Assessing hydrologic impact of climate change in Jeju Island using multiple GCMs and watershed modeling

Chul Gyum Kim; Jaepil Cho; Nam Won Kim

doi:10.3741/JKWRA.2018.51.1.11

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Assessing hydrologic impact of climate change in Jeju Island using multiple GCMs and watershed modeling 다중 GCM과 유역모델링을 이용한 기후변화에 따른 제주도의 수문학적 영향 평가

31 January 2018. pp. 11-18

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Abstract

The climate change impacts on hydrological components and water balance in Jeju Island were evaluated using multiple climate models and watershed model, SWAT-K. To take into account the uncertainty of the future forecast data according to climate models, climate data of 9 GCMs were utilized as weather data of SWAT-K for future period (2010-2099). Using the modeling results of the past (1992-2013) and the future period, the hydrological changes of each year were analyzed and the precipitation, runoff, evapotranspiration and recharge were increasing. Compared with the past, the change in the runoff was the largest (up to 50% increase) and the evapotranspiration was relatively small (up to 11% increase). Monthly results show that the amount of evapotranspiration and the amount of recharge are greatly increased as the amount of precipitation increases in August and September, while the amount of evapotranspiration decreases in the same period. January and December showed the opposite tendency. As a result of analyzing future water balance changes, the ratio of runoff, evapotranspiration, and recharge to rainfall did not change much, but compared to the past, the runoff rate increased up to 4.3% in the RCP 8.5 scenario, while the evapotranspiration rate decreased by up to 3.5%. Based on the results of other researchers and this study, it is expected that rainfall and runoff will increase gradually in the future under the assumption of present climate change scenarios. Especially summer precipitation and runoff are expected to increase. As a result, the amount of groundwater recharge in Jeju Island will increase.

Keywords

Climate change

Jeju Island

Water balance

GCM

SWAT-K

본 연구에서는 다중 기후모델에 의한 미래 기후자료를 기반으로 SWAT-K 유역모형을 적용하여, 제주도 지역의 미래 기후변화에 따른 수자원 영향을 평가하였다. 기후모델에 따른 미래 전망자료의 불확실성을 고려하여 9개의 GCM 모델의 기후자료를 미래기간(2010~2099년)에 대한 SWAT-K 모형의 기상자료로 적용하였다. 과거(1992~2013년) 및 미래기간에 대한 연도별 수문변화를 분석한 결과 강수량, 유출량, 증발산량, 함양량 모두 증가하는 추세로 나타났다. 과거기간에 비해 유출량의 변화가 가장 크게 나타났으며(최대 50% 증가), 증발산량은 상대적으로 작게 나타났다(최대 11% 증가). 월별로는 8월과 9월의 강수량 증가에 따라 유출량과 함양량도 크게 증가하는 반면, 동일기간에 대한 증발산량은 감소하는 것으로 분석되었다. 1월과 12월은 반대의 경향이 나타났다. 미래의 물수지 변화를 분석한 결과 강수량 대비 유출량, 증발산량, 함양량의 비율은 변화가 크지 않으나, 과거와 비교했을 때 RCP 8.5 시나리오에서 유출량 비율은 최대 4.3% 증가하는 반면, 증발산량 비율은 최대 3.5% 감소하는 것으로 나타났다. 기존의 타 연구와 본 연구에서 도출한 결과를 종합해 볼 때, 현재 제시되고 있는 기후변화 시나리오 가정 하에서는 미래로 갈수록 점차 강수량과 유출량이 증가할 것이고 특히 여름철 강수량 및 유출량의 증가가 예상된다. 이로 인해 제주도 지역의 함양량도 함께 증가할 것으로 판단할 수 있다. 다만, 본 연구는 장기적인 측면에서 자연적인 기후변화로 인한 영향을 분석한 것이며, 추가적으로 단기적인 수재해 대응을 위한 홍수와 가뭄관리, 인위적인 용수 수급 관리 등에 대한 종합적인 분석을 통해 제주도 수자원의 지속가능한 이용을 위한 대응방안이 필요하다고 판단된다.

키워드

기후변화

제주도

물수지

GCM

SWAT-K

References

Arnold, J. G., Allen, P. M., and Bernhardt, G. (1993). “A comprehensive surface-groundwater flow model.” Journal of Hydrology, Vol. 142, pp. 47-69.

Chung, I. M., Lee, J., Kim, J. T., Na, H., and Kim, N. W. (2011). “Development of threshold runoff simulation method for runoff analysis of Jeju Island.” Journal of the Environmental Sciences, Vol. 20, No. 10, pp. 1347-1355.

Jeju Province and Korea Water Resources Corporation (KOWACO) (2003). Comprehensive investigation of hydrogeology and groundwater resources in Jeju Island (Ⅲ). Jeju Province.

Jeju Special Self-Governing Province (JSSGP) (2013). The water management comprehensive plan for Jeju Special Self-Governing Province (2013-2022).

Kang, J. Y. (2011). “Establishment and task of detailed implemen-tation plan of adaptation to climate change in Jeju region.” Jeju Development Forum, Vol. 38, pp. 110-116.

Kim, C. G., and Kim, N. W. (2016). “Evaluation and complementation of observed flow in the Hancheon watershed in Jeju Island using a physically-based watershed model.” Journal of Korea Water Resources Association, Vol. 49, No. 11, pp. 951-959.

Kim, C. G., and Kim, N. W. (2017). “Estimation and evaluation of irrigation water need using net water consumption concept in Jeju Island.” Journal of Korea Water Resources Association, Vol. 50, No. 7, pp. 503-511.

Kim, N. W., Chung, I. M., and Na, H. (2013). “A method of simulating ephemeral stream runoff characteristics in Cheonmi-cheon watershed, Jeju Island.” Journal of Environmental Science International, Vol. 22, No. 5, pp. 523-531.

Kim, N. W., Chung, I. M., Yoo, S. Y., and Lee, J. (2009a). “Analysis on the groundwater usage in Pyoseon area by using the integrated SWAT-MODFLOW model.” Proceedings of the Korea Water Resources Association Conference, pp. 1939-1944.

Kim, N. W., Um, M. J., Chung, I. M., and Heo, J. H. (2012). “Estimating the total precipitation amount with simulated precipitation for ungauged stations in Jeju Island.” Journal of Korea Water Resources Association, Vol. 45, No. 9, pp. 875-885.

Kim, Y. C., Moon, D. C., and Kim, Y. J. (2009b). “Analysis of flood runoff characteristics of Hancheon in Jeju Island for ground-water artificial recharge.” Water for Future, Magazine of Korea Water Resources Association, Vol, 42, No. 11, pp. 19-24.

Koh, G. W., Park, W. B., and Moon, S. H. (2014). “The direction of managing the water resources of Jeju Island in response to climate change.” Jeju Development Research, Vol. 12, pp. 27-55.

Korea Institute of Construction Technology (KICT) (2007). Develop-ment of analysing system for sustainable water hydrological components. Sustainable Water Resources Research Program of 21st Century Frontier R&D Program, Ministry of Science and Technology.

Korea Water Resources Corporation (KOWACO) (1993). Establishment of comprehensive development plan for water resources in Jeju Province.

Lee, J. H., Yang, S. K., Yang, W. S., and Lee, G. B. (2016). “Runoff analysis of climate change scenario in Gangjung basin.” Proceedings of the Korea Water Resources Association Conference, pp. 539-543.

Ministry of Land, Transport and Maritime Affairs (MLTMA) (2011). The long-term comprehensive plan for water resources (2011- 2020).

Park, J. C., Cho, K. J., and Song, S. H. (2014). “Prediction of regional drought considering aspect and elevation in Jeju Island under future climate change.” Journal of Environmental Science International, Vol. 23, No. 4, pp. 649-660.

Seo, J., Kim, Y., Moon, D., Koh, K. W., and Kim, Y. (2014). “Evaluation of surface infiltration rate in Hancheon reservoir, Jeju Island, Korea.” Journal of the Geological Society of Korea, Vol. 50, No. 3, pp. 419-430.

Information

Publisher :KOREA WATER RESOURECES ASSOCIATION
Publisher(Ko) :한국수자원학회
Journal Title :Journal of Korea Water Resources Association
Journal Title(Ko) :한국수자원학회 논문집
Volume : 51
No :1
Pages :11-18
Received Date : 2017-10-13
Revised Date : 2017-11-13
Accepted Date : 2017-11-13
DOI :https://doi.org/10.3741/JKWRA.2018.51.1.11

Journal of Korea Water Resources Association ISSN:2799-8746(Print) 2799-8754(Online) 한국수자원학회 논문집

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