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Remote sensing-based actual evapotranspiration assessment in a data-scarce area of Brazil: A case study of the Urucuia Aquifer System
International Journal of Applied Earth Observation and Geoinformation ( IF 7.5 ) Pub Date : 2021-01-29 , DOI: 10.1016/j.jag.2021.102298
Bruno César Comini de Andrade , Eber José de Andrade Pinto , Anderson Ruhoff , Gabriel B. Senay

The large groundwater reserves of the Urucuia Aquifer System (UAS) enabled agricultural development and economic growth in the western Bahia State, in northeastern Brazil. Over the last several years, concern has grown around the aquifer’s diminishing water levels, and water balance (WB) studies are in demand. Considering the lack of measured actual evapotranspiration (ETa), a major component of the water cycle, this work uses the Operational Simplified Surface Energy Balance (SSEBop) model to estimate ETa, and compares it to basin-scale estimates from the Soil Moisture Accounting Procedure (SMAP) monthly model and from an annual WB closure method, based on gridded meteorological data and the Gravity Recovery and Climate Experiment (GRACE) product. Additionally, a comparative assessment of different versions of the SSEBop parameterization was performed. Moderate Resolution Imaging Spectroradiometer (MODIS) imagery was used to implement eight different versions of the SSEBop algorithm over the UAS between 2000 and 2013. SSEBop and SMAP ETa yielded similar seasonal patterns, with correlation coefficient (r) up to 0.65, mean difference (MD) of 0.8 mm/month and mean absolute difference (MAD) of 18.5 mm/month. Comparison of SSEBop annual ETa estimates to annual SMAP and WB closure estimates yielded low MD (12.1 and −7.3 mm/year, respectively) and MAD (82.5 and 82.8 mm/year, respectively), but also low r values (0.00 and 0.37, respectively). The comparison of the different SSEBop versions indicated the need to incorporate a calibration step of the aerodynamic heat resistance (rah) parameter. SSEBop results were also used for land cover and drought monitoring. Analysis indicates that agriculture, associated with an increasing trend of atmospheric evaporative demand, is responsible for the decrease in groundwater levels and streamflow in the studied time period.



中文翻译:

巴西数据稀缺地区基于遥感的实际蒸散量评估:以乌鲁库亚含水层系统为例

Urucuia含水层系统(UAS)的大量地下水储备使巴西东北部的巴伊亚州西部的农业发展和经济增长成为可能。在过去的几年中,人们越来越关注含水层水位的下降,因此需要进行水平衡(WB)研究。考虑到缺乏测得的实际蒸散量(ET a)(水循环的主要组成部分),因此这项工作使用了操作性简化表面能平衡(SSEBop)模型来估算ET a。,并将其与基于土壤水分核算程序(SMAP)每月模型和年度WB封闭方法的流域规模估算进行比较,该估算基于栅格化的气象数据和重力恢复与气候实验(GRACE)产品。此外,还对不同版本的SSEBop参数化进行了比较评估。中等分辨率成像光谱仪(MODIS)成像被用于实现八个不同的版本2000年和2013年SSEBop和SMAP ET之间的SSEBop算法在UAS的一个产生了相似的季节性模式,与相关系数(r)高达0.65,平均差异( MD)为0.8毫米/月,平均绝对差(MAD)为18.5毫米/月。SSEBop年度ET a的比较对SMAP和WB年度关闭估算的估计值得出较低的MD(分别为12.1和-7.3 mm /年)和MAD(分别为82.5和82.8 mm /年),但r值也较低(分别为0.00和0.37)。不同SSEBop版本的比较表明需要结合空气动力学耐热性(r ah)参数的校准步骤。SSEBop结果也用于土地覆盖和干旱监测。分析表明,农业与大气蒸发需求的增加趋势有关,是造成所研究时期地下水位和水流量下降的原因。

更新日期:2021-02-01
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