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

最近，X波段航海雷达在海岸研究中的应用越来越普遍。在一次风暴和平静情况下，进行了潮间带形态和波浪爬高的观测，并使用X波段雷达进行监测，以显示雷达系统在高波浪条件下测量海岸的有效性。雷达系统在日本Hasaki的HORS研究码头运行，在一次风暴过境期间和平静条件下连续采集雷达回波图像，并对雷达回波图像进行了分析。讨论了海岸平均岸线位置和潮间前滩坡度的沿程分布以及波浪爬高的时空变化，结果显示了海岸剖面的季节性变化。在平静条件下，海岸剖面变得不均匀，形成波长为数百米的尖点。在风暴条件下，尖点和其他节奏特征消失，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.