General/hydrology/en
Background
KalypsoHydrology is a module for Rainfall-runoff Modelling (RRM-modelling), in which a precipitation load is used to simulate the full, land-based part of the global water balance. Here, the sub-processes such as: Snow storage, Evapotranspiration, Soil water storage, Groundwater recharge, Surface runoff, Interflow, Groundwater runoff and Flood routing are taken into account in the channel of the water cycle.
KalypsoHydrology is developed at the Institute of River and Coastal Engineering and Björnsen consulting engineers gmbh (BCE). It is based on the computation code Kalypso-NA. Kalypso- NA is a conceptual, deterministic, non-linear, detailed hydrological model that implements several model concepts.
The field of application of the RRM can be seen both in the process analysis, the prediction of planning conditions (such as renaturation and integration of spillways) and in the flood forecast in operational use (protection against flooding by the water level forecast).
The model concept (see figure The Model concept) is based on the simulation of the different hydrological sub-processes as linear storage elements, which are coupled via water flows together into a cascade of storage elements. The process of runoff is assumed to be one-dimensional vertical and simulated on Hydrotope level. Hydrotopes are surfaces with a uniform hydrological characteristics, which are formed on the basis of land use, pedology, geology and sub-basins. To describe the runoff concentration, the resulting runoff volumes are aggregated at sub regional level and collected considering the characteristic flow times after translation and retention as part of field drainage and associated with a water strand in the river network. These processes are assumed to be lateral one-dimensional. The outflow deformation in the channel is carried out according to the procedure of Kalinin - Miljukov.
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