Mr. Walters, 50, received a master's in marine biology in 2009 from Hofstra University, where he did his thesis on the migration habits of sand tiger sharks.
The migration rate of sand dunes is important for the design of the sand-control system in the Taklimakan Desert.
Although previous CA models for aeolian dunes have attributed the bedform generation to changes in the saltation length, in the present study, which employs a stochastic model, we consider changes of the migration speed of sand particles that are in continuous contact with the bed (i.e., sand that moves no faster than one cell per time step).
Although the calculated rates are generally low in comparison to other measured migration rates of sand dunes in the east of Saudi Arabia, the spatial analysis implies potential hazards of active dunes against many landuse components such as roads, powerlines, and recreational facilities in the study area.
We propose the loess was transported from the regional source along a surface of transport produced by migration of eolian sand through low-relief landscapes including the glacial Lake Wisconsin basin.
Probability of sand migration by bedload transport, depending on the state at position (i, j).
If the bed is perfectly uniform, sand may be transported everywhere at a constant rate, but otherwise, the rate of sand migration depends on the location.
Statistical examination of meteorological variables in this study indicates that 24% of the variation of sand dune migration rates is attributed to temperature, precipitation and wind speed, which is increased to 45% when incorporating lag time.
Migration of silt, clay, and sand production as a result of high production rates; precipitation of salts from solution; and evolution of free gas near the wellbore can reduce permeability near the wellbore.
