The Fundamental Study on the Methods of investigation, Study, and Conservation of the site at the Mongol Invasion in Takashima Seabed

本研究的主要工作是在高岛南部海岸的沿着区域进行实地研究。除了这种方法的保护处理恢复文物波在实验室检查。为了进行比较研究，还对冲绳县石垣市的下田流近海海底进行了实地考察，并绘制和记录了恢复的陶瓷波。由于高岛的地面地形和海底地形形成连续关系，从海上到陆地进行了观测，并用电视摄像机进行了视觉记录。这是作为实地调查的一部分进行的。同时，在沿着固定测线巡航的同时，对海底剖面，即测线下的深度和地层进行连续测量。根据用侧扫声纳对整个著名遗址的海底地形拍摄的表面声纳图像照片的结果，在那些被认为极有可能埋藏考古特征和文物的地区进行了潜水。对这些区域进行详细检查并进行目视记录。以Urashimoura为中心，被认为是最有可能保留文物的区域，该区域被仔细调查，并使用额外的侧扫声纳，海底剖面仪和电磁测量。此外，在观察到积极反应的3个地点进行了钻探，并采集了海底沉积层样品。还采集了次结构数据和测年样本，用于次海底剖面仪数据分析。

The major work undertaken in this study was the conducting of a field study in the zone along the southern shore of Takashima. In addition to this methods of conservation treatment of recovered artifacts wave examined in a laboratory. For purpose of comparative research a field study of the Shitadaru offshore seabed site of Ishigaki City in Okinawa Prefecture was also carried out, with the ceramic waves recovered being drawn and catalogued.As the ground topography of Takashima and the seabed topography form a consecutive relationship, observations were made from the sea to the land, and recorded visually with a TV camera. This was carried out as part of the field survey. Simultaneously a seabed section, namely, the depth and ground stratum under a fixed measuring line were measured continuously while cruising along that line. Based on the results of surface sonar image photographs taken with a side scan sonar of the seabed topography throughout the whole extent of the well known site, dives were made in those areas in which it was thought highly possible that archaeological features and artifacts could be buried. These areas were examined in detail and recorded visually. Centering around Urashimoura, judged as the most likely area in which artifacts could still remain, the area was surveyed carefully, with additional side scan sonar, sub-bottom profiler, and electromagnetic surveys. Furthermore, boring was carried out at 3 of the points at which positive responses were observed, and samples of seabed sediment stratum taken. Substructure data and dating samples were also taken for sub-bottom profiler data analysis.