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Glacier Info - Sarvent Glaciers

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Sarvent Glaciers
The most easterly of the glaciers on the east slope east of the Meany Crest were named for Henry M. Sarvant, a surveyor and engineer, who made the first detailed map of the mountain. In 1895 Sarvent made what was called "....a comprehensive survey of the east side...." of the Mountain. At the time Sarvent was a Tacoma resident who was employed by Frederick G. Plummer, a civil Engineer who at one time was Pierce County auditor. (Reese, 2009)

STATISTICS AS OF 2015 (Beason, 2017):

Aerial Extent:
0.18 ± 0.01 square miles (0.45 ± 0.02 km2) (Rank: 24 of 29)

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

Highest Elevation (Head):
7,199 feet (2,194 m)

Lowest Elevation (Terminus):
6,094 feet (1,858 m)

Elevation Range:
1,105 feet (337 m)

Length:
0.47 miles (0.76 km)

Average Slope:
25°

Average Flow Direction (Flows towards):
N (6°)

CHANGE IN EXTENT, 1896-2015 (Beason, 2017):
Units 1896 1913 1971 1994 2009 2015
Area, mi2 -- 0.44 0.26 0.06 0.27 0.18
Area, km2 -- 1.15 0.69 0.15 0.69 0.45

Area change between periods
1913 1971 1994 2009 2015
1896 0.44 mi2
(1.15 km2)
0.27 mi2
(0.69 km2)
0.06 mi2
(0.15 km2)
0.27 mi2
(0.70 km2)
0.18 mi2
(0.46 km2)
1913 -- -0.18 mi2
(-0.46 km2)
-0.39 mi2
(-1.00 km2)
-0.17 mi2
(-0.45 km2)
-0.27 mi2
(-0.69 km2)
1971 -- -0.21 mi2
(-0.54 km2)
0.00 mi2
(0.01 km2)
-0.09 mi2
(-0.23 km2)
1994 -- 0.21 mi2
(0.55 km2)
0.12 mi2
(0.31 km2)
2009 -- -0.09 mi2
(-0.24 km2)

Percent change between periods
1913 1971 1994 2009 2015
1896 -114,736.2 % -68,649.8 % -14,652.8 % -69,518.6 % -45,520.5 %
1913 -- -40.2 % -87.3 % -39.4 % -60.4 %
1971 -- -78.8 % 1.3 % -33.7 %
1994 -- 377.0 % 212.1 %
2009 -- -34.6 %

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 -- 0.0201 0.0113 0.0089 0.0020 0.0114 0.0071
Volume, km3 -- 0.0836 0.0469 0.0372 0.0082 0.0476 0.0295
* = 1981 was the only year that glacial volumes have been measured. See note below.

Basal Shear Stress (τ): 2,333.98 lbs/ft2

Volume change between periods
1913 1971 1981 1994 2009 2015
1896 0.0201 mi3
(0.0836 km3)
0.0113 mi3
(0.0469 km3)
0.0089 mi3
(0.0372 km3)
0.0020 mi3
(0.0082 km3)
0.0114 mi3
(0.0476 km3)
0.0071 mi3
(0.0295 km3)
1913 -- -0.0088 mi3
(-0.0367 km3)
-0.0111 mi3
(-0.0465 km3)
-0.0181 mi3
(-0.0754 km3)
-0.0086 mi3
(-0.0360 km3)
-0.0130 mi3
(-0.0541 km3)
1971 -- -0.0023 mi3
(-0.0098 km3)
-0.0093 mi3
(-0.0387 km3)
0.0002 mi3
(0.0007 km3)
-0.0042 mi3
(-0.0174 km3)
1981 -- -0.0069 mi3
(-0.0289 km3)
0.0025 mi3
(0.0104 km3)
-0.0018 mi3
(-0.0076 km3)
1994 -- 0.0094 mi3
(0.0394 km3)
0.0051 mi3
(0.0213 km3)
2009 -- -0.0043 mi3
(-0.0180 km3)

Percent change between periods
1913 1971 1981 1994 2009 2015
1896 -8,361,686.8 % -4,691,278.1 % -3,716,100.0 % -821,894.8 % -4,758,160.0 % -2,953,767.5 %
1913 -- -43.9 % -55.6 % -90.2 % -43.1 % -64.7 %
1971 -- -20.8 % -82.5 % 1.4 % -37.0 %
1981 -- -77.9 % 28.0 % -20.5 %
1994 -- 479.0 % 259.4 %
2009 -- -37.9 %

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:
Area was not measured for this glacier in 1896

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