.2012 : 10th - initial contact from Adam
Jones, skilled mountain climber, who wished to practice hike
at/around Mt.Evans observatory in prep for his upcoming Mt.Everest
summit attempt: see http://www.mountwashington.com/everest/
&
http://www.mountwashington.com/bierstadt/
11th - another hiker,
then atop Mt.Bierstadt, posts image of Mt.Evans summit, which on
close inspection shows dome damage and exposed telescope.
- - - -
-
MARCH 2012: 6th - webcam view shows shadow of dome looking
peculiar as sun angle changes - openings in roof allow sunlight to
show through...
15th - Adam Jones reaches summit on foot, provides
first hand account and photos confirming suspected damage - see:
http://mysite.du.edu/~rstencel/MtEvans/RepairSummary.pdf
23rd,
30th - subsequent visits by Adam Jones stabilize and secure the
telescope, debris collected and stashed, other equipment moved to
safety.
- - - - -
APRIL 2012 : 6th - final site visit by Adam
Jones prior to his departure for Nepal and Mt. Everest.
- - - - -
MAY 2012: 1st - CDOT reports road cleared of snow to the summit.
16th - first access by vehicle and visual inspection of damage.
Yes, as bad as it seemed in Adam's photos. New concern about damage
to the worm and drive gears due to dome weight dropped on west arm of
the mount.
17th - purchase request drafted for mirror cleaning
and recoating.
18th - meeting with contractors to discuss next
steps.
- - - - -
JUNE 2012 : 1st - demolition bid selection
meeting, further discussion of dome re-design, emergence of financial
issues.
6th - JP Meyer Trucking selected for dome demo. Site visit
today to establish safety perimeter and clean up slit door wreckage
from downhill areas to the NE. 11th - crane-lift dome wreckage
removal accomplished.
13th - secondary mirror assemblies removed.
14th - primary mirror assemblies removed.
Week of 18th -
temporary roofing installation started week of 25th - progress on
temporary roofing, but high winds slow the pace.
- - - - -
JULY
2012: 3rd - temporary roof enclosure completed - ...see
http://mysite.du.edu/~rstencel/MtEvans/Pix/PICT0151.JPG
15th -
new dome design concept finalized.
26th - useful discussions with
Tom Melsheimer, telescope automation genius, points out the need to:
1. address thermal expansion issues with new dome -> lots of
stainless steel pop rivets in new skin; 2. motors need to be spring
loaded to ride the variations in the gear rack radius ; 3. motors
need an accel/decel ramp to avoid shock of too much inertia & he
helped articulate the difference between MWO and other high end
facilities - we are more experimental rather than specific project
oriented. Next step: what are the important experiments?
27th -
initial steps of fabrication of new dome.
- - - - -
AUG.2012:
Dome fabrication proceeding. ...see *
http://mysite.du.edu/~rstencel/MtEvans/Pix/061b.JPG
- - - - -
SEPT.2012: 4th - first fit check of slit door on dome rib
structure - looks good.
14th - new parts needed for adding
exterior skin of 1/8th inch sheet steel also first snowfall, summit -
race against time...
- - - - -
AUTUMN
2012 OCT.3: Dome
fabrication nearing completion - almost ready to paint and ship
...see * http://mysite.du.edu/~rstencel/MtEvans/Pix/061c.JPG
- Road
has remained largely high and dry, the drought continues...
OCT.20
- somehow the road has remained passable past the usual early Oct
snow closures of prior years, and as a result, NEW DOME DELIVERED!
See: http://mysite.du.edu/~rstencel/MtEvans/Pix/061d.JPG
Site
visits continued during early Nov - unusually dry road. Hardly the
end of the story - still to be done: weatherstripping, motor controls
for dome rotation and opening, dealing with possible telescope damage
from the original event. Much of this may have to wait for summer
2013 access season. Thanks for your continued interest. Check back
for updates.
WINTER 2012/13: Dormancy. As seen on our weather station site, http://gpsmet.noaa.gov/cgi-bin/gnuplots/rti_plots.cgi?SITES=COME the cold arrived on Dec.9th with a drop to -20F (-30C), followed by a month barely above 20F. The next substantial cold wave started Jan.11th, staying close to -20F for several days in a row...
SPRING 2013: snowy . Finally in late
May, the snows have stopped and the weather has warmed. From campus,
we can see the CDOT crews clearing snow on highway 5, and they might
summit by Memorial Day (5/24) after all. Our planning for repairs
centers on getting the dome functional, then repairing the telescope.
One complication involves our contractor being heavily committed to
other projects. Stay tuned.
- - - - -
JUNE 2013: First 2
weeks featured removal of the snow and ice on the observatory access
road, to enable supplies to arrive at the building.
Wed June 19:
first sets of scaffolding arrive and are set up, but mismatched parts
slow this process.
Mon June 24: lift crane on site to re-center the
dome and level the wheels. Result is that the 22,000 lb. dome now can
be turned. Several benign weather days missed due to contractor
scheduling issues.
- - - - -
JULY 2013: welding and
motorization next steps, then telescope rehab... see top of page for continued
story.
Photos available on request.
In review, 2012: Narrowly, we had
to remove the hazardous material that could have fallen on public
nearby, and move to protect the twin telescope that was fully exposed
to high altitude weather. More broadly, with University support, I
feel obliged to return the facility to operational condition whether
or not we can find my eventual successor to direct it, and because it
is worth sustaining as one of the very few high altitude astronomy
sites in North America. More broadly still, whilst I can and should
be helping to resolve the mysteries of the binary star epsilon
Aurigae**, the charge of my endowed professorship also includes the
astronomy infrastructure and observatories. Though I've enjoyed my
time in this role, it seems providing opportunities for students and
promoting what educational research opportunities might exist in this
"industrial astronomy" continues to have merit, if we
believe that there is a future for ground based astronomy, despite effects of
climate change. Thus, full
repair and return to program seems like the proper course at this
juncture.
**see: http://www.aavso.org/sites/default/files/jaavso/v40n2/618.pdf
see
also bookend: http://adsabs.harvard.edu/abs/1999JAVSO..27...61S
.
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