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Book Aquatic Disposal Field Investigations Columbia River Disposal Site Oregon Evaluative Summary

Download or read book Aquatic Disposal Field Investigations Columbia River Disposal Site Oregon Evaluative Summary written by and published by . This book was released on 1978 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Book Aquatic Disposal Field Investigations Columbia River Disposal Site Oregon Appendix A Investigation of the Hydraulic Regime and Physical Nature of Bottom Sedimentation

Download or read book Aquatic Disposal Field Investigations Columbia River Disposal Site Oregon Appendix A Investigation of the Hydraulic Regime and Physical Nature of Bottom Sedimentation written by and published by . This book was released on 1977 with total page 409 pages. Available in PDF, EPUB and Kindle. Book excerpt: A two-part study was conducted in a region seaward of the Columbia River where disposal of large quantities of dredged material has occurred over the last several decades. The first part included repeated bathymetric surveys and sampling for distribution and seasonal variations of sediment texture and mineralogy throughout the study area, and especially at designated disposal sites. Near-bottom hydraulic conditions (waves, tides, currents, turbidity) were also measured at several sites and during all seasons. The second part was related to an experiment in which 600,000 cu yd of material dredged from the Columbia River estuary were dumped at a specially designated site, which was monitored before, during, and after disposal. The objectives of the sedimentological aspects of the study were to identify and map all deposits of dredged material and to recognize seasonal and long-term changes. The objectives of the hydraulic aspects were to document the ambient near-bottom conditions, and their effect on the deposit at the experimental site. Sedimentological data show that deposits of dredged material can be identified relative to the surrounding sediments. They tend to maintain their identity for many years, and disperse northward at approximately 0.3 nmi per year. At the experimental disposal site the volume of the bottom deposit was 61% of the total material dumped. Calculations of bedload transport rates, based on seasonal measurements of bottom currents, suggest that 830 cu yd of material (0.2% of the total) spread northward from the site about 0.25 nmi per year.

Book Aquatic Disposal Field Investigations Columbia River Disposal Site Oregon Evaluative Summary

Download or read book Aquatic Disposal Field Investigations Columbia River Disposal Site Oregon Evaluative Summary written by and published by . This book was released on 1978 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Book Aquatic Disposal Field Investigations Columbia River Disposal Site Oregon Appendix B Water Column Primary Productivity and Sediment Studies

Download or read book Aquatic Disposal Field Investigations Columbia River Disposal Site Oregon Appendix B Water Column Primary Productivity and Sediment Studies written by Robert L. Holton and published by . This book was released on 1978 with total page 215 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents the research conducted at the mouth of the Columbia River entitled 'Water Column, Primary Productivity, and Sediment Studies.' The report describes the study plan and the sampling and analytical methods used. The study concludes that the disposal of clean sand in an open-water area has little effect on the levels of the various potential pollutants, either in the water column or in the sediments in the disposal area.

Book Aquatic Disposal Field Investigations Columbia River Disposal Site Oregon

Download or read book Aquatic Disposal Field Investigations Columbia River Disposal Site Oregon written by Michael D. Richardson and published by . This book was released on 1977 with total page 411 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Book Aquatic Disposal Field Investigations Columbia River Disposal Site Oregon Appendix E Demersal Fish and Decapod Shellfish Studies

Download or read book Aquatic Disposal Field Investigations Columbia River Disposal Site Oregon Appendix E Demersal Fish and Decapod Shellfish Studies written by Joseph T. Durkin and published by . This book was released on 1977 with total page 191 pages. Available in PDF, EPUB and Kindle. Book excerpt: Information is provided on 51 finfish and 13 decapod shellfish found at five sites off the Columbia River mouth. The effects of a controlled sediment release by hopper dredges on these indigenous species were studied between October 1974 and April 1976. An initial nine-month phase provided biological information at four sites with a fifth site included in July 1975, as an experimental deposition area. The dredges HARDING and BIDDLE released 548,519 m(3) of sediment between July 9 and August 26, 1975. Sampling continued during and after sediment release until april 1976.

Book Columbia River Dredged Disposal Site Designation

Download or read book Columbia River Dredged Disposal Site Designation written by and published by . This book was released on 1983 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Aquatic Dredged Material Disposal Impacts

Download or read book Aquatic Dredged Material Disposal Impacts written by Thomas D. Wright and published by . This book was released on 1978 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.