The Sea-coast: 1. Destruction, 2. Littoral Drift, 3. ProtectionLongmans, Green, 1902 - 361 páginas |
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Página 9
... lower portion , or the trough , moving downwards and backwards . The maximum horizontal motion takes place at the top of the crest and bottom of the trough , and is at zero at the centre of the undulation , where the motion is only ...
... lower portion , or the trough , moving downwards and backwards . The maximum horizontal motion takes place at the top of the crest and bottom of the trough , and is at zero at the centre of the undulation , where the motion is only ...
Página 11
... lower molecules of the water is changed into a horizontal one , independent of the undulatory movement . of the upper part of the wave ; and that where the bed of the sea rises abruptly this horizontal or translatory movement ...
... lower molecules of the water is changed into a horizontal one , independent of the undulatory movement . of the upper part of the wave ; and that where the bed of the sea rises abruptly this horizontal or translatory movement ...
Página 19
... lower result than that shown by the above calculation . With waves 10 feet high , the mean pressure recorded was 1.36 ton per square foot , or about one - third of that given . Experiments carried out with a dynamometer by Mr. Frank ...
... lower result than that shown by the above calculation . With waves 10 feet high , the mean pressure recorded was 1.36 ton per square foot , or about one - third of that given . Experiments carried out with a dynamometer by Mr. Frank ...
Página 36
... lower part of the wave striking the bank , curling round and cutting out a hollow in its face . Two such hollows will almost invariably be found in all shingle banks , one at the level of high , and the other at that of ordinary ...
... lower part of the wave striking the bank , curling round and cutting out a hollow in its face . Two such hollows will almost invariably be found in all shingle banks , one at the level of high , and the other at that of ordinary ...
Página 37
... lower part of the wave curls round and cuts out the hollow already described . A great part of the water soaks in amongst the interstices of the pebbles , and drains gradually down to the beach , so that the quantity of water in the ...
... lower part of the wave curls round and cuts out the hollow already described . A great part of the water soaks in amongst the interstices of the pebbles , and drains gradually down to the beach , so that the quantity of water in the ...
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Términos y frases comunes
12 feet 20 feet acres alluvium angle bank of shingle basalt beach in front beach material Blackpool boulder clay boulders Bridlington Burton Bradstock chalk chalk cliffs channel chert Clacton clay coast coast-line composed concrete considerable constructed denudation deposited depth derived direction distance dunes east eastward effect entrance erected erosion estuary extends face fathoms feet high Felixstowe flints flood tide foot gravel groynes half a mile harbour headland heavy gales height high tides high water Humber inches in diameter inland jetty Kilnsea land length limestone littoral drift low groynes low water marshes mile wide on-shore gales particles pebbles pier piles placed planking promenade protection quantity quartzite rise river rocks sand and shingle sand-hills sandstone sandy beach sea-wall seaward shingle and sand shingle-bank shore slope spit spring tides Spurn Point stones surface tidal timber varying wall washed waves breaking width wind Withernsea yards wide
Pasajes populares
Página 9 - Fall, as the crest of some slow-arching wave Heard in dead night along that tableshore Drops flat, and after the great waters break Whitening for half a league, and thin themselves Far over sands marbled with moon and cloud, From less and less to nothing...
Página 290 - Coffin, is an area about three-quarters of a mile long and a quarter of a mile wide, known as "Swampoodle...
Página 150 - Chisil is such, that as often as the wind bloweth strene, at south-est, so often the se betith it, and losith the bank, and breaketh it thorough it. So that if this might continually blow there, this bank should sone be beten away, and the se fully enter, and devide Portland making it an isle, as surely in tymes past it hath beene, as far as I can by any conjecture gather.
Página 13 - Society, 1834), and the statement has frequently been repeated, that with eight breakers a minute the effect on the beach is accumulative, but that with ten breakers a destructive action sets in. This rule, however, cannot be held to apply. The number of waves in a given period is an indication of their size, and fewer large waves break on a shore in a given time than small ones. With small waves the number frequently reaches from fifteen to twenty in a minute. As already stated, any disturbance...
Página 90 - ... to 1. Dry cohesive earth will stand at an angle of 45 degrees, or 1 to 1 ; some kind of wet clay is not to be depended on at an angle of about 18 degrees, or a slope of 3 to 1. The simplest formulae for ascertaining the horizontal pressure against a wall having a vertical back, where P = pressure, W = weight of earth, taken at 112 Ibs. the cubic foot, H = height of wall exposed above the surface of ground, Q = the natural angle of repose of the earth at the back of the wall, are — (1) For mud-pressure,...
Página 98 - The wall is 3J/2 miles long, 16 feet wide at the base and 5 feet at the top, which is 17 feet above low tide. The base is protected by granite blocks, extending out 27 feet into the Gulf. The concrete wall is reinforced by steel rods 9 feet long, set obliquely. In the construction of this sea wall, 150,000 tons of concrete, containing over 140,000 barrels of cement, were used...
Página 3 - ... no subject is entitled to destroy a natural barrier against the sea. And if the destruction of such natural barrier would cause an injury to a neighbouring landowner, he is entitled to an injunction to restrain it.
Página iv - ... to applications which their inventor would probably not have sanctioned. Mr. Wheeler does not himself, in the work before us, advocate any special system of groyning or coast-protection, but strives to afford such information as to the varying geological and tidal conditions attaching to sea-coasts, and the result of protective works carried out under different degrees of exposure, as may be of service to those having charge of protective works, or interested in the destruction and preservation...
Página 195 - In the middle of the last century an attempt was made to open out the west harbour, under the advice of Captain Perry.
Página 181 - ... notwithstanding that at certain times the tide rose nearly three feet higher on the west than on the east side of the bank, and in heavy gales the waves ran up the slope as much as ten feet vertically. The largest shingle was generally found