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Lahar Simulation on Ulleung Island Using Laharz_py Program

Laharz_py 프로그램을 이용한 울릉도 라하르 수치모의

  • Chang, Cheolwoo (Department of Earth Science, Pusan National University) ;
  • Yun, Sung-Hyo (Department of Earth Science Education, Pusan National University)
  • Received : 2017.03.15
  • Accepted : 2017.03.26
  • Published : 2017.03.31

Abstract

A Lahar on the volcanic area is one of the important hazard that can cause the loss of life and property damage. In order to estimate lahar hazard area at Ulleung Island, we simulated lahar inundation area using Laharz_py. We assumed 400 m of additional elevation for DEM to draw proximal hazard zone of Ulleung Island that H/L ratio were selected 0.45 and 0.5. And lahar volumes for simulation were estimated to 30,000, 50,000, 70,000, $100,000m^3$, respectively. In the results, 5 streams are located near a proximal hazard zone, Jeodong (east), Sadong and Okchon (southeast), Namyang (southwest), and Chusan (north), Nari basin is also considered that has a possibility of lahar during downpour. The results of this study can be used as basic data to make a hazard map for reduce the damage that can be caused by volcanic hazards occurred on Ulleung Island.

화산지역에서 발생하는 라하르는 인명과 재산피해를 일으키는 주요 재해이다. 라하르 위험 지역을 산출하기 위하여 본 연구에서는 Laharz_py 프로그램을 사용하여 울릉도에서 발생 가능한 라하르의 영향 지역에 대한 수치모의를 실시하였다. 울릉도의 근위위험지역을 도출하기 위하여 DEM에 400 m의 추가고도를 설정하였고, 이에 따라 H/L비는 0.45와 0.5로 결정하였다. 발생 가능한 라하르의 부피는 30,000, 50,000, 70,000, $100,000m^3$로 설정하였다. 근위위험지역 경계와 인접하여 라하르의 발생 가능성이 있는 하천은 울릉도 동쪽 저동천, 남동쪽 사동천과 옥천천, 남서쪽의 남양천, 북쪽의 용출수인 추산천이며, 집중호우시 나리 분지에서의 라하르 발생 가능성도 고려하여 수치모의를 실시하였다. 본 연구는 울릉도에서 발생 가능한 라하르의 영향 범위에 대한 예측을 통해 화산재해로 인한 인명과 재산 피해를 줄일 수 있도록 재해위험지도를 작성하기 위한 기본 자료로 활용 가능할 것이다.

Keywords

References

  1. Cronin, S.J., Neall, V.E., Palmer, A.S. and Lecointre, J.A., 1997. Changes in Whangaehu river lahar characteristics during the 1995 eruption sequence, Ruapehu volcano, New Zealand. Journal of Volcanology and Geothermal Research. 76, 47-61. https://doi.org/10.1016/S0377-0273(96)00064-9
  2. Decker, R.W. and Decker, B., 1991, Mountains of fire: the nature of volcanoes. Cambridge University press. New York, 199p.
  3. Environmental Systems Research Institute, 2012, ArcGIS: Environmental Systems Research Institute Inc., Redlands, California.
  4. Gerrard, J., 1990, Mountain Environments: An Examination of the Physical Geography of Mountains. MIT Press. 209p. ISBN 978-0262071284.
  5. Hwang, S.K., Hwang, J.H. and Kwon, C.W., 2012, Geological report of the Ulleung Sheet. Korea Institute of Geoscience and Mineral Resources, 84p. (in Korean)
  6. Hwang, S.K. and Jo, I.H., 2016, Risk Analyses from Eruption History and Eruptive Volumes of the Volcanic Rocks in Ulleung Island, East Sea. Economic and Environmental Geology, 49(3), 181-191. (in Korean) https://doi.org/10.9719/EEG.2016.49.3.181
  7. Im, J.H., Shim, S.H., Choo, C.O., Jang, Y.D. and Lee, J.S., 2012, Volcanological and paleoenvironmental implications of charcols of the Nari Formation in Nari Caldera, Ulleung Island, Korea. Geosciences Journal, 16, 105-114. https://doi.org/10.1007/s12303-012-0020-9
  8. Iverson, R.M., Schilling, S.P., and Vallance, J.W., 1998, Objective delineation of areas at risk from inundation by lahars. Geological Society of America Bulletin, 110, 972-984. https://doi.org/10.1130/0016-7606(1998)110<0972:ODOLIH>2.3.CO;2
  9. Jenson, S.K. and Domingue, J.O., 1988, Extracting topographic structure from digital elevation data for geographic information system analysis. Photogrammetric Engineering and Remote Sensing, 54, 1593-1600.
  10. Kim, G.B., Cronin, S.J., Yoon, W.S. and Sohn, Y.K., 2014, Post 19 ka B.P. eruptive history of Ulleung Island, Korea, inferred from an intra-caldera pyroclastic sequence. Bulletin of Volcanology, 76, 802-828. https://doi.org/10.1007/s00445-014-0802-1
  11. Kim, H.J., Lee, K.H., Kim, S.W., Choi, E.K., Yun, S.H., and Kim, S.H., 2014, Scenario based analysis of lahar simulation of Mt. Baekdu using LAHARZ. International Area Studies Review, 18, 243-264. (in Korean) https://doi.org/10.18327/jias.2014.09.18.3.243
  12. National Geographic Information Institute, 2014, Ulleung sheet (1:50,000, NJ 52-9-12).
  13. Newhall, C.G., Hendley II, J.W. and Stauffer, P.H., 1997, Lahars of Mount Pinatubo, Philippines. U.S. Geological Survey Fact Sheet 114-97, http://pubs.usgs.gov/fs/1997/fs114-97/.
  14. Okuno, M., Shiihara, M., Torii, M., Nakamura, T., Kim, K.H., Domitsu, H., Moriwaki., H. and Oda, M., 2010, AMS radiocarbon dating of Holocene tephra layers on Ulleung Island, South Korea. Radiocarbon, 52, 1465-1470. https://doi.org/10.1017/S0033822200046555
  15. Pierson, T.C. and Scott, K.M., 1985. Downstream dilution of a lahar: transition from debris flow to hyperconcentrated streamflow. Water Resources Research, 21, 1511-1524. https://doi.org/10.1029/WR021i010p01511
  16. Quinn, P., Beven, K., Chevallier, P. and Planchon, O., 1991, The prediction of hillslope flow paths for distributed hydrological modelling using digital terrain models. Hydrological Processes, 5, 59-79. https://doi.org/10.1002/hyp.3360050106
  17. Schilling, S.P., 1998, LAHARZ-GIS Programs for automated mapping of lahar-inundation hazard zones. U.S. Geological Survey Open-File Report 98-638, 80p.
  18. Schilling, S.P., 2014, Laharz_py-GIS tools for automated mapping of lahar inundation hazard zones. U.S. Geological Survey Open-File Report 2014-1073, 78p., http://dx.doi.org/10.3133/ofr20141073.
  19. Simute, S., Steptoe, H., Cobden, L., Gokhberg, A., and Fichtner, A., 2016, Full-waveform inversion of the Japanese island region. Journal of Geophysical Research, Solid Earth, 121, 3722-3741.
  20. Vallance, J.W., 2000, Lahars. In Encyclopedia of Volcanoes. (eds. Sigurdsson. H., Houghton, B.F., McNutt, S.R., Rymer, H., and Stix, J.) Academic Press, San Diego, 601-616.
  21. Vallance, J.W., and Iverson, R.M., 2015, Lahars and their deposits. In The Encyclopedia of Volcanoes, second edition (eds. Sigurdsson, H., Houghton, B., Rymer, H., Stix, J., McNutt, S.) Elsevier, Amsterdam, 649-664.
  22. Voight, B., 1990, The 1985 Nevado del Ruiz volcano catastrophe: Anatomy and retrospection. Journal of Volcanology and Geothermal Research, 44, 349-386. https://doi.org/10.1016/0377-0273(90)90027-D
  23. Witham, C., 2005, Volcanic disasters and incidents-a new database. Journal of Volcanology and Geothermal Research, 148, 191-233. https://doi.org/10.1016/j.jvolgeores.2005.04.017
  24. Yun, S.H. and Chang, C.W., 2016, Lahar flow simulation using Laharz_py program: Application for the Mt. Halla volcano, Jeju, Korea. The Journal of the Petrological Society of Korea, 25, 361-372. (in Korean) https://doi.org/10.7854/JPSK.2016.25.4.361