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Перевод: aggradation

береговые отложения

Тезаурус:

1. Unfortunately the rivers, meandering over their own aggradation, may be expected to produce comparable cliffing where they impinge against the solid rocks of the valley sides, so that, in practice, an interpretation of events based solely on the evidence of landforms is not practicable.
2. The aggradation in the lower reaches of these rivers results in a landform with all the appearance of a true floodplain, a broad tract of easily flooded land over which the river flows in sweeping meanders, or did so until their courses were artificially contained in the interests of navigation and flood control.
3. Some deltas are virtually continuations of the aggradation type of river floodplain (see Chapter 9).
4. The simple association of degradation and aggradation of beaches with wave type needs some modification.
5. This, incidentally, throws some doubt on the efficacy In addition to the aggradation of the lower reaches of river valleys, the Post-glacial rise of sea level caused widespread aggradation of any lowlands which had been eroded to a sufficiently low level.
6. In areas of readily eroded rocks the rivers may carry so much load that one of two things may happen: either the estuary may be filled soon after it is formed or the aggradation may keep pace with the rising sea level so that there is not a stage of actual ria or estuary formation.
7. The reasons are the same; the valleyside torrents are checked when they reach the main valley floor and aggradation takes place, the fan shape usually resulting from the stream shifting its course from time to time.
8. Such detailed analyses of aggradation deposits as this are not possible by purely geomorphological methods, but require considerations of stratigraphy and especially of fossils.
9. The outstanding example of such aggradation in the British Isles is provided by the Fenland.
10. The interpretation of the sequence of events involved in the aggradation is one in which the geomorphologist has usually insufficient specialised knowledge, as the phases of marine and river aggradation are represented by different types of alluvium with differing fossil contents.
11. Indeed, it may be true that most of the great floodplains of the world have been formed by aggradation provoked by the Post-glacial rise in sea level and not by the erosional method outlined in the discussion of the Davisian cycle (Chapter 2).