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首页> 外文期刊>Environmental Modeling & Assessment >Numerical Modeling of the Impact of a Pumped-Storage Hydroelectric Power Plant on the Reservoirs' Thermal Stratification Structure: a Case Study in NW Spain
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Numerical Modeling of the Impact of a Pumped-Storage Hydroelectric Power Plant on the Reservoirs' Thermal Stratification Structure: a Case Study in NW Spain

机译：抽水蓄能电站对水库热分层结构影响的数值模拟：以西班牙西北部为例

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摘要

Pumped-storage hydroelectric power plants are generally perceived as an environmentally respectful technology. Nevertheless, the pumping of water from a lower reservoir to an upper impoundment, and the return of that water during power generation, can strongly affect the water quality of the reservoirs. In particular, plant operation can alter their thermal structure, deep water mixing, and water circulation characteristics. The objective of this study is to quantify, through the use of 3D hydrodynamic modeling, the potential impacts of a pumped-storage hydroelectric plant on the thermal stability and mixing of two reservoirs in Galicia, northwest of Spain. To this end, three-dimensional hydrodynamic simulations were conducted using the model Delft3D. Two different coupled models, one for each reservoir, were constructed and subsequently tested for several stratification scenarios, according to measured temperature profiles during the spring and summer season. Several reservoir minimum and maximum operation water levels were also considered. Model simulations demonstrated a high level of mixing in the vicinity of the intake-outlet structures, in particular during startup of the power plant, regardless of the water level in the reservoir. Beyond this area, the results showed a limited overall effect on stratification and mixing in the upper reservoir, owing to the relation between the inflow temperatures and the initial temperature profile of this reservoir. A more significant alteration of the thermal structure is expected in the lower reservoir due to its narrow shape and shallow depth at the structure location, as well as the temperature differences between receiving waters and inflow.
机译：抽水蓄能式水力发电厂通常被认为是一种环保的技术。然而，将水从下部水库抽到上部蓄水库以及在发电过程中将水回流会严重影响水库的水质。尤其是，工厂运营会改变其热结构，深水混合和水循环特性。这项研究的目的是通过使用3D水动力模型来量化西班牙西北部加利西亚的抽水蓄能水力发电厂对两个水库的热稳定性和混合的潜在影响。为此，使用Delft3D模型进行了三维水动力仿真。构建了两个不同的耦合模型，每个储层一个，然后根据春季和夏季测得的温度曲线测试了几种分层方案。还考虑了几个水库的最低和最高运行水位。模型仿真表明，无论水库中的水位如何，进水口结构附近的混合水平很高，尤其是在发电厂启动期间。在该区域以外，由于流入温度与该储层的初始温度曲线之间的关系，结果显示出对上部储层的分层和混合的总体影响有限。由于下部水库的狭窄形状和浅浅的深度，以及在接收水和入水口之间的温差，预计下层水库的热力结构会发生更显着的变化。

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