Channel recovery in a regulated river

Effects of an experimental and natural flood in the Snowy River, SE Australia

Teresa Rose, Wayne Erskine, Brett Miners

    Research output: Contribution to journalArticleResearchpeer-review

    Abstract

    Experimental floods, generated downstream of dams, are used to recover specific bio-geomorphic functions in regulated rivers. Studies of the effects of experimental floods vary in their objective, location, and the hydrological and bio-geomorphic variables used to quantify recovery. Measurements of geomorphic change are required to guide future release strategies. The focus of this study was to determine if a large experimental flood in the Snowy River Australia, could promote geomorphic recovery of the river channel downstream of Jindabyne Dam following 35 years of flow regulation. The objectives of the release were to deepen, widen, and increase channel capacity and coarsen the riverbed substratum in the Jindabyne Gorge and Dalgety Uplands sections of the Snowy River. Data from the release were compared with that of a natural flood event that occurred after the experimental flow event. Both events showed channel adjustments and a degree of geomorphic recovery, but this varied between the two river sections. Marked channel adjustments occurred in the Dalgety Uplands reach following both the experimental and natural flood event and in the Jindabyne Gorge section following the natural flood event. Geomorphic changes were related to the hydrological character of each flood event. The number of flood peaks, the sequence of peaks, the flood duration, and the total energy expenditure differed markedly between the two events, and these four flood hydrological characteristics explained the greater geomorphic recovery associated with the natural flood event in the Jindabyne Gorge. No clear hydro-geomorphic relationship was derived for channel change in the Dalgety Uplands where existing morphological constraints limit flood effectiveness.

    Original languageEnglish
    Pages (from-to)1-13
    Number of pages13
    JournalRiver Research and Applications
    DOIs
    Publication statusE-pub ahead of print - 20 Aug 2019

    Fingerprint

    Rivers
    Recovery
    river
    gorge
    Dams
    effect
    dam
    channel change
    flow regulation
    Channel capacity
    river channel
    expenditure

    Cite this

    @article{9e9ca288c4f34121a46c4c5ce655b4b5,
    title = "Channel recovery in a regulated river: Effects of an experimental and natural flood in the Snowy River, SE Australia",
    abstract = "Experimental floods, generated downstream of dams, are used to recover specific bio-geomorphic functions in regulated rivers. Studies of the effects of experimental floods vary in their objective, location, and the hydrological and bio-geomorphic variables used to quantify recovery. Measurements of geomorphic change are required to guide future release strategies. The focus of this study was to determine if a large experimental flood in the Snowy River Australia, could promote geomorphic recovery of the river channel downstream of Jindabyne Dam following 35 years of flow regulation. The objectives of the release were to deepen, widen, and increase channel capacity and coarsen the riverbed substratum in the Jindabyne Gorge and Dalgety Uplands sections of the Snowy River. Data from the release were compared with that of a natural flood event that occurred after the experimental flow event. Both events showed channel adjustments and a degree of geomorphic recovery, but this varied between the two river sections. Marked channel adjustments occurred in the Dalgety Uplands reach following both the experimental and natural flood event and in the Jindabyne Gorge section following the natural flood event. Geomorphic changes were related to the hydrological character of each flood event. The number of flood peaks, the sequence of peaks, the flood duration, and the total energy expenditure differed markedly between the two events, and these four flood hydrological characteristics explained the greater geomorphic recovery associated with the natural flood event in the Jindabyne Gorge. No clear hydro-geomorphic relationship was derived for channel change in the Dalgety Uplands where existing morphological constraints limit flood effectiveness.",
    keywords = "channel maintenance flows, conceptual model of channel adjustment, environmental flows, flushing flows, geomorphic recovery",
    author = "Teresa Rose and Wayne Erskine and Brett Miners",
    year = "2019",
    month = "8",
    day = "20",
    doi = "10.1002/rra.3452",
    language = "English",
    pages = "1--13",
    journal = "River Research and Applications",
    issn = "0886-9375",
    publisher = "John Wiley & Sons",

    }

    Channel recovery in a regulated river : Effects of an experimental and natural flood in the Snowy River, SE Australia. / Rose, Teresa; Erskine, Wayne; Miners, Brett.

    In: River Research and Applications, 20.08.2019, p. 1-13.

    Research output: Contribution to journalArticleResearchpeer-review

    TY - JOUR

    T1 - Channel recovery in a regulated river

    T2 - Effects of an experimental and natural flood in the Snowy River, SE Australia

    AU - Rose, Teresa

    AU - Erskine, Wayne

    AU - Miners, Brett

    PY - 2019/8/20

    Y1 - 2019/8/20

    N2 - Experimental floods, generated downstream of dams, are used to recover specific bio-geomorphic functions in regulated rivers. Studies of the effects of experimental floods vary in their objective, location, and the hydrological and bio-geomorphic variables used to quantify recovery. Measurements of geomorphic change are required to guide future release strategies. The focus of this study was to determine if a large experimental flood in the Snowy River Australia, could promote geomorphic recovery of the river channel downstream of Jindabyne Dam following 35 years of flow regulation. The objectives of the release were to deepen, widen, and increase channel capacity and coarsen the riverbed substratum in the Jindabyne Gorge and Dalgety Uplands sections of the Snowy River. Data from the release were compared with that of a natural flood event that occurred after the experimental flow event. Both events showed channel adjustments and a degree of geomorphic recovery, but this varied between the two river sections. Marked channel adjustments occurred in the Dalgety Uplands reach following both the experimental and natural flood event and in the Jindabyne Gorge section following the natural flood event. Geomorphic changes were related to the hydrological character of each flood event. The number of flood peaks, the sequence of peaks, the flood duration, and the total energy expenditure differed markedly between the two events, and these four flood hydrological characteristics explained the greater geomorphic recovery associated with the natural flood event in the Jindabyne Gorge. No clear hydro-geomorphic relationship was derived for channel change in the Dalgety Uplands where existing morphological constraints limit flood effectiveness.

    AB - Experimental floods, generated downstream of dams, are used to recover specific bio-geomorphic functions in regulated rivers. Studies of the effects of experimental floods vary in their objective, location, and the hydrological and bio-geomorphic variables used to quantify recovery. Measurements of geomorphic change are required to guide future release strategies. The focus of this study was to determine if a large experimental flood in the Snowy River Australia, could promote geomorphic recovery of the river channel downstream of Jindabyne Dam following 35 years of flow regulation. The objectives of the release were to deepen, widen, and increase channel capacity and coarsen the riverbed substratum in the Jindabyne Gorge and Dalgety Uplands sections of the Snowy River. Data from the release were compared with that of a natural flood event that occurred after the experimental flow event. Both events showed channel adjustments and a degree of geomorphic recovery, but this varied between the two river sections. Marked channel adjustments occurred in the Dalgety Uplands reach following both the experimental and natural flood event and in the Jindabyne Gorge section following the natural flood event. Geomorphic changes were related to the hydrological character of each flood event. The number of flood peaks, the sequence of peaks, the flood duration, and the total energy expenditure differed markedly between the two events, and these four flood hydrological characteristics explained the greater geomorphic recovery associated with the natural flood event in the Jindabyne Gorge. No clear hydro-geomorphic relationship was derived for channel change in the Dalgety Uplands where existing morphological constraints limit flood effectiveness.

    KW - channel maintenance flows

    KW - conceptual model of channel adjustment

    KW - environmental flows

    KW - flushing flows

    KW - geomorphic recovery

    UR - http://www.scopus.com/inward/record.url?scp=85070865315&partnerID=8YFLogxK

    U2 - 10.1002/rra.3452

    DO - 10.1002/rra.3452

    M3 - Article

    SP - 1

    EP - 13

    JO - River Research and Applications

    JF - River Research and Applications

    SN - 0886-9375

    ER -