CSIRO Publishing blank image blank image blank image blank imageBooksblank image blank image blank image blank imageJournalsblank image blank image blank image blank imageAbout Usblank image blank image blank image blank imageShopping Cartblank image blank image blank image You are here: Journals > Marine & Freshwater Research   
Marine & Freshwater Research
Journal Banner
  Advances in the Aquatic Sciences
 
blank image Search
 
blank image blank image
blank image
 
  Advanced Search
   

Journal Home
About the Journal
Editorial Board
Contacts
Content
Online Early
Current Issue
Just Accepted
All Issues
Special Issues
Research Fronts
Sample Issue
For Authors
General Information
Instructions to Authors
Submit Article
Open Access
For Referees
General Information
Review Article
Referee Guidelines
Annual Referee Index
For Subscribers
Subscription Prices
Customer Service
Print Publication Dates

blue arrow e-Alerts
blank image
Subscribe to our Email Alert or RSS feeds for the latest journal papers.

red arrow Connect with us
blank image
facebook twitter youtube

 

Article << Previous     |         Contents Vol 48(1)

Export of nutrients and suspended sediment during a cyclone-mediated flood event in the Herbert River catchment, Australia

A. W. Mitchell, R. G. V. Bramley and A. K. L. Johnson

Marine and Freshwater Research 48(1) 79 - 88
Published: 1997

Abstract

Changes in the river chemistry of the Herbert River (northern Queensland) during a flood event that followed Cyclone Sadie in January 1994 are presented. Parallel data sets collected by AIMS and CSIRO were generally well correlated. Around the flood peak, concentrations of dissolved inorganic nutrients declined to a minimum, whereas particulate nutrient concentrations increased to a maximum (particulate nitrogen, 1200 µg N L-1; particulate phosphorus, 225 µg P L-1). Concentrations of dissolved organic nutrients varied erratically. Concentrations of silicate and potassium, pH and electrical conductivity varied inversely with discharge. Good correlations were observed between the concentrations of particulates and concurrent discharge, with differing relationships existing during the rising and falling stages of the flood. It is estimated that this flood event resulted in the export of at least 600 t of N, 65 t of P and 100000 t of suspended sediments over a period of six and a half days, with most transport (85%) occurring within the first two days. Particulate fractions of N (50%) and P (80%) constituted the bulk of the nutrient flux. This study illustrates the potential for high nutrient exports during brief flood events from intensively farmed agricultural land within tropical catchments.

Keywords: runoff.



Full text doi:10.1071/MF96021

© CSIRO 1997

blank image
Subscriber Login
Username:
Password:  

 
PDF (690 KB) $25
 Export Citation
 Print
  
    
Legal & Privacy | Contact Us | Help

CSIRO

© CSIRO 1996-2014