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.
|Journal||Proceedings of the Coastal Engineering Conference|
|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
|Conference||25th International Conference on Coastal Engineering|
|Period||02/09/1996 → 06/09/1996|