| 单词 |
panplain |
| 释义 |
panplain Physical Geogr.|ˈpænpleɪn|
Also -plane.
[f. pan- + plain n.1]
A plain formed by the coalescence of previously separate flood-plains.
1933C. H. Crickmay in Geol. Mag. LXX. 345 We would expect the growing floodplains to become confluent, making one broad universal plain shared by all the streams of the region. The surface will be flat, and will have a general slope like that which now characterizes the lower floodplains of great rivers. The only relief will be remnants of some of the interfluves which may persist as low monadnocks. This plain, formed of floodplains joined by their own growth, may be called a panplain. 1942O. D. von Engeln Geomorphol. vi. 97 Eventually the level surfaces of adjacent stream floors, concurrently developed by such planation, become confluent and a panplane, a very level plain with a general downward inclination, is produced. 1960B. W. Sparks Geomorphol. xv. 340 There seems little doubt that river planation is an important agency of erosion,..but whether these can extend indefinitely to form a panplain seems more doubtful. 1967J. Hays in Jennings & Mabbutt Landform Stud. Austral. & New Guinea ix. 200 Near Darwin, the panplains of north-flowing and west-flowing streams have coalesced. |
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