Publications
Quantitative Assessment of Sandstone Weathering Based on Multi-Data Combination of Nondestructive Testing in the Yungang Grottoes, China
A quantitative assessment of sandstone weathering at the Yungang Grottoes reveals significant variations in degradation patterns between two walls of Cave 10. Using nondestructive testing techniques—ultrasonic pulse velocity, Leeb hardness, X-ray fluorescence, and microscopic imaging—the study identified more severe weathering on the north wall of the Chanting Corridor compared to the west wall of the Front Chamber. Differences in sulfur and calcium content were attributed to distinct microenvironmental conditions. The findings provide a scientific basis for targeted conservation strategies, emphasizing the need for adaptive approaches to preserve this culturally significant site.
The Evolution of the Clustered Lotus Incarnation in the Yungang Grottoes
A comparative analysis of the clustered lotus incarnation motifs in Yungang Grottoes' Cave 10 and Cave 5 reveals distinct stylistic influences and evolutionary trajectories. Cave 10's imagery shows strong Western Regions and Gandhara elements, likely influenced by Khotan's sculptural traditions and Wang Yu's standardized iconographic system, while Cave 5's lotus incarnations exhibit the elegant slender style (Xiugu Qingxiang), shaped by Pingcheng's cultural strength, Longmen area's artistic fashion, and above-ground temple decorative styles. This study highlights that Pure Land themes in Yungang pre-sixth century do not always conform to Buddhist scriptures, offering new insights into the developmental trajectory of this iconographic motif through comparative analysis with sites like Siyan Stupa at Longcheng, Yongning Temple in Luoyang, and Guyang Cave at Longmen.
A study on the detection of weathering in the Yungang Grottoes using non-Hermitian wireless sensing
A non-Hermitian wireless-sensing system demonstrates high sensitivity to weathering in stone samples from the Yungang Grottoes, enabling precise detection of material degradation. The study reveals that resonant-frequency responses vary with weathering degree, providing a novel method for assessing damage in cultural heritage sites. By analyzing the relationship between resonant frequency and constituent content, researchers can predict weathering levels in unknown samples, offering technical guidance for conservation efforts. This approach advances non-destructive testing techniques for preserving UNESCO World Heritage Sites like Yungang Grottoes.
A Study on the Multicultural Presentation in the Yungang Grottoes Sculptures
Buddhist sculptures at the Yungang Grottoes represent a unique case of multicultural synthesis, where Gandharan, Greco-Roman, and Central Plains artistic traditions were reworked to meet local Chinese religious and aesthetic needs. This 'Yungang style' is evident in garments, facial modeling, and carving techniques, as well as in the visual translation of Buddhist doctrines into locally legible narratives. The study reveals that certain narrative scenes share compositional affinities with motifs from other religious traditions, such as the Christian Annunciation, highlighting Yungang's role as a site where cultural contact led to artistic innovation rather than mere borrowing.
Alveolar Weathering Mechanism of Sandstone in the Yungang Grottoes: A Coupled Process of Moisture–Mineral Interactions and Salt Crystallization
A coupled weathering mechanism involving moisture–mineral interactions and salt crystallization has been identified as the primary driver of sandstone degradation at the Yungang Grottoes, a UNESCO World Heritage site. The study reveals that illite-rich siltstone nodules and pore structure heterogeneity accelerate microcrack propagation and cavity formation due to hydration-induced clay mineral adjustments and crystallization pressure from sulfate salts like gypsum. These findings underscore the synergistic role of clay-related structural weakening and salt damage in sandstone deterioration, providing critical insights for assessing weathering risks and guiding conservation efforts in similar semi-arid environments.
Chemical weathering records in Yungang Formation, North China: implications for stone heritage conservation
A significant discovery from the Yungang Grottoes reveals that chemical weathering, particularly feldspar dissolution, is the dominant process causing damage to these ancient structures. The study quantifies this weathering rate at 7.84 × 10−21 - 2.7 × 10−18 mol·cm-2·s−1, with a cumulative mass loss of about 0.000061% per year. When physical weathering is considered, the annual mass loss rate increases to 0.00015–0.00018%. The research indicates that without protective measures, such as maintaining a stable low-temperature environment, the grottoes could face complete destruction within 4,000–5,000 years. This study underscores the critical need for conservation efforts to mitigate temperature-induced chemical weathering, ensuring the longevity of this cultural heritage.
Exploring Bare-Hand Interaction Design and Evaluation Method for Interactive Experience of Cultural Heritage: A Case Study on the Digital Reconstruction of Yungang Grottoes
A novel bare-hand interaction (BHI) system for digital cultural heritage experiences significantly reduces cognitive load and enhances usability, immersion, and user satisfaction. Researchers developed a BHI-based interactive narrative system for the central pagoda of Yungang Grottoes demonstrating that specific narrative strategies and hand-interaction models optimize virtual heritage engagement. The study employed a combined subjective-objective evaluation method, measuring brain activity (HbO2 data), NASA-TLX scores, performance metrics, user satisfaction, and immersion levels. Findings indicate this approach is universally applicable for refining digital cultural heritage experiences and offers valuable insights for human-computer interaction research.
Microbial Community Analysis and Environmental Association in Cave 6 of the Yungang Grottoes
A high-throughput sequencing analysis of microbial communities within Cave 6 of the Yungang Grottoes revealed significant microenvironment-specific diversity and functional risks. The study identified Ascomycota-dominated fungi and Proteobacteria-rich bacteria, with the highest diversity near areas of external interaction—such as lighting windows—and the lowest in red pigment zones, likely under heavy metal stress. Human-associated microbes (e.g., Escherichia-Shigella, Malassezia) indicated anthropogenic pollution on statue surfaces. Functional predictions (PICRUSt2) highlighted elevated biodegradation risks in dust accumulation and inter-statue areas, enriched with organic-degrading and acid-producing taxa like Rubrobacter and Cladosporium. Microbial distribution was strongly influenced by environmental openness, substrate type, and human impact, offering critical insights for targeted conservation strategies.
Optimization of Natural Ventilation via Computational Fluid Dynamics Simulation and Hybrid Beetle Antennae Search and Particle Swarm Optimization Algorithm for Yungang Grottoes, China
Researchers have identified an optimal natural ventilation strategy for the Yungang Grottoes, China, using computational fluid dynamics (CFD) simulations and a hybrid optimization algorithm. The study found that a configuration with a maximum total heat transfer rate (Qmax) of 5746.74 W significantly enhances ventilation efficiency in Cave 9 and Cave 10, mitigating weathering and environmental erosion. The approach combined CFD hygrothermal modeling with the beetle antennae search and particle swarm optimization algorithm (BAS–PSO), validated by eXtreme Gradient Boosting (XGBoost) fitting and on-site measurements. This strategy offers an energy-efficient solution for preserving the grottoes, demonstrating the potential of hybrid algorithms in optimizing environmental conditions for heritage sites.
Research Status of the Sculptural Art of the Yungang Grottoes
The Yungang Grottoes, a UNESCO World Heritage Site and one of the world's classical heritage sites, house over 51,000 Buddhist statues with a history spanning more than 1,500 years. These sculptures, dating back to the Xianbei period, hold an irreplaceable position in Mongolia's cultural treasury and represent significant global cultural heritage. Multidisciplinary research integrating archaeology, iconography, and iconology reveals their profound artistic value and historical significance, shedding light on the philosophical, religious, and social structures of their time. This scientific evaluation underscores the grottoes' enduring legacy as a monumental art form with unparalleled depth in both aesthetic and cultural dimensions.
Revitalization Practices of World Cultural Heritage: A Case Study of Yungang Grottoes
Cultural heritage, when influenced by consumerism, transforms into market-driven public history, expanding its value system and enriching historical consumption forms. This study highlights that rational utilization of World Cultural Heritage, such as the Yungang Grottoes, is crucial for sustainable development. It employs qualitative methods—field investigation, observation, and literature analysis—to explore how heritage revitalization can generate diverse social needs while preserving cultural values. The findings offer universal insights applicable to global heritage conservation efforts.
The Seismic Background Noise Monitoring and Intelligent Prediction of the Cave Temple Cultural Heritage—A Case Study of Yungang Grottoes
A high-precision seismic prediction model for cave temples achieves a remarkable fit of 0.99 for environmental vibrations, offering critical technical support for the monitoring and preventive conservation of UNESCO World Heritage Sites like Yungang Grottoes. The TLSA-SO prediction network model, validated using data from Datong's Yungang Grottoes, provides fundamental data to assess seismic risks, develop resistance standards, and create emergency response plans. This study addresses urgent practical and academic needs by addressing the lack of comprehensive cave-earthquake-monitoring systems, which leave such fragile structures vulnerable to irreversible damage.
A Study on Honeysuckle Pattern in Yungang Grottoes From the Perspective of Semiotics
The honeysuckle pattern, a significant Buddhist decorative motif, holds deep semiotic value in the Yungang Grottoes, revealing intricate symbolism and cultural integration. This study deciphers its evolution, classifying patterns and analyzing their signifier-referent systems through semiotic principles. Findings underscore its pivotal role in China's traditional art history, offering new insights into how symbolic motifs encapsulate religious and cultural narratives. The research systematically organizes honeysuckle patterns, providing a framework to explore their connotations and development over time.
Analysis of Pigments Unearthed from the Yungang Grottoes Archaeological Excavations
A comprehensive analysis of pigments unearthed from the Yungang Grottoes, a UNESCO World Heritage Site and masterpiece of Buddhist sculpture, reveals distinct pigment compositions across three historical periods: Northern Wei (5th–6th centuries AD), Liao-Jin, and Ming-Qing dynasties. The study identified hematite, vermilion, goethite, malachite, calcium carbonate, lead white, and ivory black in Northern Wei samples, while Liao-Jin samples contained primarily hematite. Ming-Qing pigments included vermilion, minium, atacamite, lead white, and Prussian blue. Using advanced techniques such as portable X-ray fluorescence spectrometry, scanning electron microscopy–energy dispersive X-ray spectroscopy, and confocal Raman microscopy, researchers provided unprecedented insights into the material culture of these grottoes, shedding light on their artistic evolution over centuries.
Digital conservation and research on the Yungang Grottoes
Digital conservation techniques, including high-precision scanning and three-dimensional reconstruction, offer a non-destructive solution for preserving the Yungang Grottoes—a 1,500-year-old UNESCO World Heritage Site. This study demonstrates that digitization can accurately record and restore the physical form of the grottoes while enabling detailed analyses without damaging the original structures. By leveraging virtual reality technology, researchers not only safeguard this significant Buddhist art complex but also make it more accessible to the public. The findings highlight the potential of digital conservation to address threats like natural erosion and human damage, ensuring long-term protection for cultural heritage sites.
Driving mechanisms and hydro‐chemical variation for assessing salt‐induced weathering of sandstone in grotto relics
Salt-induced weathering significantly contributes to the deterioration of sandstone in grotto relics, with calcium sulphate and magnesium sulphate accumulation playing a crucial role. This study reveals that the Ca/Mg molar ratio varies between 0.27 at ambient relative humidity (RHam) and 4.13–18.15 under constant RH conditions, indicating distinct hydro-chemical processes influencing salt weathering. Field observations and laboratory experiments on Yungang Grottoes' sandstone showed that partial immersion led to a notable increase in Na+ and Mg2+ concentrations in groundwater (165 mg/L and 120.7 mg/L, respectively), while SO42− concentration decreased by 322.5 mg/L due to capillary-driven migration. Salt efflorescence formation was linked to wetting–drying and dissolution–crystallization cycles driven by fluctuating environmental conditions, providing critical insights for conservation strategies to mitigate salt damage in heritage sites.
Extraction and restoration of scratched murals based on hyperspectral imaging—a case study of murals in the East Wall of the sixth grotto of Yungang Grottoes, Datong, China
A novel method using hyperspectral imaging significantly enhances the accuracy of extracting and restoring scratched murals, addressing critical challenges in cultural heritage preservation. The study introduces a technique combining Principal Component Analysis (PCA) with a high-pass filter to improve image information, followed by multi-scale bottom hat transformation and Otsu threshold segmentation for precise deterioration extraction. Morphological transformations and connected component analysis further refine the results, while an improved exemplar-based region filling method restores the scratched areas effectively. The approach outperforms other methods in both extraction accuracy and structural integrity preservation, offering a promising solution for virtual restoration of deteriorating murals at UNESCO World Heritage Sites like Yungang Grottoes.
Large Scale and Complex Structure Grotto Digitalization Using Photogrammetric Method: A Case Study of Cave No. 13 in Yungang Grottoes
A breakthrough in high-precision digitalization of large-volume cultural heritage assets has been achieved using photogrammetry and laser scanning, addressing the challenge of millimeter-level accuracy for complex structures. The study demonstrates a method that ensures geometric consistency across entire sites while capturing intricate local details, exemplified by the 3D reconstruction of Cave No. 13 in Yungang Grottoesusing over 280,000 images. This approach resolves issues of large-scale aerial triangulation and maintains color fidelity, setting a new standard for digital preservation of immovable heritage.
Machine learning based prediction for bulk porosity and static elastic modulus of Yungang Grottoes sandstone
A new machine learning model, specifically an Artificial Neural Network (ANN), offers highly accurate predictions for the bulk porosity and static elastic modulus of weathered Yungang Grottoes sandstone. This ANN outperformed other regression models like Multiple Linear Regression (MLR) and Support Vector Regression (SVR) with a coefficient of determination (R²) between 0.9537–0.9641 during testing, demonstrating superior precision and generalization. The model's error margins were minimal—no more than 0.7% for bulk porosity and 0.15 GPa for static elastic modulus—while maintaining a stable performance across training and testing phases. These findings enable faster, more reliable assessments of sandstone weathering degrees, with validated predictions for bulk porosity (7–14%) and static elastic modulus (0.7–1.4 GPa).
The application and impact of digital technology in museum education--taking Shenzhen Museum's special exhibition "The Assemblage of Civilizations - Pingcheng and Yungang Grottoes in the Northern Wei Dynasty" as an example
Digital technology significantly enhances museum education, as demonstrated by Shenzhen Museum's exhibition 'The Assemblage of Civilizations - Pingcheng and Yungang Grottoes in the Northern Wei Dynasty.' The study reveals that integrating digital tools transforms educational concepts, methods, and resource integration, leading to improved effectiveness. By analyzing visitor engagement, learning outcomes, and resource utilization, researchers identified key benefits while addressing challenges such as accessibility and content depth. These findings provide actionable insights for advancing museum education in China, emphasizing the potential of digital innovation in preserving and presenting cultural heritage.
Investigation into the Gaseous SO2 Attack on Sandstone in the Yungang Grottoes
Research reveals that sulfur dioxide (SO2) significantly accelerates the deterioration of sandstone at the Yungang Grottoes, a UNESCO World Heritage Site with over 1500 years of history. The study found that exposure to SO2 under varying humidity and temperature conditions leads to noticeable changes in the stone's luminosity, hue, weight, and chemical composition, including the formation of gypsum. Higher humidity and cyclic temperature fluctuations exacerbate the dissolution of carbonates and hydrolysis of feldspar, increasing ion concentrations like Ca²⁺ and SO₄²⁻ near the surface. These findings highlight the synergistic impact of environmental factors on sandstone decay, offering insights into preservation strategies for such culturally significant sites.
Determination of Water Vapor Transmission Properties of Sandstones in the Yungang Grottoes
Research reveals that water vapor transmission in the sandstone of Yungang Grottoes significantly increases with rising relative humidity due to capillary condensate flow. The study found a strong correlation between diffusion coefficients and open porosity, indicating that weathering processes alter these parameters, contributing to material deterioration. Using the wet-cup method, scientists measured water vapor transmission under varying environmental conditions, uncovering complex microstructural dynamics that affect diffusion paths. These findings highlight the vulnerability of sandstone heritage sites to moisture-induced damage, offering critical insights for conservation strategies.
Infiltration Assessments on Top of Yungang Grottoes by Time-Lapse Electrical Resistivity Tomography
Infiltrated water does not significantly contribute to the weathering process of the Yungang Grottoes, contrary to previous assumptions. Using time-lapse electrical resistivity tomography over a year, researchers tracked rainfall infiltration in shallow soil layers and found that water primarily moves horizontally into nearby gullies rather than vertically into the rock base due to geological constraints. An artificial infiltration experiment confirmed minimal vertical movement, with 10 m³ of water saturating only the top 1.36 meters of soil. This study challenges the role of infiltrated water in grotto weathering and provides critical insights for conservation efforts.
Religious Interpretation of Yungang Grottoes: Blending of Chinese and Western Cultures
Yungang Grottoes, a UNESCO World Heritage Site and a masterpiece of Northern Wei Dynasty grotto art, exemplifies the fusion of Indian Buddhist culture with indigenous Chinese traditions. This study reveals that its unique artistic charm stems from the organic integration of Xianbei cultural elements, showcasing an early form of localized Chinese grotto art. By analyzing statue models, architectural designs, and Buddhist sculptures, researchers demonstrate how Yungang Grottoes reflects a blending of Chinese and Western religious influences, offering new insights into the evolution of grotto culture and China-oriented Buddhism. The findings underscore its significance as both a cultural heritage site and a symbol of multicultural synthesis.
A Study on the Carved Pagoda of Yungang Grottoes in China
Yungang Grottoes, one of China's three major stone grottoes, preserves diverse pagoda carvings that reflect the architectural and artistic evolution of early Buddhist stupas. These carvings, including freestanding external pagodas, internal central pagodas, multi-tiered pagodas, and relief pagodas on walls or door frames, mirror the structural techniques and styles of wooden pagodas prevalent during the Northern Wei Dynasty (5th–6th centuries CE). The study reveals that these pagodas serve as invaluable records of early Chinese Buddhist stupa design, offering insights into both the development of stone pagoda craftsmanship and the influence of wooden prototypes from Korea. By analyzing carving techniques, stylistic features, and spatial arrangements, researchers have reconstructed the aesthetic and functional characteristics of North Wei-era pagodas, contributing to a deeper understanding of this pivotal period in East Asian Buddhist art.
An adaptive prediction method for mechanical properties deterioration of sandstone under freeze–thaw cycles: a case study of Yungang Grottoes
Researchers have identified that the number of freeze–thaw cycles is the dominant factor influencing the degradation of sandstone mechanical properties at UNESCO World Heritage Site Yungang Grottoes, with porosity playing a minor but notable role. The study introduces an adaptive multi-output gradient boosting decision trees (AMGBDT) algorithm, which outperforms traditional models like neural networks and random forests in predicting how these factors affect rock strength and elasticity. Unlike conventional methods, AMGBDT adapts to nonlinear relationships between physical properties and degradation patterns, offering precise insights into the failure mechanisms of sandstone under freeze–thaw conditions. This approach enhances understanding of environmental impacts on cultural heritage preservation.
Dance Forms of the Statues in Yungang Grottoes
Yungang Grottoes, a renowned cluster of grottoes in China, showcase dance forms that reflect the evolution of different historical periods. These dance forms are significant for art development, history research, and cultural exchange between Chinese and Western cultures. The study analyzes the influence of the grottoes' formation and the integration of multiple cultures on their dance forms. By examining the background of the grottoes, this research aims to contribute to the understanding of dance forms in Shanxi's grotto statues and support future dance development in the region.
Research on the Space transformation of Yungang Grottoes Art Heritage and the Design of wisdom Museum from the perspective of digital Humanity
Yungang Grottoes is undergoing a transformation through the integration of digital humanity and advanced 'art + science and technology' approaches. This study proposes a new model for preserving and showcasing art heritage by leveraging big data and information sampling techniques to creatively reinterpret Yungang's artistic materials. The research aims to build a modern sapiential museum that enhances educational functions, offering an upgraded version of how cultural heritage can be experienced in the digital era. By combining spatial analysis with innovative design strategies, this approach seeks to redefine the presentation and promotion of art heritage for contemporary audiences.
Similarity Index Based Approach for Identifying Similar Grotto Statues to Support Virtual Restoration
A novel similarity index approach successfully identifies similar grotto statues, offering objective quantitative analysis for virtual restoration. By analyzing 11 small Buddhist statues from the Yungang Grottoes using orthophoto images and pHash hash values, researchers developed a method that correlates with visual inspection and 3D point cloud data. This technique overcomes traditional subjective expert judgments, providing accurate initial screening to support repair and reconstruction efforts for damaged heritage statues.
Mechanical Properties of Weathered Feldspar Sandstone after Experiencing Dry‐Wet Cycles
Salt crystallization significantly accelerates the deterioration of feldspar sandstone, with weathering effects up to 73% more severe than water alone. The study subjected Yungang Grottoes' stone to dry-wet cycles, revealing that salt-weathering (Group B) caused peak strength losses of 72.39%, while water exposure (Group A) resulted in a 48.53% decline. Surface roughness increased by up to 3.34 µm under salt conditions, driven by crystallization stress and chemical reactions with minerals like feldspar and calcite. Water-weathering primarily involved hydrolysis of K-Na feldspar and clay mineral swelling. These findings provide critical data for assessing the stability and guiding conservation efforts at the UNESCO-listed Yungang Grottoes.
Microscopic mechanism of sandstone hydration in Yungang Grottoes, China
Research reveals that hydration significantly weakens the mechanical properties of sandstone minerals in Yungang Grottoes, China. Specifically, increasing water molecule exposure reduces the Young's modulus—a measure of stiffness—by up to 55% for key minerals like K-feldspar and Na-feldspar. Additionally, temperature fluctuations further degrade material integrity, with rising temperatures causing volume expansion and density reduction. The study employed molecular mechanics and dynamics simulations to assess microscopic properties (density, volume) and mechanical behavior (Young’s modulus, Poisson’s ratio) of quartz, feldspars, and kaolinite, demonstrating marked anisotropy in their responses. These findings provide critical insights into the degradation mechanisms affecting this UNESCO World Heritage Site, offering a theoretical foundation for conservation efforts.
Nondestructive Testing of Hollowing Deterioration of the Yungang Grottoes Based on THz-TDS
Researchers have developed a reliable, nondestructive method to measure hollowing deterioration in the Yungang Grottoes using terahertz time-domain spectroscopy (THz-TDS). The study established a model correlating hollowing thickness with time differences in THz spectra, achieving an R-squared value of 0.99795, indicating high accuracy. This approach enables both qualitative and quantitative assessment of deterioration without damaging the stone relics, offering significant implications for their preservation and repair. The method's simplicity and effectiveness make it valuable for similar heritage sites.
Sustainable Development of World Cultural Heritage Tourism——Take Yungang Grottoes as an Example
Yungang Grottoes, a UNESCO World Heritage Site renowned for its intricate Buddhist carvings blending Chinese and Western artistic traditions, faces increasing pressure from rising tourism numbers. Research indicates that sustainable development of such cultural heritage sites requires balancing preservation with innovation while engaging stakeholders like governments, institutions, media, citizens, and tourists. The study suggests that integrating protection, utilization, inheritance, and innovation can enhance the site's appeal and promote long-term stability in China's tourism sector. This approach aims to alleviate environmental and operational pressures while improving visitor experiences.
Acid solution decreases the compressional wave velocity of sandstone from the Yungang Grottoes, Datong, China
Acidic solutions significantly degrade the structural integrity of sandstone from the Yungang Grottoes. Research shows that exposure to sulfuric (H₂SO₄) and nitric (HNO₃) acids at increasing concentrations leads to a marked decrease in compressional wave velocity, reduced compressive strength, and increased effective porosity—indicators of microstructural damage. Unlike water treatment, acid exposure alters the sandstone's chemical composition, complicating its structure post-weathering. The study highlights the potential deterioration risk posed by environmental pollutants like SO₂, NOₓ, and PM₂.₅, which form sulfates and nitrates, threatening the preservation of stone relics in the grottoes.
To Achieve Real Immersion: the 3D Virtual and Physical Reconstruction of Cave 3 and Cave 12 of Yungang Grottoes
Researchers successfully achieved the large-scale 3D virtual and physical reconstruction of two caves (Cave 3 and Cave 12) at the UNESCO World Heritage Site, Yungang Grottoes. This breakthrough addresses longstanding challenges in 3D printing for large objects by developing advanced techniques—cascade Structure-from-Motion (SfM), grouped Multi-View Stereopsis (MVS), and automatic texture mapping—to generate high-definition colored models suitable for fabrication. The team also optimized the 3D printing process, post-processing, installation, lacquering, and painting to produce two 10-meter replicas, which have been well-received by audiences. These innovations bridge the gap between digital visualization (e.g., games or VR) and physical replication, offering new possibilities for preserving and showcasing large-scale cultural heritage sites.
A synthetic approach to weathering degree classification of stone relics case study of the Yungang Grottoes
A novel, highly efficient method for classifying the weathering degree of large outdoor stone relics has been developed, with a focus on the UNESCO World Heritage Site Yungang Grottoes. This approach combines terahertz (THz) spectra and ultrasonic velocity measurements, utilizing a least squares support vector machine (LS-SVM) regression model to predict weathering levels with remarkable accuracy—relative errors of 8.16% or less. The method is particularly advantageous for areas where ultrasonic testing is impractical, as it requires only approximately 0.2 grams of sample material to obtain THz spectra. This synthetic approach offers a cost-effective and efficient solution for assessing the weathering of stone relics, advancing conservation efforts for such significant cultural heritage sites.
Analysis on the environment of cultural relic as tourist attraction--take Yungang Grottoes as an example
Balancing cultural heritage protection with sustainable tourism development is critical for sites like the Yungang Grottoes. This study highlights that while tourism drives economic growth and cultural exchange, it also poses significant risks to relic preservation due to environmental pressures and simplistic restoration practices. The research emphasizes the need for coordinated strategies that prioritize both the protection of cultural assets and their sustainable utilization as tourist attractions. By analyzing the Yungang Grottoes, the study underscores the challenges faced by heritage sites in modern urbanization processes, advocating for a more nuanced approach to heritage management that integrates conservation with tourism benefits.
Nondestructive testing of deterioration for Yungang Grottoes based on THz-TDS
Researchers have developed a non-destructive testing method using terahertz time domain spectroscopy (THz-TDS) to accurately assess the hollowing deterioration of Yungang Grottoes. The study demonstrates that this technique can reliably detect and characterize thickness differences in deteriorated samples with high precision, particularly identifying hollowing at 1 mm, 2 mm, and 3 mm intervals using a consistent delay time interval of about 5 ps. By establishing a hollowing thickness model based on the correlation coefficient k, the method offers a practical approach for monitoring surface deterioration without causing damage to the grottoes. This innovation holds significant potential for conservation efforts, enabling targeted repairs and strengthening interventions.
Spectral Characteristics of Chemically Weathered Sandstones in the Yungang Grottoes, China
Reflectance spectroscopy offers a non-destructive method to monitor chemical weathering in sandstones at cultural heritage sites, including the Yungang Grottoes in China. This study identifies distinct spectral absorptions linked to different weathering stages—fresh, calcite-dissolved, and argillitic-altered—using specific wavelengths (e.g., 490, 675, 900 nm for hematite; 2330 nm for calcite). Calcite dissolution reduces absorption at 2330 nm, while argillic alteration diminishes hematite-related peaks. Shifts in kaolinite-related absorptions (1410, 2205, 2350, 2380 nm) correlate with increasing kaolinite content. These findings demonstrate spectroscopy's potential for long-term weathering monitoring, aiding heritage conservation and environmental policy.
Dynamic responses of a grotto under strong earthquake, Yungang Grottoes, Shanxi province, China
A study on the Yungang Grottoes, a renowned UNESCO World Heritage Site and ancient Chinese Buddhist temple complex, reveals that thin rock layers between grottoes experience rhythmic displacement during strong earthquakes. The research, using 3-D finite element modeling of the 19th grotto's west ear-grotto, found that peak ground acceleration (PGA) can be amplified up to 130 times in certain regions, particularly where the roof of the ear-grotto meets the upper rock mass—a zone prone to collapse. This critical insight underscores the structural vulnerability of these heritage sites during seismic events, emphasizing the need for targeted preservation strategies.
Spectroscopy study of Yungang Grottoes weathered material in terahertz range
A spectroscopy study using terahertz time domain spectroscopy (THz-TDS) reveals distinct spectral characteristics of weathered material samples from the Yungang Grottoes. The research identifies that transmission coefficients are high at low frequencies but decrease at higher frequencies across all three sampled caves, dated A.D. 484, A.D. 494, and A.D. 520. Notably, the absorption coefficient increases exponentially with frequency, a trend more pronounced in samples from later periods. The study also highlights significant differences in refractive indices (1.53, 1.57, and 1.51) among the caves, enabling differentiation based on their weathering patterns. These findings provide critical optical constants for Yungang Grottoes materials, offering valuable insights for further studies.
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