An Improved Approach for Evapotranspiration Estimation Using Water Balance Equation: Case Study of Yangtze River Basin

Li, Qiong; Luo, Zhicai; Zhong, Bo; Zhou, Hao

doi:10.3390/w10060812

Cited by 18 publications

(8 citation statements)

References 52 publications

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“…Currently, there are many available global precipitation (P) data and evapotranspiration (ET) models (gauge-based, satellite-related, and reanalysis datasets) from different organizations (Sun et al, 2018). The mainstream land surface models (Chen et al, 2020;Jing et al, 2019;Li et al, 2018;Martin et al, 2020;Zhang et al, 2016) include the Global Land Data Assimilation System (GLDAS), Global Precipitation Climatology Project (GPCP), GLEAM (Global Land Evaporation Amsterdam Model), and ERA5 models. One reason for the popularization of these models is that these models merge various satellite-based estimates over both ocean and land with gauge measurements.…”

Section: Hydrological Models and In-situ Datamentioning

confidence: 99%

“…Currently, most studies on basin-scale water budget closure (Chen et al, 2020;Li et al, 2018;Long et al, 2014;Lv et al, 2017;Syed et al, 2005) benefit from the Gravity Recovery and Climate Experiment (GRACE) mission. The GRACE-derived terrestrial water storage change (TWSC) represents residual water storage variation, including natural water supply and loss, and TWSC is regarded as a perfect fit for water budget studies (Rodell and Famiglietti, 1999).…”

Section: Introductionmentioning

confidence: 99%

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Runoff Variations in the Yangtze River Basin and Sub-basins based on GRACE, Hydrological models, and In-situ data

Rao¹,

Sun²

2022

Earth and Planetary Physics

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Water budget closure is a method to study the balance of basin water storage and the dynamics of hydrological components (e.g., precipitation, evapotranspiration, and runoff). When the water budget closure is connected with terrestrial water storage change (TWSC) estimated from the Gravity Recovery and Climate Experiment (GRACE) data, the variations in the basin runoff can be well researched. In this study, the total runoff variations in the Yangtze River Basin (YRB) and its sub-basins are studied in detail based on the water budget closure equation. The mainstream precipitation and evapotranspiration models were compared and combined to determine the interval of precipitation minus evapotranspiration. In addition, generally neglected human water consumption is discussed and considered here. The final estimated runoff variations in the YRB and its sub-basins were compared with in-situ discharge variations to evaluate the application effect of these hydrological models and estimate the subsurface runoff. The estimated runoff variations show that runoff over the YRB showed an increasing trend, especially in the lower sub-basins and in the post-monsoon season, accompanied by apparent terrestrial water loss.

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Section: Hydrological Models and In-situ Datamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Runoff Variations in the Yangtze River Basin and Sub-basins based on GRACE, Hydrological models, and In-situ data

Rao¹,

Sun²

2022

Earth and Planetary Physics

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“…TWSC is estimated as the temporal derivative of TWSA from the GRACE products [37,38]. ET, P, and Q are the cumulated amount in a full month [4,39]. Then ds/dt (TWSC) is the differential of two consecutive months of TWSA at the beginning of a month.…”

Section: Water Balance Equationmentioning

confidence: 99%

Evaluation of Evapotranspiration for Exorheic Catchments of China during the GRACE Era: From a Water Balance Perspective

Zhong

Mao

et al. 2020

Remote Sensing

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Evapotranspiration (ET) is usually difficult to estimate at the regional scale due to scarce direct measurements. This study uses the water balance equation to calculate the regional ET with observations of precipitation, runoff, and terrestrial water storage changes (TWSC) in nine exorheic catchments of China. We compared the regional ET estimates from a water balance perspective with and without considering TWSC (ETWB: ET estimates with considering TWSC, and ETPQ: ET estimates from precipitation minus runoff without considering TWSC). Results show that the regional annual ET ranges from 417.7 mm/yr to 831.5 mm/yr in the nine exorheic catchments based on the water balance equation. The impact of ignoring TWSC on calculating ET is notable, as the root mean square errors (RMSEs) of annual ET between ETWB and ETPQ range from 12.0–105.8 mm/yr (2.6–12.7% in corresponding annual ET) among the exorheic catchments. We also compared the estimated regional ET with other ET products. Different precipitation products are assessed to explain the inconsistency between different ET products and regional ET from a water balance perspective. The RMSEs between ET estimates from Gravity Recovery and Climate Experiment (GRACE) and ET from land surface models can be reduced if the deviation of precipitation forcing data is considered. ET estimates from Global Land Evaporation Amsterdam Model (GLEAM) can be improved by reducing the uncertainty of precipitation forcing data in three semiarid catchments. This study emphasizes the importance of considering TWSC when calculating the regional ET using a water balance equation and provides more accurate ET estimates to help improve modeled ET results.

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“…Since the implementation of these two missions, their spherical harmonic (SH) coefficient and Mascon solutions have been widely used to detect the spatial and temporal variations of TWS in large-scale regions, especially the regions where the hydrometeorological ground stations are scarce [18]. In addition, GRACE TWSC data have been extensively used in flood and drought evaluations [18][19][20], hydrological component estimation (e.g., runoff, ET, groundwater storage change) [21][22][23], and glacier melting monitoring [24,25]. Some scholars have used GRACE data to study the relationship between regional TWSC and natural factors and human activities [16,26,27].…”

Section: Introductionmentioning

confidence: 99%

Natural- and Human-Induced Influences on Terrestrial Water Storage Change in Sichuan, Southwest China from 2003 to 2020

Cui

Zhu

et al. 2022

Remote Sensing

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A quantitative understanding of changes in water resources is crucial for local governments to enable timely decision-making to maintain water security. Here, we quantified natural-and human-induced influences on the terrestrial water storage change (TWSC) in Sichuan, Southwest China, with intensive water consumption and climate variability, based on the data from the Gravity Recovery and Climate Experiment (GRACE) and its Follow-on (GRACE-FO) during 2003–2020. We combined the TWSC estimates derived from six GRACE/GRACE-FO solutions based on the uncertainties of each solution estimated from the generalized three-cornered hat method. Metrics of correlation coefficient and contribution rate (CR) were used to evaluate the influence of precipitation, evapotranspiration, runoff, reservoir storage, and total water consumption on TWSC in the entire region and its five economic regions. The results showed that a significant improvement in the fused TWSC was found compared to those derived from a single model. The increase in regional water storage with a rate of 3.83 ± 0.54 mm/a was more influenced by natural factors (CR was 53.17%) compared to human influence (CR was 46.83%). Among the factors, the contribution of reservoir storage was the largest (CR was 42.32%) due to the rapid increase in hydropower stations, followed by precipitation (CR was 35.16%), evapotranspiration (CR was 15.86%), total water consumption (CR was 4.51%), and runoff (CR was 2.15%). Among the five economic regions, natural influence on Chengdu Plain was the highest (CR was 48.21%), while human influence in Northwest Sichuan was the largest (CR was 61.37%). The highest CR of reservoir storage to TWSC was in Northwest Sichuan (61.11%), while the highest CRs of precipitation (35.16%) and evapotranspiration (15.86%) were both in PanXi region. The results suggest that TWSC in Sichuan is affected by natural factors and intense human activities, in particular, the effect of reservoir storage on TWSC is very significant. Our study results can provide beneficial help for the management and assessment of regional water resources.

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An Improved Approach for Evapotranspiration Estimation Using Water Balance Equation: Case Study of Yangtze River Basin

Cited by 18 publications

References 52 publications

Runoff Variations in the Yangtze River Basin and Sub-basins based on GRACE, Hydrological models, and In-situ data

Runoff Variations in the Yangtze River Basin and Sub-basins based on GRACE, Hydrological models, and In-situ data

Evaluation of Evapotranspiration for Exorheic Catchments of China during the GRACE Era: From a Water Balance Perspective

Natural- and Human-Induced Influences on Terrestrial Water Storage Change in Sichuan, Southwest China from 2003 to 2020

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