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Channel Migration of Byeongmun River Caused by Roof Collapse of Gurin Cave in Mount Halla, Jeiu Island  

Kim, Tae-Ho (Department of Geography Education, Educational Research Institute, Cheju National University)
An, Jong-Gi (Team of Environmental Geology, KRC Jeju Province Office)
Publication Information
Journal of the Korean Geographical Society / v.43, no.4, 2008 , pp. 466-476 More about this Journal
Abstract
Gurin Cave, 442 m long, is a lava tube developed on the northern slope of Mount Halla. Seventy-three meters of its lower reach became a river channel since Byeongmun River flowed into a window after roof collapse took place. The subterranean channel has a width of 447 cm and a height of 501 cm, respectively. Its banks show well-developed lava shelves of a typical lava tube, while its floor has sculpted forms which characterize a bed of a bedrock stream. The reach is likely to be collapsed and then has four collapsed windows since its roof has the densely developed testudinal joints and consists of thin lavas with a thickness of 30 to 60 cm. Before the subterranean channel appeared, a ground channel flowed over the cave and joined into a main channel of Byeongmun River at 653 m in altitude. However, the subterranean channel substituted the ground channel since a bed of the ground channel collapsed into the cave. The new channel, flowing through the cave, joined into a main channel at 660 m in altitude. As the drainage area of Byeongmun River expanded upstream the cave, the new channel changed into a main channel. Since floodwater flows down the ground channel as well as the subterranean channel, a distributary stream has temporarily appeared at the collapsed window. Lava tubes are likely to have an affect on the development of river system in Jeiu Island, in that the caves have constantly shown roof-fall.
Keywords
lava tube; roof collapse; channel migration; Gurin Cave; Byeongmun River; Mount Halla;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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