Infrastructure for Grid-Based Virtual Organizations

This paper presents architecture of a collaborative computation environment based on a Grid infrastructure, used as a support for large scientific virtual organizations. The environment consists primarily of a collaborationsupporting user interface, workflow system capable of submission of jobs to the Grid and a Grid-based data management suite. A prototype of such an environment is deployed and tested for a flood forecasting system. The system consists of workflow system for executing simulation cascade of meteorological, hydrological and hydraulic models, data management system for storing and accessing different computed and measured data, and a set of web portals.