Sediment sources and channel dynamics, Daly River, Northern Australia

Robert Wasson, L FURLONGER, David Parry, T PIETSCH, Eric Valentine, D WILLIAMS

    Research output: Contribution to journalArticleResearchpeer-review

    Abstract

    The Daly River occupies a mainly undisturbed large catchment in the Australian wet-dry tropics. Concerns about possible increased sediment input to the River from clearing and cropping have motivated this study of fine sediment sources. Using geochemical tracers for both modern sediments and alluvial bench deposits, it is shown that, for the last ~ 30�years, 89-97% of the fine sediment originates from erosion by gullying and channel change. There is no discernible input of top soil from the cleared land adjacent to the Daly River in the study area. The analysis and OSL dating of the alluvial benches have also provided data on the age of (and inferences about the causes of) bench formation, flood frequency change, sedimentation rate change, and episodes of sand transport. The benches are being destroyed as the channel widens (contributing sediment to the river) and the bed of the Daly appears to be shallowing, both responses to increased overbank flows. The sediment source created by channel widening is almost all the result of hydrologic change, with no discernible role for land use. � 2009.
    Original languageEnglish
    Pages (from-to)161-174
    Number of pages14
    JournalGeomorphology
    Volume114
    Issue number3
    Publication statusPublished - 2009

    Fingerprint

    river
    sediment
    overbank flow
    channel change
    flood frequency
    sedimentation rate
    alluvial deposit
    topsoil
    cropping practice
    tracer
    catchment
    erosion
    land use
    sand
    analysis
    dating
    land
    tropics

    Cite this

    Wasson, R., FURLONGER, L., Parry, D., PIETSCH, T., Valentine, E., & WILLIAMS, D. (2009). Sediment sources and channel dynamics, Daly River, Northern Australia. Geomorphology, 114(3), 161-174.
    Wasson, Robert ; FURLONGER, L ; Parry, David ; PIETSCH, T ; Valentine, Eric ; WILLIAMS, D. / Sediment sources and channel dynamics, Daly River, Northern Australia. In: Geomorphology. 2009 ; Vol. 114, No. 3. pp. 161-174.
    @article{4834b59da5f14fb4a07e9a6507832a6e,
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    abstract = "The Daly River occupies a mainly undisturbed large catchment in the Australian wet-dry tropics. Concerns about possible increased sediment input to the River from clearing and cropping have motivated this study of fine sediment sources. Using geochemical tracers for both modern sediments and alluvial bench deposits, it is shown that, for the last ~ 30�years, 89-97{\%} of the fine sediment originates from erosion by gullying and channel change. There is no discernible input of top soil from the cleared land adjacent to the Daly River in the study area. The analysis and OSL dating of the alluvial benches have also provided data on the age of (and inferences about the causes of) bench formation, flood frequency change, sedimentation rate change, and episodes of sand transport. The benches are being destroyed as the channel widens (contributing sediment to the river) and the bed of the Daly appears to be shallowing, both responses to increased overbank flows. The sediment source created by channel widening is almost all the result of hydrologic change, with no discernible role for land use. � 2009.",
    keywords = "alluvial deposit, channel change, erosion, hydrological change, luminescence dating, sediment transport, Australasia, Australia, Daly River, Northern Territory",
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    year = "2009",
    language = "English",
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    Wasson, R, FURLONGER, L, Parry, D, PIETSCH, T, Valentine, E & WILLIAMS, D 2009, 'Sediment sources and channel dynamics, Daly River, Northern Australia', Geomorphology, vol. 114, no. 3, pp. 161-174.

    Sediment sources and channel dynamics, Daly River, Northern Australia. / Wasson, Robert; FURLONGER, L; Parry, David; PIETSCH, T; Valentine, Eric; WILLIAMS, D.

    In: Geomorphology, Vol. 114, No. 3, 2009, p. 161-174.

    Research output: Contribution to journalArticleResearchpeer-review

    TY - JOUR

    T1 - Sediment sources and channel dynamics, Daly River, Northern Australia

    AU - Wasson, Robert

    AU - FURLONGER, L

    AU - Parry, David

    AU - PIETSCH, T

    AU - Valentine, Eric

    AU - WILLIAMS, D

    PY - 2009

    Y1 - 2009

    N2 - The Daly River occupies a mainly undisturbed large catchment in the Australian wet-dry tropics. Concerns about possible increased sediment input to the River from clearing and cropping have motivated this study of fine sediment sources. Using geochemical tracers for both modern sediments and alluvial bench deposits, it is shown that, for the last ~ 30�years, 89-97% of the fine sediment originates from erosion by gullying and channel change. There is no discernible input of top soil from the cleared land adjacent to the Daly River in the study area. The analysis and OSL dating of the alluvial benches have also provided data on the age of (and inferences about the causes of) bench formation, flood frequency change, sedimentation rate change, and episodes of sand transport. The benches are being destroyed as the channel widens (contributing sediment to the river) and the bed of the Daly appears to be shallowing, both responses to increased overbank flows. The sediment source created by channel widening is almost all the result of hydrologic change, with no discernible role for land use. � 2009.

    AB - The Daly River occupies a mainly undisturbed large catchment in the Australian wet-dry tropics. Concerns about possible increased sediment input to the River from clearing and cropping have motivated this study of fine sediment sources. Using geochemical tracers for both modern sediments and alluvial bench deposits, it is shown that, for the last ~ 30�years, 89-97% of the fine sediment originates from erosion by gullying and channel change. There is no discernible input of top soil from the cleared land adjacent to the Daly River in the study area. The analysis and OSL dating of the alluvial benches have also provided data on the age of (and inferences about the causes of) bench formation, flood frequency change, sedimentation rate change, and episodes of sand transport. The benches are being destroyed as the channel widens (contributing sediment to the river) and the bed of the Daly appears to be shallowing, both responses to increased overbank flows. The sediment source created by channel widening is almost all the result of hydrologic change, with no discernible role for land use. � 2009.

    KW - alluvial deposit

    KW - channel change

    KW - erosion

    KW - hydrological change

    KW - luminescence dating

    KW - sediment transport

    KW - Australasia

    KW - Australia

    KW - Daly River

    KW - Northern Territory

    M3 - Article

    VL - 114

    SP - 161

    EP - 174

    JO - Geomorphology

    JF - Geomorphology

    SN - 0169-555X

    IS - 3

    ER -

    Wasson R, FURLONGER L, Parry D, PIETSCH T, Valentine E, WILLIAMS D. Sediment sources and channel dynamics, Daly River, Northern Australia. Geomorphology. 2009;114(3):161-174.