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Lookup NU author(s): Dr David MilledgeORCiD
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
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.
Author(s): Johnston AR, Brown D, Allott T, Goudarzi S, Kay M, Milledge D, Shuttleworth E, Spencer T, Evans M
Publication type: Article
Publication status: Published
Journal: Ecological Engineering
Year: 2025
Volume: 219
Print publication date: 01/09/2025
Online publication date: 07/06/2025
Acceptance date: 04/06/2025
Date deposited: 29/01/2026
ISSN (print): 0925-8574
ISSN (electronic): 1872-6992
Publisher: Science Direct
URL: https://doi.org/10.1016/j.ecoleng.2025.107702
DOI: 10.1016/j.ecoleng.2025.107702
Data Access Statement: Data will be made available on request.
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