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

Terry, Julie and Benskin, Clare and Eastoe, Emma and Haygarth, Philip (2014) Temporal dynamics between cattle in-stream presence and suspended solids in a headwater catchment. Environmental Science: Processes and Impacts, 16 (7). pp. 1570-1577. ISSN 2050-7887

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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 l1 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.

Item Type:
Journal Article
Journal or Publication Title:
Environmental Science: Processes and Impacts
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/2300/2308
Subjects:
ID Code:
69733
Deposited By:
Deposited On:
27 Jun 2014 10:46
Refereed?:
Yes
Published?:
Published
Last Modified:
08 Jul 2020 04:13