熱帯泥炭湿地林域の地下水環境へ及ぼす気候変動の影響評価と排水路管理方策の検討

Abstract

In 1980s, 'Mega Rice Project' for expanded agricultural production was planned inIndonesia, and many drainage canals have been constructed for irrigation and drainageof tropical swamp peatland in Kalimantan Island. However, as the result of groundwaterlevel drawdown in the drained swamp peat-land, huge amount of carbon dioxide wasemitted by forest fires and soil degradations.In this area, it is expected that precipitation, temperature and rainy season period willchange in the future and that will affect the groundwater level. In order to evaluate theeffect of climate change quantitatively, in this study, two-dimensional groundwater flowmodel related with river flow and land surface process was integrated. Results ofgroundwater level simulation suggest the conservation of the hydrological environmentand CO2 emission reduction in tropical swamp peatland by canal water levelmanagement, fire fighting and tree planting.