Ice Monitoring And Study On The Ice Capacity Of Channel Based On The Ice-Water Two-Phase Flow

Xinjiang is located in the high latitude of northwest China,where is drought,rainless and short of water resources.water usage problem is outstanding,especially in winter.With the adjustment of the industrial structure and the proportion of industrial water consumption increased,the result of stopping running hydropower in winter is more and more seriously giving rise to power shortage and restricted economic development.Stop water delivery in glacial epoch has seriously effects,which could restrict the local lives and development.So it is necessary to carry out water delivery in winter to relesase water shortage and electronic power problems.But there are some special channels in the cold region of northern China,which is not considering the influence of ice cover choke and ice loading of the channel forms and structures,so it doesn't have condition on flowing with ice load to finish the task of power generation.these channels are almost wide-shallow type,the frost resistance is poor,channels are suscepected to damage on ice load of small velocity and low depth in frozen time,while forming the ice load,channel bed is easily to be filled with ice,which could forfeit the water capacity,so these channels must run without ice load.In order to ensure the safety of water delivery and power generation.preventing ice disasters during the winter,guarantee the safety water delivery of the channel,this paper using a diversion channel which is located in northern Xinjiang as an example,carry out the research of following three aspects:(1)Taking the channel monitoring images as example,conduct binaryzation to the monitoring image by Matlab,calculate the best threshold value,so as to accuracy extract ice information,and then calculate the density of ice,implement the density quantitative monitoring of ice.and optimized the algorithm in the calculation process.found that the error is only 8.15% through compared this algorithm results with the real ice density.significantly improve precision.It has certain significant to the ice monitoring of channel in winter.(2)Carry out physical model experiment to simulate the ice capacity of the narrow pier section.in condition of invariable pier spacing,by controlling the hydraulic elements,the size of ice and quantity of ice to simulate the ice capacity.Get the flow laws of different size of ice,utilize the dimensional analysis,sum up the ice capacity empirical formula,it is mean to safety water delivery of channel in winter.(3)Simulating the water temperature along the channel by Fluent,by controlling the hydraulic elements and meteorological elements,get the transformation law of the water temperature along the channel.so as to determine the initial position of ice.Finally compared simulation result with the real monitoring data and calculation by one dimensional thermal diffusion equation.Found that the error is no more than 0.2K,could reflect water temperature change process of channel.provide the theory basis for the safe operation of channel in winter.