山区河流平面二维流场的数值模拟

2-D horizontal numerical modeling of flow in the mountain river

针对山区河流边界地形复杂、水位及流速变化剧烈的特点,用"混合五对角法"建立平面二维数学模型并求解,进行水位和流速的数值模拟。利用嘉陵江重庆金刚碑-朝阳桥河段地形及5个横断面的水位和水深平均流速资料对此模型进行了验证,模型快速、准确地再现了该河段的水位和水深平均流速情况。

Flow regime in the mountain river is characterized by its complex boundary topography, fluctuating water level and rapid flow velocity. A two-dimensional horizontal numerical model, which is solved by the mixed five-diagonal finite difference algorithm, is developed for modeling water level and flow velocity in the mountain river. This model is verified by the topographic and depth-averaged flow velocity data from the Jingangbei-Chaoyangqiao section near Chongqing in the Jialingjiang River. Good agreements are found in comparison with the measured water level and flow velocity.