Modelling groundwater/surface water interaction in a managed riparian chalk valley wetland

House, Andrew; Thompson, J. R.; Sorensen, James; Roberts, Colin; Acreman, M.

doi:10.1002/hyp.10625

Cited by 32 publications

(34 citation statements)

References 71 publications

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“…This Boxford site is a special area of conservation because of the habitat it provides for Desmoulins whorl snail ( Vertigo moulinsiana ) and is also as a site of special scientific interest because of its wetland habitats (Old et al , ). It has been the subject of much recent work aimed at understanding the functioning of the wetland (House et al , 2015a, b) which has included the installation of boreholes (Allen et al , ; Newell et al , ) and geophysical surveys, including electrical resistivity tomography (Chambers et al , ) and ground penetrating radar (Musgrave and Binley, ). Historic maps dating back to the 1880s show a network of predominantly linear conduits, sluices and aqueducts characteristic of a managed water meadow system (Newell et al , ).…”

Section: Background To the River Lambournmentioning

confidence: 99%

Long-term Holocene groundwater fluctuations in a chalk catchment: evidence from Rock-Eval pyrolysis of riparian peats

et al. 2016

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The depositional history of peat dominated wetlands can be used to understand palaeoclimate and paleohydrology, and also constrain the impacts of future climate change. However, in chalkland valleys seasonal water table fluctuations and a high alkalinity have decimated key environment indicators such as pollen and there is a need for alternative investigative techniques. The method of Rock-Eval pyrolysis can track changes in organic matter source and degradation, potentially relating to historic changes in vegetation cover. This was piloted on cores from a groundwater dependent riparian chalk valley wetland combined with radiocarbon dating. The dating showed that the cores represented approximately 4000 years of depositional history. Rock-Eval demonstrated significant changes in the normal alkane composition of the peat indicating shifts of around 500 to 1000 years between terrestrial and more aquatic species, relating to periods of climate wetness. These climatic shifts are broadly consistent with other evidence from ombrotrophic peatland and lacustrine sediments across northwest Europe. However, the connection between climate wetness and groundwater dependent chalkland wetlands is complicated by external anthropogenically-driven factors relating to land-use and vegetation cover changes in the catchment. Nonetheless this study suggests that Rock-Eval pyrolysis is a useful and cost-effective tool that can provide evidence for long-term Holocene groundwater fluctuations.

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Section: Background To the River Lambournmentioning

confidence: 99%

Long-term Holocene groundwater fluctuations in a chalk catchment: evidence from Rock-Eval pyrolysis of riparian peats

et al. 2016

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“…A Manning's roughness coefficient of 0.058 s m À1/3 was applied in the winter, and maximum values of 0.08 s m À1/3 and 0.15 s m À1/3 were applied in June during high-flow and low-flow summers, respectively. These values are within the range of 0.045 to 0.353 m 1/3 s À1 reported for a UK chalk stream by House et al (2015). The growth period was defined as April to September, and Manning's roughness values during this period were interpolated between the winter and summer values, which was guided by macrophyte growth measurements in a UK chalk stream reported by Flynn et al (2002).…”

Section: Mike 11 Model Developmentmentioning

confidence: 92%

“…Following auto‐calibration, the model grid size was reduced to 5 × 5 m, and the calibration was checked and refined manually, with the model performance being assessed statistically using the RMSE, the correlation coefficient ( R ) and the Nash–Sutcliffe efficiency coefficient (Nash and Sutcliffe, ). These key statistics assess different aspects of the model performance (bias, correlation, goodness of fit) and have been widely used in similar studies including those where optimized parameter values from auto‐calibration routines are refined manually (House et al, ; Rochester, ; Thompson, ; Thompson et al, ). The final values of the calibration terms defined at the end of this process are summarized in Table .…”

Section: Methodsmentioning

confidence: 99%

“…These key statistics assess different aspects of the model performance (bias, correlation, goodness of fit) and have been widely used in similar studies including those where optimized parameter values from auto-calibration routines are refined manually (House et al, 2015;Rochester, 2010;Thompson, 2012;Thompson et al, 2013). The final values of the calibration terms defined at the end of this process are summarized in Table I.…”

Section: Model Calibration and Validationmentioning

confidence: 99%

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Coupled Hydrological/Hydraulic Modelling of River Restoration Impacts and Floodplain Hydrodynamics

et al. 2016

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Channelization and embankment of rivers has led to major ecological degradation of aquatic habitats worldwide. River restoration can be used to restore favourable hydrological conditions for target species or processes. However, the effects of river restoration on hydraulic and hydrological processes are complex and are often difficult to determine because of the long-term monitoring required before and after restoration works. Our study is based on rarely available, detailed pre-restoration and post-restoration hydrological data collected from a wet grassland meadow in Norfolk, UK, and provides important insights into the hydrological effects of river restoration. Groundwater hydrology and climate were monitored from 2007 to 2010. Based on our data, we developed coupled hydrological/hydraulic models of pre-embankment and post-embankment conditions using the MIKE-SHE/MIKE 11 system. Simulated groundwater levels compared well with observed groundwater. Removal of the river embankments resulted in widespread floodplain inundation at high river flows (>1.7 m 3 s À1) and frequent localized flooding at the river edge during smaller events (>0.6 m 3 s À1). Subsequently, groundwater levels were higher and subsurface storage was greater. The restoration had a moderate effect on flood peak attenuation and improved free drainage to the river. Our results suggest that embankment removal can increase river-floodplain hydrological connectivity to form a more natural wetland ecotone, driven by frequent localized flood disturbance. This has important implications for the planning and management of river restoration projects that aim to enhance floodwater storage, floodplain species composition and biogeochemical cycling of nutrients.

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“…Potential approaches include using fully-featured models such as Mike-SHE (e.g. (House et al 2015), MODFLOW lake package (Merritt and Konikow 2000) or combining bespoke pond models with groundwater models using dynamic model linking techniques such as OpenMI (Knapen et al 2013).…”

Section: Groundwater Modelling Of Coastal Dune Systemsmentioning

confidence: 99%

Modelling small groundwater systems: experiences from the Braunton Burrows and Ainsdale coastal dune systems, UK

et al. 2017

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Coastal dunes are delicate systems that are under threat from a variety of human and natural influences. Groundwater modelling can provide a better understanding of how these systems operate and can be a useful tool towards the effective management of a coastal dune system, e.g. by identifying strategically important locations for flora and fauna and guiding the planning of management operations through predicting impacts from climatic change, sea level rise and land use management. Most dune systems are small, typically of the size 10-100 km 2 , compared with inland groundwater systems. Applying conventional groundwater modelling approaches to these small systems presents a number of challenges due to the local scale of the system and the fact that the system boundaries (sea, drains, ponds etc.) are close to the main body of the aquifer. In this paper, two case studies will be presented using different modelling approaches to understand the groundwater balance in two dune systems in the UK. The studies demonstrate that, although conventional hydraulic models can describe the general system behaviour, a fuller understanding of the recharge mechanisms and system boundaries is needed to represent adequately system dynamics of small groundwater systems.

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Modelling groundwater/surface water interaction in a managed riparian chalk valley wetland

Cited by 32 publications

References 71 publications

Long-term Holocene groundwater fluctuations in a chalk catchment: evidence from Rock-Eval pyrolysis of riparian peats

Long-term Holocene groundwater fluctuations in a chalk catchment: evidence from Rock-Eval pyrolysis of riparian peats

Coupled Hydrological/Hydraulic Modelling of River Restoration Impacts and Floodplain Hydrodynamics

Modelling small groundwater systems: experiences from the Braunton Burrows and Ainsdale coastal dune systems, UK

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