によって Rachel Chan 5年前.
128
もっと見る
drainage basin/watershed = all the land that drains into the river either directly or through its tributes - largest in U.S. --> Mississippi River System
Divide = high point separating drainage basins - Ex: Continental Divide (Rocky Mountain) is major divide in U.S.
"Load" = minerals transported down-stream transported 3 ways: 1. Solution (dissolved) 2. Suspension (floating) 3. bed load (along bottom) roll slide bounce
2 Measurements Used to Describe Ability to Erode Materials: 1. Complete maximum size of particles stream can carry 2. Capacity total amount of sediment stream can carry
Factors That Affect the Complete & Capacity of a Stream? 1. Velocity directly related to competence 2. Discharge directly related to capacity
Velocity = distance water travels in a given amount of time - affected by amount of energy a stream has due to: 1. gradient (slope/steepness) 2. discharge (amt of water) 3. channel (path) size (width & depth) shape of the path (straight, curved) - faster velocity = larger particles carried (greater competence)
**See velocity Tree Map**
Sediments: - pitted - scratched - frosted exhibit ventifaction - (wind-warn flat surfaces are sorted
Features: - sand dunes - gentle slope faces direction wind comes from
factors affected by: - slope - amount of water in soil - bedrock composition & structure
