Open Access. Powered by Scholars. Published by Universities.®
Physical Sciences and Mathematics Commons™
Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 4 of 4
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
Response Characteristics Of A Short Range, High Resolution, Digital Sonar Altimeter, Malcolm O. Green, John D. Boon
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.
Plume Monitoring Of Rappahannock And York Spit Channels, Baltimore Harbor And Channels: Phase 1, M. Nichols, R. J. Diaz, Et Al
Plume Monitoring Of Rappahannock And York Spit Channels, Baltimore Harbor And Channels: Phase 1, M. Nichols, R. J. Diaz, Et Al
Reports
A major element and concern necessary for evaluating the environmental impact of dredging operations is the dispersion of finegrained dredged material. The turbid plume generated by draghead agitation and by overflow processes from a hopper dredge can dictate the degree of potential adverse effects. Under certain environmental and aesthetic circumstances control of the plume may be advisable. Although turbid plumes produced by open water disposal operations have been evaluated in many investigations (e.g. Barnard. 1978). detailed field assessments of plumes produced by hopper dredging operations are scarce.
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
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 Jr., S. M. Kimball, M. O. Green
Shoreface And Beach Dynamics Of The Coastal Region From Cape Henry To False Cape, Virginia, L. D. Wright, C. S. Kim, C. S. Hardaway Jr., 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.