Depositional Environments in the Colville River Delta.
The Colville River delta is growing northward into the Arctic Ocean at a point about 40 km west of Prudhoe Bay. Within the delta are a number of environments that owe their existence, characteristics and distribution to a variety of interrelated depositional and erosional processes. The subaerial po...
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ftdtic:ADA034539 2023-05-15T14:55:48+02:00 Depositional Environments in the Colville River Delta. Walker,H J LOUISIANA STATE UNIV BATON ROUGE COASTAL STUDIES INST 1977-07 text/html http://www.dtic.mil/docs/citations/ADA034539 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA034539 en eng http://www.dtic.mil/docs/citations/ADA034539 APPROVED FOR PUBLIC RELEASE DTIC AND NTIS Geology Geochemistry and Mineralogy *GEOMORPHOLOGY *DELTAS ALASKA WIND DEPOSITS EROSION SNOW MELTING RIVERS SEDIMENTS SEA ICE PERMAFROST ARCTIC OCEAN Colville River Delta(Alaska) WUNR388002 Text 1977 ftdtic 2016-02-20T11:59:52Z The Colville River delta is growing northward into the Arctic Ocean at a point about 40 km west of Prudhoe Bay. Within the delta are a number of environments that owe their existence, characteristics and distribution to a variety of interrelated depositional and erosional processes. The subaerial portion (about 600 sq km in area) of the delta contains a number of distributary channels, a variety of lakes and marshes, extensive sandbars and mudflats and sandbar-bordering lee dunes. Subaqueous environments include channels, levees, distal bars and a complicated prodelta zone. Marine and fluvial processes are basically similar to those occurring in non-arctic deltas -- river flow, tidal action and wave energy are all present. However, both temporal and areal variability is great primarily because of the extreme seasonality of climate. The presence of permafrost and the long-lasting snow and ice cover (8-9 months) confine most activitity to a very short period of time. The natura and timing of snowmelt and river and sea ice break up affect depositional rates and locations. Flooding of the subaerial portion of the delta is highly variable from year to year. Ice serves as a damming agent affecting flood levels and deposition amounts. As a transporting agent, ice can carry variable size sediments and thus, areas subject to flooding have occasional erractics among their deposits. Because extensive bars are exposed during most of the non-snow covered period wind deflation and sand dune development are common. Presented at Alaska Geological Society Symposium, Apr 75, Anchorage, Alaska. Text Arctic Arctic Ocean Ice permafrost Prudhoe Bay Sea ice Alaska Defense Technical Information Center: DTIC Technical Reports database Anchorage Arctic Arctic Ocean |
institution |
Open Polar |
collection |
Defense Technical Information Center: DTIC Technical Reports database |
op_collection_id |
ftdtic |
language |
English |
topic |
Geology Geochemistry and Mineralogy *GEOMORPHOLOGY *DELTAS ALASKA WIND DEPOSITS EROSION SNOW MELTING RIVERS SEDIMENTS SEA ICE PERMAFROST ARCTIC OCEAN Colville River Delta(Alaska) WUNR388002 |
spellingShingle |
Geology Geochemistry and Mineralogy *GEOMORPHOLOGY *DELTAS ALASKA WIND DEPOSITS EROSION SNOW MELTING RIVERS SEDIMENTS SEA ICE PERMAFROST ARCTIC OCEAN Colville River Delta(Alaska) WUNR388002 Walker,H J Depositional Environments in the Colville River Delta. |
topic_facet |
Geology Geochemistry and Mineralogy *GEOMORPHOLOGY *DELTAS ALASKA WIND DEPOSITS EROSION SNOW MELTING RIVERS SEDIMENTS SEA ICE PERMAFROST ARCTIC OCEAN Colville River Delta(Alaska) WUNR388002 |
description |
The Colville River delta is growing northward into the Arctic Ocean at a point about 40 km west of Prudhoe Bay. Within the delta are a number of environments that owe their existence, characteristics and distribution to a variety of interrelated depositional and erosional processes. The subaerial portion (about 600 sq km in area) of the delta contains a number of distributary channels, a variety of lakes and marshes, extensive sandbars and mudflats and sandbar-bordering lee dunes. Subaqueous environments include channels, levees, distal bars and a complicated prodelta zone. Marine and fluvial processes are basically similar to those occurring in non-arctic deltas -- river flow, tidal action and wave energy are all present. However, both temporal and areal variability is great primarily because of the extreme seasonality of climate. The presence of permafrost and the long-lasting snow and ice cover (8-9 months) confine most activitity to a very short period of time. The natura and timing of snowmelt and river and sea ice break up affect depositional rates and locations. Flooding of the subaerial portion of the delta is highly variable from year to year. Ice serves as a damming agent affecting flood levels and deposition amounts. As a transporting agent, ice can carry variable size sediments and thus, areas subject to flooding have occasional erractics among their deposits. Because extensive bars are exposed during most of the non-snow covered period wind deflation and sand dune development are common. Presented at Alaska Geological Society Symposium, Apr 75, Anchorage, Alaska. |
author2 |
LOUISIANA STATE UNIV BATON ROUGE COASTAL STUDIES INST |
format |
Text |
author |
Walker,H J |
author_facet |
Walker,H J |
author_sort |
Walker,H J |
title |
Depositional Environments in the Colville River Delta. |
title_short |
Depositional Environments in the Colville River Delta. |
title_full |
Depositional Environments in the Colville River Delta. |
title_fullStr |
Depositional Environments in the Colville River Delta. |
title_full_unstemmed |
Depositional Environments in the Colville River Delta. |
title_sort |
depositional environments in the colville river delta. |
publishDate |
1977 |
url |
http://www.dtic.mil/docs/citations/ADA034539 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA034539 |
geographic |
Anchorage Arctic Arctic Ocean |
geographic_facet |
Anchorage Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean Ice permafrost Prudhoe Bay Sea ice Alaska |
genre_facet |
Arctic Arctic Ocean Ice permafrost Prudhoe Bay Sea ice Alaska |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/ADA034539 |
op_rights |
APPROVED FOR PUBLIC RELEASE |
_version_ |
1766327820780306432 |