Earth Sciences 1089F/G Lecture Notes - Downcutting, Bed Load, Clastic Rock

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2:59 pm: streams as part of the earth system, excess water that doesn"t soak into the earth becomes runoff, collects into channels. Why are rivers important: delivers water from land to sea. This is called sheetflow: the rills merge into stream channels which can then turn into rivers. If the walls aren"t stable sediment can fall into the stream: rapid downcutting can produce super deep valleys that are v- shaped, some valleys have lots of meandering (snaky pattern). Instead of downcutting, they go back and forth. This happens because the gradient is not very steep. The flood plane is the blanket of sediment that settles when there is excess water in the stream due to a sort of little "lake" that"s formed from the extra water. Every stream/river will flood at some point: the middle of the river isn"t necessarily the fastest!

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