Transition mode of the middle route of South-to-North Water Transfer Project before freezing

The main canal of the middle route of South-to-North Water Transfer Project crosses four drainage areas and eight latitudes from south to north, almost across half of China in a north-south direction, and most part of the main canal is in the north of the Yellow River. Different degree of Ice freezing will occur from the north to the south in winter, and may cause disasters such as ice jamming and ice dam. Therefore, proper operation and control of canals is needed in the freezing period. This paper tries to test a transition mode from usual full capacity state to a low flow ice-forming state (flow velocity less than 0.4m/s) within 3 days´ cold current forecast in advance. In this paper, a simulation is performed at the MATLAB platform using this control model applied in the Middle Route of South-to-North Water Transfer Project in China, and the simulation results show that the transition model can achieve the desired goals.