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Quantification of overflow volumes - balancing methods vs. hydrodynamic modelling
Art der Abschlussarbeit
Diplomarbeit
Autoren
- Kroll, Stefan
Betreuer
- Prof. Dr. sc. techn. Peter Krebs
- Dr.-Ing. Jens Tränckner
- Dr.-Ing. Frank Blumensaat
Weitere Betreuer
Ir. Geert Drickx (Aquafin NV, Department of research and development)
Abstract
In this case study, the applicability of SOBAL, a rather simple pragmatic approach aiming at quantification of overflow volumes through static volume balancing is investigated for a typical Flemish catchment. Given the low applicability of the original SOBAL, it is further improved to better fit the requirements of the catchment. Finally, the balancing method is compared to two conceptual models in order to evaluate its usability as screening method.
Regarding the total overflow volume over a long simulation period, SOBAL performs fairly well. For short periods, however, the caused errors can still be considerable. Furthermore, some of the CSO structures show significant outliers, even for the total simulation period of 27 years. The application of SOBAL can thus not be advised for the assessment of CSO volumes in rather complex catchments like the one being subject to the case study. Too important is the error, too high the uncertainty of the method. Since also one of the conceptual models faces considerable problems in depicting the CSO volume with acceptable accuracy, the reason for SOBAL’s error might not exclusively be a result of the methods simplicity but may also emanate from the complexity of the catchment itself. Consequently, SOBAL is briefly tested for a second case study. Even though this catchment shows simpler properties than the former one, SOBAL still produces outliers for single CSO structures. Moreover, general rules for setting up a parameterization based on catchment data could not be identified within the scope of this thesis; the method still requires calibration.
As long as the high uncertainty and the need of calibration are not overcome, it should be refrained from an application of the investigated volume balancing method for screening purpose.
Regarding the total overflow volume over a long simulation period, SOBAL performs fairly well. For short periods, however, the caused errors can still be considerable. Furthermore, some of the CSO structures show significant outliers, even for the total simulation period of 27 years. The application of SOBAL can thus not be advised for the assessment of CSO volumes in rather complex catchments like the one being subject to the case study. Too important is the error, too high the uncertainty of the method. Since also one of the conceptual models faces considerable problems in depicting the CSO volume with acceptable accuracy, the reason for SOBAL’s error might not exclusively be a result of the methods simplicity but may also emanate from the complexity of the catchment itself. Consequently, SOBAL is briefly tested for a second case study. Even though this catchment shows simpler properties than the former one, SOBAL still produces outliers for single CSO structures. Moreover, general rules for setting up a parameterization based on catchment data could not be identified within the scope of this thesis; the method still requires calibration.
As long as the high uncertainty and the need of calibration are not overcome, it should be refrained from an application of the investigated volume balancing method for screening purpose.
Schlagwörter
SOBAL, balancing method, conceptual models, screening method
Berichtsjahr
2006