2D HYDRODYNAMIC MODELLING FOR IDENTIFICATION OF DEWATERED OR FLOODED STREAM CHANNEL AREAS DOWNSTREAM LARGE HYDROPOWER PLANT

Journal of Water Security Pub Date : 2019-11-06 DOI:10.15544/jws.2019.004

Linas Šilinis, E. Kasiulis, P. Punys

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引用次数: 1

Abstract

Hydropower is oldest available source for renewable energy generation in Lithuania and the world. However, because of unequal demand of electricity during the day large hydropower plants are adapted to work in hydropeaking regime, which causes rapid water level and discharge fluctuations and has impact on the environment. To assess the extent of this impact in this study 2D numerical hydrodynamic modelling was carried out to reveal the dewatered or flooded stream channel areas at the Nemunas River downstream Kaunas Hydropower Plant. Such estimation of dewatered or flooded areas, considering different operating modes of hydropower plant, was carried out for the first time in Lithuania. It was revealed that largest areas are flooded when Kaunas hydropower plant starts its operation with two and four turbines and accordingly are dewatered when the plant stops such operations. During this study the impact of water level and discharge fluctuations on river ecosystems was not analysed, however the obtained results will be the initial data for more detailed assessment of fish habitats quality under impact of hydropeaking.

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大型水电站下游干流或洪泛河道区域识别的二维水动力模拟

水电是立陶宛和世界上最古老的可再生能源发电来源。然而，由于白天电力需求不均衡，大型水电站适应在调峰期运行，造成水位和流量的快速波动，对环境造成影响。为了在本研究中评估这种影响的程度，进行了二维数值水动力学建模，以揭示考纳斯水电站下游Nemunas河的脱水或淹没河道区域。这种考虑水电站不同运行模式的脱水或淹水面积估算在立陶宛尚属首次。据调查，考纳斯水电厂的2台和4台水轮机开始运行时，大部分地区被淹，一旦停止运行，大部分地区缺水。本研究并未分析水位及流量波动对河流生态系统的影响，但所得结果将成为更详细评估水峰影响下鱼类生境质量的初步数据。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Journal of Water Security

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