Groundwater storage assessment based on GRACE satellite gravity measurements

The Groundwater Resilience Assessment through iNtegrated Data Exploration for Ukraine (GRANDE-U) team hosted the GRANDE-U GRACE Webinar on Monday, June 30th. Abstract: In the first part of the webinar, we will discuss the predictors used for downscaling GRACE data: precipitation, evapotranspiration, soil moisture, and river runoff. We will explain the sources of these datasets, how to download them from various platforms, and how to perform initial processing. Watch the first part here:    • Data sources used for GRACE data downscali...   The next part will focus on the details of GRACE data — from explaining the nature of the signals recorded by the mission's satellites, through the sources from which GRACE-based terrestrial water storage (TWS) data can be obtained, to their final processing. Watch the second part here:    • GRACE data processing and downscaling   The final part will focus on deriving groundwater storage (GWS) from satellite data. We will explain how to extract the GWS signal from downscaled GRACE TWS data using outputs from the GLDAS model and how to adapt this approach to local hydrogeological conditions by appropriately selecting the accumulation period of GLDAS-derived TWS based on groundwater table depth. Additionally, we will discuss how to estimate GWS from in-situ measurements of groundwater table levels and specific yield data, and how to use these estimates to calibrate and validate satellite-derived GWS. By the end of the webinar, attendees will gain both theoretical and practical insights into combining satellite, model, and in-situ data to predict GWS, which is particularly crucial for transboundary areas and regions with limited groundwater monitoring networks. Tatiana Solovey ([email protected]) is a professor at the Polish Geological Institute. Her research focuses on the water cycle in the groundwater active exchange zone. The most recent achievement is the development a new approach for extracting in the GRACE signal (satellite gravity mission data) the response to changes in groundwater storage, taking into account hydrogeological parameters and hydrodynamic position. As a member of the GRANDE-U team, Tatiana develops methods for forecasting groundwater level and groundwater storage changes in unmonitored transboundary areas using satellite gravimetry and water cycle models.