ИСТИНА

Climatic features of our country cause the annual floods on rivers, accompanied by inundation of floodplains. Water level rise can reach up to 7-10 m and more above low-water level during this period. For assessment of potential damage and development of flood safeguard methods for settlements various methods of physical and mathematical modeling are used. The two-dimensional hydrodynamic model of overflow channels and inundated floodplain STREAM_2D on the basis of numerical solution of twodimensional Saint-Venant equations on hybrid curvilinear quadrangular and rectangular mesh was used for simulations in our research. An important step in modeling of the flooded territory is the verification of the simulated and field data. An effective method to check the accuracy of the model is the Earth remote sensing use. By means of space images division of not flooded territories from covered with water by means of automatic classification of K-mean method is made. Flooded area, calculated on images and simulation results, was chosen as a parameter of the model calibration. Experimental work has been done on the Northern Dvina, Lena, Tom and Amur Rivers. To estimate simulation results different types of images: radar images (Radarsat-2), images in the near-infrared and visible range (SPOT-5), very high resolution images (EROS-A) were applied. Tested methods have shown good results (relative error did not exceed 15 %). The study was supported by the Russian Science Foundation (grant No. 14-17-00155).