STUDY ON SHORELINE VARIABILITIES OF SOUTHERN KASHIMANADA COAST ANALYZED FROM FREQUENTLY OBSERVED SAR DATA

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  • SAR衛星による高頻度観測結果を用いた鹿島灘南部の汀線変動解析
  • SAR エイセイ ニ ヨル コウヒンド カンソク ケッカ オ モチイタ カシマナダ ナンブ ノ テイセン ヘンドウ カイセキ

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 Variation of shoreline positions of 16 km-long sandy Kashima Coast, a littoral cell, with Kashima Port at the north end and Hasaki Fishery Port at the southern end, has been observed from SAR (Synthetic Aperture Radar) satellite. Since SAR is able to observe data in day and night times, and cloudy weather conditions, it can frequently collect scenes than optical satellites. In this study, 32 scenes from year 2006 to 2016 observed by ALOS / PALSAR (operated by JAXA, 2006 - 2011), and ALOS-2 / PALSAR-2 (JAXA, 2014 to present) is analyzed to trace long-term and seasonal variations. First, bulk statistics of shoreline position variations are discussed. The variation of overall mean shows some seasonal fluctuation, however, it has no trend meaning the coast is almost stable during the period. Then, EOF (Empirical Orthogonal Function) analysis is applied to separate the variation into several major modes. First mode looks to represent variation of simultaneous and seasonal movements of the shoreline position due to cross-shore sediment, and the second mode due to long-shore sediment. EOF analysis is also done with partial data set, one scene per year, to compare the result with full data set analysis. As a result, we got similar modes for spatial functions of EOF modes, however, temporal functions were quite different. This is showing the frequent acquisition of data is essential to understand the details of shoreline variabilities in a littoral cell, especially the seasonal.

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