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 language | English |
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Journal | Proceedings of the Coastal Engineering Conference |
Volume | 3 |
Pages (from-to) | 3231-3243 |
ISSN | 0893-8717 |
Publication status | Published - 1997 |
Event | 25th International Conference on Coastal Engineering - Peabody Hotel, Orlando, FL, United States Duration: 2 Sep 1996 → 6 Sep 1996 Conference number: 25 http://www.coastal.udel.edu/icce96.html |
Conference
Conference | 25th International Conference on Coastal Engineering |
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Number | 25 |
Location | Peabody Hotel |
Country/Territory | United States |
City | Orlando, FL |
Period | 02/09/1996 → 06/09/1996 |
Internet address |