Current Measurements in Rivers by Spaceborne Along-Track InSAR
Romeiser, Roland and Runge, Hartmut and Suchandt, Steffen and Sprenger, Judith and Weilbeer, Holger and Sohrmann, Ariane and Stammer, Detlef (2007) Current Measurements in Rivers by Spaceborne Along-Track InSAR. IEEE Transactions on Geoscience and Remote Sensing, pp. 4019-4031. IEEE. ISSN 0196-2892.
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The global monitoring of river discharges is a technologically challenging problem with important applications in a variety of disciplines. Due to the limited availability and / or quality of river runoff data from many regions, an increasing use of remote sensing techniques is highly desirable. Altimeter specialists have already demonstrated water level retrievals in rivers from available data. The along-track interferometric synthetic aperture radar (along-track InSAR, ATI) capabilities of state-of-the-art imaging radars on satellites such as the German TerraSAR-X, which was launched on June 15, 2007, will also permit high-resolution line-of-sight surface current measurements. In this paper we evaluate the potential of current measurements in rivers by spaceborne ATI on the basis of fundamental theoretical considerations, existing spaceborne InSAR data from the Shuttle Radar Topography Mission (SRTM), and simulated TerraSAR-X data. We show that an SRTM-derived line-of-sight surface current field in the Elbe river (Germany) agrees well with numerical hydrodynamic model results. The data quality is sufficient to resolve characteristic lateral variations of the currents in the river around a pronounced main flow channel. Assuming that the flow direction is usually aligned with the river bed, even a quasi-two-dimensional total surface current field can be derived. Simulations indicate that TerraSAR-X will be even better suited for current measurements in rivers. Depending on width, surface roughness, and relative flow direction of a river, current estimates with an accuracy better than 0.1 m/s will be possible with an effective spatial resolution of a few hundred meters to kilometers.
|Title:||Current Measurements in Rivers by Spaceborne Along-Track InSAR|
|Journal or Publication Title:||IEEE Transactions on Geoscience and Remote Sensing|
|In Open Access:||No|
|In ISI Web of Science:||Yes|
|Page Range:||pp. 4019-4031|
|Keywords:||River Current Measurement, InSAR, ATI, TerraSAR-X|
|HGF - Research field:||no assignement|
|HGF - Program:||no assignment|
|HGF - Program Themes:||no assignment|
|DLR - Research area:||no assignement|
|DLR - Program:||no assignment|
|DLR - Research theme (Project):||other|
|Institutes and Institutions:||Remote Sensing Technology Institute|
Remote Sensing Technology Institute > SAR Signal Processing
|Deposited By:||Steffen Suchandt|
|Deposited On:||23 Jan 2008|
|Last Modified:||19 Feb 2013 11:47|
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