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The CHyM, Cetemps Hydrologica Model, is a distributed grid-based hydrological model implementing an explicit parameterization of different physical processes contributing to the hydrological cycle. The model has been implemented by the Hydrological Modeling Group of CETEMPS since 2002.
CHyM is employed, in the project, to provide numerical simulations at high horizontal resolution to reveal the hydrological impact of landfalling AR in several basins of different characteristics, representative of the complex topography of the Italian peninsula. The probability and the timing of flood risk will be investigated. Using CHyM model it is possible to study the response of the basins to different ARs. The model can rebuild the whole drainage network of a considered domain, starting from the Digital Elevation Model, allowing the analysis of the simultaneous response of different basins.
For the case studies, in addition to the simulated flow discharge values, we will also exploit a stress index approach: discharge and runoff are combined with geographical information related to the upstream basin displacement, using other variables, such as the hydraulic radius (a linear function of the drained area) and time of concentration (that implicitly considers runoff conditions upstream). Stress indices provide information in each point of the drainage network, and their mutual variation from upstream to downstream along the river path is proportional. For this reason, general thresholds, valid for all grid points of the drainage network, are defined. Moving from discharge-only to combined discharge-based and runoff-based indices, allows to assess the river stress conditions. The methodologies will identify the relevant features of an AR conducive to high hydrological impact (e.g. intensity/duration) and watershed characteristics critical for turning precipitation into flooding, such as antecedent soil conditions, snow-rain partitioning and snow melting which are still uncharted aspects, very relevant given the complexity of the Italian territory.
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