Lin, Newman K.

Edge waves are the longshore periodic wave motions that are trapped at the edge of water bodies and play an important role in coastal hydrodynamics. This study presents the experimental investigation of the excitation of synchronous edge waves by waves normally and obliquely incident on a uniformly sloping beach. The experimental results show that the edge wave amplitude is linearly proportional to that of the reflected waves. For a perfectly reflecting beach, the conclusion is consistent with the Rockliff model. The experimental results also indicate that the ratio of the edge wave amplitude to reflected amplitude is linearly proportional to the approach angle.

This report presents a detailed approach to the problem of
determining expected shipping delays that are caused by
inadequate channel width. Data collection and analysis is
accomplished for the shipping industry of Tampa Bay,
Florida. Historical data and cargo projection are used to
develop the expected shipping traffic density and
distribution for the year 2000. An overview of a computer
model that simulates the shipping traffic and accounts for
delays due to channel width is presented. A sensitivity
analysis performed on the model to determine the effect
each input variable has on shipping delays. The results are
presented in the form of shipping delay curves for seven
types of vessels over a range of channel widths.

Edge waves are the longshore, trapped waves; their
amplitude diminishes exponentially seaward from the
shoreline. Ursell [1] has shown that there is a family of
edge wave solutions of the shallow water equations, and Ball
[2] provided a normal mode solution for the exponential
beach. This study investigated, experimentally, the
excitation of edge waves on a concave exponential beach by
waves normally incident on the beach. The experimental
investigation included the study of edge wave frequency,
amplitude and particle motions. The results indicated that
resonance occurs under suitable conditions for edge wave
excitation. Viscosity, nonlinearity and defraction at the
beach sidewalls reduced agreement between experiments and
theory. The effects of these parameters on edge waves
should be explored in more detail in further research.

The hydrodynamic interactions between ships in confined waters, restricted in width and depth, is analysed using a numerical surface singularity method called the Panel method. Based on potential flow and rigid free surface assumptions, a source distribution is utilized over the boundary surfaces to model the flow. The strength of the source distribution is obtained on satisfying the normal kinematic boundary conditions, i.e. as a solution of an integral equation. Discretization of the boundary surfaces yields a system of linear algebraic equations corresponding to the boundary integral equation, which then is solved numerically. From the singularity distribution, the velocity components, pressure coefficients and finally the interaction loads are calculated.

The time series method of Auto Regressive Moving Average (ARMA) is applied to
the problem of real time ship motion prediction. The theory of Scalar input
Scalar output ARMA (n, n-1) model and the same extended to multiple series as
vector, ARMAV model have been concisely presented. The field experimental
procedure for roll measurement of vessel at sea and barge model test procedure
for heave and pitch measurements are discussed. The time series data of roll is
analysed as a scalar ARMA (n, n-1) model and the results of prediction are
presented. The model test data of heave, pitch and wave were analysed as ARMAV
(n,n-1) vector model and the results are presented. The model test and
experimental results demonstrate the feasibility of ARMA modeling procedure as a
valuable tool in the area of real time ship motion prediction.