Thesis (M.C.E.)--University of Delaware, 2005. / Principal faculty advisor: James T. Kirby, Dept. of Civil & Environmental Engineering. Includes bibliographical references.

No description available.

Thesis (doctoral)--Technische Universiteit Delft, 1997. / Also published in the series: Communications on hydraulic and geotechnical engineering ; no. 97-4. Vita. Includes bibliographical references (p. [127]-136).

Thesis (doctoral)--Technische Universiteit Delft, 1997. / Also published in the series: Communications on hydraulic and geotechnical engineering ; no. 97-4. Vita. Includes bibliographical references (p. [127]-136).

Thesis (Ph. D.)--Harvard University, 1982. / Includes bibliographical references (leaves 205-211).

Thesis (M.E.E.)--University of Delaware, 2006. / Principal faculty advisors: Kenneth E. Barner, Dept. of Electrical and Computer Engineering; and Mohsen Badiey, Dept. of Marine and Earth Studies. Includes bibliographical references.

No description available.

Spectral wind wave models seek to solve a four-dimensional energy (or action) balance equation for values of the spectrum discretized in frequency and direction of propagation at fixed positions in space. When modeling an ocean area of any appreciable size, computational time and storage capacity limit resolution to relatively coarse grids in all four dimensions. Propagation schemes used in these models, typically the 1st order upwind scheme, encounter difficulty arising from the poor directional resolution (typically 30 degrees) in regions of varying depth and current where wave energy is refracted and concentrated into a small number of directional bins. Since the widely used 1st order upwind scheme is not appropriate for such a rapid bin to bin variation, higher order numerical schemes are investigated to identify one which will produce better results for this wind wave propagation problem. After evaluating the characteristics and performance of the 2nd-order upwind scheme, Lax-Wendroff scheme, and modified Lax-Wendroff scheme suggested by Gadd, for both steady and transient cases, a new propagation scheme is proposed using a time-splitting method and a limiter which combines the modified Lax-Wendroff scheme with the 1st order upwind scheme. For varying depth and current fields, it is shown that the new scheme gives results superior to the ordinary 1st order upwind scheme without any increase of storage capacity at an increased cost in computing time which is minor to the overall wind wave model. / Ph. D.

Waves in the North Atlantic are strongly seasonal, and peak in the winter season. The west coast of Portugal is exposed to winter swell, generated by wind associated with North Atlantic extratropical cyclones. The track of these storms, generated near the North America east coast, is strongly influenced by the North Atlantic Oscillation (NAO). When the NAO is in its positive phase they normally track northeast and reach Western Europe well north of the Iberian Peninsula, in the British Islands or Scandinavia. However, in the negative NAO situation,the track of the storms is more zonal and south than usual, due to a weakened NAO. The characteristics of wave regime in Portugal are shown to be strongly related to the NAO phase and corresponding storm tracking. Positive NAO storms, tracking northeast towards the north of Europe, drive longer period swell from the northwest, whereas negative NAO storms have associated shorter period swell arriving to Portugal from a more westerly direction. The relation between the NAO phase and the storm tracks and the characteristics of the wave regime is investigated with ten year observations from four directional waverider coastal buoys, located off the coast of Portugal.

Lake Kinneret is Israel's only fresh water lake (unless you count the Dead Sea). It spans roughly 20km from north to south, and about 12km at its widest east west extent. It is not quite 50m deep at its deepest point. In late spring, the lake stratifies significantly and remains stratified throughout the fall. During the time the lake is stratified, it exhibits low horizontal mode semi-diurnal inertial motions in response to surface forcing from diurnal winds. This internal motion is known to be important in the ecological and chemical balances of the lake, and is suspected to be responsible for episodes in which large numbers of fish are killed. The physical response of the lake to wind forcing is studied. The lake hydrodynamics is approximated by a (x,y,t) two and three layer model on the f-plane (rotating frame) with detailed bathymetry. The numerical method for the integration of the nonlinear partial differential equation is presented, as well as, the generation of the elliptic grid used in the spatial discretization of the Kinneret domain. A suite of numerical simulations are compared to the available data in the northwestern part of the lake. The nonlinear effects, as well as, the sloping beach problem are discussed in the appendixes. / Graduation date: 2000