Seismic assessment of sediment siltation in a tropical run-of-river hydroelectric reservoir

Q2 Environmental Science Environmental Challenges Pub Date : 2024-08-01 DOI:10.1016/j.envc.2024.100996
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Abstract

The Madeira River presents higher sediment flux in relation to others Amazonian rivers, contributing approximately 45 % of the sediment load to the entire Amazon Basin, that is also the region with the largest untapped hydroelectric potential. The implementation of Jirau and Santo Antonio Dams on Madeira River in Brazil created large run-of-the-river hydroelectric complex, and assessment of silting became an important issue to estimate the actual impact on sediment connectivity and on operation of the reservoir. This paper presents data of the morphology and stratigraphy of a portion of Jirau Reservoir, between the Jirau Rapids and the levees close to the Jirau Dam, in the period of February 8th to February 15th, 2022. The data were obtained by Multibeam Echo Sounder and High-Resolution Seismic Reflection. The results obtained by analysing reservoir bed morphology helped identify regions prone to siltation. The run-of-the-river Jirau Reservoir seems to have had minimal sediment retention since start of operations, as observed in seismic profiles. The suspended sediment concentration map of the study area collected for the year 2021, obtained within a parallel study based on satellite images, showed that the distribution on the surface of the reservoir correlates with the geophysical results, supporting our findings and suggesting the need for joint utilization of geophysical and remote sensing techniques.

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热带径流式水电站水库泥沙淤积的地震评估
与其他亚马逊河相比,马德拉河的沉积物流量较大,约占整个亚马逊流域沉积物负荷的 45%,也是水力发电潜力最大的未开发地区。巴西马德拉河上的 Jirau 大坝和 Santo Antonio 大坝建成后,形成了大型的径流式水电综合体,而淤积评估则成为估算沉积物连通性和水库运行实际影响的重要问题。本文介绍了 2022 年 2 月 8 日至 2 月 15 日期间吉劳水库部分地区的形态和地层数据,这些地区位于吉劳激流和靠近吉劳大坝的堤坝之间。数据由多波束回声测深仪和高分辨率地震反射仪获得。通过分析库床形态获得的结果有助于确定易发生淤积的区域。从地震剖面图上观察到,吉劳水库自开始运营以来,泥沙淤积似乎很少。在一项基于卫星图像的平行研究中获得的 2021 年研究区域悬浮泥沙浓度图显示,水库表面的分布与地球物理结果相关,这支持了我们的研究结果,并表明有必要联合利用地球物理和遥感技术。
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来源期刊
Environmental Challenges
Environmental Challenges Environmental Science-Environmental Engineering
CiteScore
8.00
自引率
0.00%
发文量
249
审稿时长
8 weeks
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