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Glacier Info - Van Trump Glaciers

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Van Trump Glaciers
Van Trump is the name of a glacier in Mount Rainier National Park. It was named for P. B. Van Trump who, with Hazard Stevens, was the first to reach the summit of the Mountain. Van Trump subsequently made several ascents of the mountain including one with John Muir in 1888. Mr. Van Trump was born in Lancaster, Ohio, on December 18,1838. He studied at both Kenyon College and the University of New York, intending to be an attorney. He never practiced law but in 1867 served as secretary to his brother-in-law Washington Territorial Governor Marshal F. Moore and was employed by the National Park Service at Rainier after the park was founded in 1899. (Reese, 2009)

STATISTICS AS OF 2015 (Beason, 2017):

Aerial Extent:
0.07 ± 0.00 square miles (0.18 ± 0.01 km2) (Rank: 28 of 29)

Debris Cover:
--No appreciable debris cover in 2015--

Highest Elevation (Head):
9,236 feet (2,815 m)

Lowest Elevation (Terminus):
7,221 feet (2,201 m)

Elevation Range:
2,015 feet (614 m)

Length:
0.88 miles (1.42 km)

Average Slope:
26°

Average Flow Direction (Flows towards):
South (176°)

CHANGE IN EXTENT, 1896-2015 (Beason, 2017):
Units 1896 1913 1971 1994 2009 2015
Area, mi2 0.56 0.54 0.26 0.28 0.12 0.07
Area, km2 1.44 1.40 0.68 0.72 0.32 0.18

Area change between periods
1913 1971 1994 2009 2015
1896 -0.01 mi2
(-0.04 km2)
-0.29 mi2
(-0.76 km2)
-0.28 mi2
(-0.71 km2)
-0.43 mi2
(-1.12 km2)
-0.49 mi2
(-1.26 km2)
1913 -- -0.28 mi2
(-0.72 km2)
-0.26 mi2
(-0.68 km2)
-0.42 mi2
(-1.08 km2)
-0.47 mi2
(-1.23 km2)
1971 -- 0.02 mi2
(0.04 km2)
-0.14 mi2
(-0.36 km2)
-0.20 mi2
(-0.51 km2)
1994 -- -0.16 mi2
(-0.41 km2)
-0.21 mi2
(-0.55 km2)
2009 -- -0.05 mi2
(-0.14 km2)

Percent change between periods
1913 1971 1994 2009 2015
1896 -2.5 % -52.6 % -49.6 % -77.9 % -87.8 %
1913 -- -51.4 % -48.3 % -77.3 % -87.5 %
1971 -- 6.3 % -53.4 % -74.2 %
1994 -- -56.2 % -75.7 %
2009 -- -44.6 %

ESTIMATED CHANGE IN VOLUME, 1896-2015 (George and Beason, 2017):
PLEASE see important notes about this, below...
Units 1896 1913 1971 1981* 1994 2009 2015
Volume, mi3 0.0258 0.0251 0.0112 0.0111 0.0120 0.0047 0.0024
Volume, km3 0.1077 0.1047 0.0465 0.0465 0.0499 0.0197 0.0102
* = 1981 was the only year that glacial volumes have been measured. See note below.

Basal Shear Stress (τ): 2,111.57 lbs/ft2

Volume change between periods
1913 1971 1981 1994 2009 2015
1896 -0.0007 mi3
(-0.0030 km3)
-0.0147 mi3
(-0.0612 km3)
-0.0147 mi3
(-0.0613 km3)
-0.0139 mi3
(-0.0579 km3)
-0.0211 mi3
(-0.0880 km3)
-0.0234 mi3
(-0.0976 km3)
1913 -- -0.0140 mi3
(-0.0582 km3)
-0.0140 mi3
(-0.0583 km3)
-0.0132 mi3
(-0.0549 km3)
-0.0204 mi3
(-0.0850 km3)
-0.0227 mi3
(-0.0946 km3)
1971 -- -0.0000 mi3
(-0.0001 km3)
0.0008 mi3
(0.0033 km3)
-0.0064 mi3
(-0.0268 km3)
-0.0087 mi3
(-0.0364 km3)
1981 -- 0.0008 mi3
(0.0034 km3)
-0.0064 mi3
(-0.0267 km3)
-0.0087 mi3
(-0.0363 km3)
1994 -- -0.0072 mi3
(-0.0301 km3)
-0.0095 mi3
(-0.0397 km3)
2009 -- -0.0023 mi3
(-0.0096 km3)

Percent change between periods
1913 1971 1981 1994 2009 2015
1896 -2.8 % -56.8 % -56.9 % -53.7 % -81.7 % -90.6 %
1913 -- -55.6 % -55.7 % -52.4 % -81.2 % -90.3 %
1971 -- -0.2 % 7.1 % -57.6 % -78.2 %
1981 -- 7.3 % -57.5 % -78.1 %
1994 -- -60.4 % -79.6 %
2009 -- -48.5 %

With the exception of data in 1981, all values here are calculated estimates based on work by Driedger and Kennard (1986), which calculates glacier volumes with the following equations:

If Glacier Length (L) > 8,500 ft:


If Glacier Length (L) < 8,500 ft:


Basal shear stress (τ) is calculated as:


Where V is the calculated volume of the glacier (ft3), A is the calculated area of the glacier (ft2), ρ is the density of ice (1.779 slug/ft3), g is the acceleration of gravity (32.178 ft/s2), and α is the average slope of the glacier.

If you need a really good research project, recalculating the glacier volumes at Mount Rainier is the way to go!

NOTES:


Data References: Beason, 2017, George and Beason, 2017, Reese, 2009, and Driedger and Kennard, 1986