Stream Processes

Stream Processes - Stream Processes Stream The water in all...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Stream Processes Stream The water in all streams, large or small, The can flow in two ways: can a) Laminar flow – The simplest type of flow. Streamlines do not cross, typically seen in slow moving waters slow b) Turbulent flow – Complex flow pattern in which streamlines cross and form eddies. Typically seen in fast moving streams Typically Streams transport a variety of sediment as Streams either suspended load or bed load suspended bed Most sand grains within a stream are Most transported by the process of saltation. This saltation This is the intermittent jumping of particles, and the smaller the particle, the higher it jumps and the farther it travels and Experimental work has shown that there is a Experimental relationship between the velocity of a stream and the size of particles it can erode, transport, and deposit. This is called Hjulstrom’s curve The term stream valley encompasses both The valley the actual stream channel and its floodplain channel floodplain The two main types of stream channel The patterns are braided and meandering braided meandering 1) Braided streams are characterized by • • • • High sediment load Variable discharge High gradient Relatively young in age 2) Meandering streams are characterized by: 2) • • • • Low Sediment Load Low Gradient Meanders change shape Old, mature stream Over time meanders change shape because Over on the cut bank side sediment is being eroded and along the point bar side deposition is occurring deposition As streams flood natural levees are built up. As natural Sometimes the levees build up so high that the floodplain level is below the stream level floodplain The longitudinal profile of a stream is The longitudinal generally always concave upward, with the steepest section being near the streams head, and leveling out near the mouth head and mouth A delta is a fan shaped body of sediment delta that gets deposited at the mouth of a stream entering an ocean or lake. As the stream enters a standing body of water, deposition of the coarsest sediment occurs first of Over time deltas build forward, and Over occasionally the main channel will shift to distributaries with shorter routes. This has occurred several times along the Mississippi delta delta Alluvial fans are similar to deltas in that Alluvial they are fan shaped and formed from the sudden deposition of material, but alluvial fans are located at mountain fronts fans Putting it all together ...
View Full Document

This note was uploaded on 10/23/2011 for the course GLY 1000 taught by Professor Parker during the Spring '11 term at FSU.

Ask a homework question - tutors are online