1026 A. Physical Oceanography OLR (1987) 34 (12)

87:6725 Murty, T.S. and D.A. Greenberg, 1987. Numerical

simulation of the storm surge of January 1982 on the south coast of Newfmmdland. Atmos. Ocean, 25(1):46-59. Inst. of Ocean Sci., Dept. of Fish. and Oceans, P.O. Box 6000, Sidney, BC V8L 4B2, Canada.

87:6726 Oltman-Shay, Joan and R.T. Guza, 1987. Infra-

gravity edge wave observations on two California beadles. J. phys. Oceanogr., 17(5):644-663.

Wavenumber-frequency spectra of the infragravity (periods 20-200 sec) wave velocity field in the surf zone are estimated. The longshore arrays of biaxial electromagnetic current meters are relatively short, requiring high resolution spectrum estimators; model testing provides insight into the limits, capabilities and reliability of the estimators used. Low mode edge waves contribute significantly to both the longshore velocity and run-up components of the nearshore infragravity wave field. Coll. of Oceanogr., Oregon State Univ., Corvallis, OR 97331, USA.

87:6727 Petrie, Brian, 1987. Undulations of the Nova Scotia

Current. Atmos. Ocean, 25(1):1-9.

Analysis of infrared images of a surface temperature front off Nova Scotia, taken over a two-week period, reveals horizontal oscillations with a mean wave- length of 50 km and comparable amplitudes. The oscillations travel downstream at a rate of 0.06 m s ~. A comparison is made with a simple model of baroclinic instability; it is possible that this mech- anism could cause the oscillations, but more definite tests and data are required. These oscillations could contribute significantly to the exchange of water between the inner and outer shelves. Bedford Inst. of Oceanogr., Dartmouth, NS B2Y 4A2, Canada.

87:6728 Shaw, R.P. and David Paskausky, 1987. A constraint

on a trapped edge wave solution for convex upward topographies. J. geophys. Res., 92(C6): p.6577.

The authors previously (1986) developed an analyt- ical solution for edge waves trapped along a straight coastline with an exponentially increasing offshore bottom topography. A review of the physical constraints used has led to a reduced range of

validity of those results. Dept. of Civil Engng, SUNY, Buffalo, NY, USA.

87:6729 Sol,i-Morales, J. and M. Val6ncia, 1987. Trend to

spatial homolpmei~ for soimions to semilfmear damped wave equations. Proc. R. Soc. Edinb., 105A:117-126. Dept. de Matematiques, Univ. Autonoma de Barcelona, Bellaterra, Barcelona, Spain.

87:6730 Sugimoto, N., Y. Kusaka and T. Kakutani, 1987.

Reflection of a shallow-water sollton. Part 2. Numerical evaluation. J. Fluid Mech., 178:99- 117.

The offshore behaviour in the shallow-water region is obtained by solving the Boussinesq equation under the 'reduced' boundary condition. Spatial and temporal variations of the surface elevation are displayed for two typical values of the inclination angle of the beach. Nearshere behaviour is then evaluated to obtain surface elevation and velocity distribution in the edge layer. Both offshore and nearshore behaviours furnish a full knowledge of the reflection problem of a shallow-water soliton. To check the applicability of the edge-layer theory, a 'computational experiment' is carried out based on the boundary-element method. Both results show a fairly good agreement except for the surging move- ment at the shoreline. Dept. of Mech. Engng, Osaka Univ., Toyonaka, Osaka 560, Japan.

A170. Wind--wave interactions

87:6731 Grundy, I.H. and E.O. Tuck, 1987. Waves on a static

water surface beneath a layer of movlag air. J. Fluid Mech., 178:441-457.

Computations of such waves are provided both for periodic nonlinear Stokes-like waves, and for a specific wave-making configuration in which the periodic solution appears as the downstream far field. The wavemaker geometry chosen is relevant to the edge region of a hovercraft, and the large- amplitude free-surface disturbance caused by the escaping air is computed as a function of the Froude number based on air-jet velocity and thickness. Appl. Math. Dept., Univ. of Adelaide, GPO Box 498, Adelaide, SA 5001, Australia.