Takashi HANEISHI, Makoto NAKATSUGAWA and Shun KUDO 1 学生会員 室蘭工業大学大学院 工学研究科(〒050-8585 室蘭市水元町 27-1) 2 正会員 博士(工学) 室蘭工業大学大学院 工学研究科 准教授(〒050-8585 室蘭市水元町 27-1) 3 非会員 室蘭工業大学工学部 建設システム工学科(〒050-8585 室蘭市水元町 27-1) This study aims to clarify the causes of the expansion in alder forest in Kushiro Mire by analyzing the relationships among ground height, groundwater level and vegetation. In recent years, Kushiro Mire has been drying as a result of basin development, including river improvement, and the main

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... etation has been rapidly shifting from reed communities to alder forest. Observation data analysis revealed that the area of alder forest is increasing at locations where the groundwater is -0.4 m or more underground. Groundwater simulation by analysis of observation data and unsteady two-dimensional model analysis indicates that groundwater levels are low at rivers and around former water channels. Because the groundwater level changes are large there, the area of alder swamp forest is expected to continue to expand.