Inhydrology, adebouch (ordebouche) is a place whererunoff from a small, confined spacedischarges into a larger, broaderbody of water. The word is derived from the French verbdéboucher (French:[debuʃe]), which means "to unblock, to clear". The term also has a military usage.[1]
In fluvial geomorphology, a debouch is a place where 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 massive amounts of sediment transport. When a narrow stream travels down a mountain pass into a basin, analluvial fan will form from the mass deposit of the sediment. The four largest rivers (theAmazon, theGanges, theYangtze and theYellow) are responsible for 20% of the global discharge of sediment in to the oceans by debouches.[2]
Influvialgeography, a debouch is a place where a body of water pours forth from a narrow opening. Some examples are: where ariver orstream emerges from a narrow constraininglandform, such as adefile, into open country or a wider space; acreek joins ariver; or a stream flows into a lake.[3]
Inmilitary usage of debouch: as a noun, afortification at the end of adefile is sometimes known as a debouch; and as a verb, soldiers emerging from a narrow space and spreading out are also said to "debouch".[4]
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