“…Further field research into airflow patterns in dune systems (e.g. Arens et al, 1995;Frank and Kocurek, 1996;Hesp, 2002;Kocurek et al, 1992;Tsoar, 1983;Walker, 1999;Walker and Nickling, 2002) as well as wind tunnel studies and numerical modelling (Parsons et al, 2004a,b;Schatz and Herrmann, 2006 ;van Boxel et al, 1999;Walker and Nickling, 2003) has yielded a more detailed understanding of lee-side air flow. The three broad categories--attached and undeflected flow, attached and deflected flow, and separated flow--determined by Sweet and Kocurek (1990) and modified by Walker and Nickling (2002) are dependent primarily on dune topography and the approach angle of the wind.…”