Quantitative modeling of stable isotopes data to delineate aquifer recharge area. Application to the Bromo-Tengger stratovolcano (Indonesia).

摘要: The precise estimation of aquifers' recharge, and location of their recharge area, is mandatory both to preserve (quality) and manage (quantity) groundwater resources. We thus present in this study a methodology aiming at quantitatively assessing and locating aquifer's recharge areas. It combines the use of the stable isotopes local meteoric water line with elevation-dependent groundwater budgets. This methodology is applied to the northern flank of the 2700 m high Bromo-Tengger stratovolcano (East Java, Indonesia). This flank of the volcano recharges a large volcanosedimentary aquifer located at its feets and gives rise to exceptional artesian springs such as" Umbulan", whose discharge is higher than 3500 Ls-1. This spring is used to supply Surabaya city, the second biggest city in Indonesia. The methodology is 3 steps.(i) The local meteoric δ18O gradient is computed from small local springs regularly located …