1. Particle Deposition
Created By;
Mr. Kreeger

2. Table of Contents Settling Rate Factors affect settling rate
Size
Shape
Density
Settling Rate vs. Settling time
Sorting of deposited materials
Horizontal
Vertical

3. Settling Rate
The Speed at which a particle will settle to the bottom of a body of water (Deposition)

4. Factors Affecting Settling Rate
Size- The smaller the particle the slower it will take to settle the larger the particle the faster it will take to settle out.
Shape- Rounder settle faster more angular settle slower

5. Hydrodynamic particles (round) settle faster than flat or irregular shaped particles

6. Factors Affecting Settling Rate cont.
Density- Denser particles settle faster

7. Settling Rate vs. Settling Time
There is an inverse (indirect) relationship between settling rate and settling time. Think about it, sediments that settle at a faster rate (rate increases) require less time to settle (time decreases)
Time to settle (sec)
Settling Rate (cm/sec)
Remember what the graph of an inverse relationship looks like…

8. Sorting of deposited Sediment
Horizontal sorting The sediments that were once carried down the stream are arranged from largest to smallest.

9. More Horizontal Sorting

11. Sorting of deposited Sediment
Vertical Sorting
Happens in QUIET WATER (still – lake, pond)
Particles sort out from bottom to top in layers
On bottom – largest, roundest, densest particles
On top – smallest, flattest, least dense particles
Can occur when a depositional event, like a landslide, dumps a large volume of unsorted sediments into a still body of water like a lake
It creates “graded beds” of sediments

12. Vertical Sorting: Graded Bedding
One depositional event
One depositional event