Effect of climate change on the hydrological regime of navigable water courses in Belgium: sub report 8. Implementation and testing of a framework for flexible hydrological modelling
Tran, Q.; Willems, P.; Pereira, F.; Nossent, J.; Mostaert, F. (2021). Effect of climate change on the hydrological regime of navigable water courses in Belgium: sub report 8. Implementation and testing of a framework for flexible hydrological modelling. Version 1.0. FHR reports, 00_130_8. Flanders Hydraulics Research: Antwerp. VIII, 94 pp. https://dx.doi.org/10.48607/89
Part of: FHR reports. Flanders Hydraulics Research: Antwerp, more
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Document type: Project report
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| Keywords |
Climatic changes
Impact analysis
Numerical modelling
Water management > Hydrology
Belgium [Marine Regions]
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| Author keywords |
Distributed and lumped models; Model uncertainty |
| Authors | | Top |
- Tran, Q.
- Willems, P.
- Pereira, F., more
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| Abstract |
The innovative flexible hydrological modelling concept proposed by Tran et al. (2014) was further developed in this inventory. A generalized model structure which consists of the most basic and/or popular hydrological components was constructed. It includes the meteorological components, the storage components, the splitting components, the routing components and a component for closing water balance. Equations from the NAM, PDM and VHM models were used as demonstrations for each components. The additional components can be added by users depending on applications and on the available data.
Since the concept allows flexibility in spatial resolution, the Grid-to-Grid approach for explicitly representation of the hydrological connectivity between gird cells with the catchment is needed. Next to that, the Source-to-Sink approach was also implemented but it was not discussed in details in this report due to its simplicity in implementation. Two schemes of Grid-to-Grid approach were developed: i) the normal routing scheme, in which the interaction between different subflow components are omitted and ii) the detailed routing scheme, which allows to describe more detail the infiltration and percolation processes.
The step-wise methodology for calibration was developed for both lumped and spatial distributed models. For the distributed models, the calibration process starts from the well-calibrated model parameters for lumped case and then uses the catchment characteristics (i.e. the topography map, the land use map and the soil type map) and other additional data (e.g. the groundwater observation, the internal gauging station…) to disaggregate into spatial distributed parameters. Those spatial parameters can be fine-tuned to capture the distribution of the runoff in the whole catchment. The efficiency of the identified model structure is assessed using both traditional statistical indices and the graphical evaluation.
Three conceptual model codes (NAM, PDM and VHM) spatially implemented in the proposed framework were applied for a case study of Grote Nete catchment in Belgium. They were calibrated using the predefined parameters from the lumped models. The comparison of the distributed outputs versus the lumped results and versus the observations at gauging stations indicated good matches, which show that the proposed framework has successfully implemented. Nevertheless, further research is still in need in order to complete the concept. |
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