Groundwater storage loss calculation using InSAR and Hydromechanical equations

Sammanfattning

This master thesis investigates groundwater storage loss in the Ararat Valley’s aquifer system, driven by intensive groundwater extraction and associated with subsidence risks. Using both InSAR data and hydromechanical analysis, this research shows coherent aquifer storage changes related to localized changes in ground deformations. Non-compliance with recommended well-spacing has exacerbated stress on the aquifer, resulting in hydrogeologic windows and an expanded cone of depression in the valley. Time series analysis reveals a correlation between water level changes and local subsidence and uplifts, indicating a direct impact of extraction on groundwater storage. However, measurement limitations, including basic piezometric devices and inconsistent sampling intervals, introduce potential biases in the groundwater head time series, affecting dataset reliability. The findings underscore the need for improved monitoring standards, strict adherence to extraction thresholds to prevent further depletion, and the need for a more comprehensive understanding of the geology. This study provides potential insights for developing sustainable groundwater management strategies in the Ararat Valley, with implications for other high-stress aquifer systems.