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exam 3--online
11
| Question | Answer |
|---|---|
| What separates one drainage basin from another? | high ground |
| What is the relationship between stream gradient and average stream velocity? | stream gradient decreases while stream velocity increase down stream |
| What is the correct order for where you would find stream deposits starting at the headwaters and going toward the mouth? | gravel, sand, silt |
| The smaller the wetted perimeter... | the faster the velocity |
| What happens to the wetted perimeter of a stream during a flood? | it increases |
| A rapidly city within a humid climate zone experiences a land use change from perdomintly cropland to mostly urban/suburban. A likely natural response would be: | reduced infiltration--increased floodingg |
| What is the longest river on earth? | nile |
| Where is the majority of the earths water? | oceans |
| Where does most evaporation of moisture to the atmosphere occur? | from the oceans |
| What happens to most of the water falling as precipitation? | it returns to the atmosphere by evaporation and transpiration |
| what is ultimate base level for most streams? | an ocean |
| Besides the average precipitation, what determines the size of a stream? | the drainage basin size |
| Which type of stream pattern is similar to the pattern formed by tree branches? | dendritic |
| Where is stream gradient usually greatest? | headwaters |
| What type of load are you observing when you see a muddy stream? | suspended load |
| Where are streams most common and why? | southeast US, greatest rainfall |
| How is stream discharge determined? | depth x width x velocity |
| What is closely related to stream "stage"? | depth |
| What is the average period of time that elapses between flood events of similar size? | recurrence interval |
| What factor causes the majority of flooding most Midwestern rivers (ohio river)? | brief, heavy storms |
| Daily stream discharge rates are displayed on these plots | hydrographs |
| A stream with a rectangular cross section has a width of 10 ft and an average depth of 3 feet. The velocity of the water flowing through this segment of the stream is 2 ft per second. What is the discharge of the stream? | 15 ft3/second |
| What factors incluence the way rivers flow? | -the underlying geologic structure of faults and or folds -the speed with which the water is flowing -dams along a stream channel -the resistance to erosion of the materials that make up the channel |
| A point bar forms due to | river flow slowing down on the side of meander bends, depositing sediments |
| A cut bank forms due to | river flow speeding up on the outside of meander beds eroding sediments |
| A levee forms due to | river flow velocity decreases, depositing sediments near the channel margins as water spreads out over a floodplain during a flood |
| oxbow lake forms due to | as rivers cut off segments of their channel creating curvy looking lakes |
| The most common type of drainage basin pattern is____and it is usually associated with____ | dendritic, horizontal sedimentary rocks or sediments |
Created by:
cbalaban