Title page for ETD etd-0708103-012004


Type of Document Dissertation
Author Zhang, Xiongping
Author's Email Address xzhang2@lsu.edu
URN etd-0708103-012004
Title Design and Implementation of an Ocean Observing System: WAVCIS (Wave-Current-Surge Information System) and Its Application to the Louisiana Coast
Degree Doctor of Philosophy (Ph.D.)
Department Geography & Anthropology
Advisory Committee
Advisor Name Title
Gregory W. Stone Committee Co-Chair
Michael Leitner Committee Co-Chair
DeWitt Braud Committee Member
Nina S.-N. Lam Committee Member
Steven Namikas Committee Member
Shih-Ang (S.A.) Hsu Dean's Representative
Keywords
  • Louisiana coast
  • ocean observing system
  • coastal GIS
  • boundary layer
  • tropical cyclone
  • wave
  • surge
  • current
Date of Defense 2003-06-04
Availability unrestricted
Abstract
WAVCIS (Wave-Current-Surge Information System for Coastal Louisiana) was designed to measure meteorological and hydrodynamic phenomena along the Louisiana coast. The information measured includes waves, currents, water depth, surge, turbidity, salinity and meteorological conditions. WAVCIS collects data and transfers it back to the data processing laboratory at LSU through wireless communication. The data undergo post-processing and archiving. Users can access the real-time or archived information through the World Wide Web.

This dissertation utilized the information provided by WAVCIS stations and NDBC buoys during Hurricane Lili and Tropical Storm to examine temporal and spatial variations of storm induced meteorological and oceanographic dynamics. The results show that waves during Hurricane Lili ranged from 1.8 meters in Terrebonne Bay, 6.2 meters offshore at a depth of 20 meters and 12 meters in Central Gulf of Mexico. The track of Hurricane Lili passed over CSI 3 where the peak in significant wave height reached 2.7 meters. The maximum current speeds near sea surface and near bottom generated by Hurricane Lili were 1.8 m/s and 1.1 m/s respectively. During the peak of the storm the water column was dominated by a northwest current. Currents were initially impacted by the storms when they encountered the continental shelf. Within approximately twice the radius of maximum wind (Rw) during Hurricane Lili, the current measured by an ADCP (Acoustic Doppler Current Profiler) exhibited an almost perfect logarithmic profile extending to near the sea surface from the bottom. The range of the estimated shear velocity during the passage of Hurricane Lili was 5-12.5 cm/s. Storm wave energy dumping occurred along the muddy shelf in western Louisiana. Waves generated by Hurricane Lili and Tropical Storm Isidore showed considerable difference in both time and space domains. Wave spectra for Tropical Storm Isidore showed distinct peaks for both swell and wind-driven waves. The wave spectra for Hurricane Lili demonstrated complicated multiple peaks throughout the entire frequency domain. Swells with longer periods tended to survive longer in the space domain and shorter in the time domain. Hurricane Lili generated 1.4 meters of storm surge at CSI 3. The surges appeared lower than modeled estimates.

Files
  Filename       Size       Approximate Download Time (Hours:Minutes:Seconds) 
 
 28.8 Modem   56K Modem   ISDN (64 Kb)   ISDN (128 Kb)   Higher-speed Access 
  Zhang_dis.pdf 8.22 Mb 00:38:03 00:19:34 00:17:07 00:08:33 00:00:43

Browse All Available ETDs by ( Author | Department )

If you have more questions or technical problems, please Contact LSU-ETD Support.