Water level monitoring of the Mekong Delta using GNSS reflectometry technique

authored by: J. Beckheinrich, A. Hirrle, S. Schön, G. Beyerle, M. Semmling, J. Wickert
Abstract: In the last years extreme flood events occur more frequently in Vietnam. Conventional satellite altimeters offer high altimetric accuracy but with insufficient spatial and temporal resolution. Ground based instrumentation enables a high altimetric accuracy with high temporal resolution, but for a point location only. GNSS-Reflectometry (GNSS-R) reveals new perspectives for water level monitoring. To test the possibility of using this innovative technique as a gauge instrument, a two weeks lasting measurement campaign was conducted in Vietnam, in February 2012. The data analysis showed the presence of multipath effects other than the water level in the direct and the reflected signals that deteriorate the results. Using the Empirical Mode Decomposition method (EMD), the water reflections are isolated from further multipath. With a model of these reflections, a correlation of 0.84 instead of 0.67 between the GNSS-R calculated water level changes and the recorded water level changes from a gauge instrument could be reached. Furthermore, applying EMD improves the standard deviation of the determined water heights from 12cm to 5cm.
Organisation(s): Institute of Geodesy
External Organisation(s): Helmholtz Centre Potsdam - German Research Centre for Geosciences (GFZ)
Technische Universität Dresden
Type: Conference contribution
Pages: 3798-3801
No. of pages: 4
Publication date: 06.11.2014
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: Computer Science Applications, General Earth and Planetary Sciences
Electronic version(s): https://doi.org/10.1109/igarss.2014.6947311 (Access: Closed)
: Details in the research portal "Research@Leibniz University"

BibTeX

@inproceedings{b199b40361714a5a94c918a506d773cb,
title = "Water level monitoring of the Mekong Delta using GNSS reflectometry technique",
abstract = "In the last years extreme flood events occur more frequently in Vietnam. Conventional satellite altimeters offer high altimetric accuracy but with insufficient spatial and temporal resolution. Ground based instrumentation enables a high altimetric accuracy with high temporal resolution, but for a point location only. GNSS-Reflectometry (GNSS-R) reveals new perspectives for water level monitoring. To test the possibility of using this innovative technique as a gauge instrument, a two weeks lasting measurement campaign was conducted in Vietnam, in February 2012. The data analysis showed the presence of multipath effects other than the water level in the direct and the reflected signals that deteriorate the results. Using the Empirical Mode Decomposition method (EMD), the water reflections are isolated from further multipath. With a model of these reflections, a correlation of 0.84 instead of 0.67 between the GNSS-R calculated water level changes and the recorded water level changes from a gauge instrument could be reached. Furthermore, applying EMD improves the standard deviation of the determined water heights from 12cm to 5cm.",
keywords = "Altimetry, Empirical Mode Decomposition, GNSS-Reflectometry, Multipath",
author = "J. Beckheinrich and A. Hirrle and S. Sch{\"o}n and G. Beyerle and M. Semmling and J. Wickert",
year = "2014",
month = nov,
day = "6",
doi = "10.1109/igarss.2014.6947311",
language = "English",
pages = "3798--3801",
booktitle = "2014 IEEE International Geoscience & Remote Sensing Symposium",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
address = "United States",
note = "Joint 2014 IEEE International Geoscience and Remote Sensing Symposium, IGARSS 2014 and the 35th Canadian Symposium on Remote Sensing, CSRS 2014 ; Conference date: 13-07-2014 Through 18-07-2014",
}