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19 Cards in this Set
- Front
- Back
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concentrated flows of water in channels.
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stream/river
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occurs when a stream exceeds channel capacity
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flooding
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stream processes
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erosion, transportation and deposition
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streams begin as ______, then coalesce as _________ that erodes substrate.
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runoff, sheetwash.
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increases channel depth
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downcutting
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increases channel length
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headward erosion
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side channels
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tributaries
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drainage network
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configuration of trunk streams and tributaries
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dendritic drainage network
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branch or tree like; common in regions of uniform composition.
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radial drainage network
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drainage in all directions from one point of high elevation, found at perimeter of high feature.
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rectangular drainage network
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drainage aligned primarily in two directions, common in gently sloping regions of orthogonally joined rocks.
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trellis drainage network
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trunk stream flows through resistant rocks, tributaries flow between ridges. common where substrate alternates through erodible and resistant material.
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parallel drainage pattern
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several streams with parallel courses, common in regions of uniform slope.
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drainage basin
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land areas that drain into a trunk steam or body of water
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drainage divide
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ridges or peaks that separate drainage basins from each other.
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continental divides
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separate drainage basins that flow to different major bodies of water
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permanent (perennial) stream
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- flows all year at or below water table. occurs in humid or temperate climates with sufficient rainfall.
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ephemeral streams
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- dry up part of the year and exist above water table. exists in dry climates with low rainfall and high evaporation or where deep freezes/thaws occur.
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discharge
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the amount of water flowing in a channel. is not uniform. volume passing a certain point per unit of time.
ex: cubed ft/s. multiply cross sectional area X water velocity. D = A x V |
