Lateral subsurface flow is only considered in the saturated part of the profile. Within each square the soil profile is described in a number of nodes, which above the groundwater table may become partly saturated. The river system is assumed to run along the boundaries of these. In the horizontal plane the catchment is discretized in a network of grid squares. The flow equations are solved numerically using finite difference methods. The model is completed by a description of the processes of snow melt, interception and evapotranspiration. MIKE SHE solves the partial differential equations for the processes of overland and channel flow, unsaturated and saturated subsurface flow. A description of MIKE SHE is given in (Ref. DHI's version of the SHE, known as the MIKE SHE, represents significant new developments with respect to user interface, computational efficiency and process descriptions. Since 1987 the SHE has been further developed independently by the three respective organizations which now are University of Newcastle (UK), Laboratoire d'Hydraulique de France and DHI. It is a deterministic, fully-distributed and physically- based modelling system for describing the major flow processes of the entire land phase of the hydrological cycle. The European Hydrological System - SHE was developed in a joint effort by Institute of Hydrology (UK), SOGREAH (France) and Danish Hydraulic Institute. The technical approach of the project as well as the DLIS in particular are described in (Ref 1). The DLIS has been developed to meet these requirements. Such a multidisciplinary project involves large amounts of different data to be used for model setup, calibration and validation, which together with the requirements in terms of presentation and interpretation of results, calls for efficient GIS functions. The Gabcikovo hydropower scheme causes the most important of the man-induced impacts, and the immediate project objective is to develop an integrated modelling system that can be used as the technical/scientific basis for future management decisions. Within this area, the Gabcikovo hydropower scheme was finalised in October 1992, and the related reservoir and various hydraulic structures have major impacts on the hydrological regime and the ecosystem in the region. The model area comprises about 3,500 km2 of the Danubian Lowland between Bratislava and Komarno. The scientific basis of the project is provided by an integration of DHI's modelling systems MIKE11, MIKE21 and MIKE SHE, the core of which is MIKE SHE. Agricultural Production and Nitrate Leaching, and Water Quality and Sediment Transport in Rivers and Reservoirs
Ground Water Flow and Ground Water Chemistry The project is sponsored under the EU PHARE programme and focuses on a variety of environmental issues related to: The DLIS has been established as part of the project "Danubian Lowland - Ground Water Model", which is undertaken by a Danish-Dutch consortium comprising six organisations headed by DHI. The DLIS is one of the tools which are being used by Slovak, Dutch and Danish scientist in their investigations of the complex environmental problems of the Danubian Lowland located between Bratislava and Komarno in the Slovak Republic. The Danubian Lowland Information System (DLIS) is an information system based on and integration of ArcInfo GIS with INFORMIX database and DHI's mathematical modelling systems MIKE SHE, MIKE11 and MIKE 21. Henrik Refstrup Soerensen, Boerge Storm, Danish Hydraulic Instituteįrank Deckers, Frank Wardenburg, TNO Hydrological Information Management for the Danubian Lowland, Integration of ArcInfo and MIKE SHE Hydrological Information Management for the Danubian Lowland, Integration of ArcInfo and MIKE SHE
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