title: Insight into dissolved organic matter fractions in Lake Wivenhoe during and after a major flood.
abstract: Dissolved organic matter is an important component of biogeochemical processes in aquatic environments. Dissolved organic matter may consist of a myriad of different fractions and resultant processing pathways. In early January 2011, heavy rainfall occurred across South East Queensland, Australia causing significant catchment inflow into Lake Wivenhoe, which is the largest water supply reservoir for the city of Brisbane, Australia. The horizontal and vertical distributions of dissolved organic matter fractions in the lake during the flood period were investigated and then compared with stratified conditions with no catchment inflows. The results clearly demonstrate a large variation in dissolved organic matter fractions associated with inflow conditions compared with stratified conditions. During inflows, dissolved organic matter concentrations in the reservoir were fivefold lower than during stratified conditions. Within the dissolved organic matter fractions during inflow, the hydrophobic and humic acid fractions were almost half those recorded during the stratified period whilst low molecular weight neutrals were higher during the flood period compared to during the stratified period. Information on dissolved organic matter and the spatial and vertical variations in its constituents' concentrations across the lake can be very useful for catchment and lake management and for selecting appropriate water treatment processes.
authors.affiliation: Centre for Water Management and Reuse, School of Natural and Built Environments, University of South Australia, Mawson Lakes, 5095, SA, Australia. rupak.aryal@unisa.edu.au.
authors.forename: Rupak
authors.initials: R
authors.lastname: Aryal
authors.affiliation: School of Civil Engineering, University of Queensland, St Lucia, 4072, Australia. a.grinham@uq.edu.au.
authors.forename: Alistair
authors.initials: A
authors.lastname: Grinham
authors.affiliation: Division of Information Technology, Engineering and the Environment, University of South Australia, Mawson Lakes, 5095, SA, Australia. Simon.Beecham@unisa.edu.au.
authors.forename: Simon
authors.initials: S
authors.lastname: Beecham
mesh_terms: D004784:Environmental Monitoring; D055868:Floods; D006812:Humic Substances / Q000032:analysis*; D060106:Lakes / Q000737:chemistry*; D011793:Queensland; D014873:Water Pollutants / Q000032:analysis*; D014881:Water Supply
chemical_list: D006812:Humic Substances; D014873:Water Pollutants
keywords: Dissolved organic matter; Flooding; Molecular weight distribution; Reservoir water quality
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