Modeling Surges in Navigation Lock Approaches
ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS COASTAL AND HYDRAULICS LAB
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PURPOSE The purpose of this Technical Note is to provide basic information regarding the modeling of surges generated during the operation of navigation locks. Accurate modeling of the time varying water-surface slopes is needed to estimate forces exerted on barge trains moored in the lock approaches. INTRODUCTION The operation of locks in navigation channels produces surges that can generate forces on moored vessels and lock gates. Wave heights may overtop walls and drawdown may produce insufficient navigation depth. Analyzing surges is difficult with existing analytical technologies and one-dimensional models because minor changes in canal cross section produce partial reflections. The effect of channel planform irregularities is difficult to quantify and lends itself to a two-dimensional 2D model capable of resolving these boundary shapes. Vessel transit time through a project can be reduced if the tow is allowed to moor in the immediate lock approach during lock chamber operations. Also, the construction of new locks in the vicinity of existing projects may be constrained due to surges produced from normal operation of the existing lock. A limit on allowable lock operation time may be required during construction periods. Surges resulting from the emptying of the proposed New Kentucky Lock are modeled as a demonstration of the capability of a 2D model to capture the rapidly varying waves and currents in the lower approach during lock emptying operations.
- Civil Engineering
- Land and Riverine Navigation and Guidance