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Earth Science
Chapter 5
35
Science
Not Applicable
11/06/2005

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Term
infiltration
Definition
water soaking into ground
Term
transpiration
Definition
plants release water vapor
Term
laminar flow
Definition
straight-line paths, slow, parallel
Term
turbulent flow
Definition
swirling motion
Term
factors that determine stream velocity
Definition
gradient
discharge
shape/size/roughness of channel
Term
gradient
Definition
vertical drop of a stream over a specified distance
Term
discharge
Definition
volume
of water flowing past a certain point in a given unit of time

discarge = channel width x channel depth x velocity
Term
longitudinal profile
Definition
cross-section along the length of a stream
gradient decreases downstream (towards mouth)
Term
base level
Definition
level below which a stream cannot erode
Term
temporary base level
Definition
lakes, resistant layers of rock, and main streams that act as base level for their tributaries
Term
ultimate base level
Definition
sea level
lowest level to which stream erosion could lower the land
Term
dissolved load
Definition
rock material transported in solution
Term
suspended load
Definition
rock material transported through a visible cloud of sediment
fine particles
large rivers
Term
bed load
Definition
coarser particles move along bottom of stream channel
occasional motion
Term
competence vs. capacity
Definition
competence - max size particles capable of transporting, related to velocity

max load, related to discharge & volume
Term
deltas
Definition
accumulation of sediment formed where a stream enters a lake or ocean
Term
natural levees
Definition
elevated landforms that parallel some streams and confine their waters, except during floodstage
Term
meanders
Definition
looplike bend in course of stream
Term
floodplain
Definition
flat low-lying portion of a stream valley subject to periodic flooding
Term
recurrence intervals
Definition
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Term
dendritic
Definition
common treelike stream drainage pattern
Term
drainage patterns
Definition
dendritic
rectangular
radial
trellis
Term
groundwater
Definition
water in the zone of saturation
Term
water table
Definition
upper level of the saturated zone of groundwater
Term
zone of saturation
Definition
zone where all open spaces in sediment and rock are completely filled with water
Term
zone of aeration
Definition
area above the water table where openings in soil, sediment, and rock are not saturated but filled mainly with air
Term
springs
Definition
a flow of groundwater that emerges naturally at the ground surface
Term
artesian well
Definition
a well in which the water rises above the level where it was initially encountered
Term
well
Definition
an opening bored into the zone of saturation
Term
cone of depression
Definition
a cone-shaped depression in the water table immediately surrounding a well
Term
land subsidence
Definition
ground sink when water is pumped from wells faster than natural recharge processes can replace it.
Term
karst topography
Definition
land shaped by groundwater
sinkholes
Term
three main zones of a river system
Definition
erosion
sediment transport
sediment deposition
Term
3 types of load
Definition
dissolved
suspended
bed
Term
flood control strategies
Definition
building fake levees
channelization
artificial cutoffs
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