Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Accueil du site → Doctorat → Pays-Bas → Towards improving gully erosion assessment : coupling object - based image analysis and spatially dynamic erosion modelling (Morocco)

University of Twente (2015)

Towards improving gully erosion assessment : coupling object - based image analysis and spatially dynamic erosion modelling (Morocco)

Shruthi B.V. Chalapathi

Titre : Towards improving gully erosion assessment : coupling object - based image analysis and spatially dynamic erosion modelling (Morocco)

Auteur : Shruthi B.V. Chalapathi

Etablissement de soutenance : University of Twente

Grade : Doctor University of Twente 2015

Descriptif
Erosion, in particular gully erosion is considered as one of the indicators of desertification and a serious threat in arid and semi-arid regions. This research is about integrating object-based approach with erosion modeling to improve gully erosion assessment. The approach is developed for the sub-humid to semi-arid regions of Morocco. The chief aim is to apply process knowledge to classify gullies or gully systems using the spectral information from the multi spectral optical high resolution satellite imagery (HIR), morphometric information derived from the digital elevation model (DEM), geometric details and the contextual information of the objects. The study conceptualize changes in gully system in the context of different stakeholders, to create a sensitive and objective method (by using attribute knowledge favorable to gully related process) for change detection. The study further analyses random forest to classify and predict the gully systems in the absence of HRI. Finally the performance of spatially-distributed erosion model- LISEM is evaluated for currently existing conditions and various scenarios of soil and water conservation methods. The potential users of the approach presented in this study are land managers interested in the location of gullies, the degree of land degradation, and gully dynamics over a period of time for the planning and implementation of soil conservation measures. The approach is also useful for the erosion research community, and can be further extended to provide more information such as gully dimensions and temporal changes of individual gullies.

Presentation

Version intégrale

Page publiée le 6 février 2018