*Yasushi Fukamachi¹, Daisuke Simizu², Kay I. Ohshima¹, Hajo Eicken³, Andrew R. Mahoney³, Katsushi Iwamoto⁴, Erika Moriya⁵, Sohey Nihashi⁶ (1.Hokkaido University, 2.National Institute of Polar Research, 3.University of Alaska Fairbanks, 4.City of Mombetsu, 5.Hydro Systems Development, Inc., 6.National Institute of Technology, Tomakomai College)