Mountain Stream • Steep Gradient • Erodes Into Bedrock

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mountain stream • steep gradient • erodes into bedrock braided stream: • high gradient stream • multiple channels • channels cover entire floodplain meandering stream: • low gradient stream • single channel • steep cut bank on outside and gently point bar on inside of meander delta: • top at sea level • distributary channels Steep gradient mountain • erode into bedrock • no sediment deposited talus slope: • uphill from mountain stream • coarse angular sediment moves downward by gravity on slopes steepened by erosion at the base alluvial fan: • mountain stream enters trunk valley • coarse sediment is deposited where the stream slows down alluvial fan: fan shape created by channel swapping braided stream: multiple channels and bars as competence increases sandy floodplain is easily eroded braided stream: • pebbles and sand is deposited on both the floodplain and channel • sand and mud is transported downstream meandering stream: Single asymmetrical channel Cut bank on the outside of a meander Point bar on the inside of a meander meandering stream: • sand and mud are transported in the channel • mud is deposited on the floodplain as a flood wanes Indus delta tide dominated Mississippi delta Nile delta river dominated wave dominated No sediment: eroding into bedrock talus slope: • unbedded • boulders or cobbles • angular • poorly sorted • rock fragments alluvial fan: • bedded • cobble, pebble, sand • somewhat rounded • poorly sorted • rock and mineral fragments braided stream: • bedded • pebble, sand • moderately rounded • moderately sorted • rock and mineral fragments meandering stream: • interlayered • well-bedded sand and mud • well sorted • well rounded • mineral fragments delta: • topset • foreset • bottomset • mud .

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