STUDY ON SHORELINE VARIABILITIES OBSERVED AT THE SOUTHERN END OF KASHIMANADA COAST

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  • 鹿島灘南端部の汀線変動の特徴
  • カシマナダ ナンタンブ ノ テイセン ヘンドウ ノ トクチョウ

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 Variation of shoreline position at the southern end of 17 km-long Kashima Coast, with Kashima Port at the north end and Hasaki Fishery Port at the southern end, has been observed with a X-band radar for 6 years. The radar captures hourly distribution of shoreline position approximately over 4 km. At the southern end, there is a 1 km long breakwater of the fishery port, which shelters southern incident waves. Further, the sandy beach is protected by headlands and a jetty from erosion. Shoreline positions of approximately every 2 days have been digitized from the radar images. Mean shoreline positions and shoreline inclinations of 4 sections bordered with headlands and jetty have been analyzed. Mean shoreline positions of all sections migrated seawards continuously during the observation period. At the farthest section from the fishery port, shoreline inclination showed a seasonal variation accordant with the wave incidence direction: sand between headlands is transported to the downwave resulting periodic changes in shoreline inclination. On the other hand, shoreline inclination close to the fishery port varied in a different manner due to sheltering effect of breakwater.

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