Abstract

Digital documentation by photogrammetry was applied to the Yokosuka Arsenal dry dock No. 1, which is established in 1871. Vertical and horizontal sections near the gate can be generalized from digital surface model of the dock. Leakage of seepage seawater from the joints of building stones can be identified on both sides of the walls near the gate of the dock. However, the vertical section on the southern wall had been deformed compared to the one on the northern wall. This deformation might be caused from deformation of backfill materials or underground geological sediments. Geological sediments inside the northern wall is Pleistocene, however it is Holocene inside the southern wall, depend on the geomorphological map before construction of the dock. In addition, the southern wall of the dock was collapsed and repaired in 1879. Therefore, it is estimated that geo-technical underground condition of the northern side is better than the southern side of the dock near the gate.

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