Preliminary Assessment of Sedimentation and Erosion in Eagle River Flats, South-Central Alaska
The physical processes of sedimentation and erosion within the tidal mudflats and salt marshes of Eagle River Flats (ERF), an area used as an artillery impact range by the U.S. Army since 1945, must be understood to evaluate potential treatments of a high duck mortality resulting from ingestion of w...
Main Authors: | , |
---|---|
Other Authors: | |
Format: | Text |
Language: | English |
Published: |
1993
|
Subjects: | |
Online Access: | http://www.dtic.mil/docs/citations/ADA276997 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA276997 |
id |
ftdtic:ADA276997 |
---|---|
record_format |
openpolar |
spelling |
ftdtic:ADA276997 2023-05-15T18:28:33+02:00 Preliminary Assessment of Sedimentation and Erosion in Eagle River Flats, South-Central Alaska Lawson, Daniel E. Brockett, Bruce E. COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH 1993-12 text/html http://www.dtic.mil/docs/citations/ADA276997 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA276997 en eng http://www.dtic.mil/docs/citations/ADA276997 Approved for public release; distribution is unlimited. DTIC AND NTIS Biology Hydrology Limnology and Potamology Solid Wastes Pollution and Control *HAZARDOUS WASTES *SOIL EROSION *DUCKS MORPHOLOGY ARMY FACILITIES ALASKA VARIABLES ENVIRONMENTAL IMPACT ELEVATION POLLUTION WHITE PHOSPHORUS ESTUARIES LEVEES SWAMPS PONDS SEDIMENTATION ARTILLERY RANGES(FACILITIES) VEGETATION ARMY EROSION SEDIMENT TRANSPORT SMOKE SAMPLING RIVERS EAGLE RIVER FLATS(ALASKA) FORT RICHARDSON(ALASKA) Text 1993 ftdtic 2016-02-22T05:50:23Z The physical processes of sedimentation and erosion within the tidal mudflats and salt marshes of Eagle River Flats (ERF), an area used as an artillery impact range by the U.S. Army since 1945, must be understood to evaluate potential treatments of a high duck mortality resulting from ingestion of white phosphorus (WP) particles. The WP originates from smoke-producing devices detonated here. A preliminary assessment of erosion and sedimentation during May to September 1992 indicates that the physical system is complex and the intensity of these processes spatially variable. Deposition from suspension sedimentation generally varied with morphology and elevation, increasing inland from levees on the Eagle River (1 to 2 mm) across vegetated (3 to 6 mm) and unvegetated (5 to 12 mm) mudflats, and into ponds (10 to 19 mm) and salt marshes (10 mm). Resedimentation rates in ponds ranged from 8 to 16 mm. Recession rates of eroding gully headwalls were highly variable, ranging from negligible to over 3.9 m. White phosphorus particles may be in suspended transport through gullies during ebb. Further studies are necessary to better define annual sedimentation and erosion rates, with improved sampling techniques used at an expanded number of sites. Basic data on tidal inundation, sediment influx and efflux, and WP particle transport are required to develop appropriate treatment methods. Alaska, Estuary, Sedimentation, Cook Enlet, Fort Richardson, Subarctic, Erosion, Pollution, Tidal flat. Text Subarctic Alaska Defense Technical Information Center: DTIC Technical Reports database |
institution |
Open Polar |
collection |
Defense Technical Information Center: DTIC Technical Reports database |
op_collection_id |
ftdtic |
language |
English |
topic |
Biology Hydrology Limnology and Potamology Solid Wastes Pollution and Control *HAZARDOUS WASTES *SOIL EROSION *DUCKS MORPHOLOGY ARMY FACILITIES ALASKA VARIABLES ENVIRONMENTAL IMPACT ELEVATION POLLUTION WHITE PHOSPHORUS ESTUARIES LEVEES SWAMPS PONDS SEDIMENTATION ARTILLERY RANGES(FACILITIES) VEGETATION ARMY EROSION SEDIMENT TRANSPORT SMOKE SAMPLING RIVERS EAGLE RIVER FLATS(ALASKA) FORT RICHARDSON(ALASKA) |
spellingShingle |
Biology Hydrology Limnology and Potamology Solid Wastes Pollution and Control *HAZARDOUS WASTES *SOIL EROSION *DUCKS MORPHOLOGY ARMY FACILITIES ALASKA VARIABLES ENVIRONMENTAL IMPACT ELEVATION POLLUTION WHITE PHOSPHORUS ESTUARIES LEVEES SWAMPS PONDS SEDIMENTATION ARTILLERY RANGES(FACILITIES) VEGETATION ARMY EROSION SEDIMENT TRANSPORT SMOKE SAMPLING RIVERS EAGLE RIVER FLATS(ALASKA) FORT RICHARDSON(ALASKA) Lawson, Daniel E. Brockett, Bruce E. Preliminary Assessment of Sedimentation and Erosion in Eagle River Flats, South-Central Alaska |
topic_facet |
Biology Hydrology Limnology and Potamology Solid Wastes Pollution and Control *HAZARDOUS WASTES *SOIL EROSION *DUCKS MORPHOLOGY ARMY FACILITIES ALASKA VARIABLES ENVIRONMENTAL IMPACT ELEVATION POLLUTION WHITE PHOSPHORUS ESTUARIES LEVEES SWAMPS PONDS SEDIMENTATION ARTILLERY RANGES(FACILITIES) VEGETATION ARMY EROSION SEDIMENT TRANSPORT SMOKE SAMPLING RIVERS EAGLE RIVER FLATS(ALASKA) FORT RICHARDSON(ALASKA) |
description |
The physical processes of sedimentation and erosion within the tidal mudflats and salt marshes of Eagle River Flats (ERF), an area used as an artillery impact range by the U.S. Army since 1945, must be understood to evaluate potential treatments of a high duck mortality resulting from ingestion of white phosphorus (WP) particles. The WP originates from smoke-producing devices detonated here. A preliminary assessment of erosion and sedimentation during May to September 1992 indicates that the physical system is complex and the intensity of these processes spatially variable. Deposition from suspension sedimentation generally varied with morphology and elevation, increasing inland from levees on the Eagle River (1 to 2 mm) across vegetated (3 to 6 mm) and unvegetated (5 to 12 mm) mudflats, and into ponds (10 to 19 mm) and salt marshes (10 mm). Resedimentation rates in ponds ranged from 8 to 16 mm. Recession rates of eroding gully headwalls were highly variable, ranging from negligible to over 3.9 m. White phosphorus particles may be in suspended transport through gullies during ebb. Further studies are necessary to better define annual sedimentation and erosion rates, with improved sampling techniques used at an expanded number of sites. Basic data on tidal inundation, sediment influx and efflux, and WP particle transport are required to develop appropriate treatment methods. Alaska, Estuary, Sedimentation, Cook Enlet, Fort Richardson, Subarctic, Erosion, Pollution, Tidal flat. |
author2 |
COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH |
format |
Text |
author |
Lawson, Daniel E. Brockett, Bruce E. |
author_facet |
Lawson, Daniel E. Brockett, Bruce E. |
author_sort |
Lawson, Daniel E. |
title |
Preliminary Assessment of Sedimentation and Erosion in Eagle River Flats, South-Central Alaska |
title_short |
Preliminary Assessment of Sedimentation and Erosion in Eagle River Flats, South-Central Alaska |
title_full |
Preliminary Assessment of Sedimentation and Erosion in Eagle River Flats, South-Central Alaska |
title_fullStr |
Preliminary Assessment of Sedimentation and Erosion in Eagle River Flats, South-Central Alaska |
title_full_unstemmed |
Preliminary Assessment of Sedimentation and Erosion in Eagle River Flats, South-Central Alaska |
title_sort |
preliminary assessment of sedimentation and erosion in eagle river flats, south-central alaska |
publishDate |
1993 |
url |
http://www.dtic.mil/docs/citations/ADA276997 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA276997 |
genre |
Subarctic Alaska |
genre_facet |
Subarctic Alaska |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/ADA276997 |
op_rights |
Approved for public release; distribution is unlimited. |
_version_ |
1766211070565810176 |