Backfilling of trenches exposed to waves

Jacob Hjelmager Jensen, Jørgen Fredsøe

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    Abstract

    This paper treats the numerical prediction of initial and long-term morphology of small pipeline trenches. For this purpose a refined flow and sediment transport description is applied such that the entire mathematical problem is formulated and solved on a curvilinear grid using a k - ε turbulence-closure. The backfilling process of trenches exposed to either waves or a steady current is of importance in relation to the implementation of pipelines in the marine environment. With respect to the sedimentation of trenches, the non-dimensional Trench-Keulegan-Carpenter number, KC = a/L, where a is the excursion length of a particle in waves and L the trench length, is investigated in detail, and an optimal KC-number for the backfilling rate is found. Coherent structures in the non-uniform unsteady trench-flow are shown to dominate the deposition rate when present. The importance of a detailed description of the flow is further justified by comparing predictions of a very simple flow-model neglecting convective terms with the sophisticated flow-model.
    Original languageEnglish
    JournalProceedings of the Coastal Engineering Conference
    Volume3
    Pages (from-to)3231-3243
    ISSN0893-8717
    Publication statusPublished - 1997
    Event25th International Conference on Coastal Engineering - Peabody Hotel, Orlando, FL, United States
    Duration: 2 Sep 19966 Sep 1996
    Conference number: 25
    http://www.coastal.udel.edu/icce96.html

    Conference

    Conference25th International Conference on Coastal Engineering
    Number25
    LocationPeabody Hotel
    CountryUnited States
    CityOrlando, FL
    Period02/09/199606/09/1996
    Internet address

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