By Becker G. F.
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Extra info for A Possible Origin for Some Spiral Nebulae (1916)(en)(8s)
2000). TDR has first been used within landslide research in the 1980s in underground coal mine monitoring (Olalla 2004) and since then applied to several other case studies (Pasuto et al. 2000; Barendse and Machan 2009; Singer et al. 2009; Yin et al. 2010a). The principle of TDR is based on an electric signal sent through a coaxial cable. Shear movements deform the cable which creates a spike in cable signature and depth can be detected from the signal. Laboratory tests of TDR method for detection of shear processes have been performed by Baek et al.
While qualitative interpretation is common, quantitative studies are more rare, probably due to limited availability of good quality photographs, adequately fixed control points and cost (Morgenstern and Martin 2008). However, several landslide related quantitative photogrammetric studies have been described (Maria et al. 2004; Mills et al. 2005; Hu et al. 2008; Liu and Wang 2008; Smith et al. 2009). , is today used routinely to create landuse maps and inventories of landslides (Van Westen 2007).
3, cannot accomodate nonlinear system behaviour, such as complexity, self-organisation or deterministic chaos. Some landslide related research projects, however, exploited for example self-organised criticality for prediction of landslides and forest fires (Turcotte and Malamud 2004), characterisation of landslide evolution (Huang et al. 2008) or analyis of triggering conditions (Stähli and Bartelt 2007). Moreover cellular automata have widely been used to simulate self-organising complex systems in geomorphic research (Smith 1991; Avolio et al.