A novel method of surveying submerged landslide ruins: Case study of the Nebukawa landslide in Japan
A novel method of surveying submerged landslide ruins: Case study of the Nebukawa landslide in Japan
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测量水下滑坡遗址的新方法：日本睡川滑坡案例研究
DOI：
10.1016/j.enggeo.2014.11.010
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发表时间：
2015
影响因子：
7.4
通讯作者：
Toshitaka Kamai
中科院分区：
文献类型：
--
作者：
Shintaro Yamasaki;Toshitaka Kamai
我们调查了 1923 年睡川山体滑坡的水下遗址，该山体滑坡是由 1923 年关东地震造成的。受山体滑坡影响的陆地区域已经恢复，山体滑坡的证据大部分已经消失，但潜水员在山体滑坡区域附近的海底观察到了似乎是人造的巨大结构。我们使用专为休闲用途设计的探鱼器和其他低成本设备来进行海洋声学调查。由于根部川附近的受影响区域靠近海岸且水浅，而且工具足够轻，因此我们能够使用充气筏进行调查。我们创建了测深图和侧扫描图像，显示了滑坡体的特征和暴露在海底的分散的巨大结构。声学调查结束后，我们进行了潜水调查，并确定这些结构是由混凝土制成的，很可能是旧睡川车站的一部分。废墟从原来的监测站位置水平移动了约 260 至 320 m（距海岸 110-170 m），并与滑坡体的粗岩石碎片混合在一起。底部物质的分布表明，山体滑坡袭击了海底，然后移动至距离海岸线 460 米的地方。该滑坡的等效摩擦系数（H/L）约为0.15，表明其具有较高的流动性。滑坡可能转变为与基底沙质沉积物混合的湍流，将碎片推向更远的海岸。
We investigated submerged ruins from the 1923 Nebukawa landslide, which was caused by the 1923 Kanto earthquake. The on-land areas affected by the landslide have been restored and evidence of the landslide is mostly gone, but huge structures that appear to be man-made have been observed by divers on the seafloor near the area of the landslide. We used a fish finder designed for leisure use and other low-cost equipment to conduct a marine acoustic survey. Because the affected area off Nebukawa is close to shore and shallow and the tools were sufficiently lightweight, we were able to use an inflatable raft for the survey. We created a bathymetric map and side-scan images showing features of the landslide mass and scattered huge structures exposed on the seafloor. After the acoustic investigations, we conducted a diving investigation and were able to ascertain that the structures were made of concrete and were most likely parts of the old Nebukawa station. The ruins were displaced about 260 to 320 m horizontally from the original station location (to 110–170 m offshore) and were mixed with coarse rock fragments from the landslide mass. The distribution of bottom materials suggests that the landslide struck the seafloor and then traveled as far as 460 m offshore from the coastline. The landslide had an equivalent coefficient of friction (H/L) of about 0.15, indicating high mobility. The landslide probably transformed into a turbulent flow mixed with basal sandy sediments, which propelled the debris farther offshore.
影响因子：
1.9
作者：
Singh, H;Adams, J;Foley, B
通讯作者：
Foley, B
影响因子：
6.7
作者：
T. Kamai
通讯作者：
T. Kamai