Modelling the effectiveness of land-based natural flood management in a large, permeable catchment

Collins, Sarah, Verhoef, Anne, Mansour, Majdi, Jackson, Christopher R, Short, Christopher J ORCID: 0000-0003-0429-1143 and Macdonald, David M.J. ORCID: 0000-0003-3475-636X (2023) Modelling the effectiveness of land-based natural flood management in a large, permeable catchment. Journal of Flood Risk Management, 16 (2). e12896. doi:10.1111/jfr3.12896

12505 Collins, Verhoef, Mansour, Jackson, Short, Macdonald (2023) Modelling the effectiveness of land-based natural flood management in a large, permeable catchment.pdf - Published Version
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In the United Kingdom, woodland planting and soil and crop management are being promoted as approaches to tackling flooding. Although evidence is limited, it is thought tree planting and regenerative agriculture practices such as crop–herbal ley pasture rotations increase infiltration, soil water storage and evapotranspiration, potentially reducing flooding. A process-based soil–water–vegetation model was coupled with a semi-distributed groundwater model to explore the impact of these interventions on peak and low flows in a large, groundwater-dominated catchment. Land use change and management were found to have limited potential to reduce flooding in this setting. Herbal ley–crop rotations produced a <1% reduction in flow for return periods >2 years, and levels of woodland planting judged to be the realistic maximum produced reductions of 0.2%–2.6%, depending on tree species. Broadscale spruce planting was the only scenario to produce significant reductions in peak flow (16.0%–24.7% at return periods 1–15 years); however, the level of spruce planting required to achieve these reductions was estimated to reduce Q95 flow by ~39%, which would likely have negative implications for water security and ecological river flows. The impact of land-based natural flood management interventions for flood prevention in large, permeable catchments should not be overstated.

Item Type: Article
Article Type: Article
Uncontrolled Keywords: Flood mitigation; Groundwater; Land use; Nature-based solutions
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Q Science > QE Geology
S Agriculture > S Agriculture (General) > S589.75 Agriculture and the environment
S Agriculture > SD Forestry
Divisions: Schools and Research Institutes > Countryside and Community Research Institute
Research Priority Areas: Place, Environment and Community
Depositing User: Bee Ray-Smallcalder
Date Deposited: 21 Mar 2023 09:32
Last Modified: 25 Sep 2023 11:10

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