| SCIENCE | MATTER | SOLAR SYSTEM | PLANETS | ATMOSPHERE | WIND and TEMPERATURE | HUMIDITY | WEATHERING | SOIL | SEASONS | MASS WASTING | SEASONS and CLIMATE | WIND WORK | STREAMS | LAND FORMS | GROUND WATER | CAVES/KARST | THE OCEAN | TIDES & ESTUARIES | WAVES | GLACIERS | GLACIAL LANDFORMS | VOLCANOES | VOLCANOES | CHON | PLATE TECHTONICS | EARTHQUAKES | ROCKS | CLIMATE CHANGE |
Stream - any sized channelized flow of water or the channel it flows in.
Things that control stream velocity
2. wetted perimeter - amount of channel the stream touches, the less the faster faster the stream velocity
3. smoothness - less friction, the smoother the channel the faster the stream velocity
4. discharge - the amount of water flowing, the more discharge the faster the stream velocity. Discharge equals the choss section of the stream at a point times the stream velocity (in the U.S, A. usually expressed in cubic feet)
Stream work is trying to make the Earth flat. As plate techtonics causes the land to rise, streams tend to cut it down.
Steps in stream work (close to identical to work done by wind)
3. deposition- heavest stuff falls out first as stream slows
b. water Fall - result of stream flowing through a hard layer of rock deposited over a softer layer. Erosin occurs in the plunge pool, face of fall is under cut and falls off. The falls migrate up stream. Some communities, such as Niagra, have attempted to halt this migration by using concrete.