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Debouch
Debouch from French origin meaning to cause to emerge and is a term used in river, stream and glacier geography. The term also has a military usage. The word may also be spelled debouche.
==Geology==
In fluvial geomorphology a debouch is when runoff from a small, confined space emerges into a larger, broader space. Common examples are when a stream runs into a river or when a river runs into an ocean. Debouching can generate mass amounts of sediment transport. When a narrow stream travels down a mountain pass into a basin, for example, an alluvial fan will form from the mass deposit of the sediment. The four largest rivers (the Amazon, the Ganges-Brahmaputra, the Yangtze and the Yellow) are responsible for 20% of the global discharge of sediment in to the oceans via debouches.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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