Présentations Colloques

Session 5.01: Groundwater resources in a world facing climate change
Se-yeong Hamm
Predicting groundwater level of Korea in relation to climate change
Changes in the amount, intensity, frequency and type of precipitation in conjunction with global warming and climate change critically affect groundwater recharge and subsequantly groundwater level fluctuation. South Korea has an area of ~100,000 km2 with mountains over 70% of the total territory and four river basins + the Han River, Nakdong River, Geum River, and Yeongsan-Sumjin River basins + that are divided by mountain ridges. Precipitation in Korea is greatly affected by the complex topography and drainage systems. The mean annual precipitation over the period 2000–2012 was 1416 mm with different amounts for the river basins- 1472 mm in the Yeongsan-Sumjin River basin, 1457 mm in the Han River basin, 1373 mm in the Nakdong River basin, and 1364 mm in the Geum River basin. This study estimated and predicted groundwater level fluctuation with regarding Korea’s regional climate change scenarios as well as The Gravity Recovery and Climate Experiment (GRACE) that is a joint satellite mission of NASA and the DLR for measuring changes in total, column-integrated terrestrial water storage (TWS) from space. Hourly groundwater level data from 334 national groundwater monitoring stations (NGMSs) operated by the Water Resources Management Information System (WAMIS) of the Korea Water Corporation (http- eng main.aspx) were used for the analysis of long-term variation in relation to climate change. For the study, groundwater level change of from 2002 to 2014 was compared with precipitation amount as well as with GRACE data. At the scale of the river basins, a good relationship was found between groundwater level fluctuation and preciptation amount change as well as between groundwater level fluctuation and TWS data from GRACE. Afterwards, the relationships among groundwater level fluctuation and precipitation trend of the RCM scenarios and TWS data were extended to predict gorundwater level change until 2100.
Ref. of Korea