The Romanian North Western coastal zone of the Black Sea and Danube delta is a mosaic of complex interacting ecosystems rich natural resources and socio-economic activity, for which the comprehensive knowledge of the physical and biogeochemical processes in the near-shore area represents an important aspect of integrated zone management. Dramatic changes in the Black Sea's ecosystem and resources were registered due to natural and anthropogenic causes (increase in the nutrient and pollutant load of rivers input, industrial and municipal wastewater pollution along the coast, and dumping on the open sea). Remote sensing provides a means for locating, identifying and mapping certain coastal features and assessing of spatio-temporal changes and their environmental impact. A scientific management system for protection, conservation and restoration must be based on reliable information on bio-geophysical and geomorphologic processes, coastal erosion, sedimentation dynamics, mapping of macrophyte fields water quality, climatic change effects. A multispectral and multitemporal data set (LANDSAT MSS, TM, ETM; SAR ERS-1; MODIS, ASTER) images over some selected areas in the vicinity of the Danube mouths and North-Western coastal zone of Black Sea. The main aim of this paper is to conduct a comprehensive analysis based on existing historical and more recent in situ and remote sensing data to establish the link between phytoplankton bloom development increasing erosion and diminishing of beaches and related coastal zone harmful phenomena between 1975 and 2003 and also the sediment discharge and depositing regime in the delta near the Danube mouths and Black Sea.
