中文摘要：

通过对大型渡槽的温度边界条件进行分析计算，确定了影响渡槽温度边界条件的主要影响因素及其变化规律。对温度场计算中的材料热参数进行了分析讨论，提出了参数值的确定方法。以南水北调中线某大型渡槽工程为研究对象，建立了矩形槽身结构沿壁厚、墙高、槽宽等方向的温度梯度模式。研究成果正在南水北调中线大型渡槽工程设计中应用。

英文摘要：

Main factors and variation laws of temperature boundary conditions of large-scale aqueducts are determined by analyzing and calculating the temperature boundary conditions. The determination methods of heat parameters of materials are also given. By calculating the temperature fields of some large-scale aqueducts in the Middle Route of the South-to-North Water Transfer Project, the temperature-gradient models of rectangular flume are established in the direction of thickness, height and width. The results are being applied in the Middle Route of the South-to-North Water Transfer Project.