Modelling upland and instream erosion, sediment and phosphorus transport in a large catchment

✍ Scribed by Anthony J. Jakeman; Timothy R. Green; Sara G. Beavis; Li Zhang; Claude R. Dietrich; Peter F. Crapper

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 131 KB
• Volume: 13
• Category: Article
• ISSN: 0885-6087
• DOI: 10.1002/(sici)1099-1085(19990415)13:5<745::aid-hyp777>3.0.co;2-e

✦ Synopsis

This overview presents background information to place the subsequent papers by Beavis et al., Dietrich et al. and Green et al. in the context of a uni®ed approach. The modelling framework described here consists of two major components: an upland catchment model and an instream sediment transport model. The upland model simulates stream ¯ow (Q), suspended sediment (SS) and associated phosphorus (P) using rainfall data, and is calibrated to daily stream ¯ow time-series under historical conditions. The instream model routes SS and attached P from the outlet of upland catchments to gauging points downstream. The instream transport model can infer sources (resuspension and bank erosion) and sinks (deposition) within a reach. Aerial photographs are used to assess the on-site eects of climate and land cover/use on erosion and the drainage network. Changes in land cover/use and the eects on the drainage network are related to the parameters in the rainfall±runo model so that associated eects on Q (and hence SS and P) can be assessed. This modelling framework is prototyped on the Namoi Basin in northern New South Wales, Australia, and is described brie¯y herein.