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Investigations of the possibilities of hybrid sewer modelling
Art der Abschlussarbeit
Diplomarbeit
Autoren
- Fischer, Anita
Betreuer
- Prof. Dr. sc. techn. Peter Krebs
- Dr.-Ing. Frank Blumensaat
Weitere Betreuer
Ir. Johan van Assel (Aquafin NV, Department of research and development)
Abstract
With increased computer performance and data processing functionalities, there has been a tendency in the last few years to apply detailed hydrodynamic sever modeling for long-term simulations, with long-time series of rainfall. Although, this is now fairly realistic for small networks, there is still a clear limit as to what can be done in the case of running bigger models for a long time, which need a lot more computational effort. Therefore, the idea has grown to investigate the possibilities of hybrid sewer modeling, a combination of conceptual models and detailed models. Certain conceptual simplifications are therefore incorporated in the detailed deterministic modeling environment, trying to combine the advantages of both models, the speed of conceptual models and the accuracy of detailed models. The approach is applied to a typical catchment in Flanders. Finally the simulation results of the hybrid model, carried out using the InfoWorkTM modeling package, are compared with the results of the detailed model in order to evaluate the simplification.
Starting with stepwise simplifications on individual subbasins, the investigation of the results for throttle pipes, ‘sotrage nodes’ and weirs based on different simulations with different composite design storms and a historical rainfall series of 27 years, give fairly good results compared to the detailed model. However, when linking all simplified subbasins together the results get worse, since the influence of the individual subbasins on each other is too high. The errors occurring in an upstream subbasin are transferred to the next downstream subbasin and so on, which finally leads to an accumulation of all the errors and therefore worse results than in the detailed model. Further on the investigation show that it is not possible to obtain a perfect match for all investigated criteria, so that the main focus are the spill events.
Starting with stepwise simplifications on individual subbasins, the investigation of the results for throttle pipes, ‘sotrage nodes’ and weirs based on different simulations with different composite design storms and a historical rainfall series of 27 years, give fairly good results compared to the detailed model. However, when linking all simplified subbasins together the results get worse, since the influence of the individual subbasins on each other is too high. The errors occurring in an upstream subbasin are transferred to the next downstream subbasin and so on, which finally leads to an accumulation of all the errors and therefore worse results than in the detailed model. Further on the investigation show that it is not possible to obtain a perfect match for all investigated criteria, so that the main focus are the spill events.
Schlagwörter
hybrid sewer modeling, conceptual model, detailed deterministic model, linear reservoir model, InfoWorkTM
Berichtsjahr
2006