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Kungliga Tekniska Hogskolan (1994)

Hydrological modelling and erosion potential : A GIS and remote sensing approach

Chenevey, Roger

Titre : Hydrological modelling and erosion potential : A GIS and remote sensing approach

Auteur : Chenevey, Roger

Université de soutenance : Kungliga Tekniska Hogskolan (Sweden)

Grade : Takn.dr 1994

Résumé
Changes in land use and land cover have a definitive influence on important hydrological processes. Assessment of the impact that these changes have in stream flow generation and erosion can be carried out through physically based semi-distributed models. However, large amounts of data are required. In this regard, data availability in developing countries can be a constraint for water resources planning. This study deals with linking hydrological modelling to a geographic information system (GIS). Also, erosion potential assessment is done through the linkage of an empirical soil erosion model to the GIS. Some of the more relevant data have been extracted from remotely sensed satellite image and analysed in the GIS environment. The project was carried out with field data from Ngezi-South, a semi-arid region in Zimbabwe. It is concluded that the integration of distributed hydrologic modelling, data derived from satellite images and GIS provides an efficient method to assess land cover and land use changes impact in a river basin. Also, the GIS environment offers the possibility of easily identifying areas of interest to the planner for subsequent detailed analysis. The study makes use, to a large extent, of public domain software. All data analyses are carried out in microcomputer frames. This makes feasible the setting up of a similar approach at field levels in developing countries. The modeller should be aware of all possible errors in the data and those others that can be introduced in the analysis procedure. There is a risk that these errors are more difficult to appraise when displaying the results in a colour display.

Mots clés : Applied sciences, Remote sensing, Hydrology, Earth sciences, Zimbabwe

Accès au document : Proquest Dissertations & Theses

Page publiée le 25 février 2015, mise à jour le 17 juin 2017