Observations of wave field and intertidal morphology with X-band radar system.

近年来，X波段航海雷达在海岸研究中的应用已成为热门。为了说明X波段雷达系统在高海浪条件下海岸测量的有效性，对X波段雷达在风暴事件和平静条件下进行了潮间地形和波浪抬高观测。雷达系统在日本滨崎的研究码头运行，在风暴过后和平静条件下连续采集雷达回波图像。对雷达回波图像进行了分析，讨论了(I)平均岸线位置和潮间带前岸坡度的沿岸分布和(Ii)波浪抬高的时间和空间变化。潮间水深监测结果描述了海岸剖面的季节变化。在平静的条件下，岸线变得不平坦，形成了数百米波长的尖端。在暴风雨条件下，尖点和其他韵律特征消失，海岸线变得均匀。

Applications of X-band nautical radars for coastal studies have become popular recently. Intertidal morphology and wave run-up observations an monitoring with an X-band radar during a storm event and calm conditions were conducted to show the effectiveness of radar system in coastal measurements under high wave conditions.The radar system was operated at the research pier HORS, Hasaki Japan, and radar echo images were collected during a passage of storms and for calm condition continuously.Analyses on radar echo images were done and (i)longshore distribution of mean shoreline positions and intertidal foreshore slopes, and (ii)temporal and spatial variation of wave run-up, are discussed.The result intertidal bathymetry monitoring describes the seasonal changes of shore profiles. The shore profile becomes uneven under calm conditions forming cusps with wavelength of several hundred meters. Under stormy condition, cusps and other rhythmic features disappear and coastline becomes homogeneous.