Modelling dispersion in complex open channel flows: Equifinality of model structure (1) |
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| Authors: | B G Hankin K J Beven |
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| Institution: | (1) Institute of Environmental and Natural Sciences, Lancaster University, Lancaster LA1 4YQ, UK, GB |
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| Abstract: | In a special opportunity, detailed measurements of the flow in an overbank flow in the Flood Channel Facility at HR Wallingford
were used in conjunction with tracer test data to assess the effectiveness of dispersion models based around random particle
tracking (RPT). Ten different RPT models based on different assumptions and levels of information about the nature of the
Lagrangian velocity field were investigated. Multiple simulations were used to calibrate variable parameters controlling the
average magnitude of the perturbations for each model by comparison with observed concentrations at one cross-section. The
calibrated models were then used to predict concentration distributions further downstream. Several of the calibrated models
showed close agreement between observed and predicted concentration distributions. The most complex models using the most
information about the velocity distributions were no better (and in some cases worse) in prediction than the simplest models
investigated. It would appear that our knowledge of the system, despite the quality of the experiments, is too uncertain to
infer a precise model structure. |
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| Keywords: | : dispersion particle tracking random walks overbank flow equifinality |
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