scholarly journals The Annual Emptying of Lake George, Alaska

ARCTIC ◽  
1963 ◽  
Vol 16 (1) ◽  
pp. 26 ◽  
Author(s):  
Kirk H. Stone
Keyword(s):  
Shallow Lakes ◽  
Lake Water ◽  
Water Surface ◽  
South Central ◽  
Site Characteristics ◽  
Glacier Ice ◽  
Dammed Lake ◽  
Lake George

Description and partial interpretation of the natural emptying of this ice-dammed lake in south-central Alaska. Regional and site characteristics, the 1951 observations and other emptyings since 1935 are described; and the age of the lake as evidenced by terracettes, willows, alders, and exposed deltas, is considered. When studied July 20, 1951, it was about 2-4 mi wide, 11-12 mi long, 114 ft deep, and dammed by Knik Glacier. In 12 days, the lake water had undercut the glacier ice and escaped, leaving three small, shallow lakes with 42 % less water surface. The drop in level (up to 12 in/hr) was accompanied by the rise of Knik River from 7 to nearly 20 ft depth, and flooding. A trend is noted toward earlier emptying and greater flooding.

scholarly journals The flow of Fireweed rock glacier, Alaska, U.S.A.

2004 ◽  
Vol 50 (168) ◽  
pp. 76-86 ◽  
Author(s):  
Adam K. Bucki ◽  
Keith A. Echelmeyer
Keyword(s):  
Mass Balance ◽  
Rectangular Channel ◽  
Shear Plane ◽  
Rock Glacier ◽  
South Central ◽  
Glacier Ice ◽  
Internal Deformation ◽  
Velocity Variations

AbstractFireweed rock glacier is a large rock glacier in south central Alaska, U.S.A. It flows relatively fast, with velocities up to 3.5 ma–1, and exhibits both seasonal and annual velocity variations, some of which are related to periodic terminus calving and increased rainfall. Our analysis reveals that motion is likely concentrated in a pseudo-rectangular channel within the larger parabolic channel with a “shear plane” at ~27 m depth. There is likely motion along the shear plane as well as internal deformation above it. We estimate that the ice—rock mixture is up to seven times softer than clean glacier ice with a temperature of –2°C. Calving at the terminus is an important component of the mass balance of this rock glacier.

Fish and Benthic Invertebrates: Community Concordance and Community–Environment Relationships

1993 ◽  
Vol 50 (12) ◽  
pp. 2641-2651 ◽  
Author(s):  
Donald A. Jackson ◽  
Harold H. Harvey
Keyword(s):  
Water Chemistry ◽  
Shallow Lakes ◽  
Benthic Invertebrates ◽  
Cold Water ◽  
Morphological Characteristics ◽  
Community Environment ◽  
South Central ◽  
Invertebrate Predators ◽  
Lake Morphology ◽  
The Impact

Fish and benthic invertebrates from 40 lakes in south-central Ontario showed significantly concordant patterns based on community structure. Fish communities were associated significantly with lake morphological characteristics, but were uncorrelated with water chemistry. Large, deep lakes differed from shallow lakes in their fish species, having richer faunas due to the additional cold-water species. Centrarchid species occurred more frequently in small, shallow lakes than in larger lakes. The invertebrate community was not correlated with lake morphology, but showed a significant association with water chemistry, principally lake pH. A strong contrast in the abundance of Chaoborus and Holopedium existed, but it was unclear whether this was due to a predator–prey relationship or to differences in acid tolerance. Although the lakes showed similar patterns in the composition of both communities, each community was associated with a different set of environmental factors. Biotic processes within and between communities explain this paradox in community–environment relationships. Such biotic interactions may involve direct processes such as fish predation on a particular invertebrate taxon or indirect factors, e.g., where fish limit the abundance of invertebrate predators, thereby limiting the impact of these invertebrate predators.

Long-term changes in lake sediments and their infl uences on lake water quality in Japanese shallow lakes

2010 ◽  
Vol 177 (3) ◽  
pp. 177-188 ◽  
Author(s):  
Takehiko Fukushima ◽  
Koichi Kamiya ◽  
Yuichi Onda ◽  
Akio Imai ◽  
Kazuo Matsushige
Keyword(s):  
Water Quality ◽  
Lake Sediments ◽  
Shallow Lakes ◽  
Lake Water ◽  
Lake Water Quality ◽  
Long Term Changes

Study on Monitoring Water Surface in Poyang Lake by MODIS Image

2013 ◽  
Vol 303-306 ◽  
pp. 744-747
Author(s):  
Xing Hua Le ◽  
Mei Ying Wan ◽  
Zhe Wen Fan ◽  
Yu Fang ◽  
Ling Quang Huang
Keyword(s):  
Lake Water ◽  
Water Surface ◽  
Poyang Lake ◽  
Image Data ◽  
Water Monitoring ◽  
Surface Information ◽  
Resolution Image ◽  
Monitoring Time ◽  
Modis Image

. In the paper, we use med-resolution image data-MODIS to monitor Poyang Lake water surface. The resolution of images is 250 meters. The cycle of the monitoring frequence is 8 days. The monitoring time is from Jan, 1st to June, 25th, 2012. We select water surface in the embankment of Poyang Lake as the research object. The results show that Modis image can extracte water surface information quickly for water monitoring in time. The technology can be supplied to trail the change of Poyang Lake eco-system frequently.

scholarly journals Ice composition evidence for the formation of basal ice from lake water beneath a cold-based Antarctic glacier

1999 ◽  
Vol 28 ◽  
pp. 277-281 ◽  
Author(s):  
R. D. Lorrain ◽  
S. J. Fitzsimons ◽  
M. J. Vandergoes ◽  
M. Stiévenard
Keyword(s):  
Lake Water ◽  
Freezing Point ◽  
Isotope Composition ◽  
Gas Content ◽  
Dry Valleys ◽  
Basal Ice ◽  
Lake Bottom ◽  
Ice Flows ◽  
Classical Models ◽  
Glacier Ice

AbstractEntrainment of debris by cold-based glaciers having basal temperatures as low as — 17°C can be observed in the Dry Valleys of south Victoria Land, Antarctica. The classical models developed to explain debris incorporation at the glacier base are inappropriate in such cases, since the basal temperature is well below the freezing point. An alternative model, based on the presence of ice-marginal lakes, has recently been proposed by one of the authors (S. F.). In this model, transient wet-base conditions can occur as ice flows onto the unfrozen sediments of the lake bottom, creating conditions favorable to the entrainment of sediments and to ice accretion by water freezing.Here we describe a situation where this model is consistent with an ice-composition study of the basal part of Suess Glacier, Taylor Valley. The stable isotope composition indicates that water freezing, most probably lake water, plays a major role in the formation of the basal ice layers. Total gas content of this basal ice is considerably depleted when compared to meteoric glacier ice, in accordance with a rejection mechanism during freezing. Its gas composition, strongly enriched in CO2, is also indicative of the presence of a former liquid phase.

scholarly journals INLAND-LAKES PROTECTION APPLICATION WITH HIGH RESOLUTION SATELLITE IMAGERY IN WUHAN CITY

2015 ◽  
Vol XL-7/W3 ◽  
pp. 1025-1028
Author(s):  
X. Wen ◽  
Z. Li ◽  
D. Xiang ◽  
S. Shen ◽  
D. Hu ◽  
...  
Keyword(s):  
High Resolution ◽  
Change Detection ◽  
Lake Water ◽  
Water Surface ◽  
Object Oriented ◽  
Observation System ◽  
Lake Area ◽  
Inland Lakes ◽  
Inland Lake ◽  
Detection Technology

The new data source of China’s civilian high resolution earth observation system ZY-3, GF-1 were applied in the application of the monitoring and protection of the inland-lakes in Wuhan, Hubei Province. After the pre-process of these high resolution satellite images, the object-oriented classification and object-oriented change detection technology were applied in the inland-lakes protection of Wuhan, China. In this paper, the Xiwanhu Lake and Tangxunhu Lake including their surrounding areas were selected as an example, with the experiments the status of these lakes including the lake boundary, lake area and the change of these lakes including the lake water surface increased area, lake water surface decreased area were be obtained. Compared with the pixel-based method, the object-oriented classification and change detection technology shows its intuitive and higher precision in inland-lake protection. Remote sensing technology should be applied in monitoring and protection the inland-lake and other respects of water resource management more widely and deeply in China.

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