La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Distributed, high-resolution modelling of critical source areas for erosion and phosphorus losses
Auteurs :	Faruk Djodjic, Auteur ; Ana Villa, Auteur
Type de document :	Article
Dans :	AMBIO (44 MAR 2015)
Article en page(s) :	S241-S251
Langues:	Anglais
Résumé :	Phosphorus losses from arable land need to be reduced to prevent eutrophication of surrounding waters. Owing to the high spatial variability of P losses, cost-effective countermeasures need to target parts of the catchment that are most susceptible to P losses. Field surveys identified critical source areas for overland flow and erosion amounting to only 0.4-2.6 % of total arable land in four different catchments in southern Sweden. Distributed modelling using high-resolution digital elevation data identified 72-96 % of these observed erosion and overland flow features. The modelling results were also successfully used to predict occurrence of overland flow and rill and gully erosion in a catchment in central Sweden. Such exact high-resolution modelling allows for accurate placement of planned countermeasures. However, current legislative and environmental subsidy programmes need to change their approach from income-loss compensation to rewarding high cost effectiveness of implemented countermeasures.

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