GRACE satellite-based estimation of groundwater storage changes and water balance analysis for the Haihe River Basin

被引：0

作者：

Long D. ^{[1
]}

Yang W. ^{[1
]}

Sun Z. ^{[2
]}

Gui Y. ^{[1
]}

Zhang C. ^{[1
]}

Gui Y. ^{[1
]}

机构：

[1] State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing

[2] College of Earth Science, Chengdu University of Technology, Chengdu

来源：

Shuili Xuebao/Journal of Hydraulic Engineering | 2023年 / 54卷 / 03期

关键词：

GRACE; groundwater storage; Haihe Plain; Mascons; scaling factor; spherical harmonics; water balance;

D O I：

10.13243/j.cnki.slxb.20220743

中图分类号：

学科分类号：

摘要：

The South-to-North Water Diversion and reductions in groundwater withdrawals have changed water supply and use structure and profoundly influenced groundwater storage (GWS) in the Haihe Plain (HP). Reliable monitoring of regional GWS changes serves as a basis for water security and strategic groundwater reserves. Here, we compare different methods of processing GRACE signals and use four GRACE products to estimate changes in total water storage (TWS) in the Haihe River Basin and GWS in the HP from 2003 to 2020. Impact of changes in TWS on evapotranspiration (ET) estimates across the basin is quantified. Results show that the coefficient of determination of GWS changes in the HP retrieved from GRACE JPL Mascons data is highest relative to ground monitoring data. GWS in the HP generally shows a downward trend at three distinct stages, and declining rates from 2003 to 2011, 2012 to 2015 and 2016 to 2020 are estimated to be -2.39±0.13 km3/yr, -7.55±0.53 km3/yr, -3.73± 0.26 km3/yr by GRACE JPL Mascons data. The multi-year average ET (521 mm/yr) without considering changes in TWS differs by up to 10 mm (3.2 km3 /yr) from the multi-year average ET (530 mm/yr) considering changes in TWS. The maximum difference in annual ET with and without considering changes in TWS is about 80 mm/yr (25 km3/yr, 2014). The findings from this study provide the latest understanding of changes in GWS in the HP over the past two decades. © 2023 China Water Power Press. All rights reserved.

引用

页码：255 / 267

页数：12

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