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The Guangyuan Thousand-Buddha grotto is of great value in researching the spread of Buddhism in China. To explore a scientific deterioration degree evaluation method, the authors selected 11 grottos from the middle Tang Dynasty in the Guangyuan Thousand-Buddha grotto as survey objects; a traditional deterioration investigation was undertaken, and an analytic hierarchy process (AHP method) was applied to build a system to calculate the weight of 15 deterioration criteria and evaluate the deterioration degree of the grotto. The results showed that 15 deteriorations can be classified into two categories: stability deterioration and weathering deterioration. Each deterioration has its own weight on affecting the preservation condition of the grotto. In contrast to realistic conditions, the calculation results can quantitatively reflect the preservation condition of the grotto. The results offer a quantitative basis for determining the priority of grotto conservation and verifying the feasibility of the AHP method in helping conservators identify major deteriorations or judge conservation orders. This research proposes a quantitative evaluation method for the deterioration degree of the grotto, which can lay the foundation for further conservation of the grotto. Graphical Abstract

heritage science

A quantitative evaluation based on an analytic hierarchy process for the deterioration degree of the Guangyuan Thousand-Buddha grotto from the Tang Dynasty in Sichuan, China