대한지리학회지 (Journal of the Korean Geographical Society)

대한지리학회 (The Korean Geographical Society)
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반구대 암각화의 주기적인 침수와 구성암석의 풍화 특성

Periodic Immersion of the Bangudae Petroglyphs and Rock Weathering Characteristics

  • 황상일 (경북대학교 지리학과) ;
  • 박경근 (경북대학교 지리학과) ;
  • 윤순옥 (경희대학교 지리학과 및 기초과학연구소)
  • Hwang, Sang-Ill (Department of Geography, Kyungpook National University) ;
  • Park, Kyung-Geun (Department of Geography, Kyungpook National University) ;
  • Yoon, Soon-Ock (Department of Geography and Research Institute for Basic Sciences, Kyung Hee University)
  • 투고 : 2010.04.05
  • 심사 : 2010.06.16
  • 발행 : 2010.06.30
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초록

반구대 암각화는 울산광역시 울주군 언양읍 대곡리 반구동에 위치하며, 1995년 국보 제285호로 지정되었다. 1965년 사연댐 건설 이후 연중 수개월 정도 침수되면서 수분에 의한 풍화작용으로 암각화가 훼손되는 것에 대해 많은 논쟁이 있었다. 본 연구는 반구대 암각화 기반암의 수분등치선도를 작성하여 절리나 박락(剝落) 분포와의 관계를 검토하였다. 반구대 암각화의 함수율은 전체적으로 상부에서 하부로 갈수록 높았다. 이것은 침수된 기간의 길이와 관계된 것이다. 그리고 절리 밀도가 높은 암각화의 상부도 함수율이 높았다. 암석 내 흡수율이 증가하면 투수계수와 공극률이 증가하므로 함수율은 증가한다. 침수로 인해 암석 내에 공극들이 주기적으로 물로 포화되는 반구대 암각화는 수분에 의한 풍화로 훼손이 매우 심각한 상태이다.

The Bangudae Petroglyphs locate at Bangudong, Daegok-ri, Eonyang-eup, Ulju-gun, Ulsan and was designated as the No. 285 national treasure since 1995. After the construction of Sayeon-dam in 1965, there were many controversies of the rock weathering problems by the periodic immersion for approximately a few months. The isopleths of water content on the rock are drawn and the result shows relationships between the isopleths and distribution of joints or exfoliations. The distributions of water content rates in the Petroglyphs show the downward increasing pattern. This may suggest that the rates of water content are further influenced by the duration of immersion. Also, the upper part of the Petroglyphs with dense joints shows high rates of water content. If the water content rates in rocks increase, the water absorption rates increase too, because of the increasement of coefficient of permeability and porosity. The weathering damages of the Petroglyphs in which the pores are saturated by the periodic immersion are in the critical conditions.

키워드

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