ForsideBøgerA Treatise On The Princip… Of Harbour Engineering

A Treatise On The Principles And Practice Of Harbour Engineering

Forfatter: Brysson Cunningham

År: 1908

Forlag: Charles Griffin & Company

Sted: London

Sider: 410

UDK: Vandbygningssamlingen 134.16

With18 Plates And 220 Illustrations In The Text

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Side af 416 Forrige Næste
HARBOUR DESIGN. 39 “ Defects of the present harbour : (1) The shoal depth, narrow breadth, and irregular course of the entrance channel. “At low water, the depth of the channel between the pierheads is about 2 feet, and from the pierheads to the harbour quays it averages only about 1 foot. This shallow depth causes detention to the largest class of herring- boats of from 2-^ to 5 hours, which greatly diminishes the value of the fish, particularly in hot weather. “The breadth of the channel varies from 50 to 80 feet. Its course, instead of being midway between the piers, is close to the outer arm of the east pier, and at the inner end of that arm it takes a sharp bend. But the most dangerous feature is the sand-bar just outside of the pierheads, which dries several feet at low water, and which, owing to wave action from pre- vailing northerly winds combined with the flood-tide, is continually tending to close the entrance channel, and, at times of drought in the river, does so. “ Upon this bar, during storms, seas break so heavily that it is impossible for boats either to enter or leave the harbour, and this is also the case for some time before and after low water, even during moderate gales. “ (2) The range of waves into the harbour. This is so great, that even during slight gales boats cannot lie in the outer harbour, and are obliged to go above the bridge for safety. “ Proposed Works of Improuement.—The following works are the least which it would be necessary to uudertake in order to remedy the defects enumerated, and to render Whitby an efficient fishing port: “ (1) Two new piers extending from the present pierheads to a permanent sea depth of 7 feet at low water. “The necessity for such piers is, first, to enable that depth of water to be