Modelling nutrient loads in large-scale river networks for the national land and water resources audit

[摘要] As a part of the National Land and Water Resources Audit (NLWRA), sediment and nutrient transport were modelled in large-scale networks across Australia. This report describes the nutrient transport model and its validation at the national scale. The model - ANNEX (Annual Network Nutrient Export) is a static model that predicts the average annual loads of phosphorus and nitrogen in each link in a river network under given catchment conditions. ANNEX is based on anode-link representation of a river network and because of its dependence on the suspended sediment budget, it is run in conjunction with the SedNet model (Prosser et al., 2001). For each link ANNEX required values for the sediment-bound and dissolved nutrient inputs from the river network estimating the losses associated with floodplain and reservoir sedimentation and instream denitrification. While the sediment-bound and dissolved nitrogen budgets are calculated separately, for phosphorus, the exchanges between the sediment-bound and dissolved nitrogen budgets are calculated separately, for phosphorus, the exchanges between the sediment-bound and dissolved phases during transport are modelled.

[发布机构] CSIRO Land and Water

[学科分类] 地球科学(综合)