Helmand River Hydrologic Studies Using ALOS PALSAR InSAR and ENVISAT Altimetry

The Helmand River wetland represents the only fresh-water resource in southern Afghanistan and one of the least mapped water basins in the world. The relatively narrow wetland consists of mostly marshes surrounded by dry lands. In this study, we demonstrate the use of the Advanced Land Observing Sat...

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Bibliographic Details
Published in:Marine geodesy 2009-07, Vol.32 (3), p.320-333
Main Authors: Lu, Zhong, Kim, Jin-Woo, Lee, Hyongki, Shum, C. K., Duan, Jianbin, Ibaraki, Motomu, Akyilmaz, Orhan, Read, Chung-Hye
Format: Article
Language:English
Subjects:
ALOS (satellite)
Altimeters
Altimetry
Helmand River
InSAR
Marine
Marshes
Rivers
satellite altimetry
Satellite imagery
Synthetic aperture radar
water level change
Wetlands
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Summary:The Helmand River wetland represents the only fresh-water resource in southern Afghanistan and one of the least mapped water basins in the world. The relatively narrow wetland consists of mostly marshes surrounded by dry lands. In this study, we demonstrate the use of the Advanced Land Observing Satellite (ALOS) Phased Array type L-band Synthetic Aperture Radar (PALSAR) Interferometric SAR (InSAR) to detect the changes of the Helmand River wetland water level. InSAR images are combined with the geocentric water level measurements from the retracked high-rate (18-Hz) Environmental Satellite (Envisat) radar altimetry to construct absolute water level changes over the marshes. It is demonstrated that the integration of the altimeter and InSAR can provide spatio-temporal measurements of water level variation over the Helmand River marshes where in situ measurements are absent.
ISSN:0149-0419
1521-060X
DOI:10.1080/01490410903094833