A Study on Preservation of Underwater Archaeological Relics

水下考古文物保护研究

• 批准号: 03451057
• 负责人: IINO Hisakazu
• 金额: $ 2.11万
• 依托单位: Syowa Women's University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1991
• 资助国家: 日本
• 起止时间: 1991 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-03451057/
• 关键词: seabed deposition environment; temperature changes in seabed; chemical and microbiological investigation of seawater; dissolved oxygen and sulfate-reducer; metal corrosion in the sea; insect control method using copper net.; aerobic sea area; salt

Part of the present state of Kaiyo-maru preserved in the seabed has been revealed through two-year measurements of temperature changes in the seabed and chemical and microbiological investigation of the seawater.The seawater temperature varied remarkably in the range of 4 to 22ﾟC over a period of a year. In addition, the seabed temperature temporarily showed rapid changes when the weather took a winter-type pressure pattern. This is attributed to the seawater exchange in Esashi Harbor, which was supposed to cause the outflow of particles in the harbor. This means that it is difficult to realize the insect control effect by producing a reductive environment with copper ions and sediment. The concentration of dissolved oxygen showed only seasonal changes, but not secular ones. Copper ions were observed in the sea-water immediately above the copper net, but not in the intermediate and surface water. This suggests that at present surrounding pollution is not a problem. The copper net was most severely worn at sites where the seawater struck hard, but there seems no fear of erosion by components in the sludge. Common bacteria were detected on the order of 10^2-10^3 in all samples. This area of the sea was thought to be aerobic, because the seabed is around 10m deep. This was supported by the absence of sulfate-reducers. The harbor was very turbid for a local one due to the sludge and microbes, which was thought to cause increasing corrosion. The above results lead to a conclusion that Kaiyo-maru should be early salvaged.Especially iron ones, are most affected. These relics should be early retreated and stored in a well-equipped warehouse.

通过对海底温度变化的两年测量以及对海水的化学和微生物调查，揭示了保存在海底的海洋丸的部分现状。海水温度在一年的时间内在4至22摄氏度之间发生了显着变化。此外，当天气呈冬季型气压模式时，海底温度暂时出现快速变化。这是由于江ashi港的海水交换，这应该是导致港口中的颗粒流出。这意味着通过用铜离子和沉积物产生还原性环境难以实现昆虫控制效果。溶解氧浓度的季节性变化不明显。铜离子被观察到在海水中的直接上方的铜网，但不是在中间和表面水。这表明，目前周围的污染不是一个问题。在海水猛烈冲击的地方，铜网磨损最严重，但似乎不必担心污泥中的成分会腐蚀。在所有样品中检测到的常见细菌数量级为10^2-10^3。这片海域被认为是有氧的，因为海床大约有10米深。这是由硫酸盐还原剂的存在支持。由于淤泥和微生物的存在，港口对于当地来说非常浑浊，这被认为是导致腐蚀加剧的原因。以上结果表明，海洋丸应尽早打捞，尤其是铁质的，受影响最大。这些文物应尽早进行退修，并存放在设备齐全的仓库中。