Lab: How does sediment size, shape and density affect its deposition? 12-17-09 Topic: Deposition DN: 1. At which two points will erosion occur? 2. At which two points will deposition occur? 3. At which two points is the stream moving the fastest?

Lab Introduction: Factors Affecting Deposition: 1. How does particle size affect the rate of deposition? 2. How does the particle shape affect the rate of deposition? 3. How does density affect the rate of deposition? How do we average data? How do we zero-out the electronic scales? How can we verify the correct units are being used on the scales? How do we calculate settling rates?

Factors that affect DEPOSITION Particle Size: smaller = slower Particle Shape: more surface area = slower Particle Density: similar size, >D = faster 

Sorting of Sediments Vertical Sorting: the roundest, largest, and densest particles settle at the bottom of a layer, while flatter, smaller, less dense particles settle on the top (landslide, underwater landslides)

Verticle Sorting (a GRADED BED) Decreasing size Decreasing size