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Physical Sciences and Mathematics Commons

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Research and Technical Reports

1987

Oceanography

Articles 1 - 3 of 3

Full-Text Articles in Physical Sciences and Mathematics

Response Characteristics Of A Short Range, High Resolution, Digital Sonar Altimeter, Malcolm O. Green, John D. Boon Iii Mar 1987

Response Characteristics Of A Short Range, High Resolution, Digital Sonar Altimeter, Malcolm O. Green, John D. Boon Iii

Reports

The Datasonics Model ASA-920 digital sonar altimeter (DSA) is a compact, high frequency (1 MHz), short range (0.5 to 5 m) underwater sonar device originally designed as an altimeter for submersib1es. Wright et al. (1986) have used the DSA successfully to measure changes in relative bed elevation at a point on the shoreface prior to and during a storm. Fixed to a rigid mounting on the seabed, the DSA produces a digital output that is proportional to the transducer elevation above the bed. The purpose of this report is to describe the response characteristics of the DSA.


Field Measurements Of Tidal Currents, I664 Tunnel Axis, Hampton Roads, Virginia : A Report To Morrison-Knudsen/Interbeton, Physical Oceanography Division, Virginia Institute Of Marine Science Jan 1987

Field Measurements Of Tidal Currents, I664 Tunnel Axis, Hampton Roads, Virginia : A Report To Morrison-Knudsen/Interbeton, Physical Oceanography Division, Virginia Institute Of Marine Science

Reports

Currents in the region of Newport News Point of the James River were measured at the request of Morrison-Knudsen/Interbeton to examine maximum flood and ebb values during spring tides and determine first order relationships of current strengths and phase lags between this region and Chesapeake Bay Entrance predictions.


Shoreface And Beach Dynamics Of The Coastal Region From Cape Henry To False Cape, Virginia, L. D. Wright, C. S. Kim, C. S. Hardaway, S. M. Kimball, M. O. Green Jan 1987

Shoreface And Beach Dynamics Of The Coastal Region From Cape Henry To False Cape, Virginia, L. D. Wright, C. S. Kim, C. S. Hardaway, S. M. Kimball, M. O. Green

Reports

The processes which drive the beach and nearshore changes vary considerably in space and time. The spatial variability is the result of modulations of waves and wave induced processes by the complex topography of the shoreface and inner shelf fronting the beaches. In this study we employed a state-of-the-art computer model to evaluate the nature of these modifications and their impact on coastal processes. The model estimates wave modifications by shoaling, refraction, diffraction. and loss of wave energy by frictional interaction with the bottom.