Entire Catchment and Buffer Zone Approaches to Modeling Linkage Between River Water Quality and Land Cover——A Case Study of Yamaguchi Prefecture, Japan

摘要

This study investigated the linkages between fiver water quality and land use in river catchments in Yama-guchi Prefecture, the western Japan, in order to examine the effect of land use changes of both entire catchment andbuffer zone on river water quality. Dissolved Oxygen (DO), pH, Biological Oxygen Demand (BOD), Suspended Solids(SS), Escherichia coli, Total Nitrogen (TN) and Total Phosphorus (TP) were eousidered as river water quality indica-tors. Satellite images were applied to generating the land use map. Multiple regression model was applied to linkingthe changes in the fiver water quality with the land uses in both entire catchment area and buffer zone. The results in-dicate that the integrative application of land use data from the entire catchment and the buffer zone could give rise tomore robust model to predict the concentrations of Suspended Solids (r2=0.88) and Total Nitrogen (r2=0.90), ratherthan models which separately considered land use data in catchment and buffer zone.