FIELD MEASUREMENTS ON SEDIMENT, NUTRIENT AND ORGANIC MATTER TRANSPORTS IN AN URBAN RIVER ESTUARY

For understanding pollutant transports in an urban river, the field measurements of the hydrodynamic environments and SS during one month were carried out in the estuarine section of Oohori River and Lake Teganuma. We also conducted the intensive field survey of the sediment, nutrient and organic matter transports in Oohori River under a rainy condition. The observed results show that the differences of SS fluxes between Stns. 1 and 3, located at upstream and downstream points in the estuarine section, appear appreciably in hydrologic events and depends on the erosion process of river-bed deposits and flow rate in the river. The differences of nutrient and organic matter fluxes between Stns. 1 and 3 in the hydrologic event are also characterized with the erosion process.