HYDRAULIC STABILITY OF A VERY NARROW NAVIGATION CHANNEL

摘要

Movement of navigation traffic (ship, vessel, barge,... etc.) in restricted water ways such as rivers and navigation channels can generate rapid return flow and water-level depression (drawdown) between the ship and shoreline. Accordingly, the ambient velocity distribution changes in the zone in time and space. Many researchers have developed methods to compute the return flow velocity on the basis of one-dimensional conservation of mass, momentum, or energy. Some have discussed methods of computing the return-velocity distribution across the channel. The objective of this study is to get the effect of various parameters of the ship (width, length, draft, and speed) and water depth on the return flow velocity and drawdown in a very narrow navigation channel both experimentally and analytically. A simple method is presented to predict the average return flow velocity and drawdown between the ship and the sidewall with experimental verification. The linear model of Mei is also applied to predict the water surface profile around the ship.