The government has recently carried out monitoring to attain a better understanding of the current situation and model for
prediction of future events pertaining to water quality in the estuarine area of Yeongsan River. But many users have noted
difficulties to understand and utilize the results because most monitoring and model data consist of figures and text. The
aim of this study is to develop a GIS-based integrated information system to support the understanding of the current
situation and prediction of future events about water quality in the estuarine area of Yeongsan River. To achieve this, a
monitoring DB is assembled, a linkages model is defined, a GUI is composed, and the system development environment
and system composition are defined. The monitoring data consisted of observation data from 2010 ~ 2012 in the estuarine
area of Yeongsan River. The models used in the study are HSPF (Hydrological Simulation Program-Fortran) for simulation
of the basin and EFDC (Environmental Fluid Dynamics Code) for simulation of the estuary and river. Ultimately, a GIS
based system was presented for utilization and expression using monitoring and model data. The system supports prediction
of the estuarine area ecological environment quantitatively and displays document type model simulation results in a
map-based environment to enhance the user's spatial understanding. In future study, the system will be updated to include a
decision making support system that is capable of handling estuary environment issues and support environmental assessment
and development of related policies.