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Marc Geörg [01-2015]:

Ansatz zur Unterstützung der fachlichen Qualitätssicherung von Ergebnissen aus hydrodynamisch‐numerischen Fließgewässermodellierungen mittels räumlicher Analysemethoden

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The Application of computational fluid dynamic (CFD) for one–dimensional (1D) and two– dimensional (2D) hydraulic modelling has been increasingly supported by gaining processing power, sophisticated geospatial data sourcing methods and efficient algorithms. Nowadays the hydraulic modelling of water courses has become daily routine for Hydrology applications. The results are used in disaster management, flood prevention and in other areas. The water level, discharge, flow velocity, water depth and flood extent as well as the digital elevation model containing all hydraulically relevant information can be stated as significant results of these simulations and the associated pre‐ and post‐processing of data. Expert knowledge of complex stream flow characteristics, in both real‐world and simulation environments, is needed to perform the quality assurance (QA) on these results. Within the project “Baden‐Württemberg flood hazard maps” (HWGK), the QA is performed as a visual and individual inspection enclosed by a multi‐level QA‐process on results of 1D and 2D hydraulic modelling. This study examines to what extent spatial analysis methods can support the QA of results derived from 1D and 2D hydraulic modelling. The basis for this research are the nine error categories from ZEISLER (2011). For these categories, he evaluated the QA‐process of the HWGK. His evaluation is based on the period between 2006 and 2011 and considered approximately 4.300 riverkilometres and 770 documented errors. In this Master Thesis, spatial analysis methods are created for these nine error categories using expert interviews and explorative data analyses. The proof of concept will be the implementation of the methods and a comparison between the test results and the results of the QA by HWGK. Furthermore, this thesis examines what data is necessary and which spatial analyses methods are appropriate for the methodology. The result is the methodology, consisting of the spatial analyses methods. It will be documented through verbal descriptions, flowcharts and Map Algebra expressions based on TOMLIN 2012. This kind of documentation provides methodology for the QA that can easily be transferred to other hydraulic modelling.


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