ABSTRACT
The changes in the various water storages are inevitable, and it is important to understand the scale of such changes. The Gravity Recovery and climate experiment (GRACE’s) terrestrial water storage is column integrated data that includes groundwater, soil moisture, surface runoff, and snowmelt, making it more convenient to analyze the total change in the water availability. This study focuses on calculating the sustainability of the terrestrial water storage using the Reliability-Resiliency-Vulnerability assessment. To calculate that, the GRACE’s TWS data is used to form an index which helps to identify the unique events which otherwise would be difficult to identify due to annual cycle and seasonality. The reliability of this index is considered as the frequency of the satisfactory events, resilience is the capacity to recover from the unsatisfactory event, and vulnerability is the extreme magnitude of the events. Sustainability is calculated as the integration of Reliability, Resiliency, and Vulnerability, and then the spatial distribution is plotted. It helps to identify the changes in the groundwater storage at Punjab and Haryana along with the snowmelt at the Himalayas and surface runoff in the southern peninsular after comparing with the individual hydrological parameter of the Global Land Data Assimilation System (GLDAS) and in-situ groundwater observations.
