A conceptual model of nutrient mobilisation and transport applicable at large catchment scales

N. R. Viney, M. Sivapalan, D. Deeley

Research output: Contribution to journalArticlepeer-review

Abstract

A conceptual model of nutrient mobilisation and transport is presented and coupled to a hydrological model, LASCAM. The model predicts catchment export of diffuse-source soluble and particulate phosphorus, particulate nitrogen, nitrate-nitrogen and ammonium-nitrogen. It explicitly includes the nutrient cycling processes of sorption, mineralisation, leaching, fixation, volatilisation, nitrification, denitrification, plant uptake and harvest losses. Soluble nutrients are assumed to be mobilised by surface runoff and by baseflow discharge, while particulate nutrients are associated with surface erosion and the stream sediment transport processes of deposition, re-entrainment, bed degradation and settling. The nutrient model includes 29 optimisable parameters, 11 for phosphorus and 18 for nitrogen, although several of these can be prescribed from measurements or from the literature. The model is applied to two large subcatchments of the 120,000 km2 Avon River basin in Western Australia and shown to provide good predictions of daily nutrient export in a long-term simulation.

Original languageEnglish (US)
Pages (from-to)23-44
Number of pages22
JournalJournal of Hydrology
Volume240
Issue number1-2
DOIs
StatePublished - Dec 31 2000
Externally publishedYes

Keywords

  • Nitrogen
  • Phosphorus water quality
  • Surface water
  • Theoretical models

ASJC Scopus subject areas

  • Water Science and Technology

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