Large cobblestone dams for natural flood management in wide peatland gullies

IF 3.9 2区环境科学与生态学 Q1 ECOLOGY

Ecological Engineering Pub Date : 2025-06-07 DOI:10.1016/j.ecoleng.2025.107702

Adam Ryan Johnston , David Brown , Tim Allott , Salim Goudarzi , Martin Kay , David Milledge , Emma Shuttleworth , Tom Spencer , Martin Evans

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引用次数: 0

Abstract

Peatland restoration is increasingly used for natural flood management (NFM). In the restoration of heavily degraded blanket peatland sites, erosional gully blocking is used to capture sediment and rewet peat in smaller peat gullies. There is limited prospect for restoration of wider late-stage erosional gullies, however these have potential for large water storage capacities for NFM barriers. A new type of peatland gully block, Large Cobblestone Dams (LCDs), designed to create large temporary in-storm storage volumes are evaluated here. Different modifications to LCD design, including dam-face modification and drainage outlets are tested. Observations of dam pond levels and input discharge are used to evaluate storage functioning. LCDs achieve temporary in-storm storage volumes to the order of 10–100 m³. Bare cobblestones were too permeable, with peat turfed dam faces improving storage utilisation. A drainage outlet is essential for inter-storm drainage to enable storage availability for following storm events. Opening of drainage holes and blocking of the outlet was observed immediately following peat turfing, however this stabilised following 1 year. With an optimised design, LCDs can provide relatively large dynamic storage volumes in peatland gullies which are not restoration priorities which with targeted design could provide NFM benefits to downstream communities.

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在宽阔的泥炭地沟壑中用于自然洪水管理的大型鹅卵石水坝

泥炭地恢复越来越多地用于自然洪水管理（NFM）。在严重退化的地毯式泥炭地遗址恢复中，侵蚀沟阻塞被用于捕获沉积物并在较小的泥炭沟中重新湿化泥炭。恢复较宽的后期侵蚀沟渠的前景有限，然而，这些沟渠有潜力为NFM屏障提供大量的储水能力。一种新型泥炭地沟块，大型鹅卵石坝（lcd），设计用于创建大型临时风暴存储容量在这里进行评估。对LCD设计进行了不同的修改，包括坝面修改和排水口修改。通过对坝池水位和输入流量的观测来评价蓄水功能。lcd实现了10-100立方米的临时风暴存储容量。裸露的鹅卵石渗透性太强，泥炭铺地的大坝表面提高了蓄水利用率。排水口对于暴雨间排水是必不可少的，以便在暴雨发生后能够储存。泥炭浇筑后，立即观察到排水孔的打开和出口的堵塞，但这种情况在1年后稳定下来。通过优化设计，lcd可以在泥炭地沟壑中提供相对较大的动态存储容量，而泥炭地沟壑不是恢复的优先事项，而有针对性的设计可以为下游社区提供NFM效益。

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

Ecological Engineering 环境科学-工程：环境

CiteScore

8.00

自引率

5.30%

发文量

293

审稿时长

57 days

期刊介绍： Ecological engineering has been defined as the design of ecosystems for the mutual benefit of humans and nature. The journal is meant for ecologists who, because of their research interests or occupation, are involved in designing, monitoring, or restoring ecosystems, and can serve as a bridge between ecologists and engineers. Specific topics covered in the journal include: habitat reconstruction; ecotechnology; synthetic ecology; bioengineering; restoration ecology; ecology conservation; ecosystem rehabilitation; stream and river restoration; reclamation ecology; non-renewable resource conservation. Descriptions of specific applications of ecological engineering are acceptable only when situated within context of adding novelty to current research and emphasizing ecosystem restoration. We do not accept purely descriptive reports on ecosystem structures (such as vegetation surveys), purely physical assessment of materials that can be used for ecological restoration, small-model studies carried out in the laboratory or greenhouse with artificial (waste)water or crop studies, or case studies on conventional wastewater treatment and eutrophication that do not offer an ecosystem restoration approach within the paper.