19 resultados para sediment retention in reservoirs
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Issued Feb. 1978.
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Cover title.
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"August 1987."
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"September 1990."
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At head of title: Environmental & Water Quality Operational Studies.
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New dredge-disposal techniques may serve the dual role of aiding sand by-passing across coastal inlets, and beach nourishment, provided the dredged sediments placed seaward of the surf zone move shoreward into that zone. During the summer of 1976, 26,750 cubic meters of relatively coarse sediment was dredged from New River Inlet, North Carolina, moved down coast by a split-hull barge, and placed in a 215-meter coastal reach between the 2- and 4-meter depth contours. Bathymetric changes on the disposal piles and in the adjacent beach and nearshore area were studied for a 13-week period (August to November 1976) to determine the modification of the surrounding beach and nearshore profile, and the net transport direction of the disposal sediment. The sediment piles initially created a local shoal zone with minimum depths of 0.6 meter. Disposal sediment was coarser (Mn = 0.49 millimeter) than the native sand at the disposal site (Mn = 0.14 millimeter) and coarser than the composite mean grain size of the entire profile (Mn = 0.21 millimeter). Shoaling and breaking waves caused rapid erosion of the pile tops and a gradual coalescing of the piles to form a disposal bar located seaward (= 90 meters) of a naturally occurring surf zone bar. As the disposal bar relief was reduced, the disposal bar-associated breaker zone was restricted to low tide times or periods of high wave conditions.
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Mode of access: Internet.
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Mode of access: Internet.
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Prepared in cooperation with the cities of Madison, Middleton, Douglas County, University of Wisconsin-Extension, Geological and Natural History Survey, Army Corps of Engineers, Wisconsin Dept. of Natural Resources.
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One folded map in pocket.
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Mode of access: Internet.
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"Donna D. Turgeon ... [et al.]"--P. 1.
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"October, 1982."
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"April 1994."
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Bibliography: p. 6.