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Modeling of non-point source pollution in a Mediterranean drainage basin

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SWAT ver. 2000 was used to predict hydrographs, and sediment, nitrate and total phosphorus loadings from a 1349 km2 mountainous/agricultural watershed in Northern Greece. The model was calibrated and verified using continuous meteorological data from eight stations within the drainage area, and runoff, sediment and nutrient concentrations measured at nine stations located within the main tributaries of the watershed, for the time period from May 1st, 1998 to January 31st, 2000. Model validation methodology and resulting input parameters appropriate for Mediterranean drainage basins are presented. Predicted by the model hydrographs, sedimentographs and pollutographs are plotted against observed values and show good agreement. Model performance is evaluated using the root mean square error computation and scattergrams of predicted versus observed data. The validated model is also used to test the effectiveness of three alternative cropping scenarios in reducing nutrient loadings from the agricultural part of the watershed. The study showed that this model, if properly validated, can be used effectively in testing management scenarios in Mediterranean drainage basins.

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Correspondence to Vassilios A. Tsihrintzis.

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Gikas, G.D., Yiannakopoulou, T. & Tsihrintzis, V.A. Modeling of non-point source pollution in a Mediterranean drainage basin. Environ Model Assess 11, 219–233 (2006). https://doi.org/10.1007/s10666-005-9017-3

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