| 单词 |
ponor |
| 释义 |
ponor Physical Geogr.|ˈpəʊnə(r)|
[Serbo-Croat.]
A steep natural shaft leading from the surface of the ground in a karstic region.
[1921Geogr. Rev. XI. 593 The article of Professor Cvijić marks a step forward in the science of physiography; but it is far from easy reading for the average geographer since many unfamiliar terms, such as ‘bogaz’ and ‘ponor’ are used without either definition or explanation by synonyms. Ibid. 600 The shaftlike aperture Cvijić called ‘ponor’.] 1922Geol. Mag. XIX. 406 The funnel-shaped hollows which are so frequently met with on the surface of the karst are termed ponors. 1937Wooldridge & Morgan Physical Basis Geogr. xix. 290 They [sc. limestone caves] commonly form part of a complex system of channels, widening locally into chambers, and fall broadly into two sets, viz. roughly horizontal galleries, and vertical or steeply inclined shafts, of which the higher members are the ‘ponors’ communicating with the surface. 1971J. N. Jennings Karst vi. 139 In some poljes certain ponors change function for a period in the wet season and spew out water. 1976S. T. Trudgill in E. Derbyshire Geomorphol. & Climate iii. 92 They observed in the Kuh-E-Parau limestone area of Iran how the overall form on a large scale is solutional in origin, with rounded hills, dolines and ponors. |
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