http://worldcat.org/entity/work/id/15480722

Gallipolis Lock intake vortex study, Ohio River : hydraulic model investigation

The existing Gallipolis Locks are located on the Ohio River at mile 279.2. Because of their location on an inside bend, the orientation for approach channels, velocity currents in the river, and the design of the approach walls, entry of downbound tows into the lock is hazardous and time consuming during periods of high flow. As a result of increasing traffic and tow sizes, these locks have become a serious problem to vessel movement along the Ohio River. Replacement locks will be constructed in the near future to alleviate these problems. Tests were conducted on a 1:25-scale model that reproduced 2,500 ft of the Ohio River beginning 188 ft upstream of the existing lock guide wall. Approximately 250 ft of the width of the river was reproduced. This model was used to evaluate the performance of the intake structures for the new locks. Two different alternate plans for the filling of the locks were tested. One plan consisted of filling the lock through long culverts extending from the river to the lock chamber. The other plan consisted of an intake canal extending from the river to the guide wall. Two intakes were located on the riverward side of the new lock approach wall, and one intake was located in the filling canal. Air-entraining vortices developed at the intake structure in both plans. The air-entraining vortices observed in both plans were eliminated by modification to the intake structure.

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