Terrestrial photogrammetric techniques applied to the control of a parabolic dune in the Liencres dune system, Cantabria (Spain)

摘要

The spatial-temporal variations of a dune system can be determined by using diverse 'geomatic' methodologies: geodesy, global positioning system (GPS) and photogrammetry. In the case of the Liencres dune system, a study will be carried out using the 'close-range' photogrammetry technique and the topography technique (total station and GPS). In order to determine the dynamic of the dune system it is necessary to repeat the process of study after a specific interval of time. For this reason, three dimensional data should be available in two different time periods, between which the displacement of the object of analysis (the front portion of the dune) will he significant enough to evaluate its magnitude. This work analyses the viability or photogrammetry For the determination or the spatial-temporal changes of a coastal paraholic dune. Two factors have been analysed: first, the comparison of the photogrammetric results with the results obtained from topographic methods (total station all([ GPS), and second, the quantification of the displacement of the dune system. The analysis of the correspondence between the movement of different parts of the dune and the influence of the intensity and direction of the prevailing wind in the area is also desired. The dune advanced 12-15 +/- 0-06 in (an average of 8.5 m/yr), and the partial implications for the dynamic of human modified processes oil the natural park have been established. Copyright (C) 2008 John Wiley & Sons, Ltd.