|Timeline:||February 2014 - 3 February 2018|
The driving factors of groundwater resources changes are groundwater abstraction, land use change and climate change. Groundwater abstraction can result to groundwater resource depletion. Changes in land use is mainly changes in vegetation. Vegetation is directly impact on evapotranspiration. Alteration of evapotranspiration influences groundwater condition. Changes in climate alter the amount of groundwater recharge and groundwater pathways in water cycle. Therefore, this research attempts to predict future groundwater resources change in Bali Island due to the combined effects of groundwater abstraction, land use change and climate change, while considering both surface and groundwater interactions within dynamic, integrated hydrological system. GSFLOW integrated groundwater and surface water modeling system will be used for prediction of future groundwater resources.
The main objectives of this research are : a) identify the spatial and temporal variability of rainfall in the period 2000-2010 by merging rain gauge and satellite data; b). assess groundwater resources in quantitative, spatio-temporal manner by calibrating integrated hydrological GSFLOW model within 2005-2010 period, considering groundwater abstraction, land use and climate changes; c). compare evapotranspiration results from integrated hydrological model and from remote sensing solution of surface energy balance system (SEBS); d). forecast future change of groundwater resources in Bali Island until 2030 based on predictions of groundwater abstraction, land use and climate changes all implemented as input in the GSFLOW model.