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Envisat radar altimetry measurements of water level in a semi-arid river with complex morphology: The Lower Save, Southern Africa
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Authors
Advisor(s)
Abstract(s)
Although there are numerous studies on water level changes
in large rivers using satellite radar altimetry, there is no
altimetry-based published study with specific focus on rivers
of semi-arid areas smaller in width and with braided or
wandering reaches. Taltimetry to measure water level
fluctuations in a river with such characteristics. The lower
Save River, a heavily silted river in Southern Africa with a
dominant braided pattern, was chosen for this study. The
presence of multiple narrow and shallow channels in many
sections of the lower Save and the existence of sandbanks,
channel bars and small islets represent additional challenges
for the processing of altimetry water level measurements.
High sampling rate radar altimeter data from the Envisat
35-day exact repeat mission (June 2002 to October 2010)
were used in this study. The obtained altimetric water level
time series do exhibit a similar variation pattern and show a
reasonably good agreement with the nearest river gauge data
available, especially when the hydraulic characteristics are
similar along the river stretch between both monitoring points
and these are not too far apart, and when the return radar
signals are not so contaminated by land features. Some of the
results are comparable to those from other studies for large
rivers, indicating that Envisat radar altimetry can be used to
derive water levels for the lower Save, a semi-arid river with
relatively small widths and complex channel morphologies.
Description
Keywords
Satellite radar altimetry Envisat River water level Braided river Save River Southern Africa . Faculdade de Ciências Exatas e da Engenharia
Citation
Lopes, L. G. (2020). Envisat radar altimetry measurements of water level in a semi-arid river with complex morphology: The Lower Save, Southern Africa. International Journal of Emerging Trends in Engineering Research, 8(1), 23-30. DOI: 10.30534/ijeter/2020/05812020
Publisher
WARSE