TY JOUR TI WATER FLOW MOTION LAWS IN RAFT TRAFFIC IN THE CONDITIONS OFPROLONGED NAVIGATION KW timber rafting KW prolonged navigation KW ice roughness KW compressed stream KW flow speed JO Bulletin of KSAU AU Korpachev, V.P. AU Zlobin, A.A. AU Korpachev, I.V. PY 2012 IS PB Krasnoyarsk State Agrarian University