The Danube river is the second biggest in Europe (2860 km length), his hydrographical basin cover in surface an 817 000 sqkm across a 17 countries, with 120 major tributaries.
The river is crossing the diverse geomorphologic units which permit to split the hydrological basin in three structural and functional units: the upper watershed (22 %), the middle watershed (50%) and the lower watershed (28%). The identification of the lower part of ecological Danube system (LDES), was performed in the inverse hierarchical order, based on system complexity this was sustained by the complementary fundamental and applied research projects (RFB, REDI, ERMAS, FAEWE, NICOLAS etc). The approach of the macro regional and regional complex of ecosystems like as hydrological basins are reflect the complex mechanisms and their spatial and temporal distributions.

Scientific fundamental principles like understanding of environment like an hierarchy of organized and dynamic units with quantifiable structural and functional properties are reflected already in politics and development strategies at the national and international levels (CBD – Rio 1992, DRPC 1994, DSAP-1995, BC- 2000). The identification of the ecosystems categories, their state parameters witch permitted to quantify the dynamics effects across the spatial and temporal scales. In this context the most important necessity is to adopt the optimal system to analyze and manage of datasets. The reflectance of phenomenon’s and process interdependence is based on use of mathematical models on adequate large and distributed databases.

Was established the objectives: 1. design of the informational system (IS) which include an database for management of biological and ecological systems; 2. To use the historical and developed datasets to support the management plans for the particular subcomponents of the lower part of the Danube ecological system. The actual tools like geodatabase structures with advance specific GIS functions will permit the integrated management of the natural and man dominated systems state parameters datasets. The use also of the integrated packages of mathematical models (ex: TOPMODEL) are permitted to accomplish the objective one and develop and informational system with ability to quantify the dynamics across space and time.

Use of the basic IS to support the management of particular component from LDES was performed for Small Island of Braila – protected area. The system is permitted the spatial zonation with specific managerial objectives based on productivity and support capacity of the natural capital: research and monitoring, conservation patrimonial heritage and local socio-economic development. The future development of the IS are possible in two mainly direction: complementary packages of mathematical models and impact assessment methodology integration.
fbo@rdslink.ro