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| Titel |
Flood occurrence mapping of the middle Mahakam lowland area using satellite radar |
| VerfasserIn |
H. Hidayat, D. H. Hoekman, M. A. M. Vissers, A. J. F. Hoitink |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 16, no. 7 ; Nr. 16, no. 7 (2012-07-03), S.1805-1816 |
| Datensatznummer |
250013350
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| Publikation (Nr.) |
 copernicus.org/hess-16-1805-2012.pdf |
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| Zusammenfassung |
| Floodplain lakes and peatlands in the middle Mahakam lowland area are considered as
ecologically important wetland in East Kalimantan, Indonesia. However, due to a lack of data, the
hydrological functioning of the region is still poorly understood. Among remote sensing techniques
that can increase data availability, radar is well-suitable for the identification, mapping, and
measurement of tropical wetlands, for its cloud unimpeded sensing and night and day
operation. Here we aim to extract flood extent and flood occurrence information from a series of
radar images of the middle Mahakam lowland area. We explore the use of Phased Array L-band
Synthetic Aperture Radar (PALSAR) imagery for observing flood inundation dynamics by incorporating
field water level measurements. Water level measurements were carried out along the river, in
lakes and in peatlands, using pressure transducers. For validation of the open water flood
occurrence map, bathymetry measurements were carried out in the main lakes. A series of PALSAR
images covering the middle and lower Mahakam area in the years 2007 through 2010
were
collected. A fully inundated region can be easily recognized on radar images from a dark
signature. Open water flood occurrence was mapped using a threshold value taken from radar
backscatter of the permanently inundated river and lakes areas. Radar backscatter intensity
analysis of the vegetated floodplain area revealed consistently high backscatter values,
indicating flood inundation under forest canopy. We used those values as the threshold for flood
occurrence mapping in the vegetated area. |
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