Leeds FAS2 FSR: environmental challenges for the design of an in-river control structure

Q4 Earth and Planetary Sciences Dams and Reservoirs Pub Date : 2024-05-05 DOI:10.1680/jdare.2024.7
Emily Hale
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Abstract

As flood risk authorities look to counter increasing peak river flows due to a changing climate, traditional linear flood defences are in many cases proving to be an unsustainable method of managing flood risk. Full containment of flows in the river channel will require ever increasing defence heights, cutting off communities from their rivers and natural heritage. Upstream flood storage provides a potential alternative means of flood management, allowing the peak of the flood to attenuate and downstream river levels to be kept within a tolerable range. The Leeds Flood Alleviation Scheme Phase 2 (FAS2) uses a combined approach: linear defences are constructed in urban reaches and complemented by an online flood storage reservoir (FSR) upstream of the city. The FSR halves the annual probability of defences overtopping within the city centre from 1% to 0.5%, achieved through active variable flow control at the FSR. This paper explores some of the challenges faced in the design and construction the in-river flow control structure which is integral to the operation of the FSR. In particular this paper will consider some of the key environmental objectives for the scheme and offer considerations for working in a dynamic and environmentally sensitive fluvial environment.
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利兹 FAS2 FSR:设计河内控制结构面临的环境挑战
由于气候不断变化,洪水风险管理机构希望应对不断增加的河流峰值流量,在许多情况下,传统的线性防洪堤被证明是一种不可持续的洪水风险管理手段。要完全控制河道中的水流,需要不断增加防御高度,从而切断社区与河流和自然遗产的联系。上游洪水存储为洪水管理提供了一种潜在的替代方法,可使洪峰减弱,下游河水水位保持在可承受的范围内。利兹洪水缓解计划第二阶段 (FAS2) 采用了一种综合方法:在城市河段修建线性防御设施,并在城市上游修建一个在线蓄洪水库 (FSR),作为补充。该蓄洪库通过在蓄洪库进行积极的可变流量控制,将市中心内防洪堤每年被冲垮的概率减半,从 1% 降至 0.5%。本文将探讨在设计和建造与 FSR 运行密不可分的河内流量控制结构时所面临的一些挑战。本文将特别考虑该计划的一些关键环境目标,并提供在动态和环境敏感的河道环境中工作的注意事项。
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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来源期刊
Dams and Reservoirs
Dams and Reservoirs Earth and Planetary Sciences-Geotechnical Engineering and Engineering Geology
CiteScore
0.50
自引率
0.00%
发文量
30
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