The 2019–2020 Rise in Lake Victoria Monitored from Space: Exploiting the State-of-the-Art GRACE-FO and the Newly Released ERA-5 Reanalysis Products

Khaki, Mehdi; Awange, Joseph

doi:10.3390/s21134304

Cited by 28 publications

(17 citation statements)

References 56 publications

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“…nasa. gov/ data/ imerg) in the Nile basin (Khaki and Awange 2021). Major trends of both TWSA and precipitation are visible in the first PCs with a strong positive anomaly in Aril 2019.…”

Section: Signal Separationmentioning

confidence: 98%

“…Joint assimilation of GRACE TWSA and surface soil moisture has the potential to simultaneously improve GW and soil moisture estimates (Tangdamrongsub et al 2020). Khaki and Awange (2021) jointly assimilated GRACE TWSA and lake levels of Lake Victoria derived from satellite altimetry into the World-Wide Water Resources Assessment Model (W3RA) and show detailed patterns of water storage evolution in different compartments with focus on an extreme water storage increase during the period 2019-2020. Li et al (2019) provided a detailed study on the benefits and challenges of GRACE data assimilation for GW and drought monitoring on a global scale and identified major problems in regions with intensive GW abstraction.…”

Section: Merging Data Setsmentioning

confidence: 99%

“…Furthermore, Carvalho Resende et al ( 2019) confirmed the impact of ENSO in Southern Africa and the impact of IOD in Eastern Africa. The IOD can also be related to an exceptional increase of water in various storage compartments, including GW storage, in the region of Lake Victoria during the years 2019 and 2020 (Khaki and Awange 2021). In fact, the response of aquifer systems to climate modes depends primarily on the hydraulic memory, i.e., the hydraulic response time to anomalous precipitation (Opie et al 2020).…”

Section: Separating Drivers Of Groundwater Trendsmentioning

confidence: 99%

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The Role of Space-Based Observations for Groundwater Resource Monitoring over Africa

et al. 2023

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Africa is particularly vulnerable to climate change impacts, which threatens food security, ecosystem protection and restoration initiatives, and fresh water resources availability and quality. Groundwater largely contributes to the mitigation of climate change effects by offering short- to long-term transient water storage. However, groundwater storage remains extremely difficult to monitor. In this paper, we review the strengths and weaknesses of satellite remote sensing techniques for addressing groundwater quantity issues with a focus on GRACE space gravimetry, as well as concepts to combine satellite observations with numerical models and ground observations. One particular focus is the quantification of changes in groundwater resources in the different climatic regions of Africa and the discussion of possible climatic and anthropogenic drivers. We include a thorough literature review on studies that use satellite observations for groundwater research in Africa. Finally, we identify gaps in research and possible future directions for employing satellite remote sensing to groundwater monitoring and management on the African continent. Article Highlights Overview on the distribution and characteristics of African groundwater resources including future projections Combination of satellite and in situ observations with numerical models allows us to obtain a synoptic view of groundwater-related processes Summary of current concepts and achievements of satellite remote sensing-based groundwater monitoring and decision making over Africa

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“…nasa. gov/ data/ imerg) in the Nile basin (Khaki and Awange 2021). Major trends of both TWSA and precipitation are visible in the first PCs with a strong positive anomaly in Aril 2019.…”

Section: Signal Separationmentioning

confidence: 98%

Section: Merging Data Setsmentioning

confidence: 99%

Section: Separating Drivers Of Groundwater Trendsmentioning

confidence: 99%

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The Role of Space-Based Observations for Groundwater Resource Monitoring over Africa

et al. 2023

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“…These variations were assimilated in a hydrological model of the Nile River and consequently improved the surface water simulations, and, by indirect feedbacks, the other components of the model. Consequently, EO data assimilation was used by Khaki and Awange (2021) to understand the 2019-2020 abnormal increase in Lake Victoria's level. In their study, they used satellite altimetry and terrestrial water storage from GRACE-FO to understand and model the effect of large-scale ocean indices of Lake Victoria's hydrology.…”

Section: Understanding Recent Outstanding Events and Possible Future ...mentioning

confidence: 99%

Water Resources in Africa: The Role of Earth Observation Data and Hydrodynamic Modeling to Derive River Discharge

Tarpanelli

Paris²,

Sichangi

et al. 2022

Surv Geophys

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For more than a century, river discharge has been measured indirectly through observations of water level and flow velocity, but recently the number of gauging stations worldwide has decreased and the situation is particularly serious in African countries that suffer more than others from discontinuous and incomplete monitoring. As one of the most vulnerable regions in the world to extreme weather events and global warming, African countries need adequate and reliable monitoring. Decades of available Earth Observations data represent a tool complementary to the hydro-monitoring network and, in recent decades, they have demonstrated their potential, especially for data-poor regions. In this paper, a review of methods for hydrological and hydraulic modeling and for estimating river discharge by the use of satellite data, specifically radar altimetry and optical sensors, is provided, with particular focus on their role in the climate changes monitoring. More emphasis is placed on their relevance on African basins highlighting limits and advantages.

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“…The first two characteristics combined render the lake susceptible to large-scale fluctuations, since there are long-term (multi-year) fluctuations of rainfall that have a significant impact on lake levels and lake outflows. Whereas in 2006 there was a crisis of lake water levels being too low, in 2020 they were too high: villages were flooded because the lake levels had increased to unprecedented heights (Khaki & Awange, 2021).…”

Section: The Water Balance Of Lake Victoriamentioning

confidence: 99%

Lake Victoria water levels declining (2000-2006): the role of absent and uncertain data in a transboundary water controversy

Bosuben¹,

Wehn

Zaag

2022

Water International

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Access to accurate and trusted data for transboundary water management is important but not always sufficiently appreciated. Based on the Lake Victoria water levels decline, this technical note demonstrates that when a water crisis unfolds, tensions can arise because of absence of relevant data and uncertainty over data that are available. These may hamper the process towards agreeing on actions to be taken, thus delaying crisis resolution. This technical note demonstrates the importance of reliable data in a sensitive transboundary water situation. Countries therefore should allocate sufficient resources for adequately monitoring the state of transboundary water resources within their territories.

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The 2019–2020 Rise in Lake Victoria Monitored from Space: Exploiting the State-of-the-Art GRACE-FO and the Newly Released ERA-5 Reanalysis Products

Cited by 28 publications

References 56 publications

The Role of Space-Based Observations for Groundwater Resource Monitoring over Africa

The Role of Space-Based Observations for Groundwater Resource Monitoring over Africa

Water Resources in Africa: The Role of Earth Observation Data and Hydrodynamic Modeling to Derive River Discharge

Lake Victoria water levels declining (2000-2006): the role of absent and uncertain data in a transboundary water controversy

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