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Information - HS41 Erosion and sediment yield modelling at large basin scales (co-listed in GM)
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Event Information |
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Erosion and sediment transport processes in large basins (i.e. 100 - 100,000 km2) can be described by different physical, conceptual or statistical models. Small and medium scale physical models can be linked to allow detailed description of processes in large catchments. Data with a corresponding spatial and temporal resolution are required for calibration and validation of the model components. Upscaling of erosion and sediment transport processes and quantifying effective model parameters is a key issue (e.g. what are the dominant parameters at the different scales?). Large scale models integrate local or regional intermittent erosion and deposition processes in the river network resulting in the sediment yield of the whole catchment. Model calibration and validation can be based on different data such as discharge rating curve, water volume, sediment transport rate, suspended sediment concentration, sediment mass balance etc. Large scale models need data averaged on a weekly, monthly or annual basis rather than short term events. Data must be compatible with the objective and the model scale with regard to their spatial and temporal density, uncertainty and representativeness. Remote sensing is likely to be an important source of future data, especially as accurate new capabilities for determining sediment transport and changes in ground surface elevation and channel cross section are now being developed. Model parameter sensitivity tests are useful for data and model quality assessment, and more particularly to test the sensitivity of the model results accuracy according to the necessary simplification of process description imposed by the upscaling to larger areas. Papers on any of these aspects are welcome.
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Preliminary List of Solicited Speakers |
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