Title

Magnitude-frequency analysis of suspended sediment loads in the subtropical Richmond River basin, northern New South Wales, Australia

Document Type

Presentation

Publication details

McKee, LJ, Hossain, S & Eyre, BD 2002, 'Magnitude-frequency analysis of suspended sediment loads in the subtropical Richmond River basin, northern New South Wales, Australia ', in FJ Dyer, MC Thoms & JM Olley (eds), The Structure, Function and Management Implications of Fluvial Sedimentary Systems: Proceedings of an International Symposium, Alice Springs, N.T, Australia, International Association of Hydrological Sciences, Wallingford, England, pp. 289-296. ISBN: 1901502961

Abstract

Data from coastal northern New South Wales, Australia, are used to provide an analysis of magnitude and frequency characteristics in a subtropical river. Over a 14-year period, annual discharge varied by 26 times, suspended sediment (SS) load varied 910 times from 668 t to 607 671 t (mean = 105 6201 year"1 ) and 90% of the SS load was transported in only 2.3% of the time. The 4000^-999 Ml day"' discharge class appears to be most effective for S S transport. The centroid of the annual series (4500 Ml day"1 or 52 m3 s"1 ) has a return interval of 1.01 years. Discharges in this class occurred for 68 days (an average of five days per year) and carried 50 857 t SS (3.4% of the total). There may be multiple effective discharges that may be verified by channel features. Future field studies are planned to test this hypothesis.