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Universität für Bodenkultur Wien (2011)

Application of GIS and remote sensing as tools for studying impacts of soil erosion by water

Rattanaareekul, Warakorn

Titre : Application of GIS and remote sensing as tools for studying impacts of soil erosion by water

Auteur : Rattanaareekul, Warakorn

Université de soutenance : Universität für Bodenkultur Wien

Grade : Doctor rerum naturalium technicarum (Dr. nat. tech.) 2011

Résumé
This thesis topic is to assess soil loss, sediment yield and surface runoff in Dharabi Watershed, Pakistan based on available soil properties, landuse, and topography on cell calculation by using GIS interfaces with WEPP. The main objectives are 1) to study on the impact of different GIS and Remote Sensing input data on soil erosion parameters derive from WEPP, 2) to evaluate the impact different of Aster satellite imagery from different periods on the amount of soil loss, and 3) to evaluate the impact of different resolution and input data on soil erosion simulation. The investigated spatial resolutions of input data were 30 m, 60 m, and 90 m. The results showed that the simulated area decreased as well as the amounts of hillslopes and channels were also reduced. Calculated runoff was 26.5, 26.2, and 25.3 mm.yr-1 for 30 m, 60 m, and 90 m resolution maps, respectively. The corresponding average soil loss was 52.3, 54.3, and 45.3 t.ha-1.yr-1, and the sediment yield was 14.5, 15.5, 14.3 t.ha-1.yr-1, respectively. The 100 years simulation results predicted an average surface runoff of 66.1, 66.8, and 64.5 mm.yr-1, respectively. The predicted average annual soil loss was 94.0, 103.9, and 90.1 t.ha-1.yr-1 with an annual sediment yield of 37.4, 41.6, and 38.6 t.ha-1.yr-1, respectively. The simulation showed that topology had the highest impact on soil loss. The finest spatial resolution/high quality of input maps could potentially offer high accuracy simulated soil erosion results from WEPP model. Resolution plays a very important role in minimizing the errors

Mots clés : Bodenabtrag / Bodenerosion / Bodenerosionsmodell / Sedimentaustrag / Oberflächenabfluss / Geographisches Informationssystem / Fernerkundung — Soil Loss / Soil Erosion / Soil Erosion Model / Sediment Yield / Surface Runoff / Geographic Information System / Remote Sensing

Présentation (österreichischen Bibliothekenverbundes)

Page publiée le 21 novembre 2015, mise à jour le 13 mars 2019