抄録
In this study, application of geographic information system, GIS, to development of a framework for pollutant load analysis in Onga area was discussed. Total-nitrogen, total-phosphate, and chemical oxygen demand were used for analysing pollutant load. The pollutants density and/or distribution of point and non-point sources in Onga area were demonstrated by using GIS data. The concentrations of T-N and T-P in the Onga River are affected by the area ratio of paddy field to forest. The ratio of population to forest area influences COD concentrations in the Onga River.
