This book represents a compilation of papers presented at a symposium on the subject "Suspended Solids in Hater." held in Santa Barbara. California. U.S.A .¿ on March 20. 2] and 22, 1973. The symposium was sponsored by the Office of Naval Research and was designed to bring together a group that represented the domi­ nant cross section of international research in this area. The idea for the conference originated as ONR recognized a potentially interesting area that, to date. had not had the benefit of a co­ ordinating symposium and/or a book published on the specific sub­ ject. In addition to the formal presentation of papers - informal open discussions followed - the symposium included two stimulating workshops. An abundance of impromptu exchange filled unscheduled periods. Many of the contributors have incorporated in their pa­ pers the ideas and points raised in discussions following formal presentation and at other times. The reader thus actually profits from the various discussions throughout the meeting. The two half-day workshops were directed toward the subjects of sampling and concentrating suspended materials and in situ in­ strumentation. I have summarized the discussions from the two workshops for the reader and have correlated the material wherever possible in an introductory chapter. I have also included intro­ ductory material to acquaint the newcomer with the general field.

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I. Principles of Studying Suspended Material and Its Settling Velocities.- Principles of Studying Suspended Materials in Water.- Stokes' Settling and Chemical Reactivity of Suspended Particles in Natural Waters.- II. Principles of Optical Techniques.- Beam Transmissometers for Oceanographic Measurements.- Volume-Scattering Functions in Ocean Waters.- Mie Theory Models of Light Scattering By Ocean Particulates.- Spatial Distribution of the Index of Refraction of Suspended Matter in the Ocean.- Absolute Calibration of a Scatterance Meter.- III. Nearshore Studies.- Effects of Tropical Storm Agnes on the Suspended Solids of the Northern Chesapeake Bay.- Distribution and Transport of Suspended Particulate Matter in Submarine Canyons Off Southern California.- Continuous Light-Scattering Profiles and Suspended Matter Over Nitinat Deep-Sea Fan.- Physical, Chemical, and Optical Measures of Suspended-Particle Concentrations: Their Intercomparisons and Application to the West African Shelf.- The Distribution of Particulate Matter in a Northwest African Coastal Upwelling Area.- The Suspended Material of the Amazon Shelf and Tropical Atlantic Ocean.- IV. Offshore Studies.- Turbidity Distribution in the Deep Waters of the Western Atlantic Trough.- Variations in Benthic Boundary Layer Phenomena: Nepheloid Layer in the North American Basin.- Distribution of Suspended Particles in the Equatorial Pacific Ocean.- Suspended Matter and the Stability of the Water Column: Central Caribbean Sea.- Light-Scattering Measurements and Chemical Analysis of Suspended Matter in the Near-Bottom Nepheloid Layer of the Gulf of Mexico.- Light Scattering and Suspended Particulate Matter on a Transect of the Atlantic Ocean at 11°N.- List of Contributors and Participants.