EFFECTS OF HOPPER DREDGE DISPOSAL ON THE DISSOLVED OXYGEN CONCENTRATION IN NORTH SAN FRANCISCO BAY

The dissolved oxygen concentration was monitored during the U.S. Army Corps of Engineers disposal operations at Carquinez Straits and San Pablo Bay disposal sites. These disposal sites are used in conjunction with annual maintenance of the navigation channels in Mare Island Strait and Pinole Shoal, respectively. The objective of the studies was to determine whether local hopper dredge disposal operations result in an observable fluctuation in the dissolved oxygen concentration of the receiving waters. The disposal operations in Carquinez Straits were monitored during 1973 dredging operations on two days using fixed and moving vessels. Discrete readings were taken with continuous monitoring probes with supplementary water samples analyzed by Winkler Titration procedures. Disposal operations at the San Pablo Bay site were monitored for two days in 1974 at a fixed station utilizing multi-parameter probes and water samples. Prior to both dredging operations bottom samples were taken in the channels to characterize the chemical attributes of the sediments which may affect the investigated phenomena. Additionally, sediment samples were taken from the hopper of the dredge prior to disposal for chemical oxygen demand determinations. The disposal of bottom sediments from a hopper dredge were shown to produce both increases and decreases in the dissolved oxygen concentration in the receiving water. The actual effect of a particular disposal operation on the dissolved oxygen level is dependent on many factors, the two most important factors being the chemical composition of the dredged sediments and the amount of mechanical perturbation associated with dredge operations.

  • Supplemental Notes:
    • Cost of entire Proceedings is $25.00.
  • Corporate Authors:

    Marine Technology Society

    5565 Sterrett Place, Suite 108
    Columbia, MD  USA  21044
  • Authors:
    • Wakeman, T H
    • Knutson, P L
    • Sustor, J F
  • Publication Date: 1974-9

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Filing Info

  • Accession Number: 00071908
  • Record Type: Publication
  • Source Agency: Marine Technology Society
  • Report/Paper Numbers: Proceeding
  • Files: TRIS
  • Created Date: Nov 12 1974 12:00AM