@techreport{oai:jaxa.repo.nii.ac.jp:00004515,
 author = {Won, Joong-Sun},
 month = {},
 note = {L-band interferometric SAR (InSAR) has been used to detect a relative water level change in the floodplain of the Tonle Sap, Cambodia. The goal of this research is a pattern and trend analysis of flooding around the Tonle Sap. The flood pattern over the Tonle Sap area during 2007-2011 has been examined using ALOS PALSAR to monitor the flood pattern, water level fluctuation and the area of flood around the Tonle Sap. Previous studies had shown L-band SAR interferometry is a useful method for the estimation of water level change. Since the floodplain around lake is covered with tropical forest, L-band SAR is a unique and effective tool for tracing the water level variation under the forest cover-top. Water level fluctuation has affected on radar backscattering mechanism in the floodplain and the mechanism in the Tonle Sap was also examined by using PALSAR quad-polarization data. Entropy-alpha decomposition showed that the northwest part to the lake (floodplain, wetland) had a dominant double-bounce. The double-bounce helps to trace the seasonal change of water level and to detect the area of flood covered with tropical forest. PALSAR interferometric fringes were well observed in the wet season of 2007. The total flooded areas during wet season were effectively mapped by coherence maps. Although seasonal water level variation during the early wet season in 2008 (0.5 m) was smaller than that in 2007 (2 m), the minimum and maximum water levels were higher in 2008 than those in 2007 by about 1-2 m. The relative water level measured by InSAR was compared with ground-measured data, and it confirmed the InSAR measurements during the wet seasons of 2007 and 2008. Since the absolute water level of 2007 was, however, lower than that of 2008 by 1-2 m, the total size of floodplain in 2008 was much larger than that in 2007., Although the InSAR is an effective tool for the water level measurement in Tone Sap, InSAR measurement alone has a limitation in studying a time series variation of water level due to relatively sporadic data acquisition considering a short period of water level changes in floodplain during wet season. Therefore, space-borne altimetry and a water circulation modeling should be combined together with PALSAR InSAR in this area in the future study., 形態: カラー図版あり, 形態: DVD-ROM1枚, Physical characteristics: Original contains color illustrations, Note: One DVD-ROM, 資料番号: AA0065135045, レポート番号: JAXA-SP-11-007E},
 title = {Water Level Measurement in Floodplain using ALOS PALSAR},
 year = {2011}
}