Integrated modelling in coastal lagoons. Part A: Watershed model - Sacca di Goro case study

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A fast growing economy and a more demanding population in Europe is leading to increasing socio-economic pressures and, large-scale landuse and landscape changes are taking place. An increasing pressure is put on water resources and conflicts are arising for water distribution among different stakeholders, and degradation of water quality is exacerbating the problem. To this purpose a modeling procedure was applied to evaluate and predict the surface and subsurface water quality and quantity as affected by anthropogenic activities in the Burano-Po di Volano watershed (Italy). The model was named ISSM (Integrated Surface and Subsurface model) is composed by the hydrological model (SWAT), the groundwater models (MODFLOW and MT3DMS) and the in-stream water quality model (QUAL2E).

The application of ISSM on the Burana Po di Volano watershed has been structured in two in two steps:

1)Data on soil water content and quality, and piezometric level were collected in a small sub-catchment, Bonello belonging to the great Burana Po di Volano watershed. These data have been used to test and validate ISSM.

2)ISSM has been applied to the whole watershed drainig into the Sacca di Goro, in order to evaluate the quantity of water draining to this coastal lagoon and its quality with respect to nitrogen and phosphorus concentration.

KEYWORDS: surface-groundwater model, diffuse pollution.

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