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Information - HS25 Effective processes and parameter identification in the unsaturated zone
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Event Information |
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Confronted with the complexity and spatial and temporal variability of vadose zone processes, and the difficulty of performing controlled experiments, a variety of subsurface hydrologic models have been developed to simulate the various hydrologic processes in the vadose zone. Even the most elaborate physically-based vadose zone model, however, cannot reflect the true complexity and heterogeneity of the processes occurring in the field, because to some degree, it must always conceptualize and aggregate complex interactions driven by a number of spatially distributed and highly interrelated water, energy, and vegetation processes by the use of only relatively simple mathematical equations. Therefore, most (if not all) of the parameters in subsurface hydrologic models represent effective processes in space and time, which are not easily observable or measurable at all at the scale of interest, and therefore cannot readily be inferred from direct measurable quantities. Instead, the typical way to estimate the model parameters is to adjust them in such a way that the input-output behavior of the model mimics measurements of the underlying vadose zone system. This session invites contributions connecting and integrating observations with modeling results (inverse modeling, data assimilation, or other new modeling techniques) to estimate effective/equivalent vadose zone processes. Contributions related to parameter identification, uncertainty estimation, and model structural failure identification are particularly welcomed. Interests also lie in new data sources/measurement techniques that show potential strength in improving our understanding of vadose zone processes.
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