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Morphostructural analysis of Ethiopian Highland based on remote sensing
Kusák, Michal ; Vilímek, Vít (advisor) ; Klimeš, Jan (referee) ; Novotný, Ján (referee)
- Morphostructural analysis of Ethiopian Highland based on remote sensing The morphometric analysis of lineaments, valleys and signs of erosion taken from a digital elevation model (DEM) made it possible to not only confirm most of the conclusions of the morphotectonic development of the area from the previously published results of structural, petrological, tectonic and geochronological analyses from the Ethiopian Highlands, but to also to expand our knowledge by applying several new hypotheses. Faults, lineaments and valleys are predominantly oriented in a direction compatible to the published concepts of the tectonic development of the area. Overall, the most abundant NE-SW and NNE-SSW lines reflect a change of extension from a NW-SE to WNW-ESE direction during the Pliocene (~40ř rotation), in relation to the creation and development of the Main Ethiopian Rift. The most pronounced morphological manifestations of the extension of the MER and western Afar during the Quaternary are confined to the borders of the MER, and the maximum SOLR values indicate a very short-lived effect of the stress field on the development of the landscape. The directions of the Pre-Neogene rift structures to the NW-SE and WNW-ESE are compatible with the oldest elements of the current landscape, i.e. the most developed...
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Morphostructural analysis of Ethiopian Highland based on remote sensing
Kusák, Michal ; Vilímek, Vít (advisor) ; Klimeš, Jan (referee) ; Novotný, Ján (referee)
- Morphostructural analysis of Ethiopian Highland based on remote sensing The morphometric analysis of lineaments, valleys and signs of erosion taken from a digital elevation model (DEM) made it possible to not only confirm most of the conclusions of the morphotectonic development of the area from the previously published results of structural, petrological, tectonic and geochronological analyses from the Ethiopian Highlands, but to also to expand our knowledge by applying several new hypotheses. Faults, lineaments and valleys are predominantly oriented in a direction compatible to the published concepts of the tectonic development of the area. Overall, the most abundant NE-SW and NNE-SSW lines reflect a change of extension from a NW-SE to WNW-ESE direction during the Pliocene (~40ř rotation), in relation to the creation and development of the Main Ethiopian Rift. The most pronounced morphological manifestations of the extension of the MER and western Afar during the Quaternary are confined to the borders of the MER, and the maximum SOLR values indicate a very short-lived effect of the stress field on the development of the landscape. The directions of the Pre-Neogene rift structures to the NW-SE and WNW-ESE are compatible with the oldest elements of the current landscape, i.e. the most developed...
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Classification of landslides in selected areas of the Ethiopian Highland
Schreiberová, Kateřina ; Vilímek, Vít (advisor) ; Kusák, Michal (referee)
CLASSIFICATION OF LANDSLIDES IN SELECTED AREAS OF THE ETHIOPIAN HIGHLAND ABSTRACT This thesis is an introduction to landslides and how they are triggered and occur on the tectonic pattern in the Ethiopian Highland, which borders with the Great Rift Valley. Included in this thesis are types of classifications of landslides. Especially on base of the main mechanics of mass wasting movement are the landslides classified in investigation part. The methodology of landslide investigation is based on remote sensing. Further discussed is the methodology used in landslide investigation in general, as well as the causes of downhill movements in landslide prone areas of the Ethiopian Highland. Keywords: landslides, Ethiopian Highland, remote sensing, elevation
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The susceptibility analysis of slope movements in the Jemma River basin (Ethiopian Highland)
Maca, Vít ; Vilímek, Vít (advisor) ; Kusák, Michal (referee)
Ethiopia like other developing countries depends on domestic agricultural production, struggling with infrastructure and healthcare is also at a low level. Among these factors there is also added impact of catastrophic natural processes. Landslides in this area have caused enormous material damage and also human deaths. Effects of those losses are huge and locals are dealing with them difficuly. Therefore, prevention should be a priority concern. In theoretical part the basic facts about modeling and simulation of landslides susceptibility is presented. Those facts are complemented with specific researches from Ethiopian highlands. Furthermore, it describes the methodology that was used. It compares the real distribution of slope movements against the expected occurrence across the classes of input layers. An essential part of the model is mapping work, supported with terrain work, during which 242 landslides was mapped. Model parameters are: slope, altitude, lithology, land cover, distance from geological boundary and distance to river. Slope was determined as most significant factor. Used methodology is universally applicable and the results it generates match reality well. Key words: slope movements, natural hazards, susceptibility analysis, geomorphology, Ethiopian Highland
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