寒区水库淡水冰导温系数的优化辨识

Optimal identification on thermal diffusivity of fresh ice in reservoirs at cold region

为探究接近冰点的天然淡水冰导温系数依赖于温度的非线性变化关系,利用分布参数系统参数辨识方法,建立了以淡水冰导温系数依赖于温度函数的参数辨识模型,数值求解该模型辨识计算出淡水冰导温系数的非线性关系.并用该辨识结果数值模拟了山西太原汾河二库淡水冰温度变化过程,模拟结果表明:辨识得到的水库淡水冰依赖于冰温变化的导温系数关系式是有效的.

In order to investigate the nonlinear relationship between thermal diffusivity of natural freshwater ice and temperature near freezing point, a parameter identification model has been developed using the distributed parameter system identification method in this study. By solving the numerical model, the nonlinear relationship formulas between the temperature and the thermal diffusivity of freshwater ice are obtained. The process of ice temperature change in the Second Reservoir of Fen-River in Taiyuan, Shanxi Province is simulated by applying the identification results obtained. The simulation results demonstrate the effectiveness of the relationship between thermal diffusivity of reservoir fresh ice and the ice temperature.