Aeolian dynamics of beach scraped ridge and dyke structures

Dynamics of aeolian sand ripples

We analyze theoretically the dynamics of aeolian sand ripples. In order to put the study in the context we first review existing models. This paper is a continuation of two previous papers[3, 4], the first one is based on symmetries and the second on a hydrodynamical model. We show how the hydrodynamical model may be modified to recover the missing terms that are dictated by symmetries. The sym...

Macroinfauna of Wainui Beach, Gisborne - impact of beach protection structures

Dynamics and Self-organization in Aeolian Ripples

Aeolian ripples arise instantaneously from sandy beds subjected to winds sufficient to cause saltation to surface grains. It is now widely believed that the process of ripple formation is a self-organizing phenomenon involving non-linear dynamics in the variation of flux of secondary grains that are ejected through saltation. In addition, the metric entropy and interaction matrix of the system ...

Dynamics of particles in aeolian saltation

In aeolian transport saltation is an important link by which momentum is transmitted from the air to the bed through grain impact, but momentum transfer, impact and subsequent entrainment take place in a very shallow layer at the air-bed interface with large velocity gradients. Consequently, experimental evidence on the impact-entrainment processes has been obtained from few and simplified stud...

Tasmanian Beach Ridge Systems in Relation to Sea Level Change

Both sand and pebble beach systems in Tasmania show an overall decrease in height seaward which may be correlated with a fall of sea-level occurring while they were being formed. This fall from the postglacial Milford shoreline was of the order of 2 or 3 ft. in south-eastern Tasmania, but about 5 or 6 ft. elsewhere.