Glacial Geology and Stratigraphy of Fort Richardson, Alaska. A Review of Available Data on the Hydrogeology
The surficial geology and glacial stratigraphy of Fort Richardson are extremely complex. Recent mapping by the USGS shows the general distribution of surficial deposits, but details on the underlying stratigraphy remain poorly known, leaving a critical gap in the understanding of ground water condit...
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ftdtic:ADA378398 2023-05-15T16:22:35+02:00 Glacial Geology and Stratigraphy of Fort Richardson, Alaska. A Review of Available Data on the Hydrogeology Hunter, Lewis E. Lawson, Daniel E. Bigl, Susan R. Robinson, Peggy B. Schlagel, Joel D. COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH 2000-04 text/html http://www.dtic.mil/docs/citations/ADA378398 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA378398 en eng http://www.dtic.mil/docs/citations/ADA378398 APPROVED FOR PUBLIC RELEASE DTIC AND NTIS Geology Geochemistry and Mineralogy Snow Ice and Permafrost *GLACIERS *GLACIAL GEOLOGY ALASKA STRATIGRAPHY HYDROGEOLOGY ELMENDORF MORAINE ANCHORAGE(ALASKA) QUARTERNARY GEOLOGY MOUNTAIN VIEW FAN *GLACIAL STRATIGRAPHY Text 2000 ftdtic 2016-02-20T05:17:39Z The surficial geology and glacial stratigraphy of Fort Richardson are extremely complex. Recent mapping by the USGS shows the general distribution of surficial deposits, but details on the underlying stratigraphy remain poorly known, leaving a critical gap in the understanding of ground water conditions below Fort Richardson. A conceptual model of the subsurface stratigraphy was developed on the basis of results of recent surficial mapping, current knowledge of the glacial history studies of modern glaciers, and limited subsurface data. A confining layer below the southern half of the cantonment is likely the northern extension of an "older" ground moraine that crops out further to the south. Below the cantonment, this moraine is buried below about 15 m of outwash and fan deposits, but it appears to be absent to the north, where the confined and unconfined aquifers are hydraulically connected. The northern limit of the "continuous" ground moraine is roughly below the cantonment and parts of Operable Unit D. Buried silt horizons in the fan probably create the locally perched aquifers; however, erosional remnants of the ground moraine and interfingering of debris flow deposits along the Elmendorf Moraine are plausible alternatives. These deposits are composed of finer-grained materials that slow ground water infiltration and cause water to accumulate. Text glaciers Ice permafrost Alaska Defense Technical Information Center: DTIC Technical Reports database Anchorage |
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Open Polar |
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Defense Technical Information Center: DTIC Technical Reports database |
op_collection_id |
ftdtic |
language |
English |
topic |
Geology Geochemistry and Mineralogy Snow Ice and Permafrost *GLACIERS *GLACIAL GEOLOGY ALASKA STRATIGRAPHY HYDROGEOLOGY ELMENDORF MORAINE ANCHORAGE(ALASKA) QUARTERNARY GEOLOGY MOUNTAIN VIEW FAN *GLACIAL STRATIGRAPHY |
spellingShingle |
Geology Geochemistry and Mineralogy Snow Ice and Permafrost *GLACIERS *GLACIAL GEOLOGY ALASKA STRATIGRAPHY HYDROGEOLOGY ELMENDORF MORAINE ANCHORAGE(ALASKA) QUARTERNARY GEOLOGY MOUNTAIN VIEW FAN *GLACIAL STRATIGRAPHY Hunter, Lewis E. Lawson, Daniel E. Bigl, Susan R. Robinson, Peggy B. Schlagel, Joel D. Glacial Geology and Stratigraphy of Fort Richardson, Alaska. A Review of Available Data on the Hydrogeology |
topic_facet |
Geology Geochemistry and Mineralogy Snow Ice and Permafrost *GLACIERS *GLACIAL GEOLOGY ALASKA STRATIGRAPHY HYDROGEOLOGY ELMENDORF MORAINE ANCHORAGE(ALASKA) QUARTERNARY GEOLOGY MOUNTAIN VIEW FAN *GLACIAL STRATIGRAPHY |
description |
The surficial geology and glacial stratigraphy of Fort Richardson are extremely complex. Recent mapping by the USGS shows the general distribution of surficial deposits, but details on the underlying stratigraphy remain poorly known, leaving a critical gap in the understanding of ground water conditions below Fort Richardson. A conceptual model of the subsurface stratigraphy was developed on the basis of results of recent surficial mapping, current knowledge of the glacial history studies of modern glaciers, and limited subsurface data. A confining layer below the southern half of the cantonment is likely the northern extension of an "older" ground moraine that crops out further to the south. Below the cantonment, this moraine is buried below about 15 m of outwash and fan deposits, but it appears to be absent to the north, where the confined and unconfined aquifers are hydraulically connected. The northern limit of the "continuous" ground moraine is roughly below the cantonment and parts of Operable Unit D. Buried silt horizons in the fan probably create the locally perched aquifers; however, erosional remnants of the ground moraine and interfingering of debris flow deposits along the Elmendorf Moraine are plausible alternatives. These deposits are composed of finer-grained materials that slow ground water infiltration and cause water to accumulate. |
author2 |
COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH |
format |
Text |
author |
Hunter, Lewis E. Lawson, Daniel E. Bigl, Susan R. Robinson, Peggy B. Schlagel, Joel D. |
author_facet |
Hunter, Lewis E. Lawson, Daniel E. Bigl, Susan R. Robinson, Peggy B. Schlagel, Joel D. |
author_sort |
Hunter, Lewis E. |
title |
Glacial Geology and Stratigraphy of Fort Richardson, Alaska. A Review of Available Data on the Hydrogeology |
title_short |
Glacial Geology and Stratigraphy of Fort Richardson, Alaska. A Review of Available Data on the Hydrogeology |
title_full |
Glacial Geology and Stratigraphy of Fort Richardson, Alaska. A Review of Available Data on the Hydrogeology |
title_fullStr |
Glacial Geology and Stratigraphy of Fort Richardson, Alaska. A Review of Available Data on the Hydrogeology |
title_full_unstemmed |
Glacial Geology and Stratigraphy of Fort Richardson, Alaska. A Review of Available Data on the Hydrogeology |
title_sort |
glacial geology and stratigraphy of fort richardson, alaska. a review of available data on the hydrogeology |
publishDate |
2000 |
url |
http://www.dtic.mil/docs/citations/ADA378398 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA378398 |
geographic |
Anchorage |
geographic_facet |
Anchorage |
genre |
glaciers Ice permafrost Alaska |
genre_facet |
glaciers Ice permafrost Alaska |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/ADA378398 |
op_rights |
APPROVED FOR PUBLIC RELEASE |
_version_ |
1766010582399451136 |