Ecological Systems and Devices Annotation << Back Formation the trace of radioactive contamination in case of the change of underlying surface roughness Elokhin A.P., Holodov E.A., Zhilina M.V We study how the change of roughness level of underlying surface characterized by parameter z0 influences speed formation of air current going above this surface. It’s shown that the change of this parameter in two times (z0=0,02 instead of z0 = 0,01) leads to air current speed disturbance which dumps both throughout the height and the distance. Maximal disturbance at the level of 5 m may come to 30 %, but at the height of 40 m it comes to 3…5 % and it disappears at the height of 100 m. This disturbance may extend across at the distance of about 1,5…2 km. Estimated values of radioactive contamination of underlying surface in condition of radiation accident at radiation hazardous facility have shown that the indicated disturbance may lead to inaccuracy of radiation contamination area not less than two times more. Phone: (495) 264-06-81