反演梯形渠道砼衬砌体表面温度的太阳辐射模型

Solar Radiation Model for the Back Analysis of Surface Temperature of Concrete Lining of Trapezoidal Canal

根据渠道不同部位衬砌体表面接受太阳辐射量不同、温度不同的基本规律,利用太阳辐射量之间相互平衡的关系,建立了通过太阳净辐射反演渠道衬砌体表面温度的一种简单实用的太阳辐射模型。利用MATLAB编程计算出了考虑遮蔽情况下渠道不同部位的大气温度T0及衬砌板温度TS随时间t变化的曲线,比较了各个部位混凝土温升与大气温升的关系。计算实例表明,模型不仅符合实际中的规律,而且为以后的渠道表面衬砌体温度反演提供了一种简单可行的方法。

The lining surface of different parts of canal accepts different solar radiation and has different tempera-ture. In line with the balanced relationship between the amount of solar radiation and net solar radiation, a simple and practical solar radiation model was established for the back analysis of canal lining＇ s surface temperature. By using MATLAB programming, the atmospheric temperature TO at different parts of the canal and the variation of ling temperature Ts with time t was calculated taking shaded parts into consideration. The relation between concrete tem-perature rise at different parts and atmospheric temperature rise were compared. Calculation example revealed that： the variation of atmospheric temperature TO and the lining plate temperature Ts respectively at canal bottom, shaded slope and sunny slope were in consistency ; with the rise of atmospheric temperature, the lining surface temperature increased rapidly and exceeded the atmospheric temperature and reached the maximum. But the range of tempera-ture change varied significantly ： sunny slope presents a widest range of temperature rise, followed by canal bottom and shaded slope. The maximum temperature of lining surface came later than that of atmospheric temperature. This model not only conforms with reality and provides a simple and feasible method for the back analysis of lining surface temperature.