Predicting critical source areas of sediment in headwater catchments

Thompson, Joshua; Cassidy, Rachel; Doody, Donnacha G.; Flynn, Raymond

doi:10.1016/j.agee.2013.07.010

Cited by 32 publications

(15 citation statements)

References 70 publications

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“…This is a surprising result as many studies have identified intensive arable agriculture as a more prominent land use in P transfers linked to sediment loss (e.g. Thompson et al ., ), and export coefficient models are usually weighted accordingly.…”

Section: Discussionmentioning

confidence: 99%

Flow paths and phosphorus transfer pathways in two agricultural streams with contrasting flow controls

Mellander

Jordan

Shore

et al. 2015

Hydrological Processes

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In this paper, we analyse 4 years of data from simultaneous high‐frequency monitoring of streamflow and phosphorus (P) concentration. This was carried out to investigate hydrological flow paths and P transfer pathways from diffuse sources in two intensively farmed river catchments (~10 km2) with contrasting flow controls and dominating flow paths. Catchment scale P loss was viewed on an annual and event flow basis and related to hydrological flow paths. A grassland catchment with mostly poorly drained soils, and a higher Q10:Q90 ratio (60 compared with 24), had three times higher annual P loss than an arable catchment with mostly well‐drained soils (1.04 compared with 0.34 kg TP ha−1) despite the arable catchment having larger areas with high soil P status and more discharge. Neither of the catchments indicated supply limitations. The magnitude of the P losses from the two catchments was not defined by land use, source pressure or discharge volume but rather by more basic rainfall‐to‐runoff partitioning influences that determine proportions of quickflow and slowflow. There were larger differences between the years than between the catchments, and the P loss of the arable catchment appeared more sensitive to climate. The results confirmed the need to manage the quickflow components of runoff to moderate P transfers. Therefore, in order to further reduce diffuse pollution it may be necessary to account for the contrast in hydrological function before or in addition to any of the other factors known to influence P losses from catchments (such as soil P and land use). Schemes designed to attenuate diffuse P after mobilization from soil surfaces can then be targeted (and resourced) more effectively. Copyright © 2014 John Wiley & Sons, Ltd.

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Section: Discussionmentioning

confidence: 99%

Flow paths and phosphorus transfer pathways in two agricultural streams with contrasting flow controls

Mellander

Jordan

Shore

et al. 2015

Hydrological Processes

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“…Glendell and Brazier, 2014;Steegen et al, 2000;Thompson et al, 2013). Likewise, studies have sought to characterise the nature of P losses from headwater agricultural catchments (e.g.…”

Section: Introductionmentioning

confidence: 99%

Dominant mechanisms for the delivery of fine sediment and phosphorus to fluvial networks draining grassland dominated headwater catchments

Perks

Owen

Benskin

et al. 2015

Science of The Total Environment

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. (2015) 'Dominant mechanisms for the delivery of ne sediment and phosphorus to uvial networks draining grassland dominated headwater catchments.', Science of the total environment., 523 . pp. 178-190. Further information on publisher's website: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details.

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“…Nitrogen and P are two primary concerns of agricultural nonpoint‐source pollution and are generally assessed independently (Sharpley et al, 2003; Thompson et al, 2013; Benskin et al, 2014; Roberts et al, 2017). Source and transport factors have been used to classify N and P loss levels in most N and P index models (Sharpley et al, 2003; Drewry et al, 2011).…”

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confidence: 99%

An Integrated Approach to Identify Critical Source Areas of Agricultural Nonpoint‐Source Pollution at the Watershed Scale

et al. 2018

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Nonpoint sources are difficult to control because their nutrient contribution from different parts of a watershed can vary substantially. Identifying critical source areas of nutrient loss is an important step in watershed pollution mitigation programs. This study sought to use an integrated index model to differentiate between subbasins that serve as critical source areas of N and P nonpoint sources of pollution in China's Tiaoxi watershed. In contrast with previous N and P indices, multiple sources of pollution (i.e., agronomic activity, domestic wastewater, livestock farming, and aquaculture) were considered. Nitrogen and P source factors (i.e., N and P annual export loads) and transport factors were multiplied to determine the overall risk of nutrient loss in the integrated index model. Critical source areas were identified by a higher nutrient loss index. Of the 92 subbasins within the Tiaoxi watershed, 13 were determined to be critical sources for N, 10 for P, and seven for both N and P. Critical source area identification corresponds well with water quality data from the subbasins. The results show the potential use of the integrated index model for prioritizing and targeting watershed pollution mitigation activities at the subbasin level.

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Predicting critical source areas of sediment in headwater catchments

Cited by 32 publications

References 70 publications

Flow paths and phosphorus transfer pathways in two agricultural streams with contrasting flow controls

Flow paths and phosphorus transfer pathways in two agricultural streams with contrasting flow controls

Dominant mechanisms for the delivery of fine sediment and phosphorus to fluvial networks draining grassland dominated headwater catchments

An Integrated Approach to Identify Critical Source Areas of Agricultural Nonpoint‐Source Pollution at the Watershed Scale

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