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Catchment Phosphorous Losses: An Export Coefficient Modelling Approach with Scenario Analysis for Water Management

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  • Nuno-Gonçalo Matias
  • Penny Johnes

Abstract

This paper presents the development of an export coefficient model to characterise the rates and sources of P export from land to water in four reservoir systems located in a semi-arid rural region in southern of Portugal. The model was developed to enable effective management of these important water resource systems under the EU Water Framework Directive. This is the first time such an approach has been fully adapted for the semi-arid systems typical of Mediterranean Europe. The sources of P loading delivered to each reservoir from its catchment were determined and scenario analysis was undertaken to predict the likely impact of catchment management strategies on the scale of rate of P loading delivered to each water body from its catchment. The results indicate the importance of farming and sewage treatment works/collective septic tanks discharges as the main contributors to the total diffuse and point source P loading delivered to the reservoirs, respectively. A reduction in the total P loading for all study areas would require control of farming practices and more efficient removal of P from human wastes prior to discharge to surface waters. The scenario analysis indicates a strategy based solely on reducing the agricultural P surplus may result in only a slow improvement in water quality, which would be unlikely to support the generation of good ecological status in reservoirs. The model application indicates that a reduction of P-inputs to the reservoirs should first focus on reducing P loading from sewage effluent discharges through the introduction of tertiary treatment (P-stripping) in all major residential areas. The fully calibrated export coefficient modelling approach transferred well to semi-arid regions, with the only significant limitation being the availability of suitable input data to drive the model. Further studies using this approach in semi-arid catchments are now needed to increase the knowledge of nutrient export behaviours in semi-arid regions. Copyright Springer Science+Business Media B.V. 2012

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  • Nuno-Gonçalo Matias & Penny Johnes, 2012. "Catchment Phosphorous Losses: An Export Coefficient Modelling Approach with Scenario Analysis for Water Management," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 26(5), pages 1041-1064, March.
    • Handle: RePEc:spr:waterr:v:26:y:2012:i:5:p:1041-1064
    DOI: 10.1007/s11269-011-9946-3
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    1. Xiao Pu & Hongguang Cheng & Lu Lu & Shengtian Yang & Jing Xie & Fanghua Hao, 2015. "Spatial Profiling and Assessing Dominance of Sources to Water Phosphorus Burden in a Shallow Lake," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 29(3), pages 715-729, February.
    2. Man Zhang & Xiaolong Chen & Shuihua Yang & Zhen Song & Yonggui Wang & Qing Yu, 2021. "Basin-Scale Pollution Loads Analyzed Based on Coupled Empirical Models and Numerical Models," IJERPH, MDPI, vol. 18(23), pages 1-19, November.
    3. Reartes, S.B. Rodriguez & Estrada, V. & Bazán, R. & Larrosa, N. & Cossavella, A. & López, A. & Busso, F. & Diaz, M.S., 2016. "Evaluation of ecological effects of anthropogenic nutrient loading scenarios in Los Molinos reservoir through a mathematical model," Ecological Modelling, Elsevier, vol. 320(C), pages 393-406.
    4. Yuliya Vystavna & Josef Hejzlar & Jiří Kopáček, 2017. "Long-term trends of phosphorus concentrations in an artificial lake: Socio-economic and climate drivers," PLOS ONE, Public Library of Science, vol. 12(10), pages 1-18, October.
    5. O. Tzoraki & D. Cooper & G. Dörflinger & P. Panagos, 2014. "A new MONERIS in-Stream Retention Module to Account Nutrient Budget of a Temporary River in Cyprus," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 28(10), pages 2917-2935, August.

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