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Issue 7, 2014
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Temporal dynamics between cattle in-stream presence and suspended solids in a headwater catchment

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Abstract

Cattle in-stream activity is potentially an important contributor to water pollution from agriculture. Here we present research on the physical movements of cattle within a stream on suspended solid concentrations (SSC). This study used camera surveillance to monitor the in-stream activity of dairy cattle in an unfenced reach over a four-month period. Results were compared against high-resolution SSC data. Over the days that cattle grazed the field, 57.9% of the instances when SSC crossed the 25 mg l−1 Freshwater Fish Directive guideline threshold can be attributed to cattle presence in the stream. Flow was the main driver of total sediments transported over the study period, and no relationship was found between SSC and the absolute number of cattle feet in the water. Hysteresis analysis indicated a ‘first-flush’ of local sediments rapidly mobilised during the non-cattle related SSC events, a result of cattle proximity to channel margins. Results demonstrate a temporal lag between cattle in-stream presence and a critical amount of their contribution to sediment load, and that monitoring only instantaneously with cattle activity may lead to underestimation of their pollution impact.

Graphical abstract: Temporal dynamics between cattle in-stream presence and suspended solids in a headwater catchment

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Article information


Submitted
15 Dec 2013
Accepted
31 Jan 2014
First published
31 Jan 2014

Environ. Sci.: Processes Impacts, 2014,16, 1570-1577
Article type
Paper

Temporal dynamics between cattle in-stream presence and suspended solids in a headwater catchment

J. A. Terry, C. McW.H. Benskin, E. F. Eastoe and P. M. Haygarth, Environ. Sci.: Processes Impacts, 2014, 16, 1570
DOI: 10.1039/C3EM00686G

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