Whitehead, P. G. and Heathwaite, A. Louise and Flynn, N. J. and Wade, A. J. and Quinn, P. F. (2007) Evaluating the risk of nonpoint source pollution from biosolids:integrated modelling of nutrient losses at field and catchment scales. Hydrology and Earth Systems Science, 11 (1). pp. 601-613.
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A semi-distributed model, INCA, has been developed to determine the fate and distribution of nutrients in terrestrial and aquatic systems. The model simulates nitrogen and phosphorus processes in soils, groundwaters and river systems and can be applied in a semi-distributed manner at a range of scales. In this study, the model has been applied at field to sub-catchment to whole catchment scale to evaluate the behaviour of biosolid-derived losses of P in agricultural systems. It is shown that process-based models such as INCA, applied at a wide range of scales, reproduce field and catchment behaviour satisfactorily. The INCA model can also be used to generate generic information for risk assessment. By adjusting three key variables: biosolid application rates, the hydrological connectivity of the catchment and the initial P-status of the soils within the model, a matrix of P loss rates can be generated to evaluate the behaviour of the model and, hence, of the catchment system. The results, which indicate the sensitivity of the catchment to flow paths, to application rates and to initial soil conditions, have been incorporated into a Nutrient Export Risk Matrix (NERM).
|Journal or Publication Title:||Hydrology and Earth Systems Science|
|Additional Information:||© Author(s) 2007. This work is licensed under a Creative Commons License.|
|Subjects:||G Geography. Anthropology. Recreation > GE Environmental Sciences|
|Departments:||Faculty of Science and Technology > Lancaster Environment Centre|
|Deposited By:||Mr Richard Ingham|
|Deposited On:||18 Jan 2010 11:37|
|Last Modified:||14 Dec 2016 00:04|
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