Abstract
The accumulation of monosulfidic sediments in inland waterways is emerging as a major environmental issue. Mobilisation and suspension of monosulfidic sediments can result in deoxygenation, acidification of the water column and mobilisation of trace metals. The controls on monosulfidic sediment mobilisation and the critical thresholds for its scour and entrainment have not been established. This study examines the effect of a minor flood event (average return interval of 5 years) on sulfidic sediment scour in the Wakool River in southern NSW, Australia. Five profiles were sampled within a small (~300 m) reach before and after a minor flood event to determine the degree of sediment scour and transport. The results indicate substantial scour of both monosulfidic sediments and underlying bed sediments (approximately 2100 m3). Changes in the sediment geochemistry suggest large concentrations of monosulfidic sediments had been suspended in the water column, partially-oxidised and redeposited. This is supported by 210Pb results from one of the profiles. These results suggest that these monosulfidic sediments can move as bed load during minor flood events.
| Original language | English |
|---|---|
| Pages (from-to) | 330-339 |
| Number of pages | 10 |
| Journal | Journal of Environmental Management |
| Volume | 112 |
| DOIs | |
| Publication status | Published - 2012 |
| Externally published | Yes |
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Mobilisation, alteration, and redistribution of monosulfidic sediments in inland river systems. / Cheetham, M. D.; Wong, V. N L; Bush, R. T.; Sullivan, L. A.; Ward, N. J.; Zawadzki, A.
In: Journal of Environmental Management, Vol. 112, 2012, p. 330-339.Research output: Contribution to journal › Article
TY - JOUR
T1 - Mobilisation, alteration, and redistribution of monosulfidic sediments in inland river systems
AU - Cheetham, M. D.
AU - Wong, V. N L
AU - Bush, R. T.
AU - Sullivan, L. A.
AU - Ward, N. J.
AU - Zawadzki, A.
PY - 2012
Y1 - 2012
N2 - The accumulation of monosulfidic sediments in inland waterways is emerging as a major environmental issue. Mobilisation and suspension of monosulfidic sediments can result in deoxygenation, acidification of the water column and mobilisation of trace metals. The controls on monosulfidic sediment mobilisation and the critical thresholds for its scour and entrainment have not been established. This study examines the effect of a minor flood event (average return interval of 5 years) on sulfidic sediment scour in the Wakool River in southern NSW, Australia. Five profiles were sampled within a small (~300 m) reach before and after a minor flood event to determine the degree of sediment scour and transport. The results indicate substantial scour of both monosulfidic sediments and underlying bed sediments (approximately 2100 m3). Changes in the sediment geochemistry suggest large concentrations of monosulfidic sediments had been suspended in the water column, partially-oxidised and redeposited. This is supported by 210Pb results from one of the profiles. These results suggest that these monosulfidic sediments can move as bed load during minor flood events.
AB - The accumulation of monosulfidic sediments in inland waterways is emerging as a major environmental issue. Mobilisation and suspension of monosulfidic sediments can result in deoxygenation, acidification of the water column and mobilisation of trace metals. The controls on monosulfidic sediment mobilisation and the critical thresholds for its scour and entrainment have not been established. This study examines the effect of a minor flood event (average return interval of 5 years) on sulfidic sediment scour in the Wakool River in southern NSW, Australia. Five profiles were sampled within a small (~300 m) reach before and after a minor flood event to determine the degree of sediment scour and transport. The results indicate substantial scour of both monosulfidic sediments and underlying bed sediments (approximately 2100 m3). Changes in the sediment geochemistry suggest large concentrations of monosulfidic sediments had been suspended in the water column, partially-oxidised and redeposited. This is supported by 210Pb results from one of the profiles. These results suggest that these monosulfidic sediments can move as bed load during minor flood events.
KW - Flood event
KW - Reduced inorganic sulfur
KW - Scour
KW - Sediment mobilisation
KW - Sulfidic sediments
KW - Water quality
UR - http://www.scopus.com/inward/record.url?scp=84865991145&partnerID=8YFLogxK
U2 - 10.1016/j.jenvman.2012.08.015
DO - 10.1016/j.jenvman.2012.08.015
M3 - Article
VL - 112
SP - 330
EP - 339
JO - Advances in Environmental Research
JF - Advances in Environmental Research
SN - 0301-4797
ER -