The Department of Civil and Environmental Engineering is pleased to announce Songwei Qi's MS thesis defense: "Use of International Hydrographic Office Tidal Data for Improved Tidal Prediction."
Date: Friday, August 17, 2012
Time: 1:30 pm
Location: EB 202L (CEE Conference Room in Suite 200)
Adviser: Dr. Edward Zaron
Summary: The International Hydrographic Organization (IHO) tidal data bank consists of over 4000 tide gauge stations distributed around the globe, most of which are in coastal regions. These tide gauge data may be used for assimilation into hydrodynamic tide models, but the data bank was assembled though voluntary contributions over many years is not well-documented. One drawback of the IHO data is that a considerable number of stations are located in rivers or near man-made structures or complicated topographic features. Another drawback is the unknown accuracy of the IHO data. To avoid these drawbacks, quality control has been done in the present study. Each IHO tide gauge station has been categorized according to its proximity to rivers, lagoons, man-made harbors, and other factors that may influence tidal elevation. Quantitative metrics such as water depth, distance to the continental shelf break, and horizontal length scale of station site morphology have been computed. Comparisons among IHO data, the output of OSU Tidal Inversion Software (OTIS), and other data sources, such as Global Sea-Level Observing System (GLOSS) data, have been done to test the quality and accuracy of IHO data. Moreover, the characteristics of stations with large error were also examined.