Simulation of Unsteady Flow in Irrigation Canals with Dry Bed
Simulation of Unsteady Flow in Irrigation Canals with Dry Bed
复制标题
干床灌溉渠道非定常流模拟
DOI：
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发表时间：
1993
期刊：
影响因子：
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通讯作者：
F. Holly
中科院分区：
文献类型：
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作者：
E. Meselhe;F. Holly
灌溉系统中的水损失是干旱国家的一个主要问题。这些损失主要是由于灌溉系统效率低下和供水不受控制。因此，改善灌溉管理系统对于保护可用水是必要的。数值建模似乎是解决这一问题的重要辅助手段，因为它已被证明是设计和模拟灌溉网络流量的优秀工具。然而，浅埋和干床的情况下，这是经常在灌溉渠道，计算水力学中的经典问题，往往会导致计算困难。大量的数值实验，支持的控制方程的特性行为的分析，导致了新的方法的发展，以避免消失的小深度在运河中的奇异性。这种新的方法是基于抑制惯性项的方程时，小深度出现迫在眉睫。
Water losses in irrigation systems are a major problem in arid countries. The losses are primarily due to inefficient irrigation systems and uncontrolled water delivery. Improving the irrigation‐management systems is therefore necessary to conserve the available water. Numerical modeling appears as an important aid in solving this problem because it has been proven to be an excellent tool for designing and simulating flows in irrigation networks. However, shallow‐depth and dry‐bed situations, which are frequently encounted in irrigation canals, are classical problems in computational hydraulics, often causing computational difficulties. Extensive numerical experimentation, supported by analysis of the characteristic behavior of the governing equations, has led to development of new approach for avoiding the singularities of vanishingly small depths in canals. This new approach is based on suppression of the inertial terms in the equations when small depths appear imminent.