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The Maude Weir sediments. 2. Effect of weir storage on magnetic properties and associated chemistry
Author(s) -
Crockford R. H,
Willett I. R
Publication year - 2000
Publication title -
hydrological processes
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.222
H-Index - 161
eISSN - 1099-1085
pISSN - 0885-6087
DOI - 10.1002/1099-1085(20001015)14:14<2393::aid-hyp71>3.0.co;2-t
Subject(s) - weir , library science , computer science , geography , cartography
The magnetic properties of river sediments have been used to determine the sources of sediments. However, changes in magnetic properties during transport and sedimentation may occur. This paper examines the effect of reduction on the magnetic properties of sediments from the Maude Weir, NSW. For all sediment samples from the Maude Weir, for both cores and grab samples, there was an inverse relationship between particle size and concentration of magnetic minerals,as measured by magnetic susceptibility. The magnetic grain size, as measured by the ratio SIRM/, declined through the particle size range. This was attributed to dissolution of the finer grains of the magnetic minerals owing to the chemically reduced state of the sediments. As reducing conditions can alter both the concentration and magnetic grain size of sediments, it is important that the state of chemical reduction be considered when using mineral magnetism as a source tracer for dam sediments. There was a good relationship between total Fe and magnetic susceptibility and total phosphorus. The relationships mentioned above applied to all sediment samples and locations, even though there was substantial variation in the particle size distribution of the samples. Copyright © 2000 John Wiley & Sons, Ltd.