How is stream power calculated?
How is stream power calculated?
Stream power is calculated as: ρgQs where ρ is density of water (1000 kg/m3), g is acceleration due to gravity (9.8 m/s2), Q is discharge (m3/s) and S is channel slope. Q is calculated as WdV where W is bankfull channel width (m), d is bankfull channel depth, and v is velocity (m/s).
Why is stream power important in fluvial geomorphology?
It determines which areas along rivers are susceptible to erosion hazards, sedimentation, and impaired water quality. Stream power, which is essentially the product of stream discharge, stream slope, and the weight of water, has a direct relationship with sediment transport.
How do you calculate the slope of a stream?
How to determine your stream slope:
- Determine a length of area you want to work with (at least 100 ft. long), mark the upstream & downstream points.
- Place a stake with string. Pull string to downstream mark.
- Calculate your slope using the equation:
- Use your Slope% to classify your stream as Steep, Moderate, or Gentle.
What is Stream Power Index?
The Stream Power Index (SPI) is a measure of the erosive power of flowing water. SPI is calculated based upon slope and contributing area. SPI approximates locations where gullies might be more likely to form on the land- scape.
Who is known as the father of stream power?
The person widely considered the “Father of Electricity” is Sir William Gilbert. Sir William Gilbert was born on 24 May 1544 in Colchester, Essex.
What is the unit of stream power?
Unit stream power, defined as the time rate of potential energy expenditure per unit weight of water, is shown to be the dominant factor in the determination of total sediment concentration. Basic concepts in fluid mechanics and boundary layer theory are used to establish the flow condition at incipient motion.
What is fluvial processes and landforms?
In geography and geology, fluvial processes are associated with rivers and streams and the deposits and landforms created by them. When the stream or rivers are associated with glaciers, ice sheets, or ice caps, the term glaciofluvial or fluvioglacial is used.
What is a slope of a stream?
A river’s slope is usually expressed in feet of vertical drop per mile of longitudinal reach. The changing gradient plotted over the river’s length is the stream’s longitudinal profile. The profile of most streams begins steep and gradually levels out.
What is sediment transport index?
The sediment transport index characterises the process of erosion and deposition. Unlike the length-slope factor in the Universal Soil Loss Equation (USLE) it is applicable to three-dimensional surfaces (Burrough et al. As is the upstream area and β is the slope at a given cell.
Can a modied Bagnold model predict net onshore sediment transport?
The modied Bagnold model can predict net onshore sediment transport for asymmetric, zero skewness waves. Results for analytical waveforms are compared with previous work based on discrete parti- cle simulations and two-phase o w methods and show qualitative consistency. INTRODUCTION
What is the equation for unit stream power?
Unit stream power is stream power per unit channel width, and is given by the equation: where ω is the unit stream power, and b is the width of the channel.
How is the potential energy drop related to the stream power?
Therefore, the potential energy drop is equal to the work done to the bed and banks, which is the stream power. We know that change in potential energy over change in time is given by the equation: where water mass and gravitational acceleration are constant. We can use the channel slope and the stream velocity as a stand-in for
How to define stream power per unit channel length?
We define stream power per unit channel length, so that term goes to 1, and the derivation is complete. Unit stream power is stream power per unit channel width, and is given by the equation: where ω is the unit stream power, and b is the width of the channel.