Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Movement of Tagged Dredged Sand at Thalweg Disposal Sites in the Upper Mississippi River. Volume 1. Gordon's Ferry and Whitney Island Sites
Experiments were conducted at two sites on the Upper Mississippi River to determine whether and how quickly hydraulically dredged sand would move away from a thalweg disposal site into sensitive habitat areas. Hydraulically dredged sand was tagged with sand coated with fluorescent dye before being deposited in the thalweg. Bathymetric surveys and surficial bottom sampling were conducted on several occasions within 588 and 249 days following disposal at the Gordon's Ferry and Whitney Island sites, respectively. Bottom samples were inspected under ultraviolet light to detect the presence of dyed sand. At both sites, the evidence indicates that the tagged sand remained in the main channel and did not migrate into backwaters and sloughs. The topographically distinct features of each disposal pile were eradicated during the first occurrence of high flow after disposal. The bottom in the disposal area eventually took on the characteristics of the surrounding river bottom. At Gordon's Ferry no downstream movement of tagged sand occurred for over a year; at Whitney Island a major portion of the tagged sand moved downstream about 0.5 km within six months and about 0.8 km within 10 months. The differing rates of downstream movement were probably due to the relatively large flood experienced at the Whitney Island site, coupled with differences in the geometries of the two sites and the initial disposal piles. 5 references, 122 figures, 5 tables. (ERA citation 10:014487)
Movement of Tagged Dredged Sand at Thalweg Disposal Sites in the Upper Mississippi River. Volume 1. Gordon's Ferry and Whitney Island Sites
Experiments were conducted at two sites on the Upper Mississippi River to determine whether and how quickly hydraulically dredged sand would move away from a thalweg disposal site into sensitive habitat areas. Hydraulically dredged sand was tagged with sand coated with fluorescent dye before being deposited in the thalweg. Bathymetric surveys and surficial bottom sampling were conducted on several occasions within 588 and 249 days following disposal at the Gordon's Ferry and Whitney Island sites, respectively. Bottom samples were inspected under ultraviolet light to detect the presence of dyed sand. At both sites, the evidence indicates that the tagged sand remained in the main channel and did not migrate into backwaters and sloughs. The topographically distinct features of each disposal pile were eradicated during the first occurrence of high flow after disposal. The bottom in the disposal area eventually took on the characteristics of the surrounding river bottom. At Gordon's Ferry no downstream movement of tagged sand occurred for over a year; at Whitney Island a major portion of the tagged sand moved downstream about 0.5 km within six months and about 0.8 km within 10 months. The differing rates of downstream movement were probably due to the relatively large flood experienced at the Whitney Island site, coupled with differences in the geometries of the two sites and the initial disposal piles. 5 references, 122 figures, 5 tables. (ERA citation 10:014487)
Movement of Tagged Dredged Sand at Thalweg Disposal Sites in the Upper Mississippi River. Volume 1. Gordon's Ferry and Whitney Island Sites
D. L. McCown (Autor:in) / R. A. Paddock (Autor:in) / J. D. Ditmars (Autor:in)
1984
161 pages
Report
Keine Angabe
Englisch