A new book on the 'Ice Age World' - a pictorial feast and more than a fresher's primer!

Andersen, B. G. & Borns Jr., H. W. 1994: The Ice Age World (an introduction to Quaternary history and research with emphasis on North America and Northern Europe during the last 2.5 million years ). Scandinavian University Press.     

The role of current velocity in structuring eelgrass (Zostera marina L.) meadows

Measurements of velocity profiles, bathymetry, and surface sediment characteristics across eelgrass (Zostera marina L.) meadows yielded information on community development processes and functional attributes of this ecosystem. Height/length ratios of the meadows were positively correlated with tidal current velocity. Low, medium, and high current regimes were separated by surface current velocities of approximately 50 and 90 cm s^?1. Z. marina can tolerate approximately 120–150 cm/sec current velocities in the areas studied. Per cent silt-clay and organic matter content of the surface sediments are negatively associated with shear velocity, suggesting that meadows in high current areas are sources while meadows in low current areas are sinks of autochthonous detritus. Current velocity maintains seagrass meadows at different equilibrium levels (relative climaxes). We theorize these different equilibrium levels provide unequal habitat utilization potentials for the associated faunal community.     

Oblique surface-wave diffraction by a cylindrical obstacle

The diffraction of a surface wave that is obliquely incident upon a small, cylindrical deformation of the bottom of a laterally unbounded ocean is calculated by small perturbation theory. The reflection coefficient is found to vanish for an angle of incidence of 45° independently of the shape of the obstacle.