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Title: Aquatic disposal field investigations, Ashtabula River disposal site : appendix B : investigation of the hydraulic regime and physical nature of bottom sedimentation
Authors: Danek, L. J.
Alther, G. R.
Paily, P. P.
Johnson, R. G.
de Libero, F.
Yohn, J. F.
Lovorn, F. T.
Keywords: Dredging
Dredging spoil
Dredged material
Ashtabula (Ohio)
Erie, Lake
Sedimentation and deposition
Lake sediments
River sediments
Dredged Material Research Program (U.S.)
Publisher: U.S. Army Engineer Waterways Experiment Station
Series/Report no.: Technical Report (Dredged Material Research Program (U.S.)) ; no. Technical Report D-77-42; Appendix B
Abstract: An investigation of the hydraulic regime and physical nature of bottom sedimentation was conducted in Lake Erie near the Ashtabula Disposal Site. The field sampling phase of the program, conducted between June 1975 and September 1976, included detailed monitoring of physical parameters before, during, arid after disposal operations at the disposal sites and at reference stations. The various hydraulic, sedimentologic, and limnologic data gathered from the site and analyzed include bathymetry and subbottom profiles; current speed and direction, temperature, and transmissivity within the water column; wave characteristics; bottom sediment characteristics and distribution; water levels of Lake Erie; and flow rate and suspended sediment load of the Ashtabula River. The study indicated that the dredged material disposal operation had little effect on the physical nature of the area. The localized increases in temperature, turbidity, and currents resulting from the descending material were quite transient and the conditions generally returned to ambient within an hour. The resulting sediment piles on the lake bottom were less than 0.5 m thick, and were subject to erosion from currents and waves. The currents were the main cause of erosion as most of the wave energy did not penetrate to the bottom. Most of the sediment erosion and subsequent transport occurred during storms when current speeds and wave heights were greatest. Since the currents were generally parallel to shore, the transport of the resuspended dredged material was probably shore-parallel and the material could have traveled several kilometers before settling out of the water column. Analysis of bottom sediment cores revealed that the dredged material was difficult to distinguish from the original lake bottom, indicating that the disposal operation produced only minimal changes in the physical nature of the sediments in the area.
Description: Technical Report
Gov't Doc #: Technical Report D-77-42; Appendix B
Rights: Approved for Public Release; Distribution is Unlimited
Appears in Collections:Technical Report

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