An evaluation of catchment-scale phosphorus mitigation using load apportionment modelling

Greene, Sheila; Taylor, David; McElarney, Y.; Foy, R. H.; Jordan, Phillip

doi:10.1016/j.scitotenv.2011.02.016

Cited by 52 publications

(46 citation statements)

References 63 publications

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“…4). These results are comparable with previous LAM applications (Bowes et al, 2008(Bowes et al, , 2009a(Bowes et al, , 2009b(Bowes et al, , 2010(Bowes et al, , 2014Greene et al, 2011;Chen et al, 2013), as well as SWAT, AGNPS, HSPF and INCA-P applications [reviewed by Moriasi et al (2007) and Jackson-Blake et al (2015)], where NS N 0.20 and R 2 N 0.20 for daily TP concentration simulation results were considered acceptable for NPS pollution dominated watersheds. Monthly and annual riverine TP loads estimated by the LAM were further compared to those obtained with the LOADEST model (Supplementary material: Fig.…”

Section: Modeling Of Phosphorus-water Discharge Relationshipssupporting

confidence: 88%

“…Based on the fundamental hydrological differences between nutrient inputs from PS and NPS to rivers, a load apportionment model (LAM) may be developed for statistically quantifying point and nonpoint source nutrient inputs as a power-law function of river discharge (Bowes et al, 2008(Bowes et al, , 2009a(Bowes et al, , 2009b(Bowes et al, , 2010(Bowes et al, , 2014Greene et al, 2011;Chen et al, 2013). The LAM does not require detailed watershed attribute information and can potentially be applied to any dataset comprised of paired P concentrations and river discharge measurements.…”

Section: Introductionmentioning

confidence: 99%

“…The LAM does not require detailed watershed attribute information and can potentially be applied to any dataset comprised of paired P concentrations and river discharge measurements. This approach has been successfully applied to a wide range of watersheds in England, Ireland, U.S.A. and China (Bowes et al, 2008(Bowes et al, , 2009a(Bowes et al, , 2009b(Bowes et al, , 2010(Bowes et al, , 2014Greene et al, 2011;Jarvie et al, 2012;Chen et al, 2013). In terms of long-term riverine P source apportionment, however, existing LAM applications encounter some important limitations.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Reconstructing historical changes in phosphorus inputs to rivers from point and nonpoint sources in a rapidly developing watershed in eastern China, 1980–2010

Chen

Guo

et al. 2015

Science of The Total Environment

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Section: Modeling Of Phosphorus-water Discharge Relationshipssupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Reconstructing historical changes in phosphorus inputs to rivers from point and nonpoint sources in a rapidly developing watershed in eastern China, 1980–2010

Chen

Guo

et al. 2015

Science of The Total Environment

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“…Although the input data is the same (paired nutrient concentration and flow data), the two approaches are subtly different. Nutrient concentration-flow relationships (usually at weekly temporal resolution) have been used in previous studies to infer the relative nutrient contributions to the river from constant and rain-related inputs , using the Load Apportionment Modelling approach (Bowes et al, 2008;Bowes et al, 2009a;Chen et al, 2013;Greene et al, 2011;Jarvie et al, 2012;Jarvie et al, 2010). A river dominated by constant nutrient inputs (largely equivalent to STW effluent inputs in the UK) will form a dilution curve with negative gradient as flow increases.…”

Section: Introductionmentioning

confidence: 99%

Characterising phosphorus and nitrate inputs to a rural river using high-frequency concentration–flow relationships

Bowes

Jarvie

Halliday

et al. 2015

Science of The Total Environment

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143

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Characterising phosphorus and nitrate inputs to a rural river using highfrequency concentration-flow relationships.Contact CEH NORA team at noraceh@ceh.ac.ukThe NERC and CEH trademarks and logos ('the Trademarks') are registered trademarks of NERC in the UK and other countries, and may not be used without the prior written consent of the Trademark owner. AbstractThe total reactive phosphorus (TRP) and nitrate concentrations of the River Enborne, southern England, were monitored at hourly interval between January 2010 and December 2011. The relationships between these high-frequency nutrient concentration signals and flow were used to infer changes in nutrient source and dynamics through the annual cycle and each individual storm event, by studying hysteresis patterns. TRP concentrations exhibited strong dilution patterns with increasing flow, and predominantly clockwise hysteresis through storm events. Despite the Enborne catchment being relatively rural for southern England, TRP inputs were dominated by constant, non-rain-related inputs from sewage treatment works (STW) for the majority of the year, producing the highest phosphorus concentrations through the spring-summer growing season. At higher river flows, the majority of the TRP load was derived from within-channel remobilisation of phosphorus from the bed sediment, much of which was also derived from STW inputs. Therefore, future phosphorus 2 mitigation measures should focus on STW improvements. Agricultural diffuse TRP inputs were only evident during storms in the May of each year, probably relating to manure application to land. The nitrate concentration-flow relationship produced a series of dilution curves, indicating major inputs from groundwater and to a lesser extent STW. Significant diffuse agricultural inputs with anticlockwise hysteresis trajectories were observed during the first major storms of the winter period.The simultaneous investigation of high-frequency time series data, concentration-flow relationships and hysteresis behaviour through multiple storms for both phosphorus and nitrate offers a simple and innovative approach for providing new insights into nutrient sources and dynamics.

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“…This monitoring is often spatially rich in terms of river network coverage but temporally poor and, as storm driven diffuse P transfers from agricultural land tend to form very significant contributions Published by Copernicus Publications on behalf of the European Geosciences Union. 3094 P. Jordan and R. Cassidy: Assessing a 24/7 solution for monitoring water quality loads to annual loads in rivers (Greene et al, 2011), low frequency monitoring may be insufficient to monitor these transfers. This has potentially serious implications as competent authorities are charged with implementing agricultural mitigation measures within legislation and monitoring the benefits at catchment scale (Mainstone et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Technical Note: Assessing a 24/7 solution for monitoring water quality loads in small river catchments

Jordan

Cassidy

2011

Hydrol. Earth Syst. Sci.

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Abstract. Quantifying nutrient and sediment loads in catchments is difficult owing to diffuse controls related to storm hydrology. Coarse sampling and interpolation methods are prone to very high uncertainties due to under-representation of high discharge, short duration events. Additionally, important low-flow processes such as diurnal signals linked to point source impacts are missed. Here we demonstrate a solution based on a time-integrated approach to sampling with a standard 24 bottle autosampler configured to take a sample every 7 h over a week according to a Plynlimon design. This is evaluated with a number of other sampling strategies using a two-year dataset of sub-hourly discharge and phosphorus concentration data. The 24/7 solution is shown to be among the least uncertain in estimating load (inter-quartile range: 96 % to 110 % of actual load in year 1 and 97 % to 104 % in year 2) due to the increased frequency raising the probability of sampling storm events and point source signals. The 24/7 solution would appear to be most parsimonious in terms of data coverage and certainty, process signal representation, potential laboratory commitment, technology requirements and the ability to be widely deployed in complex catchments.

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An evaluation of catchment-scale phosphorus mitigation using load apportionment modelling

Cited by 52 publications

References 63 publications

Reconstructing historical changes in phosphorus inputs to rivers from point and nonpoint sources in a rapidly developing watershed in eastern China, 1980–2010

Reconstructing historical changes in phosphorus inputs to rivers from point and nonpoint sources in a rapidly developing watershed in eastern China, 1980–2010

Characterising phosphorus and nitrate inputs to a rural river using high-frequency concentration–flow relationships

Technical Note: Assessing a 24/7 solution for monitoring water quality loads in small river catchments

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