抄録
With the withdrawal for anthropogenic uses in addition to climatic changes, the sustainability of groundwater resources is under question. Global-scale land surface models commonly used for water resources assessment, however, simplify or completely neglect the groundwater processes making them inapplicable for groundwater resources assessment. In this study, a groundwater representation is implemented into a global-scale LSM, the MATSIRO, enabling it to simulate the major groundwater variables namely, groundwater recharge, water table depth, and low flow. The estimated global groundwater recharge (29900 km3/yr) corresponds well with GSWP-2 mean baseflow (30200 km3/yr). Global distribution of water table depth is found to be mainly controlled by climate and soil properties. The comparison of simulated and observation-based daily flow duration curves in selected global river basins reveals that the simulation of low flow improves significantly with the groundwater representation.
