| What is a Drainage basin/water shed/cathment area/opland | where the water comes from. |
| In a stream what are riffles, pools, run and neander? | Riffle: fast running water
Pools: after riffle slow
Run: inbetween pool and riffle - intermediate speed.
Same amount of water needs to go through pool, riffle and run so where area is going down the velocity (speed) is going up.
Buerne her nede hedder gamle neanderbuer. |
| How are riffles and pools created?
When is the difference between riffle and pool smalles? | Riffles and pools are created during high flows.
During high flow the highest velocity will be in the pool areas because of less friction and rocks and such are placced in riffle areas.
during low flows velocity will be higher in the riffles.
So in high flow the difference between riffle and pool is smaller |
| Explain briefly when tramsportation and sedimentation occurs | Fine particles are moved in high or moderate velocity.
big sediment will only move in much higher velocity.
So from the sediment you can say a lot about the velocity.
Erosion requires more energy than transport. |
| What are some consequences of adding drainage pipes to a stream? | Drainage pipe: affects hydrology and transports a lot of sediment to the stream. Can homogenize habitats by adding a lot of fine sediment. |
| If you start at the top of the stream and go to the botttom when will erosion, transfer and deposition occur? | Threee zones:
Headwater: erosional area because of high velocity
Transfer zone: high enough to transfer but not to erode
Depositional zone - close to the sea. Velocity is low due to decline in slope and a lot of sediment is deposited here. |
| What are neanders and how are they created? | Neander (sving). The small søer are neanders that are cut off.
Because of erosian a natural floodplain will look like this. But many dont because we have restricted moovement. |
| What is the diffusive boundry layer? | Difusive boundry layer is important for organisms in both still and flowing water
Difussive boundry layer - layers where water is not running. Sollutes and gasses are mooved by difussion over this boundry layer.
Higher velocity = lower boundry layer. |
| Forklar denne figur | Fatter den ikke helt overhovedet faktisk men det virker som om den er ok vigtig |
