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Author : Richard W. Sternberg
Publisher : Unknown
Page : 360 pages
File Size : 43,5 Mb
Release : 1977
Category : Columbia River Estuary (Or. and Wash.)
ISBN : UCSD:31822009054834
Author : Anonim
Publisher : Unknown
Page : 158 pages
File Size : 49,5 Mb
Release : 1978
Category : Electronic
ISBN : OCLC:227502435
A multidisciplinary study was conducted offshore of the mouth of the Columbia River to characterize the baseline physical, chemical, and biological aspects of the nearshore zone and to investigate the effects of open-water disposal on the study area. Physical data analyzed during the study indicate that dredged material deposited in the nearshore zone off the mouth of the Columbia River maintains its identity relative to surrounding sediments for periods of years and that such material migrates towards the north at a rate of approximately 0.6 kilo-metre per year. Chemical data suggest that the release of dredged material at the experimental disposal area has no measurable effect on either ambient water quality or quality of the sediments. Dredged material removed from the Columbia River entrance channel can be characterized as fine to medium sand with insignificant levels of pollutants. Bottom sediments examined from the tidal delta in the region of disposal site B consistently showed higher levels of nutrients and metals than sediments from adjacent sampling sites. Biological studies indicate that the disposal of dredged material had a measurable effect on both the benthic macroinvertebrates and the demersal finfish at the experimental disposal area.
Author : Joseph T. Durkin,Sandy J. Lipovsky
Publisher : Unknown
Page : 196 pages
File Size : 48,7 Mb
Release : 1977
Category : Columbia River
ISBN : UCR:31210025959915
Author : Robert L. Holton,N. H. Cutshall,Louis Irwin Gordon,Lawrence Frederick Small
Publisher : Unknown
Page : 220 pages
File Size : 52,6 Mb
Release : 1978
Category : Aquatic ecology
ISBN : UCR:31210025959907
Author : Michael D. Richardson,Andrew Galbraith Carey,William Alexander Colgate
Publisher : Unknown
Page : 411 pages
File Size : 49,9 Mb
Release : 1977
Category : Benthos
ISBN : OCLC:227495648
The objectives of this study were to identify and determine the significance of physical, chemical, and biological factors that govern the rate at which open-water dredged material disposal sites are colonized by benthic assemblages. In the macrobenthic areal baseline, 5 assemblages and 13 species groups were found. The distribution, community structure, and seasonal constancy of these assemblages were related to the distribution of sediments and organic matter, the stability of sediments, and changes in sediment characteristics due to the deposition of fine-grained material from the Columbia River. The deposition of dredged material significantly increased diversity and evenness values and reduced the density of macrofauna. Of the 33 most abundant species, 11 species had significantly lower abundances at stations exposed to direct dredged material deposition. The effects of dredged material disposal on benthos were probably related to direct burial of benthos and changes in sediment characteristics and not increased turbidity from the disposal operation or introduction of pollutants or organic matter.
Author : Anonim
Publisher : Unknown
Page : 0 pages
File Size : 47,6 Mb
Release : 1978
Category : Electronic
ISBN : OCLC:227502435
A multidisciplinary study was conducted offshore of the mouth of the Columbia River to characterize the baseline physical, chemical, and biological aspects of the nearshore zone and to investigate the effects of open-water disposal on the study area. Physical data analyzed during the study indicate that dredged material deposited in the nearshore zone off the mouth of the Columbia River maintains its identity relative to surrounding sediments for periods of years and that such material migrates towards the north at a rate of approximately 0.6 kilo-metre per year. Chemical data suggest that the release of dredged material at the experimental disposal area has no measurable effect on either ambient water quality or quality of the sediments. Dredged material removed from the Columbia River entrance channel can be characterized as fine to medium sand with insignificant levels of pollutants. Bottom sediments examined from the tidal delta in the region of disposal site B consistently showed higher levels of nutrients and metals than sediments from adjacent sampling sites. Biological studies indicate that the disposal of dredged material had a measurable effect on both the benthic macroinvertebrates and the demersal finfish at the experimental disposal area.
Author : Joseph T. Durkin,Sandy J. Lipovsky
Publisher : Unknown
Page : 0 pages
File Size : 51,5 Mb
Release : 1977
Category : Columbia River
ISBN : OCLC:1400075284
Author : C. Rex Bingham
Publisher : Unknown
Page : 116 pages
File Size : 47,5 Mb
Release : 1978
Category : Aquatic ecology
ISBN : UOM:39015095120690
Author : Anonim
Publisher : Unknown
Page : 816 pages
File Size : 51,7 Mb
Release : 1979
Category : Hydrology
ISBN : UOM:39015034724024
Author : Thomas D. Wright
Publisher : Unknown
Page : 66 pages
File Size : 40,6 Mb
Release : 1978
Category : Aquatic ecology
ISBN : UCR:31210024931592
Under the Dredged Material Research Program (DMRP), studies of the impact of dredged material disposal in open-water systems (Aquatic Disposal Field Investigations (ADFI)) were conducted at five locations: New York (Eatons Neck), Ohio (Ashtabula River), Texas (Galveston), Oregon (Columbia River), and Washington (Duwamish Waterway). The sites were representative of a variety of disposal practices, dredged materials, and aquatic habitats. Disposal did not occur during the course of the Eatons Neck ADFI but did at the other four sites. This report summarizes the findings of the investigations.
Author : Anonim
Publisher : Unknown
Page : 158 pages
File Size : 43,8 Mb
Release : 1983
Category : Electronic
ISBN : NWU:35556030086649
Author : Anonim
Publisher : Unknown
Page : 342 pages
File Size : 47,5 Mb
Release : 1983
Category : Electronic
ISBN : NWU:35556031258767
Author : Anonim
Publisher : Unknown
Page : 658 pages
File Size : 54,7 Mb
Release : 1999
Category : Electronic
ISBN : NWU:35556031003536
Author : Charles C. Calhoun,Robert M. Engler,Mark D. Malkasian,Robert M. Meccia,Hanley K. Smith,Hanley Kerfoot Smith
Publisher : Unknown
Page : 148 pages
File Size : 52,6 Mb
Release : 1976
Category : Electronic
ISBN : UCR:31210024817551
Author : Anonim
Publisher : Unknown
Page : 194 pages
File Size : 55,8 Mb
Release : 1991
Category : Electronic
ISBN : NWU:35556030086763