坡向 坡度对渠床基土冻结的影响

Effects of Slope Direction and Degree on The Freezing of Canal Bedsoil

本文从分析气候因素着手，论述了任意坡向、坡度面的日出、日没时角、坡面太阳辐射系数（Ｋｔ）、太阳辐射地温增值（△Ｔ）、日照遮荫系数（Ｋｚ）的计算方法，找出了渠床基土各部位的冻结规律，建立了任意坡向坡度面负温指数和坡面日照遮荫系数的计算模式，为渠床各部位的冻深计算提供依据。

Starting with the analysis of climatic factors,this paper discusses some methods for calculating sunrising hour angle and sunsetting hour angle of a slope with arbitrary direction and gradient,slope solar radiation coefficient(K t),ground temperature increment caused by solar radiation (△T)and sunshading coefficient (K z).The freezing pattern of canal bedsoil at differnt positions is put forward and the models for calculating minus temperature index of a slope with arbitrary direction and gradient and for slope sunshading coefficient are set up herein.These results provide bases for calculating the frozen depth of a canal bed at different positions.