| 释义 |
ria Geol.|ˈriːə|
[a. Sp. Adopted as a technical term in Ger. by F. von Richthofen Führer für Forschungsreisende (1886) ix. 309.]
1. A long narrow inlet of the sea formed by the partial submergence of an unglaciated river valley.
The wider use represented by quots. 1899, 1915 has not been generally adopted.
1898J. Geikie Earth Sculpture xvi. 289 Fiords, rias, and other indentations are simply submerged valleys. 1899Proc. Amer. Acad. Arts & Sci. XXXIV. 220 The term ria, from the Spanish, may be advantageously used to cover all types of subaerially carved troughs, including von Richthofen's fjord, ria, dalmatian, and limian types. 1915Ann. Assoc. Amer. Geographers V. 82 The Spanish word, ria, introduced into German by Richthofen, and now widely adopted, means any broad or estuarine river mouth, and not necessarily an embayment produced by the partial submergence of an open valley in a mountainous coast, in the sense that Richthofen originally proposed. 1939Geogr. Jrnl. XCIII. 235 Many of the rivers enter the heads of rias which extend many miles inland. 1946L. D. Stamp Britain's Struct. & Scenery v. 49 The best example of a coastline of drowned valleys or ria coast is the south-west of Ireland. Soundings show that the floor of the ria..slopes steadily seawards and there is no ‘lip’ as there is in the case of a glaciated valley. 1974Encycl. Brit. Micropædia IX. 560/2 Generally occurring along a rugged coast perpendicular to a mountain chain, many rias were formed by the rise in sea level after the melting of the vast continental glaciers. 1977Millward & Robinson Landscape of Brit. 46 In the South-West Peninsula, the deeply set valleys give rise to long branching arms of the sea known as ‘rias’.
2. attrib., as ria shoreline; ria coast (also † rias coast, after G. riasküste (von Richthofen, loc. cit.)), a coast marked by numerous rias.
1902Encycl. Brit. XXVIII. 623/1 A further subdivision depends on the character of the inter-relation of land and sea along the shore producing such types as a fjord-coast, ria-coast, or lagoon-coast. 1924tr. Wegener's Orig. Continents & Oceans 53 These strongly planed-down chains..stretch..westwards so as to form a wild jagged type of coast (the so-called rias-coast) in south-western Ireland and Brittany. 1946[see above]. 1977A. Hallam Planet Earth 94 For example, drowned river valleys of the ria coasts, such as those of southwest Ireland, can be differentiated from glacially eroded drowned coasts.
1919D. W. Johnson Shore Processes & Shoreline Devel. iv. 173 Shorelines formed by the partial submergence of a land mass dissected by normal river valleys, which may be called ria shorelines, after the ria coast of northwestern Spain..; thus used, the term ria is not restricted to the narrow meaning assigned to it by von Richthofen. |