University of Twente Student Theses


Increasing complexity in hydrologic modelling : an uphill route?

Vermue, H. (2009) Increasing complexity in hydrologic modelling : an uphill route?

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Abstract:The objective in this research was to analyze the influence of adding complexity on model performance and possibly find an optimum complexity considering model performance. The different complexities were analyzed for their influence on model performance, first using a comparison between complexity steps with equal parameter values. This showed the influence of the added complexity as other factors were kept constant. Secondly, calibration parameter values were optimized using an optimization algorithm after which a validation run was done on which model performance was based. This result was used as best possible simulation with the given complexity. Model performance was based on the capability of the model to reproduce measured discharges and spatially distributed phreatic groundwater heads. The different complexity steps are composed of a very simple lumped model consisting of 1 reservoir to a, as most complex step, spatially distributed model composed of a geological fault, 2 aquifers and detailed description of the surface water system with first-order coupling to the groundwater domain. Due to time restrictions it was not possible to test more complex models including unsaturated zone, van Genuchten, equations and an overland flow domain.
Item Type:Essay (Master)
Faculty:ET: Engineering Technology
Subject:56 civil engineering
Programme:Civil Engineering and Management MSc (60026)
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