The Study of Upper Ocean Stratification that Controls the Propagation of Internal Tidal Bores in Coastal Areas
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Authors
Yanez, Kathryn A.
Subjects
Internal Tidal Bores
Nepheloid Layers
Nepheloid Layers
Advisors
Stanton, Timothy
Shaw, Bill
Date of Issue
2012-06
Date
12-Jun
Publisher
Monterey, California. Naval Postgraduate School
Language
Abstract
Coastal ocean stratification and optical properties have been analyzed over a month period from Moss Landing to Monterey Bay in Monterey, CA during October 2011. This research utilized measurements from four different observing systems the Tethys long-range propeller-driven AUV, a Spray glider AUV, a SeaHorse moored profiler, and a thermistor chain to evaluate changes in conductivity, pressure, temperature, salinity, and optics over a four week time period. Each instrument observed the ocean structure and propagation of internal tidal bores in coastal areas, capturing the strength of the internal tides and their impact on the bed as they shoal and entrain sediment into the upper water column. The main focus of this field study is to identify oceangraphic processes responsbile for heightened bed stress and the suspension of benthic material on the continental shelf. The primary objectives of this experiment are to (1) determine stratification conditions that are conducive for the generation of internal tidal bores in Monterey Bay, (2) track the presence of enhanced near bed sediment concentration and determine the site of maximum suspension, and (3) identify the generation areas of intermediate nepheloid layers. The combination of moored and mobile instruments provides spatial and temporal views of the resuspension of seabed materials and resolves the processes that control the formation of nepheloid layers over the Monterey Bay shelf.
Type
Thesis
Description
Series/Report No
Department
Physical Oceanography