“stream power”的概念、定义、翻译、参考文献-科学参考

stream power

Geology and Earth Sciences

The rate at which a stream can do work, especially the transport of its load, and measured over a specific length. It is largely a function of channel slope and discharge and is expressed by Ω‎ = γ‎Qs, where Ω‎ is the power, γ‎ is the specific weight of water, Q is the discharge, and s is the slope. Streams tend to adjust their flow and channel geometry in order to minimize their power (see least-work principle).

Geography

This describes the energy available, measured in watts, in a particular area of channel. It is calculated at any given cross-section in a river by the equation:
$Ω = ρ g Q S$
where Ω‎ is stream discharge, ρ‎ is the density of water (1000 kg/m³), g is acceleration due to gravity (9.8 m/s²), Q is discharge (m³/s), and S is the channel slope.
Total stream power can be related to rates of bank or bed erosion.
Unit stream power (P) describes the energy available per unit width of channel, and provides a more detailed insight into morphological processes:
$P = \frac{ρ g Q S}{w}$
where w is water width in metres and the other variables are in the earlier stream power equation.
Unit stream power can be used to predict when particles are entrained and the rate at which they move downstream. It may also be used to assess the likely morphological impact of altering one or more independent fluvial variables.
http://water.epa.gov/scitech/datait/tools/warsss/pla_box18.cfm EPA public access website with RIVERMorph program, which may be used to determine changes in unit stream power and thence to predict any resulting responses by the channel.

单词	stream power
释义	stream power Geology and Earth Sciences The rate at which a stream can do work, especially the transport of its load, and measured over a specific length. It is largely a function of channel slope and discharge and is expressed by Ω‎ = γ‎Qs, where Ω‎ is the power, γ‎ is the specific weight of water, Q is the discharge, and s is the slope. Streams tend to adjust their flow and channel geometry in order to minimize their power (see least-work principle). Geography This describes the energy available, measured in watts, in a particular area of channel. It is calculated at any given cross-section in a river by the equation: $Ω = ρ g Q S$ where Ω‎ is stream discharge, ρ‎ is the density of water (1000 kg/m³), g is acceleration due to gravity (9.8 m/s²), Q is discharge (m³/s), and S is the channel slope. Total stream power can be related to rates of bank or bed erosion. Unit stream power (P) describes the energy available per unit width of channel, and provides a more detailed insight into morphological processes: $P = \frac{ρ g Q S}{w}$ where w is water width in metres and the other variables are in the earlier stream power equation. Unit stream power can be used to predict when particles are entrained and the rate at which they move downstream. It may also be used to assess the likely morphological impact of altering one or more independent fluvial variables. http://water.epa.gov/scitech/datait/tools/warsss/pla_box18.cfm EPA public access website with RIVERMorph program, which may be used to determine changes in unit stream power and thence to predict any resulting responses by the channel.
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