河床与水体热交换的数值计算

Simulation of Heat Transfer between Streambed and River Flow

在任意一个完整的热力模型中，河床与水体的热交换是一个很重要的热力因素，特别是对于封冻河道，以及水深较浅且温度昼夜变化较大的河道．本文提出了数值求解非稳态导热微分方程的数值模型，并与量测资料进行比较，结果表明数值模型能准确地模拟水体与河床的热交换．

Conductive heat exchange between streambed and the water contacted is a significant heat bal-ance component in a full thermal budget model, especially in ice-covered rivers or shallow streams. A numerical model based upon a finite difference solution of the unsteady heat dispersion equation is formulated to predict heat conduction between water and streambed with emphasis on its application to the diurnal temperature varia-tions of shallow or ice-covered streams.