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Geomorphological numerical modelling of woody dams in CAESAR-Lisflood

Wolstenholme, Josh; Skinner, Christopher; Milan, David; Parsons, Daniel

Authors

Christopher Skinner



Abstract

Natural flood management (NFM) promotes the sustainable enhancement of natural fluvial processes to reduce flooding (SEPA, 2015; Wilkinson et al., 2019), and is increasingly popular for use by community groups, contractors and governments (Kay et al., 2019). Reintroduction of wood to a river channel is a popular form of NFM often achieved through seeding natural logjams, or with an emphasis on engineering through installing woody dams (WDs). WDs are currently installed or being installed in catchments in an effort to reduce flood risk, through hydrograph attenuation, increase biodiversity and improve geomorphic heterogeneity (Wenzel et al., 2014; Burgess-Gamble et al., 2017; Grabowski et al., 2019). A further objective is to emulate the effect of natural wood found in river channels by partially, or completely, blocking the channel to accelerate the recruitment of natural wood as part of the natural wood cycle (Addy & Wilkinson, 2016).

There is a growing body of evidence supporting the benefits of NFM, however, the hydrogeomorphic effects of WDs are less well understood (Dadson et al., 2017). There is little scientific underpinning concerning the long-term impact of these features upon hydrogeomorphology at reach and catchment-scales. Very few numerically based studies consider the influence of sediment transport on WDs, and how changes in local bed morphology influence their effectiveness. [continues]

Citation

Wolstenholme, J., Skinner, C., Milan, D., & Parsons, D. (2021, April). Geomorphological numerical modelling of woody dams in CAESAR-Lisflood. Poster presented at EGU General Assembly 2021 (European Geosciences Union), vEGU21: Gather Online

Presentation Conference Type Poster
Conference Name EGU General Assembly 2021 (European Geosciences Union)
Conference Location vEGU21: Gather Online
Start Date Apr 19, 2021
End Date Apr 30, 2021
Deposit Date Apr 29, 2021
Publicly Available Date Apr 30, 2021
DOI https://doi.org/10.5194/egusphere-egu21-9636
Public URL https://hull-repository.worktribe.com/output/3732987
Publisher URL https://www.egu21.eu/