Yugra Scientific Research Institute of Information Technologies, together with Yugra State University, Computing Mathematics Institute of the Russian Academy of Sciences, Water and Ecological Problems Institute of the Russian Academy of Sciences and a number of other organizations, realizes the scientific and technical project: «Development and use of information-modelling systems of hydrodynamics, chemical and biological characteristics of water objects in view of anthropogenous loads and hydraulic engineering constructions to solve the challenges of water use, water and biological resources protection, ecological and hydraulic engineering projection and examination». The project target is creation and practical use of modern simulation information-modelling systems (IMS) of water objects (river, water basin, estuaries) hydrological and ecological monitoring, water with high risk of the dangerous hydrological phenomena and processes, with high concentration of polluting substances and essential imbalance of water ecosystem bioefficiency, and the objects including complex hydraulic engineering constructions as well.
Problems of use of difficult computer models of high spatial and temporal solution to estimate (diagnosis and forecast) dynamics of hydrological variables (speed of flow and water levels), temperature and ice modes of river systems are discussed in the submitted report. The concrete object of use of basic modelling complex (BMC) YSRIIT, which nucleus is 2,5-D model of hydrodynamics and water quality CE-QUAL-W2 version 3.2, is the site of a middle watercourse of Severnaya Sosva river, which is the large left inflow of the Nizhnaya Ob river. There is discussion of problems and results of creation of ecosystem databases necessary for use of the model (bathymetry, hydrology, meteorology, characteristics of water quality). The results of creation 3-D model to bed channel and a coastal zone of the specified site of the river with applying software package ArcGIS and results of calculation of estimated grid model construction for BMC are submitted.
Results of speeds of flow and water levels numerical modelling, including the periods of a spring-and-summer high water and an autumn flood, temperature and characteristics of the ice cover, received by the BMC in different variants of grid solution are discussed in detail. There is making a comparison between results of modelling at the high grid solution (thickness of a water layer is 0,2- 0,4 m , at a lowest water level depth is up to 11 m , length of longitudinal segments is 400 m , at length of a modelled sector of the river is 70,8 km ) and the data of hydrological supervision from hydroposts on entrance and closing ranges from January, 01 till December, 31, 2003. There are presented qualitative and quantitative characteristics of the given comparison and prospects of works on creation IMS for northern.
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