Towards integrated flood inundation modelling in groundwater-dominated catchments

Collins, Sarah L.; Christelis, Vasileios; Jackson, C. R.; Mansour, Majdi; Macdonald, David; Barkwith, Andrew

doi:10.1016/j.jhydrol.2020.125755

Cited by 8 publications

(6 citation statements)

References 73 publications

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“…In order to improve the performance of the model in catchments underlain by Chalk, SWAT would need to be coupled with a regional groundwater flow model. Although groundwater flow models of Chalk aquifers—including of the Pang (Jackson et al, 2011)—work well at a coarser temporal resolution as water resources models, modelling flood peaks on a daily time step is more challenging (Collins et al, 2020). In part, this is due to the complexity of interactions between matrix and fractures that govern flow through the Chalk unsaturated zone (Collins et al, 2020; Ireson et al, 2009; Jackson et al, 2006a; Rahman & Rosolem, 2017).…”

Section: Discussionmentioning

confidence: 99%

“…Although groundwater flow models of Chalk aquifers—including of the Pang (Jackson et al, 2011)—work well at a coarser temporal resolution as water resources models, modelling flood peaks on a daily time step is more challenging (Collins et al, 2020). In part, this is due to the complexity of interactions between matrix and fractures that govern flow through the Chalk unsaturated zone (Collins et al, 2020; Ireson et al, 2009; Jackson et al, 2006a; Rahman & Rosolem, 2017). These authors proposed different methods to improve water flow simulation in the unsaturated zone of Chalk including a decoupled soil layer approach (Mathias et al, 2006), a coupled discrete soil layer approach (Brouyère, 2006), and a multi‐layered approach which represents both soil and weathered chalk (Ireson et al, 2009) with the application of the dual porosity Richards equation to groundwater flow through the matrix.…”

Section: Discussionmentioning

confidence: 99%

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Can hydrological models assess the impact of natural flood management in groundwater‐dominated catchments?

Badjana

Cloke

Verhoef

et al. 2023

J Flood Risk Management

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Natural flood management (NFM) is widely promoted for managing flood risks but the effectiveness of different types of NFM schemes at medium (100–1000 km2) and large scales (>1000 km2) remains widely unknown. This study demonstrates the importance of fully understanding the impact of model structure, calibration and uncertainty techniques on the results before the NFM assessment is undertaken. Land‐based NFM assessment is undertaken in two medium‐scale lowland catchments within the Thames River basin (UK) with a modelling approach that uses the Soil and Water Assessment Tool (SWAT) model within an uncertainty framework. The model performed poorly in groundwater‐dominated areas (P‐factor <0.5 and R‐factor >0.6). The model performed better in areas dominated by surface and interflow processes (P‐factor >0.5 and R‐factor <0.6) and here hypothetical experiments converting land to broadleaf woodland and cropland showed that the model offers good potential for the assessment of NFM effectiveness. However, the reduction of large flood flows greater than 4% in medium‐sized catchments would require afforestation of more than 75% of the area. Whilst hydrological models, and specifically SWAT, can be useful tools in assessing the effectiveness of NFM, these results demonstrate that they cannot be applied in all settings.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Can hydrological models assess the impact of natural flood management in groundwater‐dominated catchments?

Badjana

Cloke

Verhoef

et al. 2023

J Flood Risk Management

View full text Add to dashboard Cite

show abstract

“…In our model, we characterize the subsurface based on a 1:625000 scale geological map developed by BGS. While this map has been developed for use in national scale applications, some previous studies have incorporated more detailed information about the variability of subsurface hydrogeological properties at smaller spatial scales that is borehole to catchment (e.g., Collins et al, 2020; Mackay et al, 2015; Rushton et al, 1989). Incorporating these details may also improve our model results and help to reduce the uncertainty due to subsurface hydrogeological properties.…”

Section: Discussionmentioning

confidence: 99%

“…In addition to the quantification of currently available groundwater resources, a national scale model would enable projection of future groundwater resources, for example, under climate change scenarios (Hughes et al, 2021), and groundwater storage depletion under different abstraction scenarios (Jackson et al, 2016). However, in the United Kingdom, groundwater flow modelling efforts so far have focused on the regional scale (e.g., see the reviews in Collins et al, 2020; Jackson et al, 2016; Shepley et al, 2012). Existing national‐scale hydrological models (Bell et al, 2018; Coxon et al, 2019) focus on surface and near‐surface processes and lack an explicit representation of groundwater flow.…”

Section: Introductionmentioning

confidence: 99%

Simulating spatial variability of groundwater table in England and Wales

Rahman

Pianosi

Woods

2023

Hydrological Processes

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Groundwater is a vital natural resource that affects human life and the environment.Groundwater supplies drinking water, supports irrigation for food production, and helps to sustain flow of water in streams and wetlands during dry periods. Therefore, it is important to assess the variability of groundwater resources and consider it in freshwater management. Numerical modelling is widely used for understanding the variability of groundwater table. However, there is still a lack of large-scale groundwater flow models. For instance, in the United Kingdom, groundwater modelling efforts so far have focused on aquifer to regional scales. A national scale model would aid the quantification of the available groundwater storage and the assessment of the impacts of climate change and anthropogenic activities on this crucial resource. In this study, we evaluate a numerical groundwater flow modelling approach for entire England and Wales. This model operates at 1 km spatial and

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“…Although direct runoff is one of the forms of flooding in permeable catchments (Bradford, 2002), flood events are typically groundwater driven. Flooding is most commonly the result of groundwater-fed fluvial flooding and abnormally high groundwater levels (gwls) away from the perennial river channel that cause inundation of subsurface infrastructure or the discharge of groundwater at surface (Collins et al, 2020;Gotkowitz et al, 2014;Hughes et al, 2011;Macdonald et al, 2008Macdonald et al, , 2012Naughton et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

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

Collins

Verhoef

Mansour

et al. 2023

J Flood Risk Management

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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-watervegetation 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 leycrop 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.

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Towards integrated flood inundation modelling in groundwater-dominated catchments

Cited by 8 publications

References 73 publications

Can hydrological models assess the impact of natural flood management in groundwater‐dominated catchments?

Can hydrological models assess the impact of natural flood management in groundwater‐dominated catchments?

Simulating spatial variability of groundwater table in England and Wales

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

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