Forschungs- & Entwicklungsinformationsdienst der Gemeinschaft - CORDIS


DITTY Berichtzusammenfassung

Project ID: EVK3-CT-2002-00084
Gefördert unter: FP5-EESD
Land: Italy

Result related to Sacca di Goro

Several international and national projects have been carried out in Sacca di Goro in the last decade providing data for a large number of variables relative to biogeochemical, climatic, environmental and socio-economic aspects. A large database was populated in the course of the Ditty Project including GIS maps for land use, land cover and hydrology of the watershed as well as for the Sacca di Goro lagoon.

The core system in the local economy of Sacca di Goro district is clam production. Around this key activity the environmental and economical systems of the Sacca were firstly described and evaluate with qualitative analysis because some of the dynamics between the factors playing a role in the Sacca di Goro system are still unknown or not quantified and the system remains partially specified. Moreover Network analysis model was developed on nitrogen cycling in Sacca di Goro considering several techniques for the systematic analysis of ecological flow networks.

Within the DITTY Project, the application and the reliability of the LOICZ biogeochemical model were analysed at different temporal and spatial scales. Firstly, the LBM was applied to the Sacca di Goro and other Italian lagoons following the standard procedure. Then, alternative assumptions were considered, taking into account benthic vegetation and sedimentary fluxes when enough information was available. In this way, the sensitivity of the basic LBM assumptions were evaluated and compared with alternative estimations. Finally, the LBM application was discussed thorough the inter-comparison of this set of Italian shallow coastal lagoons and within the context of the global LOICZ dataset.

A 3D integrated biogeochemical model was developed for the Sacca di Goro lagoon following several steps. A continuous biogeochemical model was developed to test and validate, as a function of experimental data available, an ecological and geochemical model in the water column and in sediments which took into account the main compartments in Sacca di Goro, i.e. nutrient, phytoplankton, zooplankton, bacteria, and to study their stability and dynamic characteristics without taking into account spatial effects. Then a discrete-stage based model of clam farming was developed, implemented and coupled with the previous model. Afterwards the spatial variability in the lagoon was considered implementing and validating a 3D hydrodynamic model using the COHERENS model, in which biogeochemical cycles as well as clam farming were incorporated. At the end, a watershed model (ISSM) was developed to evaluate and predict the surface and subsurface water quality and quantity as affected by anthropogenic activities. 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.

A series of scenarios was designed and quantified upon consideration of the main economical activities in the watershed-lagoon system. Information was then organised within a DPSIR scheme and the main options were identified and discussed with the decision makers and end-users. These are related to the development of the farming activity with an increase of the exploited area and integrated activities either in the lagoon or in the adjacent sea, the development of the Regional Park of the Po River Delta and land-based activities and the influence of climatic changes.

The socio-economic analysis of DITTY project included a stakeholder analysis with the objective of identifying gainers and losers for various management options. All these approaches were integrated in a Decision Support System (DSS) applied to the management of clam farming. Here, local authorities were asked to grant new farming concessions for aquaculture, and have to decide the amount of such concessions. The aquaculture revenue, expressed by the Net Present Value (NPV), was chosen as a pure economic criterion. On the other hand, the Lagoon Water Quality Index (LWQI) was developed and used to express a pure environmental criterion related to water quality. A mixed environmental and economical criterion was expressed through the ratio of the Wasted Exergy (WE) and the NPV for the aquaculture economic sector.

Several informal meetings were organised by DITTY participants with the local authorities and end-users in order to support scenario analysis and modelling activities as well as to disseminate the DSS and the other project results. Since the proposal of the DITTY project, the Sacca di Goro was included in the LaguNet network, a scientific observational network studying coastal lagoon ecology in Italy ( Studies on nutrients fluxes and other contaminants from lagoon catchments to the near coastal environment were developed and used as a template for similar studies in the DITTY consortium.

Verwandte Informationen


Pierluigi VIAROLI, (Professor of Ecology)
Tel.: +39-052-1905683
Fax: +39-052-1905402
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