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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Discrete debris accumulation ： ウィキペディア英語版 Discrete debris accumulation Discrete debris accumulation (DDA) is a non-genetic term in mountain glacial geology to aid identification of non-lithified sediments on a valley or mountain slope or floor. It is intended that the debris accumulation is discrete such that it can be mapped, in the field and/or from aerial or satellite imagery. The origin or formative process may well not be known clearly or be changed by subsequent investigators it is advisable to have a non-genetic field reference so that discussion can then be used to ascertain, if possible, the origin. Mountain areas may currently have glaciers (glacierized) or have had glaciers (glaciated) or be subject to forms of periglacial activity. A moraine would be an easily identified DDA as would an esker. Although scree (talus) is generally easily identified and mapped, these deposits may be modified by ice, avalanches or downlope movement to create essentially new landforms. Many small slope failures and landslides can give the appearance of moraines or protalus ramparts on slopes. After mapping as a DDA, further investigation might draw light on the origin of the feature. The term was apparently first used by Lukas 〔Lukas, Sven Nicholson, Lindsey I, Ross, Fionna H, Humlum, Ole. Formation, meltout processes and landscape alteration of high-Arctic ice-cored moraines—Examples from Nordenskiold Land, central Spitsbergen, Polar Geography, 29/3, 2005〕 for a very specific feature in Svalbard. Independently, it was suggested in the literature in Whalley 〔Whalley, W.B. . On the interpretation of discrete debris accumulations associated with glaciers with special reference to the British Isles. In: Periglacial and Paraglacial Processes and Environments, edited by J. Knight and S. Harrison, 85-102. London: Geological Society of London Special Publication 320. 2009〕 and subsequently in Whalley, 2012〔Whalley, W.B. Using Discrete Debris Accumulations to Help Interpret Upland Glaciation of the Younger Dryas in the British Isles, Chapter 1, In: Studies on Environmental and Applied Geomorphology. Eds, Piacentini, T. Miccadei, E. InTech Europe, ISBN 978-953-51-0361-5, 2012.〕 as relating to the basic definition and usage as above. This book chapter provides several photographic examples. ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Discrete debris accumulation」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.