10.2190/3H02-G5E1-GXRA-BLPK 3H02G5E1GXRABLPK 1 Diagnosis of Chronic Impacts of Estuarine Dredging 289 311 20020509 20020509 20020509 20020509 3H02G5E1GXRABLPK.pdf http://baywood.metapress.com/link.asp?target=contribution&id=3H02G5E1GXRABLPK 4 David A. Bella Kenneth J. Williamson Department of Civil Engineering, Oregon State University A method for identifying environmental impacts to estuarine sediments has been developed and applied to Coos Bay, Oregon. This approach is directed towards early phases of environmental impact assessment and appears to be effective for promoting truly interdisciplinary efforts. Physical, chemical and biological characteristics are sketched on a two-dimensional plot of organic content of the sediment (OCS) versus rate of sediment turnover (RST). These plots are overlay ed to given common characteristics. Movements of stations on the plane are identified as chronic impacts. Oregon State University, Environmental Impacts of Dredging in Estuaries, Schools of Engineering and Oceanography, Corvallis, Oregon, 675 pp., 1977. D. A. Bella and K. J. Williamson, Conflicts in Interdisciplinary Research, <i>J. Environmental Systems, 6</i>:2, pp. 105-124, 1976-77. D. R. Hancock, J. E. McCauley, J. M. Stander and P. T. Tester, Distribution of Benthic Infauna in Coos Bay, <i>Environmental Impacts of Dredging in Estuaries</i>, Oregon State University, Chapter 6, pp. 509-579, 1977. D. A. Bella and K. J. Williamson, Influence of Organic Carbon and Sediment Turnover Rates on Estuarine Sediment Chemistry, <i>Environmental Impacts of Dredging in Estuaries</i>, Oregon State University, Section V.D, pp. 457-486, 1977. G. L. Hartman and L. S. Slotta, Benthic Topographic Conditions Interpreted From Side Scan Sonar Records, <i>Proceedings of WODCON VII</i>, July 1976. M. Nichols and G. Poor, Sediment Transport in a Coastal Plain Estuary, <i>Journal of the Waterways and Harbors Division, ASCE, 93</i>:WW4, pp. 83-95, 1967. D. A. Bella, A. E. Ramm and P. E. Peterson, Effects of Tidal Flats on Estuarine Water Quality, <i>Journal Water Pollution Control Federation, 44</i>:4, pp. 541-556, 1972. T. Fenchel, The Ecology of Marine Microbenthos. IV. Structure and Function of the Benthic Ecosystem, Its Chemical and Physical Factors and the Microfauna Communities with Special Reference to the Ciliated Protozoa, <i>Ophelia, 6</i>, pp. 1-182, 1969. P. I. Colby and L. L. Smith, Jr., Survival of Walleye Eggs and Fry on Paper Fiber Sludge Deposits in Rainy River, Minnesota, <i>Transactions of the American Fisheries Society, 96</i>, pp. 276-296, 1967. D. A. Bella, Tidal Flats in Estuarine Water Quality Analysis, Environmental Protection Agency, <i>Ecological Research Series</i>, June 1975. D. R. Hitchcock, Biogenic Sulfur Sources and Air Quality in the United States, Aathur D. Little, Inc., Cambridge, Massachusetts, 198 pp., 1977. D. R. Hancock, Subtidal Clam Population: Ecology, Distribution, Abundance and Management, Project No. 1. R/EM-9, OSU Sea Grant College Program, Oregon State University, 1975. M. Maruyama, Paradigms and Communication, <i>Technological Forecasting and Social Change, 6</i>, pp. 3-32, 1974. L. A. Zadeh, Outline of a New Approach to the Analysis of Complex Systems and Decision Processes, <i>IEEE Transactions on Systems, Man and Cybernetics, SMC-3</i>:1, pp. 28-44, January 1973.