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Hydrol. Earth Syst. Sci., 22, 2867-2880, 2018
https://doi.org/10.5194/hess-22-2867-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
09 May 2018
Daily GRACE gravity field solutions track major flood events in the Ganges–Brahmaputra Delta
Ben T. Gouweleeuw1, Andreas Kvas3, Christian Gruber1, Animesh K. Gain2, Thorsten Mayer-Gürr3, Frank Flechtner1, and Andreas Güntner1 1GFZ German Research Centre for Geosciences, Section 5.4 Hydrology, 14473 Potsdam, Germany
2Christian Albrecht University Kiel, Institute of Geography, Ludewig-Meyn-Str. 14, 24098 Kiel, Germany
3Graz University of Technology, Institute of Geodesy, 8010 Graz, Austria
Abstract. Two daily gravity field solutions based on observations from the Gravity Recovery and Climate Experiment (GRACE) satellite mission are evaluated against daily river runoff data for major flood events in the Ganges–Brahmaputra Delta (GBD) in 2004 and 2007. The trends over periods of a few days of the daily GRACE data reflect temporal variations in daily river runoff during major flood events. This is especially true for the larger flood in 2007, which featured two distinct periods of critical flood level exceedance in the Brahmaputra River. This first hydrological evaluation of daily GRACE gravity field solutions based on a Kalman filter approach confirms their potential for gravity-based large-scale flood monitoring. This particularly applies to short-lived, high-volume floods, as they occur in the GBD with a 4–5-year return period. The release of daily GRACE gravity field solutions in near-real time may enable flood monitoring for large events.
Citation: Gouweleeuw, B. T., Kvas, A., Gruber, C., Gain, A. K., Mayer-Gürr, T., Flechtner, F., and Güntner, A.: Daily GRACE gravity field solutions track major flood events in the Ganges–Brahmaputra Delta, Hydrol. Earth Syst. Sci., 22, 2867-2880, https://doi.org/10.5194/hess-22-2867-2018, 2018.
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Short summary
Daily GRACE gravity field solutions have been evaluated against daily river runoff data for major flood events in the Ganges–Brahmaputra Delta in 2004 and 2007. Compared to the monthly gravity field solutions, the trends over periods of a few days in the daily gravity field solutions are able to reflect temporal variations in river runoff during major flood events. This implies that daily gravity field solutions released in near-real time may support flood monitoring for large events.
Daily GRACE gravity field solutions have been evaluated against daily river runoff data for...
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