GeoCPM: Geoscientific simulation of all urban drainage procedures with the Complex Parallel Step Method (CPM)
With this Development & Research project the demands of the importance of more precise estimation of flooding securities in the sector of urban hydrology shall be met. After years of pioneer work of the applicants on the use of multi processor technologies in sewer network calculation, it is their aim to put these into the service of a quantitative flooding discharge in urban catchment areas. This way, the implication of more and more precise, multi dimensional geographical and meteorological data for this purpose is improved or made possible at all. This shall not only happen because of the obligatory apply of flooding proofs because of European DIN-standards, but particularly in the context of a necessary and meaningful addition of practical engineer’s work, which must deal with both nationally and internationally risen demands because of more frequent floodings (due to climate).
Flood protection must begin long before the rivers pass over their banks. Long before heavy rainfall occurs, cities and communities must take measures.One essential task of urban drainage systems is the supply of sufficient flood protection of private, commercial and public buildings and allocated estates in the urban territory. Drainage systems are to be construed according to the defined accepted failure frequency for different space utilization in the European and national standards. In order to adjust these security measures to the real conditions in a better way and to be able to intervene preventively, it is the task of this application to be able to represent all urban drainage processes in a geo scientific simulation with the help of a hydrodynamic calculation method and multi processor technology.
Conventional procedures cannot carry this, because water in case of slack flow is held in virtual storages, but is not recirculated to the surface for further discharge. This restriction is caused by the calculation of entries from the surface to the sewage system, which is based on simplified hydrological approaches like linear storage cascades and which do, next to the laminar loads caused by rainfall, not provide any further punctual source terms. This way, only a one-sided coupling between both drainage systems is possible.
The complete bi-directional coupling of duct systems and surface, which is the aim of the applicant tandler.com GmbH and the project partners Pecher & Partner GmbH and the University of Applied Sciences Munich of the Bundeswehr, succeeds with hydrodynamic computation methods for the surface discharge. Such a method is able to compute the change of the water levels in spatially precisely discretized calculation areas exactly to the second and permits not only laminar rain as system loads but also locally and temporarily punctual inductionssuch as the outflow of water out of ducts onto the street space or on other fastened or not fastened surfaces. A very detailed model of the realistic surface is the precondition for such computations. For this, input data of most diverse characteristics is needed. On the one hand, height information in sufficient density must be available, which, due to newest airborne measuring methods, can also be provided in urban territory in the future. Quite often, it is linear as well as objects of little space, which have a great influence on the discharge of the water. Curbstones, street limitations and acclivities for instance belong to these. They must be represented by suitable polygons, which can be handled in the internal geographical information system KANAL++. To be able to process the data of all these detailed information for adequately large areas computationally in a pracicable amout of time, the transmission of the multi core technology developed by tandler.com to the surface computation is indispensable.
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