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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Geomorphic Hazard Analyses in Tectonically-Active Mountains: Application to the Western Southern Alps, New Zealand

Kritikos, Theodosios January 2013 (has links)
On-going population growth and urbanization increasingly force people to occupy environments where natural processes intensely affect the landscape, by way of potentially hazardous natural events. Tectonic plate boundaries, active volcanic regions and rapidly uplifting mountain ranges are prominent examples of geomorphically hazardous areas which today accommodate some of the world’s largest cities. These areas are often affected by more than one hazard such as volcanic eruptions, earthquakes, landslides, tsunamis, floods, storms and wildfires, which frequently interact with each other increasing the total impact on communities. Despite progress in natural hazards research over the last two decades, the increasing losses from natural disasters highlight the limitations of existing methodologies to effectively mitigate the adverse effects of natural hazards. A major limitation is the lack of effective hazard and risk assessments incorporating hazard interactions and cascade effects. Most commonly, the assessment of risks related to different hazards is carried out through independent analyses, adopting different procedures and time-space resolutions. Such approaches make the comparison of risks from different hazard sources extremely difficult, and the implicit assumption of independence of the risk sources leads to neglect of possible interactions among hazard processes. As a result the full hazard potential is likely to be underestimated and lead to inadequate mitigation measures or land-use planning. Therefore there is a pressing need to improve hazard and risk assessments and mitigation strategies especially in highly dynamic environments affected by multiple hazards. A prominent example of such an environment is the western Southern Alps of New Zealand. The region is located along an actively deforming plate boundary and is subject to high rates of uplift, erosion and orographically-enhanced precipitation that drive a range of interrelated geomorphic processes and consequent hazards. Furthermore, the region is an increasingly popular tourist destination with growing visitor numbers and the prospect for future development, significantly increasing societal vulnerability and the likelihood of serious impacts from potential hazards. Therefore the mountainous landscape of the western Southern Alps is an ideal area for studying the interaction between a range of interrelated geomorphic hazards and human activity. In an effort to address these issues this research has developed an approach for the analysis of geomorphic hazards in highly dynamic environments with particular focus on tectonically-active mountains using the western Southern Alps as a study area. The approach aims to provide a framework comprising the stages required to perform multi-hazard and risk analyses and inform land-use planning. This aim was approached through four main objectives integrating quantitative geomorphology, hazard assessments and GIS. The first objective was to identify the dominant geomorphic processes, their spatial distribution and interrelationships and explore their implications in hazard assessment and modelling. This was achieved through regional geomorphic analysis focusing on catchment morphometry and the structure of the drainage networks. This analysis revealed the strong influence and interactions between frequent landslides / debris-flows, glaciers, orographic precipitation and spatially-variable uplift rates on the landscape evolution of the western Southern Alps, which supports the need for hazard assessment approaches incorporating the interrelationships between different processes and accounting for potential event cascades. The second and third objectives were to assess the regional susceptibility to rainfall-generated shallow landslides and river floods respectively, as these phenomena are most often responsible for extensive damage to property and infrastructure, injury, and loss of lives in mountainous environments. To achieve these objectives a series of GIS-based models was developed, applied and evaluated in the western Southern Alps. Evaluation results based on historical records indicated that the susceptibility assessment of shallow landslides and river floods using the proposed GIS-based models is feasible. The output from the landslide model delineates the regional spatial variation of shallow landslide susceptibility and potential runout zones while the results from the flood modelling illustrate the hydrologic response of major ungauged catchments in the study area and identify flood-prone areas. Both outputs provide critical insights for land-use planning. Finally, a multi-hazard analysis approach was developed by combining the findings from the previous objectives based on the concepts of interaction and emergent properties (cascade effects) inherent in complex systems. The integrated analysis of shallow landslides, river floods and expected ground shaking from a M8 plate-boundary fault (Alpine fault) earthquake revealed the areas with the highest and lowest total susceptibilities. Areas characterized by the highest total susceptibility require to be prioritized in terms of hazard mitigation, and areas with very low total susceptibility may be suitable locations for future development. This doctoral research project contributes to the field of hazard research, and particularly to geomorphic hazard analyses in highly dynamic environments such as tectonically active mountains, aiming to inform land-use planning in the context of sustainable hazard mitigation.
2

Změny využití zemědělské krajiny v širších historických souvislostech na vybraných částech zájmového území Novohradska a Stropnicka. / Land use changes of agricultural landscape in selected areas of Novohradsko and Stropnicko in broader historical context.

JIROUŠKOVÁ, Lenka January 2010 (has links)
Changes of land use influence landscape structure, ecological stability, biodiversity and course of biotic and abiotic processes. The intensity of these changes mainly depends on geographic location of the area, land attractiveness and a level of maturity or development of the society. This thesis is focused on evaluation of historical and present changes of land use in Novohradsko and Stropnicko area. This area had in past decades and centuries undergone major landscape changes that are shown on many map sources. These data were elaborated through GIS tools and subsequently analyzed. According to my conclusion, the long- and short-term trends in observed changes of land use have been identified. Since the early 19th Century the arable land area had declined whereas the grasslands had spread out in the studied area. In contrast, recent years resulted in fact that an increase of grass area has stopped which does not coincide with the general effort to grass the LFA.
3

Územní studie „Zbrojovka“ / Town planing study "Zbrojovka"

Bílek, František January 2012 (has links)
The aim of this thesis is a revitalization of the grounds once belonging to Zbrojovka Brno. These grounds are in the zoning map defined as “brownfield”. Within Brno’s limits, the area has an extremely convenient location. Since the grounds are situated in the central part of Brno, the complex is in terms of traffic and transport in the vicinity of both, the current and the newly planned ring-road. Important factors influencing the project are the river Svitava which borders the west side of the area, and a railroad corridor skirting the east side of the location. Assigned area was, for the purposes of this thesis, expanded by the grounds once belonging to Zetor and the adjoining area towards Markéty Kuncové Street. Several buildings from the former grounds, which fit in into the urban concept and were in good technical conditions, have been preserved. From a functional point of view, the newly designed grounds will meet all the requirements for a fully independent municipal district. The multifunctional development contains primarily housing complexes, administrative buildings, public facilities, recreational areas, as well as other functional structures. The urban concept of this project is a result of a study of surrounding blocks. Based on an analysis of the size and height of these buildings, an idealized block was designed and then recreated into a symmetrical raster of blocks with the street width of 20m. This raster was subsequently applied to newly designed points of entry into the area. Total urban and mass proposal of the development areahas been further influenced by principal conceptual points. Among these conceptual points belong the perspective axes which connect the conceptual points with an orientation point, in this case the former factory’s smokestack. Creating a new arm for the Svitava River is another point. Taking into account that the whole vicinity of the factory grounds is without quality public greenery elements.

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