Study On The Methodology Improvement Of The Numerical Simulation Of The Thickness Of Ice Caps In The Reservoirs Of Cold Regions

According to the numerical simulation of the growth of the thickness of ice caps in thereservoirs of cold regions, the study has improved the representation of the relationship betweenthe temperature of ice surface and air temperature, justified the linear relationship that thetemperature of ice surface is higher than atmospheric temperature, improved the previous heatmodel of ice caps in reservoirs of cold regions. According to the observed data in the Hongqipaoreservoir, Daqing, Heilongjiang Province in2008and2009, we carried out an investigation onnumerical simulation of the growth in the thickness of the ice caps with temperature-relatedpiecewise function instead of the thermal diffusivity of one-dimensional heat transfer equation.This thesis is part of the research findings of the national natural science fundsproject(40806075). The major research findings are shown as follows:1According to the measured data of the air temperature and the surface temperature of icecaps in the reservoirs, the thesis has improved the representations of the relationship between airtemperature and the temperature of ice surface, treats linear equation as the representation of therelationship between air temperature and the temperature of ice surface, has applied theleast-square method to the identification of parameters, and identified the correspondingrelationship between the temperature of ice surface and atmospheric temperature. Then anumerical simulation was conducted of the growth of the thickness of ice caps in the reservoirswith the temperature of ice surface that is achieved after the transformation of air temperature asthe boundary condition.2In the one-dimensional heat transfer equation of traditional heat models of river ice,empirical constants are often employed as coefficient of temperature conductivity. The presentstudy transformed the coefficient of temperature conductivity of empirical constants into thefunctions that rely on temperature change. In addition, a numerical simulation was conducted ofthe developmental change of the thickness of ice caps in the reservoirs and a contrast was madebetween this and the measured data. The findings indicate that the data of the thickness of icecaps gained from the simulation of the coefficient of temperature conductivity that rely ontemperature change correspond with the data of measured thickness of ice caps. Hence a more accurate description of the developmental process of thermodynamics of river ice with theapplication of the coefficient of temperature conductivity that rely on the change of temperature.