Core Physical Flashcards
drainage basin system
natural system. area drained by a river and any tributariea
River Discharge
volume of water passing through cross-sectional area (cumecs)
Stores
Interception, soil water, surface water, groundwater, channel storage
Flows
Above Ground: Throughfall, stemflow, overland flow, channel flow
Below Ground: Infiltration, percolation, throughflow, groundwater flow, baseflow
Hydrograph
graph that shows river discharge over time
Hydrographs show:
rising limb, falling limb, discharge, lag time, baseflow, stormflow, bankfull discharge
Influences on hydrograph
storm events, type of precipitation, evaporation, seasons, antecedent moisture
drainage density
high: more streams and rivers
Low: less streams and rivers
Corrasion
scraping and grinding
Solution
water dissolving
hydraulic action
water causes rocks to fragment when channel is hit
Cavitation
water enters small gaps, widens cracks
Traction
large rocks & pebbles rolled
saltation
pebbles, bounced
suspension
small pebbles carried
solution
soluble, materials carried
hjulstrom curve
graph that shows velocity and river materials
Laminar, Turbulent, Helicoidal
Laminar: straight
Turbulent: disorderly, change in velocity, eddies
Helicoidal: corkscrew, meanders,