SHORELINE POSITIONS AND BOTTOM PROFILES RETRIEVED FROM SYNTHETIC APERTURE RADAR

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  • 合成開口レーダによる海岸地形情報の抽出
  • ゴウセイ カイコウ レーダ ニ ヨル カイガン チケイ ジョウホウ ノ チュウシュツ

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 Synthetic Aperture Radar (SAR) is a powerful tool in retrieving shoreline positions and surface wave patterns in the nearshore, since it can gather scenes in any weather condition. The interpretation of scenes is sometimes not straightforward due to the various parameters set in the active observation of SAR. In this study, several scenes which captured Kashimanada Coast, Japan were analyzed to infer the usability of SAR data to extract shoreline positions and wave number variations in the nearshore, and also the influence of various parameters in the observation is discussed. Shoreline positions along the 15 km long sandy beach were digitized manually from the scene, and compared with aerial laser scanning survey data. The mean accuracy of shoreline position detection was in order of 10 m, which is equivalent to the resolution of SAR observation. Local accuracy decreased at regions where local foreshore slopes were mild, which was probably affected by the water content in the surface layer of sandy beach. Wave number variations from offshore to onshore were analyzed with two dimensional Fast Fourier Transform. Refraction of waves was confirmed: increase of wave number and deflection of wave angle. Off-nadir angle in SAR observation is an important parameter in coastal observation. If this angle is set to an optimized value for land observation, backscatter from water bodies is small. On the other hand, if this is angle is set smaller, backscatter from water bodies increases and wave pattern and shoreline position are captured more clearly.

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