An Investigation on the Closure of the Water Budget Methods Over Volta Basin Using Multi-Satellite Data

Ferreira, Vagner G.; Asiah, Zibrila

doi:10.1007/1345_2015_137

Cited by 13 publications

(22 citation statements)

References 32 publications

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“…The two series have a correlation coefficient of 0.71 (p-value 8.71ˆ10´2 6 ) indicating that TWSC follows the rainfall pattern within SFRB. Moreover, rainfall generally bounds TWSC as expected (see, e.g., references [55,63]). 13.55 mm/mo, respectively.…”

Section: Terrestrial Water Storage Deficit Index (Twsdi)supporting

confidence: 76%

Water Availability of São Francisco River Basin Based on a Space-Borne Geodetic Sensor

Sun

Ferreira

et al. 2016

Water

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Brazil has recently experienced one of its worst droughts in the last 80 years, with wide-ranging consequences for water supply restrictions, energy rationing, and agricultural losses. Northeast and Southeast Brazil, which share the São Francisco River basin (SFRB), have experienced serious precipitation reduction since 2011. We used terrestrial water-storage (TWS) fields, inverted from the Gravity Recovery and Climate Experiment (GRACE) mission measurements, to assess and quantify the ongoing drought over the SFRB. We found a water loss rate of 3.30 km 3 /year over the time-span of April 2002 to March 2015. In addition, the TWS drought index (TWSDI) showed the extension of the recent drought that has jeopardized the SFRB since January 2012, and which reached its maximum in July 2015 (the end of TWS time series). In this sense there seems to be a linkage between the TWSDI (wetness/dryness) and the El Niño Southern Oscillation (ENSO), in terms of the wavelet coherence, at the semi-annual and biennial bands, suggesting a relationship between the two. While acknowledging that further investigation is needed, we believe that our findings should contribute to the water management policies by quantifying the impact of this drought event over the SFRB.

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Section: Terrestrial Water Storage Deficit Index (Twsdi)supporting

confidence: 76%

Water Availability of São Francisco River Basin Based on a Space-Borne Geodetic Sensor

Sun

Ferreira

et al. 2016

Water

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“…At a basin scale, irrespective of the size and relative signal amplitude, the solutions all vary from the ensemble mean (composed from CSR, JPL, GFZ, and GRGS) on the order of 10 to 15 mm. 18 Efforts have also been made to assess the GRACE-derived TWSA fields; for example, combining measurements and/or models in the context of the water-budget equations [19][20][21][22][23] or in terms of groundwater estimations. 8,[24][25][26] Additionally, direct comparisons with hydrology models, 27,28 remotely sensed rainfall data, 29,30 and ocean-bottom pressure products 31 have been reported.…”

Section: Introductionmentioning

confidence: 99%

Uncertainties of the Gravity Recovery and Climate Experiment time-variable gravity-field solutions based on three-cornered hat method

Ferreira

Castro

Yakubu

et al. 2016

J. Appl. Remote Sens

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Abstract. Currently, various satellite processing centers produce extensive data, with different solutions of the same field being available. For instance, the Gravity Recovery and Climate Experiment (GRACE) has been monitoring terrestrial water storage (TWS) since April 2002, while the Center for Space Research (CSR), the Jet Propulsion Laboratory (JPL), the GeoForschungsZentrum (GFZ), and the Groupe de Recherche de Géodésie Spatiale (GRGS) provide individual monthly solutions in the form of Stokes coefficients. The inverted TWS maps (or the regionally averaged values) from these coefficients are being used in many applications; however, as no ground truth data exist, the uncertainties are unknown. Consequently, the purpose of this work is to assess the quality of each processing center by estimating their uncertainties using a generalized formulation of the three-cornered hat (TCH) method. Overall, the TCH results for the study period of August 2002 to June 2014 indicate that at a global scale, the CSR, GFZ, GRGS, and JPL presented uncertainties of 9.4, 13.7, 14.8, and 13.2 mm, respectively. At a basin scale, the overall good performance of the CSR was observed at 91 river basins. The TCH-based results were confirmed by a comparison with an ensemble solution from the four GRACE processing centers.

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“…While the area of Lake Volta is widely described as ~8500 km 2 (e.g., [19,37]), the lake in fact shrinks during the dry season and swells during the rainy season [38]. Vanderpuye [39] found a linear relationship between the water level and surface area for Lake Volta.…”

Section: Estimation Of Lake Area Changementioning

confidence: 99%

“…Ndehedehe et al [16] examined space-time characteristics of droughts over the VRB using GRACE data and multiple drought indices. In addition, studies of VRB water balance have been undertaken using a variety of models and data (e.g., [17][18][19]). These studies mainly focus on TWS changes in the VRB, but potential of GRACE gravity measurements to monitor and quantify long-term water storage changes in Lake Volta has not been specifically discussed.…”

Section: Introductionmentioning

confidence: 99%

Long-Term Water Storage Changes of Lake Volta from GRACE and Satellite Altimetry and Connections with Regional Climate

Chen

Wilson

et al. 2017

Remote Sensing

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Satellite gravity data from the Gravity Recovery and Climate Experiment (GRACE) provides a quantitative measure of terrestrial water storage (TWS) change at different temporal and spatial scales. In this study, we investigate the ability of GRACE to quantitatively monitor long-term hydrological characteristics over the Lake Volta region. Principal component analysis (PCA) is employed to study temporal and spatial variability of long-term TWS changes. Long-term Lake Volta water storage change appears to be the dominant long-term TWS change signal in the Volta basin. GRACE-derived TWS changes and precipitation variations compiled by the Global Precipitation Climatology Centre (GPCC) are related both temporally and spatially, but spatial leakage attenuates the magnitude of GRACE estimates, especially at small regional scales. Using constrained forward modeling, we successfully remove leakage error in GRACE estimates. After this leakage correction, GRACE-derived Lake Volta water storage changes agree remarkably well with independent estimates from satellite altimetry at interannual and longer time scales. This demonstrates the value of GRACE estimates to monitor and quantify water storage changes in lakes, especially in relatively small regions with complicated topography.

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An Investigation on the Closure of the Water Budget Methods Over Volta Basin Using Multi-Satellite Data

Cited by 13 publications

References 32 publications

Water Availability of São Francisco River Basin Based on a Space-Borne Geodetic Sensor

Water Availability of São Francisco River Basin Based on a Space-Borne Geodetic Sensor

Uncertainties of the Gravity Recovery and Climate Experiment time-variable gravity-field solutions based on three-cornered hat method

Long-Term Water Storage Changes of Lake Volta from GRACE and Satellite Altimetry and Connections with Regional Climate

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