DEVELOPMENT OF A METHOD USING SATELLITE REMOTE SENSING DATA FROM LANDSAT TM AND SPOT TO MONITOR AND PREDICT SOIL EROSION AND SEDIMENTATION PROCESSES IN THE AREA OF THE MEDITERRANEAN.
A methodology to elaborate and evaluate risk of erosion maps has been developed using satellite images for a test area located in a southeastern river basin of Spain.
Fragility and erosion risk maps for each of the test areas have been obtained by means of data processing. Each of the thematic maps achieves a cumulative assessment on erosion processes intensity although it is also possible to reach a quantitative approach by extrapolating properly the tabular data from the universal soil loss equation (USLE) factors to each of the basins.
The documents' validity has been proved in contrast to previous studies and it has been shown that the amount of information supplied by digital data is larger than that obtained from different sources (mainly cartographic ones).
The maps of the Spanish zone show vast areas where the classification of erosive processes magnitude is very high. This fact means that there is an urgent need for protection plans to hold back the fast progress of these kinds of processes. In the French zone, there are also places where the erosion intensity is high but, with a local character.
The operating environment is as follows :
Software: ILWIS (integrated land and water information system);\Hardware: IIS imaging system
THE PROJECT CONSISTS OF TWO PHASES:
IN THE FIRST PHASE, EROSION AND SEDIMENTATION PHENOMENA ON TWO TEST SITES IN THE MEDITERRANEAN AREA, THE VALLEY OF RIO ADRA IN ANDALOUSIA AND THE TORRENTS OF TET, TECH AND AGLY IN THE REGION OF PERPIGNAN, FRANCE. THE IMPACT OF NATURAL AND ANTHOPIC PHENOMENA ON THE EROSION PROCESS WILL BE ANALYSED AND A METHODOLOGY USING SATELLITE REMOTE SENSING DATA TO DESCRIBE THE EROSION AND SEDIMENTATION PROCESSES WILL BE DEVELOPED.
IN THE SECOND PHASE, EROSION AND SEDIMENTATION WILL BE MEASURED QUANTITAVELY ON AN EXPERIMENTAL SITE IN THE VALLEY OF THE RIO ADRA IN ORDER TO CALIBRATE AND QUANTIFY THE MODEL. THE MODEL WILL BE APPLIED AND TESTED ON A REGIONAL SCALE USING A DIFFERENT SET OF LANDSAT AND SPOT REMOTE SENSING DATA.