| 单词 | point bar |
| 释义 | > as lemmaspoint bar point bar n. (a) Weaving (in the Jacquard apparatus) one of the needles governing the warp-threads, by the motion of which the pattern is produced; (b) Physical Geography an alluvial deposit that forms by accretion inside the loop of a river as the loop expands outwards, usually consisting of low, curved, parallel ridges. ΘΚΠ the world > the earth > structure of the earth > structural features > deposited by water, ice, or wind > [noun] > by water roddon1857 platform-mud1863 cone1864 fan1864 levee1870 alluvial fan1873 apron1889 sand-wash1901 scroll1902 spillbank1909 sheet-flow1928 point bar1945 the world > the earth > land > land mass > shore or bank > bank > [noun] > of river > scroll scroll1902 point bar1945 1815 J. Blackner Hist. Nottingham 230 By means of an additional rack handle, the point bar is moved to and fro, to enable the workman to apply the point to this or that needle. 1836 A. Ure Cotton Manuf. Great Brit. II. 350 Projects of bobbins, pushers, lockers, point-bars, and needles. 1945 H. N. Fisk in Geol. Investig. Alluvial Valley of Lower Mississippi River (U.S. Mississippi River Commission) 20 The point bar, the composite accretion within a bend, consists of an alternation of sand bar ridges, capped with thin top-stratum, and swales underlain by clay plugs. 1969 D. E. Varley J. Heathcoat 8 Thomas Frost..made a net in 1794 by means of a warp, square bobbins and point bars. 1995 A. M. Cvancara Field Man. Amateur Geologist (rev. ed.) ii. 12 Lower velocity on the inside causes the laying down or deposition of sediment in arclike ridges or point bars at the point of the meander. < as lemmas |
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