Development of the Brake Bank

Neither the Querns nor the Cross Ledge are sandbanks in the proper sense, since it seems probable that they are chalk outcrops with an occasional sand capping. The analysis which follows is based on an examination of the shape of the submarine features in question. Knowledge of the shape is derived from hydrographic surveys. Unfortunately these surveys do not necessarily show the limits of that part of a sand? bank which is subject to movement, but only the contours of the sea floor surface. Therefore, as the bank moves over an uneven base, it is generally impossible to measure the total volume of sediment which has moved, or whether the volume of sand in the bank has either increased or decreased. As the sand moves across an area, such as the Cross Ledge, no allowance can be made for it, especially since hydrographic surveys tend to cover a particular shoal feature rather than a particular geographical area. The bank successively covers a different part of the hidden subsurface, and though it is possible to give an approximation of this subsurface, there is no means of charting it with sufficient accuracy. The component features of the Brake will be examined either at the 1- or the 2fathomline level, whichever best shows their separate identity. It is not implied that either one or other level is to be taken as the depth limit of the sediment of that particu? lar feature. It is merely an expedient which allows one to dissect an otherwise bewildering complexity, and expose the component parts more clearly

Brake · Business · Automotive Engineering · Engineering · Geological formations and processes · Geological Modeling and Analysis · Marine and environmental studies

• The Hydrography of Start Bay and Its Relationship to Beach Changes at Hallsands

  A H W Robinson•Geographical Journal•1961

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• Hydrographic Analysis of the Goodwin Sands and the Brake Bank

  R L Cloet•Geographical Journal•1954

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