The Prototype Observation And Computational Simulation Of Ice Thickness Under Hydrostatic And Hydrodynamic Conditions

In winter the formative Lakes and Rivers ice-cover is easy to cause a certain impact on the fishery and hydraulic structures,in order to explore the process and regularity of ice-cover growth in The Yellow River,this study selected in Shisifenzi pool of Tuoketuo country in Inner Mongolia and 9 cross sections for example Shisifenzi in Region of The Inner Mongolia Reach of The Yellow River in 2015-2016,by means of prototype measurement,getting the test data such as air temperature,ice thickness.According to the result of the experiment,sums up the process of growth of Hydrostatic ice-cover,and relationship with the air temperature,and based on a unified degree-day method to simulate the growth of hydrostatic ice;In addition,this paper use the growth of hydrostatic ice as auxiliary,combined with the air temperature and kinetic factor to simulated the 9 cross sections for example Shisifenzi in Region of The Inner Mongolia Reach of The Yellow River ice thickness by the modified degree-day method.The following main achievements were obtained:(1)Pool ice was mainly affected by temperature in Initial frozen,change significantly within a day,ice thickness is mainly influenced by accumulated negative temperature during freezing stability period of the ice cover,ice thickness increases linearly.(2)The static water ice cover growing process is simulated by degree-day method and Zubov model,the results show that the modified degree-day formula than the empirical degree-day formula,the ideal formula is more close to actually measured value;The Zubov semi-rational formula is superior to the modified degree-day formula,(3)This paper selected 9 cross sections for example Shisifenzi in Region of The Inner Mongolia Reach of The Yellow River,through the observation indicated that in the ice run period,ice run density increases with the decrease temperature until freeze-up;in the freeze-up period,water-level fluctuation changes smoothly.(4)Based on degree-day theory,the modified equations of air temperature and velocity for ice thickness were established.According to the known temperature of the site,through the distance square inverse ratio method,interpolation the temperature change of the rest of the site;according to the mean daily discharge,the cross section topography,mean daily stage,mean velocity in section is calculated;using the measured values of Toudaoguai,the coefficients in the formula are obtained by data fitting.The result shows that the fitting result of the modified formula is consistent with the measured value.Finally,the relationship between the ice thickness growth process and the accumulated negative temperature of each station in Region of The Inner Mongolia Reach of The Yellow River is simulated by this formula.