Thesis (M.S.)--University of Hawaii at Manoa, 2006. / Includes bibliographical references (leaves 71-77). / xii, 77 leaves, bound col. ill. 29 cm

Thesis (Ph. D.)--Washington State University, December 2009. / Title from PDF title page (viewed on Dec. 11, 2009). "Department of American Studies." Includes bibliographical references (p. 142-157).

Annually, tropical cyclones do tremendous damage and are agents of long-term coastal change. To test this idea of different tropical cyclones delivering consistent coastal change, a landform with such evolution is needed. One such landform is a spit. What contributions do tropical cyclones give toward the evolution of a spit, and do tropical cyclones give the same kinds of impacts? To determine if tropical cyclones have similar impacts, shoreline and volumetric change from four storms impacting Bolivar Peninsula are considered. Being a southwest-trended spit at a length of 33.5 kilometers, storm impacts are measured in the form of one dimensional shoreline and two dimensional volumetric change. These impacts are abstracted into shoreline change and volumetric change patterns. These patterns are identified and compared for differences between each storm and similarity among all storms. Results indicate that shoreline accretionary zones vary alongshore. Results from Hurricane Ike indicate an accretionary zone ten kilometers from the distal end. Shoreline change patterns for Hurricane Rita show an unstable accretionary zone at four kilometers from the distal end. Results for Tropical Storm Fay indicate an unstable accretionary zone that begins at the distal end and continues to the middle of the spit. In terms of similarity for shoreline change, all patterns from storms demonstrated erosion near Rollover Fish Pass. One dimensional volumetric change patterns were entirely erosive for Hurricanes Rita and Ike, and Tropical Storm Fay had by small zones of accretion near the distal portion of the spit. Tropical Storm Josephine demonstrated an accretion zone between the middle and distal portion of the spit. Results from two dimensional volumetric change patterns suggest a threshold for inland penetration. Tropical Storm Fay showed a ten to twenty meter wide pattern of erosion around five kilometers from the distal end and near the proximal end of the spit, and Hurricane Rita demonstrated a twenty meter wide pattern of erosion near the distal end. Hurricane Ike had erosive penetration of up to 200 meters around fifteen kilometers from the distal end. Results suggest that certain storms reinforce the standard spit growth model, and others work against it.

In August and September of 2005, Hurricanes Katrina and Rita devastated the Gulf Coast with damages estimated at $85 billion. Hurricane Katrina was so devastating that the number of lives lost and injuries sustained is still being calculated. Hurricane Rita, which made landfall in the southwestern part of the Louisiana just a few weeks after Katrina, did not cause as much damage as Katrina but was devastating nonetheless. In both cases, two Louisiana community colleges, Nunez Community College and SOWELA Technical Community College, were damaged to the point that many doubted that either college would have a future. Both community colleges, however, continued classes and are in operation today. This study examines the actions of the institutional leadership at Nunez Community College and SOWELA Technical Community College in the aftermath of Hurricanes Katrina and Rita. A constructivist grounded theory approach was used to conduct case studies on each college. A substantive theory emerged from the findings explaining the resiliency of both institutions. / text

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Evacuation is oftentimes the best means to prevent the loss of lives when residents encounter certain hazards, such as hurricanes. Emergency managers and experts make great efforts to increase evacuation compliance but risk area residents may procrastinate even after making the decision to leave, thus complicating response activities. Purpose - This study explores the factors determining evacuees’ mobilization periods, defined here as, the delay time between the decision to evacuate and actual evacuation. The theoretical model that guides this research is built on the protective action decision model (PADM). It captures both the social and psychological factors in the process of transferring risk information to mobilization action. The psychological process of risk communication originates from personalized external information and ends with the formation of risk perception, ultimately influencing evacuees’ mobilizations. Design/methodology/approach – Using structural equation modeling (SEM), the model is tested using survey data collected from Hurricane Rita (2005) evacuees in 2006 (N = 897). The residents of three Texas coastal counties (Harris, Brazoria, and Galveston) are randomly selected and telephone-interviewed. Findings – The findings indicate that mobilizations are affected directly by respondents’ concerns of the threats to their personal lives and costs and dangers on their evacuation trips. The perceptions of evacuees can be related to their exposure, attention, and understanding of the risk information. Research limitations/implications – The results suggest that practitioners pay more attention on the residents’ understanding of different types of risks, their abilities to process the risk information, as well as the means information is delivered. Therefore the public authorities should be more active in protecting evacuees’ properties and assets, as well as encourage evacuees to take closer shelters to avoid potential costs on road. Also the community should be more involved in mobilizing evacuation, as long as social cues can assist evacuees to better comprehend the threat information. Originality/value – This study tests the PADM framework empirically and structurally. It also clarifies the definition of evacuation mobilization using a new operation based on the evacuation groups per household.

Tropical cyclones (TCs) often change intensity as they move over mesoscale oceanic features, as a function of the oceanic mixed layer (OML) thermal response (cooling) to the storm's wind stress. For example, observational evidence indicates that TCs in the Gulf of Mexico rapidly weaken over cyclonic cold core eddies (CCEs) where the cooling response is enhanced, and they rapidly intensify over anticyclonic warm features such as the Loop Current (LC) and Warm Core Eddies (WCEs) where OML cooling is reduced. Understanding this contrasting thermal response has important implications for oceanic feedback to TCs' intensity in forecasting models. Based on numerical experimentation and data acquired during hurricanes Katrina and Rita, this dissertation delineates the contrasting velocity and thermal response to TCs in mesoscale oceanic eddies. Observational evidence and model results indicate that, during the forced stage, the wind-driven horizontal current divergence under the storm's eye is affected by the underlying geostrophic circulation. Upwelling (downwelling) regimes develop when the wind stress vector is with (against) the geostrophic OML velocity vector. During the relaxation stage, background geostrophic circulations modulate vertical dispersion of OML near-inertial energy. The near-inertial velocity response is subsequently shifted toward more sub-inertial frequencies inside WCEs, where rapid vertical dispersion prevents accumulation of kinetic energy in the OML that reduces vertical shears and layer cooling. By contrast, near-inertial oscillations are vertically trapped in OMLs inside CCEs that increases vertical shears and entrainment. Estimates of downward vertical radiation of near-inertial wave energies were significantly stronger in the LC bulge (12.1X10 super -2 W m super -2) compared to that in CCEs (1.8X10 super -2 W m super -2). The rotational and translation properties of the geostrophic eddies have an important impact on the internal wave wake produced by TCs. More near-inertial kinetic energy is horizontally trapped in more rapidly rotating eddies. This response enhances vertical shear development and mixing. Moreover, the upper ocean temperature anomaly and near-inertial oscillations induced by TCs are transported by the westward-propagating geostrophic eddies. From a broader perspective, coupled models must capture oceanic features to reproduce the differentiated TC-induced OML cooling to improve intensity forecasting.

This study uses the storm surge sediment beds deposited by Hurricanes Audrey (1957), Carla (1961), Rita (2005) and Ike (2008) to investigate spatial and temporal changes in sedimentation rates on the McFaddin National Wildlife Refuge in Southeast Texas. Fourteen sediment cores were collected along a transect extending from 90 to 1230 meters inland from the Gulf Coast. Storm-surge-deposited sediment beds were identified by texture, organic content, carbonate content, the presence of marine microfossils, and Cesium-137 dating. The hurricane-derived sediment beds are marker horizons that facilitate assessment of marsh sedimentation rates from nearshore to inland locations as well as over decadal to annual timescales. Near the shore, on a Hurricane Ike washover fan, where hurricane-derived sedimentation has increased elevation by up to 0.68 m since 2005, there was no measurable marsh sedimentation in the period 2008-2014. Farther inland, at lower elevations, sedimentation for the period 2008-2014 averaged 0.36 cm per year. The reduction in sedimentation in the period 2008-2014 on the nearshore part of the marsh is likely due to reduced flooding in response to increased elevation from hurricane storm surge sediment deposition. These results provide valuable knowledge about the sedimentary response of coastal marshes subject to storm surge deposition and useful guidance to public policy aimed at combating the effects of sea level rise on coastal marshes along the Gulf of Mexico.