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  • 1
    Publication Date: 2021-03-29
    Description: A detailed and comprehensive description of the state of the art in the field of flood forecasting opens this work. Advantages and shortcomings of currently available methods are identified and discussed. Amongst others, one important aspect considers the most exigent weak point of today’s forecasting systems: The representation of all the fundamentally different event specific patterns of flood formation with one single set of model parameters. The study exemplarily proposes an alternative for overcoming this restriction by taking into account the different process characteristics of flood events via a dynamic parameterisation strategy...
    Description: thesis
    Keywords: 551.489 ; UBC 202 ; UA 300 ; Hochwasser (Hydrologie, Flüsse) ; Modellsysteme {Hydrologie}
    Language: English
    Type: monograph , publishedVersion
    Format: 167 S.
    Format: application/pdf
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  • 2
    Publication Date: 2021-03-29
    Description: Sudan as a Sahelian country faced numerous drought periods resulting in famine and mass immigration. Spatial data on dynamics of land use and land cover is scarce and/or almost nonexistent. The study area in the North Kordofan State is located in the centre of Sudan and falls in the Sahelian eco-climatic zone. The region generally yields reasonable harvests of rainfed crops and the grasslands supports plenty of livestock. But any attempts to develop medium- to longterm strategies of sustainable land management have been hampered by the impacts of drought and desertification over a long period of time. This study aims to determine and analyse the dynamics of change of land use/land cover classes...
    Description: thesis
    Keywords: 526.982 ; 550 ; QDB 500 ; Fernerkundung {Geographie}
    Language: English
    Type: monograph , publishedVersion
    Format: 117 S.
    Format: application/pdf
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  • 3
    Publication Date: 2021-03-29
    Description: Diese Doktorarbeit beschreibt Methoden und geeignete Anpassungen bereits existierender Lösungen, um auf zwei verschiedenen Wegen die Landeignung für die Tal- und Beckenregionen der Südsibirischen Altaigebirges innerhalb eines Geoinformationssystems zu modellieren (GIS). Die Ausgangsmethoden sind: 1) die Bodeneignungsmodelle Almagra" and Cervatana (MicroLEIS System), entwickelt für die Mittelmeerregionen (De la Rosa et al. 1992 and 1998) und die Gewichtsmethode, welche Burlakova L. M. (1988) speziell für die Altairegion entwickelte. Letztgenannte Methode basiert auf den gewichteten Mitteln für eine gegebene Anzahl von Faktoren. 2) Zum Vergleich, die zweite, dritte und vierte Version des gleichen Modells mit drei unterschiedlichen Typen wurden mit Fuzzy-Logik-Methoden entwickelt. Sie werden benutzt, um darzustellen, wie unscharfe Mengen zum einen die Berechnung von Gauß-Mitgliedschaftsfunktionen bestimmter Klassen veranschaulichen können, welche zu anderen Klassen gehören, und wie die Variablen in einer mathematischen Handhabung angefasst werden können. Außerdem stellt diese Arbeit Ideen vor, wie die Fernerkundung das Geoinformationssystem (GIS) eingesetzt werden kann, wenn - wie im vorliegenden Fall - nur unzureichend Geodaten vorhanden sind, (i) um in die Modellierung der Boden- und Klimabedingungen einzugehen und (ii) um die Charakteristik des Landmanagements im Untersuchungsgebiet zu kennzeichnen. Drei landwirtschaftliche Agrarkulturen (Sommerweizen, Sonnenblumen und Kartoffeln) sind für die Altairegion auf regionaler Ebene von Bedeutung und wurden daher in die vorliegende Untersuchung einbezogen. Die Bewertung erfolgte nach fünf Eignungskategorien, entsprechend der FAO Klassifikation (1976). Das Uimon-Becken wurde als Untersuchungsgebiet ausgewählt. Soziale und ökonomische Faktoren wurden bisher ausgeschlossen, können aber innerhalb einer weiteren Entwicklungsphase hinzugenommen werden.
    Description: thesis
    Keywords: 333.7 ; QBD 500 ; QBD 700 ; QGG 660 ; Fernerkundung {Geographie} ; Geoinformationssysteme {Geographie} ; Mittelsibirien mit südlichen Randgebirgen {Geographie}
    Language: English
    Type: monograph , publishedVersion
    Format: 256 S.
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  • 4
    Publication Date: 2021-03-29
    Description: Soil and groundwater pollution has become a global issue since the advent of industrialization and mechanized agriculture. Some contaminants such as PAHs may persist in the subsurface for decades and centuries. In a bid to address these issues, protection of groundwater must be based on the quantification of potential threats to pollution at the subsurface which is often inaccessible. Risk assessment of groundwater pollution may however be strongly supported by applying process-based simulation models, which turn out to be particularly helpful with regard to long-term predictions, which cannot be undertaken by experiments. Such reliable predictions, however, can only be achieved if the used modeling tool is known to be applicable...
    Description: thesis
    Keywords: 628.161 ; 551 ; VJF 000 ; Umweltgeochemie insgesamt
    Language: English
    Type: monograph , publishedVersion
    Format: 176 S.
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  • 5
    Publication Date: 2021-03-29
    Description: One of the most important recently issues facing Sudan as well as sub-Sahara Africa is the threat of continued land degradation and desertification, as result of climatic factors and human activities. Remote sensing and satellites imageries with temporal and synoptic view play a major role in developing a global and local operational capability for monitoring land degradation and desertification in dry lands as well as in Sudan. The process of desertification in central Sudan, especially in North Kordofan State has increased rapidly, and much effort has been devoted to define and study its causes and impacts. Taking advantages of the future hyperspectral imagery and developing methods such as spectral mixture analysis (SMA) are recently much recommended as most suitable methods for vegetation studies in arid and semiarid areas. Therefore, this study is intending to improve the monitoring capability afforded by remote sensing to analyse and map the desertification processes in North Kordofan by using SMA technique...
    Description: thesis
    Keywords: 551.4 ; 526.982 ; 550 ; VEO 170 ; VBJ 000 ; Sudan {Geologie} ; Satellitenbildgeologie
    Language: English
    Type: monograph , publishedVersion
    Format: 144 S.
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  • 6
    Publication Date: 2021-03-29
    Description: The toxicity of 36 aliphatic amines on the embryos of the zebrafish Danio rerio were investigated. The DarT (Danio rerio Toxicity assay) was used to determine the lethal concentrations within a 48 h static acute toxicity test. A QSAR (Quantitative Structure-Activity Relationship) was performed using the LC50 values and molecular descriptors such as lipophilicity, maximum positive ...
    Description: thesis
    Keywords: 571.95 ; Teilfragen der Ökosystemforschung {Angewandte Geographie}
    Language: English
    Type: monograph , publishedVersion
    Format: application/pdf
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