Evaluation of groundwater storage monitoring with the GRACE satellite: Case study of the High Plains aquifer, central United States
Evaluation of groundwater storage monitoring with the GRACE satellite: Case study of the High Plains aquifer, central United States
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DOI：
10.1029/2008wr006892
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发表时间：
2009-05
影响因子：
5.4
通讯作者：
G. Strassberg;B. Scanlon;D. Chambers
中科院分区：
文献类型：
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作者：
G. Strassberg;B. Scanlon;D. Chambers
缺水是半干旱地区的一个关键问题;然而，区域地下水监测极为有限。这项研究评估了GRACE卫星监测美国半干旱高平原含水层（面积450，000平方公里）地下水储存量的能力，该含水层受到密集灌溉。GRACE计算的陆地水储量（TWS）与土壤水分（SM）和地下水储量（GWS）的总和高度相关（78个站点的原位测量SM的R = 0.96，Noah陆面模型模拟SM的R = 0.95，均方根差分别为38 mm和36 mm）。根据GRACE TWS减去SM计算的季节性GWS变化与实测GWS（每个季节1000口威尔斯井）之间的相关性也很高（原位SM的R = 0.73，模拟SM的R = 0.72）。SM的变异性主要限于土壤的上2米。与模拟SM相比，模拟SM更有利（R = 0.82）。研究结果表明，利用GRACE重力测量监测TWS和GWS在大的半干旱地区进行密集灌溉的潜力。
Water scarcity is a critical issue in semiarid regions; however, regional groundwater monitoring is extremely limited. This study evaluates the ability of the GRACE satellites to monitor groundwater storage in the semiarid High Plains aquifer, United States (450,000 km2 area), which is subjected to intense irrigation. GRACE‐derived terrestrial water storage (TWS) is highly correlated with the sum of soil moisture (SM) and groundwater storage (GWS) (R = 0.96 for in situ measured SM from 78 stations and R = 0.95 for simulated SM with the Noah land surface model with root‐mean‐square difference of 38 mm and 36 mm, respectively). Correlation between seasonal GWS changes calculated from GRACE TWS minus SM and measured GWS (∼1000 wells per season) is also high (R = 0.73 for in situ SM and R = 0.72 for simulated SM). Variability in SM is mostly restricted to the upper 2 m of the soil. Monitored SM compared favorably with simulated SM (R = 0.82). Study results show the potential for using GRACE gravity measurements to monitor TWS and GWS over large semiarid regions subjected to intense irrigation.