Evaluation of the difference of eight model applications to assess diffuse annual nutrient losses from agricultural land

Schoumans, OF; Silgram, M; Walvoort, DJJ; Groenendijk, P; Bouraoui, F; Andersen, HE; Lo Porto, A; Reisser, H; Le Gall, G; Anthony, S; Arheimer, B; Johnsson, H; Panagopoulos, Y; Mimikou, M; Zweynert, U; Behrendt, H; Barr, A

dc.contributor.author	Schoumans, OF	en
dc.contributor.author	Silgram, M	en
dc.contributor.author	Walvoort, DJJ	en
dc.contributor.author	Groenendijk, P	en
dc.contributor.author	Bouraoui, F	en
dc.contributor.author	Andersen, HE	en
dc.contributor.author	Lo Porto, A	en
dc.contributor.author	Reisser, H	en
dc.contributor.author	Le Gall, G	en
dc.contributor.author	Anthony, S	en
dc.contributor.author	Arheimer, B	en
dc.contributor.author	Johnsson, H	en
dc.contributor.author	Panagopoulos, Y	en
dc.contributor.author	Mimikou, M	en
dc.contributor.author	Zweynert, U	en
dc.contributor.author	Behrendt, H	en
dc.contributor.author	Barr, A	en
dc.date.accessioned	2014-03-01T01:30:26Z
dc.date.available	2014-03-01T01:30:26Z
dc.date.issued	2009	en
dc.identifier.issn	14640325	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/19577
dc.subject	Agricultural Land	en
dc.subject	Nutrient Loss	en
dc.subject.other	nitrate	en
dc.subject.other	nitrogen	en
dc.subject.other	phosphorus	en
dc.subject.other	surface water	en
dc.subject.other	agricultural land	en
dc.subject.other	article	en
dc.subject.other	catchment	en
dc.subject.other	concentration (parameters)	en
dc.subject.other	data analysis	en
dc.subject.other	flow kinetics	en
dc.subject.other	intermethod comparison	en
dc.subject.other	Italy	en
dc.subject.other	Norway	en
dc.subject.other	nutrient content	en
dc.subject.other	priority journal	en
dc.subject.other	process model	en
dc.subject.other	soil analysis	en
dc.subject.other	statistical model	en
dc.subject.other	United Kingdom	en
dc.subject.other	Agriculture	en
dc.subject.other	Conservation of Natural Resources	en
dc.subject.other	Environmental Monitoring	en
dc.subject.other	Europe	en
dc.subject.other	Models, Theoretical	en
dc.subject.other	Reproducibility of Results	en
dc.subject.other	Rivers	en
dc.subject.other	Soil	en
dc.subject.other	Water Movements	en
dc.subject.other	Water Pollutants, Chemical	en
dc.subject.other	Water Pollution, Chemical	en
dc.title	Evaluation of the difference of eight model applications to assess diffuse annual nutrient losses from agricultural land	en
heal.type	journalArticle	en
heal.identifier.primary	10.1039/b823240g	en
heal.identifier.secondary	http://dx.doi.org/10.1039/b823240g	en
heal.publicationDate	2009	en
heal.abstract	The capability of eight nutrient models to predict annual nutrient losses (nitrogen and phosphorus) at catchment scale have been studied in the EUROHARP project. The methodologies involved in these models differ profoundly in their complexity, level of process representation and data requirements. This evaluation is focused on model performance in three core catchments: the Vansjø-Hobøl (Norway), the Ouse (Yorkshire, UK) and the Enza (Italy). These three different model applications have been evaluated by comparing calculated annual nutrient loads (total N or nitrate and total P), based on observed flow and total nitrogen or nitrate and total phosphorus concentrations, and the annual nutrient loads that were simulated by the eight nutrient models. Four statistics have been applied for this purpose: the root mean squared error (RMSE), the mean absolute error (MAE), the mean error (ME), and Nash-Sutcliffe's model efficiency (NS). The results show that all model approaches can predict the calculated annual discharges. Depending on the observed statistics (RMSE, MAE, ME and NS) the scores of the model application differed, therefore no overall 'best model' could be identified. Although the water and nutrient loads from (sub)catchments can be predicted, the modelled pathways of nutrients within agricultural land and the nutrient losses to surface waters from agricultural land vary among the catchments and among those model approaches which are able to make this distinction. © 2009 The Royal Society of Chemistry.	en
heal.journalName	Journal of Environmental Monitoring	en
dc.identifier.doi	10.1039/b823240g	en
dc.identifier.volume	11	en
dc.identifier.issue	3	en
dc.identifier.spage	540	en
dc.identifier.epage	553	en