The mechanism of energy loss and transition in a flow with submerged vegetation
The mechanism of energy loss and transition in a flow with submerged vegetation
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水下植被流动中的能量损失和转变机制
DOI：
10.1016/j.advwatres.2010.03.006
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发表时间：
2010-06-01
影响因子：
4.7
通讯作者：
Zeng, Y. H.
中科院分区：
文献类型：
--
作者：
Huai, W. X.;Han, J.;Zeng, Y. H.
研究了具有沉水植被的明渠水流中的能量平衡机制。根据速度和雷诺应力的计算结果，计算了从局部水流借用的能量、植被阻力和水流阻力引起的能量消耗以及沿水深的能量转移。进一步分析表明，植被顶部附近截面能量消耗最大，在水槽床或水面处能量消耗逐渐减小直至为零。从植被地区的当地流动中借用的能源无法满足支出；因此，非植被地区多余的借用能源被传输到植被地区。此外，横截面的总能量转变为零；因此，从流动中借用的总能量平衡了整个横截面的能量损失。同时，我们发现植被对流动存在三种影响：植被湍流限制、植被湍流源和植被能量传递，其中植被影响最强。 Crown 版权所有 (C) 2010 由 Elsevier Ltd 出版。保留所有权利。
The mechanism of energy balance in an open-channel flow with submerged vegetation was investigated. The energy borrowed from the local flow, energy spending caused by vegetation drag and flow resistance, and energy transition along the water depth were calculated on the basis of the computational results of velocity and Reynolds stress. Further analysis showed that the energy spending in a cross-section was a maximum around the top of the vegetation, and its value decreased progressively until reaching zero at the flume bed or water surface. The energy borrowed from the local flow in the vegetated region could not provide for spending; therefore, surplus borrowed energy in the non-vegetated region was transmitted to the vegetated region. In addition, the total energy transition in the cross-section was zero; therefore, the total energy borrowed from the flow balanced the energy loss in the whole cross-section. At the same time, we found that there were three effects of vegetation on the flow: turbulence restriction due to vegetation, turbulence source due to vegetation and energy transference due to vegetation, where the second effect was the strongest one. Crown Copyright (C) 2010 Published by Elsevier Ltd. All rights reserved.