The Archaeological research and the study concerning historic site maintenance of Thanh Nha Ho.

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The purpose of this investigation is archaeological research and making of a plan for the presentation of the historic site of Thanh Nha Ho, which was located at Thanh Hoa province in Vietnam. As a result of following concrete investigation, we could obtain good results.1. We drew up a 1/500 scale survey map of Thanh Nha Ho.2. We did the 3D laser scanning of the north gate by 3D laser scanner, and we could evaluate the numerical number. This number will be a basic data for conservation and restoration in the future.3. To investigate the present condition of this wall, we took photos of each wall on east-west-south-north and recorded the situation at present. By this, we could get basic materials for future maintenance.4. The result of chemical analysis and geological research of stone used for this wall gave us conclusion that limestone was used. Also, we executed the field research of stone at quarry and confirmed the spot of it is possibility.5. For reconstruction and presentation of the site at Thanh Nha Ho from now on, we set up a bench mark for survey which would be able to look over the whole site. 4datum points made of brass were at four corners on the around of castle wall, 4nail datum points were on each gates of east- west-south-north, and 8datum points in all were set up.6. As the result of establishing 4trenches at that point considered as the mainhall and doing the excavation, a part of the construction features and potteries of 14-15century made in Vietnam and China were found. As a conclusion of this research, the archaeological features were constructed well in underground, and we could get the basic information for historical site maintenance in the future. In addition to that, it is considered that the excavated archaeological features were followed with the grade of build the castle in the 15 century.