CLASSIFICATION OF THE SEVERNAYA DVINA RIVER AND THE VYCHEGDA RIVER CHANNEL SECTIONS ACCORDING TO COMPLEXITY OF CHANNEL PROCESSES AND THEIR MANAGEMENT CONDITIONS by Nadezhda M. Mikhailova, Roman S. Chalov

“…The complexity of the control conditions for channel processes is examined by the case of the Severnaya Dvina River and its main tributary the Vychegda River, which are both the most important waterways of the European North of Russia. …”