By Alan P. Dykes, Mark Mulligan, John Wainwright
The days (Obituaries, four August 2008) suggested that "John Thornes used to be essentially the most eminent and influential actual geographers of his generation." John's prepared curiosity in realizing landform procedures and evolution used to be furthered via various tools and expert throughout a number disciplinary barriers. particularly he driven for larger integration of tracking, theoretical and simulation modelling, box and laboratory experimentation and distant sensing concepts. even though ruled by way of an curiosity within the Mediterranean zone and difficulties of land degradation, his study a. �Read more...
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Extra resources for Monitoring and Modelling Dynamic Environments
Vandekerckhove et al. 4 m3 year−1) in the Guadalentín basin by studying 12 gullies over a 40–43‐year time period using aerial photographs. This showed the importance of obtaining medium‐term ero sion rates, which were undoubtedly more reliable. Romero Díaz et al. (2009) estimated the vol ume of soil loss in an area affected by piping processes in Campos del Río (Mula basin). Piping processes were reported for 96 out of the 122 analysed fields. The total surface area of affected plots was 166,417 m2, with an average surface area per plot of 1,983 m2.
The control plot displayed values that were much higher than those in treated plots, independently of the addition rates of USR. A rate of around 10 kg m−2 could be optimal for control of runoff and erosion; higher rates were not necessary and could increase the risk of soil pollution (Albaladejo et al. 2000). 03 t ha−1 year−1). In general, the erosion rates were low due to the existing vegeta tion cover, and the experiments demonstrated the role of high‐intensity rainfall in generating runoff and erosion (Boix‐Fayos et al.
The volume of the accumulated sediments was calculated from a geometric figure which best represented the three‐dimensional shape of the sediment retained by each check dam, in most cases a vertical pyra mid with a trapezoidal base (Hernández Laguna et al. 2004; Romero Díaz et al. 2007b). For those check dams whose sediment wedge did not cor respond very well to the above form, other geo metric figures, and even a combination of several figures, were used. Sediment mass was calcu lated by obtaining samples and determining the density of the material in the laboratory.