Using Remote Sensing to Estimate Water Resources from Glacial Melt Prof. Kenneth L. Verosub Dept of...
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Transcript of Using Remote Sensing to Estimate Water Resources from Glacial Melt Prof. Kenneth L. Verosub Dept of...
Using Remote Sensing to Estimate Water Resources
from Glacial Melt
Prof. Kenneth L. Verosub
Dept of Geology
University of California, Davis,
River ProfileRiver Profile
Use width to determine height from topographic profile.
An Alternate Approach (con’t)
Q = v A
v = c (RS)1/2
Basic flow equation:
where Q is discharge, v is velocity and A is area
Chezy equation:
where c is a constant, R is hydraulic radius and S is the slope of the channel.
Hydraulic radius is the area divided by the wetted perimeter.
c = (1/n) R1/6
Q = (1/n) A R2/3 S1/2
Manning Chezy equation:
Manning equation:
where n is the roughness coefficient.
Note: A, R, and S can be determined from detailed topography or a DEM, and n can be estimated visually.
Obtain topographic maps or DEMs (at low flow) from stereo image pairs, SRTM and/or Lidar.
Determine topographic profile and slope for target site.
Calculate other geometric parameters from width vs. depth relationship.
Use Manning-Chezy Equation (and others) to calculate discharge as a function of width.
Use regular imagery to determine flows at other dates/times.
Basic Methodology
Area (A)PerimeterHydraulic Radius (R)Mean Depth (Ym)
Width (W) vs. Depth
Numerical integration of
to obtain
for any given depth.
Q = (1/n) A R0.67 S0.5
Q = 7.1 A Ym0.67 S0.33
Q = 7.22 W1.02 Ym1.74 S0.33
Q = 4.62 W1.17 Ym1.57 S0.34
Bjerklie et al. equation:
Dingman and Sharma equation:
Manning (Bjerklie) equation:
Manning Chezy equation:
6/25/2006
12/27/2003
6/01/2007
3/8/2009
3/18/2006
a
6/4/2010
Cosumnes at Michigan Bar (CA) – Chronological
6/25/2006
12/27/2003
6/01/2007
3/8/2009
3/18/2006
a
6/4/2010
Cosumnes at Michigan Bar (CA) – Sequential
6/4/201032
6/25/20066.4
12/27/20039.7
6/01/20072.7
3/8/200929
3/18/200666
a
Cosumnes at Michigan Bar (CA) – Sequential (II)
Increase spatial resolution of current monitoring efforts.
Determine flows for critical times for sites where gauging stations have been lost or abandoned.
Application – Monitoring Rivers
Increase spatial resolution of current monitoring efforts.Determine flows for critical times for sites where gauging stations have been lost or abandoned.
Obtain new flow data from physically inaccessible areas, such as high mountains and deserts.
Obtain new flow data from restricted areas, such as military bases and wilderness areas.
Application – Monitoring Rivers
Increase spatial resolution of current monitoring efforts.Determine flows for critical times for sites where gauging stations have been lost or abandoned.
Obtain new flow data from physically inaccessible areas, such as high mountains and deserts.
Obtain new flow data from restricted areas, such as military bases and wilderness areas.
Combine with Lidar for total “state of the river” analysis.
Application – Monitoring Rivers