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高纬度地区的长距离输水渠系在冬季输水时,冰封初期渠道内水内冰、浮冰和冰盖容易引起冰塞、冰坝等灾害,严重影响渠道输水稳定和工程安全,冰害防治是渠道冬季输水的关键技术.在渠道正常明渠大流量输水状态情况下,根据提前3d寒流预报,通过自动控制手段使全线渠内水流流速降到0.4m/s以下,以便形成稳定冰盖,达到平封状态并过渡到冰期运行模式.采用控制与仿真模型,结合南水北调中线干渠的设计数据,在MATLAB平台上进行仿真计算,仿真结果表明可以在目标时间内完成状态过渡.
When the long-distance waterway system in high latitudes transports water in winter, the ice, ice floes and ice caps in the initial ice-free channels will easily cause ice plugging, ice dam and other disasters, which will seriously affect the channel water stability and project safety. Ice Prevention and control is the key technology of water conveyance in winter.Under the condition of large flow in normal open channel, according to the forecast of cold spell in advance 3d, the flow velocity in the whole canal can be reduced to below 0.4m / s by means of automatic control so as to form a stable Ice sheet to reach the flat seal state and transition to the ice period mode of operation.Using the control and simulation model, combined with the design data of the midline of South-to-North Water Diversion Project, simulation was carried out on the MATLAB platform, the simulation results show that the state transition can be completed within the target time.