| Project/Area Number |
14404004
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 海外学術 |
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| Research Field |
Geotechnical engineering
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| Research Institution | Osaka University |
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Principal Investigator |
TANIMOTO Chikaosa Osaka University, Global Architecture, Professor, 大学院・工学研究科, 教授 (10109027)
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| Co-Investigator(Kenkyū-buntansha) |
TACHIBANA Eizaburo Osaka University, Architecture, Professor, 大学院・工学研究科, 教授 (80029165)
FURUKAWA Tadatoshi Osaka University, Global Architecture, Assistant Professor, 大学院・工学研究科, 学内講師 (70273597)
IMAI Katsuhiko Osaka University, Global Architecture, Professor, 大学院・工学研究科, 教授 (30301253)
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| Project Period (FY) |
2002 – 2003
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| Project Status |
Completed (Fiscal Year 2003)
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| Budget Amount *help |
¥10,700,000 (Direct Cost: ¥10,700,000)
Fiscal Year 2003: ¥4,300,000 (Direct Cost: ¥4,300,000)
Fiscal Year 2002: ¥6,400,000 (Direct Cost: ¥6,400,000)
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| Keywords | preservation / heritage site / Mogao Cavas / conglomerate / electric resistivity / slope erotion / ground water / dew / 斜面浸食 |
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| Research Abstract |
Young porous bedding rocks such as Eocene limestone at the Great Sphinx site and Pleistocene conglomerate at the Mogao Grottos are weathered and eroded rapidly by recrystallization of salt, slaking and wind activity. In order to contribute to the preservation work for natural stone monuments the investigators clarified the transport of water and moisture through porous media and fissures by monitoring evapotranspiration action in situ. Hydrogeological feature at heritage sites can be analyzed by geological and micro-climatic survey and remote sensing with satellite images. The electric resistivity measure could be applied well to both Giza and Dunhuang in aridity and provided the reasonable distribution of moisture content.
Magao Grottos are located at the eastern foot of the Mingsha Dunes, 25km southeast of Dunhuang Town. It faces east toward Sanwei Mountain, and Daquan River runs in front of it.
The caves were excavated into the cliff on the west bank of the Daquan River. The strata in which the caves were excavated are the alluvial and pluvial Jiuquan conglomerate in which there is argillaceous and calcareous cementation. The wall paintings in the caves are subject to the severe deterioration generated by recrystallization of salt. It relates with the movement of water/moisture in rock formation. The basement of Mogao Area consists of granite and gneiss formed in the Pre-Cambrian Age. Through the satellite image analysis and geological survey, it has been clarified that the movement of ground water is governed by the fault system and the geographical nature is specified by the aggressive tectonic movement from the south.
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