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首页> 外文期刊>International journal of applied mechanics >Characterizing Density Flow Regimes of Three Rivers with Different Physicochemical Properties in a Run-Of-The-River Reservoir
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Characterizing Density Flow Regimes of Three Rivers with Different Physicochemical Properties in a Run-Of-The-River Reservoir

机译：三条河流水库中不同物理化学特性的三条河流的密度流动制度

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摘要

Inflow mixing affects the spatiotemporal heterogeneity of water quality in reservoirs. Reservoir water quality management requires accurate prediction of density flow regimes to understand the spatiotemporal distribution of dissolved and particulate nutrients and organics. This study aims to characterize the mixing and circulation of three rivers with different physicochemical properties in a run-of-the-river (ROR) reservoir, using high-frequency monitoring and three-dimensional (3D) hydrodynamic modeling. The Aquatic Ecosystem Model (AEM3D) was constructed for the reservoir and calibrated with high-frequency data obtained from May-June 2016, accurately reproducing the observed spatiotemporal variations of flow velocity, water temperature, and electrical conductivity (EC) in the reservoir. High-frequency data and 3D model results showed that mixing of the rivers in the ROR reservoir is governed by density flow regimes formed by influent water temperature differences. At the confluence, colder and warmer river influents formed underflows and surface buoyant overflows, respectively. The spatial arrangement of flow direction, water residence time, and EC concentration were largely controlled by the buoyancy-driven flow. Stagnant areas with long residence times corresponded with areas of observed algal blooms and hypoxia. High-frequency sensor technology, combined with 3D hydrodynamic modeling, is effective for understanding the complex flow regimes and associated water quality characteristics in ROR-type reservoirs.
机译：流入混合影响水库中水质的时空异质性。水库水质管理需要准确地预测密度流动制度，以了解溶解和颗粒状营养和有机物的时空分布。本研究旨在使用高频监测和三维（3D）流体动力学建模，在河流（ROR）水库中具有不同物理化学性质的三个河流的混合和循环。水产生态系统模型（AEM3D）被为储层构建，并以从2016年5月至6月获得的高频数据校准，准确地再现了储存器中的流速，水温和电导率（EC）的观察到的时空变化。高频数据和3D模型结果表明，ROR水库中的河流混合由受影响水温差异形成的密度流动制度来控制。在汇合，较冷，更温暖的河流影响分别形成的欠流和表面浮力溢出。流动方向，水停留时间和EC浓度的空间排列主要受到浮力驱动的流动的控制。长期停留时间的停滞区域与观察到的藻类盛开和缺氧的区域相对应。高频传感器技术与3D流体动力学建模相结合，可有效理解复杂的流量制度和ROR型水库中的相关水质特性。

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