Study on Preservation Methods of Imperial Citadel of Thang Long Based on Heat and Moisture Movement in the Remains

Abstract eng:
Imperial Citadel of Thang long located in Hanoi consists of several remains belonged to successive dynasties from 11th to 19th century and ite in 2010. Since these remains have been openly exhibited, these soil site remains were deteriorated due to drying and salt precipitation. In this study, to considerdeterioration mentioned above, which is derived from heat and moisture movement, some soil tests about thermal and hydraulic propertiesand field survey were conducted. In the field survey, meteorological observation had been conducted from 2009 and both water content and water potential in the soil were measured. Moreover, to consider preservation method by covering the remains with sandy soil, water content and water potential were also measured while covering the surface with sandy soil. Based on the results of soil tests and field survey, numerical analysis on coupled heat and moisture transfer in the soil site were performed to evaluate the effectiveness of reburying method. As a result of both observation and numerical analysis, it was suggested that water content of original surface of the remains could maintain high if covered with sandy soil. Hence, we may conclude that it is effective to cover the surface with sandy soil to preserve the remains.

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