GRACE

Validation of algorithms for estimating changes in groundwater storage from GRACE gravity satellite data for Poland

The development of satellite technologies creates more and more opportunities to build modern tools for monitoring the state of groundwater. The use of the GRACE satellites to monitor GWS changes has become widespread, but the degree of accuracy with which remote sensing data can estimate these changes is unclear. In this study, we quantified changes in the GWS in Poland from 2009 to 2022 using GRACE observations, in-situ data, and GLDAS. Long-term trends and seasonality were calculated and analysed for each time series.

Can open-source remote sensing data be used to accurately downscale groundwater storage estimates?

The lack of reliable groundwater level monitoring data hinders the comprehensive understanding and sustainable management of our aquifers. New remotely sensed data products could present novel possibilities to fill in situ data gaps. For example, continuous monthly groundwater storage anomaly estimates at a spatial resolution of 0.25° (28 km) are made available through the Global Data Assimilation System Version 2.2 (GLDAS-2.2) data products that assimilate Gravity Recovery and Climate Experiment (GRACE) data.

Using Gravity Anomalies from Grace to Estimate Changes in Groundwater Storage In The Vaal River Basin

The Gravity Recovery and Climate Experiment satellites detect minute temporal variation in the earth’s gravitational field at an unprecedented accuracy, in order to make estimation of the total water storage (TWS). GRACE provides a unique opportunity to study and monitor real time water variation in the hydrologic stores( snow, groundwater, surface water and soil moisture) due to increase or decrease in storage.

Applications of Satellite Based Techniques in Monitoring Water Storage in the Vaal River Basin, South Africa

The demand for water continues to increase despite water shortages in the already over stressed Vaal River Basin. The Vaal River supplies water to the major metropolitan cities of Johannesburg and Tshwane. Water shortage threatens food security and the economic expansion of the country and it is unclear if there will be sufficient water to meet future water demands in the Vaal River Basin.

Evaluating changes in groundwater storage during the 2015-2018 drought in the Western Cape using GRACE data

The frequency, intensity, and duration of droughts are increasing globally, putting severe pressure on water supply systems worldwide. The Western Cape Province suffered from a period of severe water shortages that began around January 2015 and lasted until about July 2018. During this recent drought, there was a forced reduction in water use, predominantly from the agricultural sector. Citizens also reduced water use and increasingly tapped into groundwater for their needs irrespective of whether the hydrogeology was considered favourable or not.

Groundwater monitoring of South Africa through numerical model

Monitoring groundwater storage is conducted in the study. World Health Organisation estimates, about 55 million people affected by drought yearly. However, Surface water holds 0.3 percent of the freshwater, and groundwater holds 30.1 percent of the freshwater. Hence, monitoring groundwater storage is vital.

Exploring The Potential Of The GRACE Derived Groundwater Drought Index (GGDI) To Forecast Groundwater Drought In South Africa

Water has been recognized and acknowledged as a fundamental natural resource that sustains environmental diversity, social and economic development (Liu et al., 2017; Fisher et al., 2017). With increasing populations, climate change and limited monitoring networks for both ground and surface water, freshwater resources are becoming difficult to assess due to rapid changes in water supply and uses. Several efforts have been devoted towards the monitoring and management of water resources and discovery of alternative sources of freshwater.

Event Debrief: GWD Talk on Estimating Groundwater Storage changes using GRACE derived data in the Vaal River Basin

13 May 2021
Elanda
SACNASP CPD EVENT "Thank you for this mind-boggling presentation" Mr Kwazi Majola (Gauteng Branch Chair) thanked Dr Khuliso Masindi after he shared with attendees on latest GRACE research results.
Home News Event Debrief: GWD Talk on Estimating Groundwater Storage changes using GRACE derived data in the Vaal River Basin
SACNASP CPD EVENT "Thank you for this mind-boggling presentation" Mr Kwazi Majola (Gauteng Branch Chair) thanked Dr Khuliso Masindi after he shared with attendees on latest GRACE research results.