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International Institute for Geo-Information Science and Earth Observation (ITC) 2005

Flood simulation : a case study in the lower Limpopo valley, Mozambique using the SOBEK flood model

Shaviraachin, Tumentsetseg

Titre : Flood simulation : a case study in the lower Limpopo valley, Mozambique using the SOBEK flood model.

Auteur : Shaviraachin, Tumentsetseg

Etablissement de soutenance : International Institute for Geo-Information Science and Earth Observation (ITC)

Grade : Master of Science in Geo-Information Science and Earth Observation 2005

Résumé
Mozambique is highly vulnerable to weather-related natural disaster with both drought and floods affecting the country, especially the Limpopo basin. Mozambique has experienced a number of significant flood events in the last 50 years, and the expected effect of climate change could have more severe and frequent flooding in the future. Due to an increase in flood hazard problem, demand of flood information and digital maps of extent and risk of flooding has been increased for planning and evacuation procedures. To produce these maps, GIS, RS and the flood modelling are very useful. The objective of this thesis is to determine areas at hazard of flooding and simulate impact of flood on the population and land cover in different flood type. The Over Land and Channel Flow module of SOBEK two-dimensional model, developed by WL\DELFT Hydraulics in the Netherlands, was used to define areas at hazard and generate flood map for the study area. This research was based on four major steps. The first step was to prepare input data for the modelling, such as DEM, surface roughness map and hydrological data. The Digital Elevation Model (DEM) was generated in 100, 250 and 500 m pixel sizes, based on more than 13000 elevation points using kriging interpolation. Land cover classification from Landsat ETM+ satellite image was done in order to generate surface roughness map. The second step involved the calibration of the model based on data observed during 2000 flooding in Mozambique including DEM, surface roughness, and cross sections of the Limpopo River. The third and the final steps concern simulation and mapping based on model results respectively. The model results consist of set of maps such as flood starting time, flow velocity, and water depth for Mild, Moderate and Severe flood type. The maps for Severe flood type were classified and overlaid to generate the final flood map was generated.

Version intégrale (ITC)

Page publiée le 2 février 2018