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Bedform
A bedform is a feature that develops at the interface of fluid and a moveable bed, the result of bed material being moved by fluid flow. Examples include ripples and dunes on the bed of a river. Bedforms are often preserved in the rock record as a result of being present in a depositional setting. Bedforms are often characteristic to the flow parameters, and may be used to infer flow depth and velocity, and therefore the Froude number.
==Bedforms Initiation==
Bedforms are omnipresent in many environments (e.g., fluvial, eolian, glaciofluvial, deltaic and deep sea), although there is still some debate on how they develop. The initiation of bedforms have two - not mutually exclusive - models: defect initiation and instantaneous initiation.
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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