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Unravelling the impacts of extreme wet weather on hydro-sedimentological responses using suspended sediment flux monitoring and biotracer sediment source fingerprinting

Authors

Upadhayay,  Hari Ram
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Zhang,  Yusheng
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Granger,  Steven J.
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Collins,  Adrian L.
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Upadhayay, H. R., Zhang, Y., Granger, S. J., Collins, A. L. (2023): Unravelling the impacts of extreme wet weather on hydro-sedimentological responses using suspended sediment flux monitoring and biotracer sediment source fingerprinting, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-2597


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5019298
Abstract
Catchment scale hydro-sedimentological data allows unprecedented opportunities for assessing water quality and sediment source information which can inform management decisions and policy. Intensification of agricultural soil management is closely linked to increased delivery of sediment to aquatic systems, yet the severity of hydrological forcing on soil erosion and sediment delivery requires further attention in the context of understanding landscape resilience to climate change. Here, we collected high-resolution discharge, turbidity and sediment biotracer data in a low-density grazing catchment- the Upper Taw River observatory (UTRO; ~42km2) in Southwest England, for 3 years (October 2018- September 2021) to understand the spatiotemporal variation of sediment source contributions to monitored suspended sediment fluxes. Sediment loads were highly responsive to extreme weather and exhibited substantial elevation during the wettest winter (2019-20) which was the 5th wettest on record for the UK. Sediment source contributions estimated using biotracers and unmixing modelling indicated that the tributary draining the most arable land dominated source contributions to the monitored catchment suspended sediment loads. Our analysis demonstrates that hydrological forcing can override agricultural soil best management under business-as-usual.