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\begin{document}

\title{Event-scale flow and sediment generation responses to agricultural land
cover change in lowland UK catchments}



\author[1]{Veronica Escobar-Ruiz}%
\author[2]{Hugh Smith}%
\author[3]{Neil Macdonald}%
\author[4]{Andres Peñuela}%
\affil[1]{University of Reading}%
\affil[2]{Landcare Research New Zealand}%
\affil[3]{University of Liverpool}%
\affil[4]{Universidad de Cordoba}%


\vspace{-1em}



  
  \date{June 18, 2024}


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\begin{abstract}
Agricultural land use can increase runoff and erosion leading to
detrimental downstream impacts. This paper examines the impact of
agricultural land cover change on runoff and sediment generation at
event scales using a model-based approach. SHETRAN, a physically based,
spatially distributed model, was applied in two southwest England
catchments to represent: (a) changes in the land cover (cropland extent
and spatial arrangement), (b) changes in crop type, and (c) use of
riparian buffer strips. A total of 84 simulated events within a 4-year
period were used to quantify flow and sediment generation impacts. We
found past changes in land cover resulted in significant differences in
sediment yield (p \textless{} 0.05). Linear regression showed an
increase in flow and sediment yield proportional to increases in arable
crop area (p \textless{} 0.001). The spatial arrangement of cropped
fields and riparian buffer strips produced no significant differences in
event flow or sediment yield (p \textgreater{} 0.05). However, buffer
strip scenarios compared with the base run showed sediment load
reductions in specific events, up to 20\% and 15\% for woodland and
grass riparian buffers, respectively. When comparing crop types with and
without the use of post-harvest cover crops, we observed non-significant
differences (both Qv and Sy). However, large reductions in modelled
sediment yields occurred for some events (e.g., up to 60\% for winter
cereals, 50\% for maize and 74\% for spring cereals). For these
scenarios, examination of rainfall event magnitude emphasized the
importance of ground cover in mitigating soil erosion for maize and
spring cereals, but not for winter cereals. Our findings indicate that
significant changes in sediment delivery at the event scale are
associated with cropland extent and crop types, depending on rainfall
magnitude, but not on the spatial arrangement of cropped fields or the
use of riparian buffer strips.%
\end{abstract}%



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\textbf{Hosted file}

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\textbf{Hosted file}

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