Hawaii’s pristine ocean and tropical environment is a keystone of Hawaii tourism and the state economy. Water pollution from stormwater and development threatens the beach quality to both residents and tourists. In order to understand the lost nonmarket value, we assess changes in quality of beach characteristics including water and sand quality, swimming safety conditions, and congestion using a Discrete Choice Experiment of recreational beach users. Further, we study willingness to pay (WTP) for water management strategies in Hawaii using another discrete choice experiment, including structural and nonstructural Best Management Practices, testing, monitoring, and educational efforts. Using a mixed logit model, beach quality results suggest similar preferences among resident and tourists. Both groups consistently have higher WTP to avoid poor quality levels versus obtaining excellent levels. Additionally, water quality is the single most important attribute. For the policy discrete choice experiment, both parties exhibit similar ranking of WTP to initiate water quality management strategies, with improved testing methods followed by education having the highest WTP. Lastly, we use Benefit-Cost analysis to find that all significant management strategies may be viable, since WTP is greater than the predicted cost of implementation based on expert opinion of Hawaiian policy leaders.

The project is located in West Plam Beach, Florida. The Design Process Involved with the urban Plan included these structures: an aquarium, outdoor theater, re-designed library, urban park, landscape plan for the Exploratorium, and the designing of the Exploratorium. A model was completed to show the Exploratrium and its relationship to the urban plan. The design for The Bauhaus For Children is the result of doing research on art/ architectural education and the role of the architect. I feel, the architect needs to play the role of an educator.The majority of society have little teaching in the field of art or architecture. This means the architect, responsible to everyone for what he does, should motivate society to learn. This project is located on a site with civic concerns The site was used as the ferry boat landing and now houses the Public Library. With the new design and functions for the site, it fullfills the need for being civic. My design was created from a series of diagramatic models and images. This series of diagrams dealt wth the reading of the city in order to create a design language. I feel, the project has addressed the civic concern through the marriage of science and art. Architecture is more understandable to the public when it tries to blend the language of its setting with that of the image. My project is a result of this marriage. The Bauhaus For Children evolved into a Center within the City Center that educates society about art, architecture, and science. / Department of Architecture

Parallax is integral to the conception of movement in modern architectural space. This research examines the role of architectural parallax in creating dynamic spaces that champion the primacy of perception to reinforce a conceptual narrative. The study is contextualized in the cinematic context of Miami Beach to understand the dynamic quality of its public spaces. An analysis of these spaces studies the role of parallax in reinforcing the city???s scopophiliac meta-narrative of Seeing and being Seen. A final design project is situated within the shifting sociocultural context of Miami Beach today as it strives to reinvent itself into a cultural destination for the high Arts. The chosen site is a historically significant site that has remained as a municipal parking lot for over 70 years, and may not be developed for commercial purposes. The design proposes Collins Cultural Center that draws from the exhibitionist Beach culture of the city and fuses it with the high Arts culture. The aim is to use parallax as an architectural strategy to create a dynamic space for cultural production and exchange. Reframing the cultural imagination of residents and visitors fuels Miami Beach???s momentum towards becoming a future cultural destination for the Arts.

This thesis explores the geomorphic implications of large woody debris (LWD) residing in the backshore of beach-dune systems along the northeastern coasts of Haida Gwaii (Queen Charlotte Islands), British Columbia, Canada. Detailed topographic surveys were employed to quantify seasonal mass balance of the beach-dune systems along two distinctly different coastlines. Erosion and accretion potential models were applied to characterize sediment transport conditions. Holman’s (1986) R2% wave runup model was superimposed on total water levels, to model wave runup exceedence of the beach-dune junction elevation (6.5 m aCD). Modelled ‘erosion potential’ hours were demonstrated to correspond with observed erosion including removal of the LWD zone, resulting in decreased mass balance. Similarly, Fryberger and Dean’s (1979) Drift Potential model was used to model accretion potential hours. Modelled accretion potential hours were also able to effectively describe conditions when actual accretion occurred. The presence of LWD in the backshore offered two functions to the above processes: it acted effectively as an ‘accretion anchor’, promoting increased mass balance and rebuilding of the incipient foredune; and, it offered a mass of sediment fronting the foredune to protect the beach-dune system from storm wave attack and subsequent erosion.

The development and testing of a shear cell for the purpose of measuring swash zone bed shear stress is presented. Direct measurements of bed shear stress were subsequently obtained using the shear plate in small, medium, and large-scale laboratory facilities. Measurements from both dam- break and bore-driven swash experiments are considered, covering a wide range of hydrodynamics and bed roughness. The dam-break problem is of interest here due to the theoretical analogy with the run-up of a solitary bore on a beach. Estimates of the flow velocities through the full swash cycle were obtained through numerical modelling and verified against measured velocity data. In conjunction, these data are used to calculate skin friction coefficients. The measurements indicate strong temporal and spatial variation in bed shear stress throughout the swash cycle, and a clear distinction between the uprush and backwash phase. For a single swash event, the maximum uprush bed shear stresses occur in the lower swash zone, within the range 0<x/Rx<0.3. The maximum backwash bed shear stresses also occur in the lower swash zone, and extend seaward of the initial bore collapse location. For a given cross-shore location the peak uprush bed shear stress is typically greater than the peak backwash bed shear stress by at least a factor two and up to a factor four. Local skin friction coefficients also indicate strong temporal and spatial variation. Furthermore, the behaviour of the local skin friction coefficient (back calculated from the measured bed shear stress using predicted, depth-averaged, flow velocities) over the swash cycle is inconsistent with the classical behaviour that is expected on the basis of the low Reynolds number flow. Smooth bed dam break and swash uprush friction coefficients appear to follow the general behaviour observed for smooth, turbulent open channel flow for an increasing Reynolds number. However, for a decreasing Reynolds number the behaviour of Cf differs from the steady flow relation. This is attributed the unsteady swash flow regime and flow history effects. It is expected that differences in flow history between the uprush and backwash have implications in terms of swash boundary layer growth and the resulting bed shear stress. A Lagrangian model for the swash boundary layer development is presented to consider these flow history effects. The model is based on the momentum integral approach for steady, turbulent, flat-plate boundary layers, with appropriate modifications to account for the unsteady flow regime. Fluid particle trajectories and velocity are computed and the boundary layer growth across the entire swash zone is estimated. Predictions of the bed shear stress agree well with the direct bed shear stress measurements and show a bias toward uprush sediment transport which has consistently been observed in measurements.

There are only a few detailed measurements of the cross-shore variation in the net sediment transport and beach evolution for single or multiple swash events, and no data showing the influence of long waves and wave groups on swash zone morphology. Novel laboratory experiments and numerical modeling have been performed to study the influence of long waves and bichromatic wave groups on sediment transport and beach morphodynamics in the swash zone. Due to complex processes, difficulties in measuring, and very significant difficulties in isolating the morphodynamic processes induced by long waves and wave groups on natural beaches, a laboratory study was designed to measure in very high detail the bathymetric evolution of model sand beaches under monochromatic waves, long wave and short wave composites (free long waves), and bichromatic wave groups (forced long waves). Net sediment transport, Q(x), and beach morphology changes under the monochromatic waves were analyzed and compared to conditions with and without the free long waves, and then compared with the bichromatic wave groups. A range of wave conditions, e.g., high energy, moderate energy, and low energy waves, were used to obtain beach evolution ranging from accretionary to erosive, and including intermediate beach states. Hydrodynamics parameters, e.g., instantaneous water depths, wave amplitudes, run-up and rundown, were also measured to study and test a sediment transport model for the swash zone, based on modifying the energetic-bedload based sediment transport equations with suspended sediment. The experimental data clearly demonstrate that for the monochromatic wave conditions, beach evolution develops erosion for high steepness waves and accretion for lower steepness waves. The model beach profile evolutions are similar to natural beaches, and form and develop bars and berms over time. Adding a free long wave to the short wave in the composite wave results in changes to the overall trend of erosion/accretion of the beach profile, but the net transport pattern does not change significantly. The short wave strongly dominates beach behavior and the net transport rate, instead of the free long wave in the composite wave. The free long wave, however, carries more water and sediment onshore, leading to an increase in shoreline motion and wave run-up further landward. The long wave influences the structure and position of the swash bar/berm, which generally tends to move onshore and forms a larger swash bar/berm for higher long wave amplitudes. The free long wave also increases overall onshore sediment transport, and reduces offshore transport for erosive conditions. The long wave tends to protect the beach face and enhances onshore transport for accretive conditions, especially in the swash zone. In contrast, for bichromatic wave groups having the same mean energy flux as their corresponding monochromatic wave, the influence on sediment transports is generally offshore in both the surf and swash zone instead of onshore. The swash berm is, however, formed further landward compared with the berm of the corresponding monochromatic wave. The sediment transport patterns (erosion or accretion) generated by the bichromatic wave group or corresponding monochromatic wave are similar, but differ in magnitude. The numerical model, starting in the inner surf zone to reduce the effect of poor breaker description in the non-linear shallow water equations, can produce a good match between observed data and the modeled hydrodynamics parameters in the SZ. The sediment transport model shows the important role of suspended sediment in the swash zone. In contrast with the observed data, energetic-based bed-load models predict offshore sediment transport for most wave conditions because of negative skewness. The modified sediment transport model, with added suspended sediment terms and optimized coefficients, produces a good match between model results and observed data for each wave condition, especially for low frequency monochromatic waves. The optimized coefficient set corresponding to particular monochromatic wave conditions can be used to predict the net sediment transport quite well for some composite wave conditions. Overall, the same optimized coefficient sets can be applied to predict the correct overall trend of net transport for most composite wave conditions. However, the predicted net transport for the bichromatic wave groups does not match well with the overall net transport patterns. There is no set of single transport coefficients that can be used to predict sediment transport for all wave conditions. This suggests that the present sediment transport models cannot predict evolution correctly, even for conditions which represent only perturbation from those for which they were calibrated.

There are only a few detailed measurements of the cross-shore variation in the net sediment transport and beach evolution for single or multiple swash events, and no data showing the influence of long waves and wave groups on swash zone morphology. Novel laboratory experiments and numerical modeling have been performed to study the influence of long waves and bichromatic wave groups on sediment transport and beach morphodynamics in the swash zone. Due to complex processes, difficulties in measuring, and very significant difficulties in isolating the morphodynamic processes induced by long waves and wave groups on natural beaches, a laboratory study was designed to measure in very high detail the bathymetric evolution of model sand beaches under monochromatic waves, long wave and short wave composites (free long waves), and bichromatic wave groups (forced long waves). Net sediment transport, Q(x), and beach morphology changes under the monochromatic waves were analyzed and compared to conditions with and without the free long waves, and then compared with the bichromatic wave groups. A range of wave conditions, e.g., high energy, moderate energy, and low energy waves, were used to obtain beach evolution ranging from accretionary to erosive, and including intermediate beach states. Hydrodynamics parameters, e.g., instantaneous water depths, wave amplitudes, run-up and rundown, were also measured to study and test a sediment transport model for the swash zone, based on modifying the energetic-bedload based sediment transport equations with suspended sediment. The experimental data clearly demonstrate that for the monochromatic wave conditions, beach evolution develops erosion for high steepness waves and accretion for lower steepness waves. The model beach profile evolutions are similar to natural beaches, and form and develop bars and berms over time. Adding a free long wave to the short wave in the composite wave results in changes to the overall trend of erosion/accretion of the beach profile, but the net transport pattern does not change significantly. The short wave strongly dominates beach behavior and the net transport rate, instead of the free long wave in the composite wave. The free long wave, however, carries more water and sediment onshore, leading to an increase in shoreline motion and wave run-up further landward. The long wave influences the structure and position of the swash bar/berm, which generally tends to move onshore and forms a larger swash bar/berm for higher long wave amplitudes. The free long wave also increases overall onshore sediment transport, and reduces offshore transport for erosive conditions. The long wave tends to protect the beach face and enhances onshore transport for accretive conditions, especially in the swash zone. In contrast, for bichromatic wave groups having the same mean energy flux as their corresponding monochromatic wave, the influence on sediment transports is generally offshore in both the surf and swash zone instead of onshore. The swash berm is, however, formed further landward compared with the berm of the corresponding monochromatic wave. The sediment transport patterns (erosion or accretion) generated by the bichromatic wave group or corresponding monochromatic wave are similar, but differ in magnitude. The numerical model, starting in the inner surf zone to reduce the effect of poor breaker description in the non-linear shallow water equations, can produce a good match between observed data and the modeled hydrodynamics parameters in the SZ. The sediment transport model shows the important role of suspended sediment in the swash zone. In contrast with the observed data, energetic-based bed-load models predict offshore sediment transport for most wave conditions because of negative skewness. The modified sediment transport model, with added suspended sediment terms and optimized coefficients, produces a good match between model results and observed data for each wave condition, especially for low frequency monochromatic waves. The optimized coefficient set corresponding to particular monochromatic wave conditions can be used to predict the net sediment transport quite well for some composite wave conditions. Overall, the same optimized coefficient sets can be applied to predict the correct overall trend of net transport for most composite wave conditions. However, the predicted net transport for the bichromatic wave groups does not match well with the overall net transport patterns. There is no set of single transport coefficients that can be used to predict sediment transport for all wave conditions. This suggests that the present sediment transport models cannot predict evolution correctly, even for conditions which represent only perturbation from those for which they were calibrated.

Thesis (D. Min.)--New Orleans Baptist Theological Seminary, 1993. / Includes abstract and vita. Includes bibliographical references (leaves 119-124).

Major Paper (M.U.R.P.)--Virginia Polytechnic Institute and State University, 1993. / Abstract. Includes bibliographical references (leaves 68-71). Also available via the Internet.

Thesis (Honors)--College of William and Mary, 2008. / Includes bibliographical references (leaves 80-85). Also available via the World Wide Web.