Regional Terrestrial Water Storage Changes in the Yangtze River Delta over the Recent 20 years

IF 3.2 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Solid Earth Pub Date : 2024-07-11 DOI:10.5194/egusphere-2024-1406
Fengwei Wang, Jianhua Geng, Yunzhong Shen, Yanlin Wen, Tengfei Feng
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Abstract

Abstract. Monitoring changes in regional terrestrial water storage (TWS) and groundwater storage (GWS) is important for effectively managing water resources. Here, we investigate the TWS and GWS changes in the Yangtze River Delta using the GRACE/GRACE-FO mascon solutions, GLDAS NOAH models and in situ groundwater level changes from monitoring wells over the period of April 2002 to December 2022. The results show that the regional mean TWS change rate of the entire Yangtze River Delta is 0.62±0.10 mm/year, at 0.47±0.07 mm/year for the GWS component and 0.15±0.08 mm/year for the other components, which includes soil moisture, snow water and surface water change derived from the GLDAS NOAH models. At the basin scale, significant positive trends existed in water storage in Shanghai and Zhejiang Provinces; however, relatively small negative trends existed in Jiangsu and Anhui Provinces, which was confirmed by the spatial distributions of areas with linear trends. After comparing the estimated GWS change with the in situ groundwater level change from thirteen monitoring wells, we concluded that the groundwater levels in Shanghai and Zhejiang Provinces slightly recovered over the last 20 years and that this trend will continue in the coming years, mainly due to the sustainable water resource management policies of the local governments.
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最近 20 年长江三角洲地区陆地蓄水量的变化
摘要。监测区域陆地水储量(TWS)和地下水储量(GWS)的变化对于有效管理水资源非常重要。在此,我们利用 GRACE/GRACE-FO mascon 解决方案、GLDAS NOAH 模型以及监测井在 2002 年 4 月至 2022 年 12 月期间的原位地下水位变化,研究了长江三角洲的陆地储水量(TWS)和地下水储量(GWS)变化。结果表明,整个长江三角洲的区域平均 TWS 变化率为 0.62±0.10 毫米/年,GWS 部分为 0.47±0.07 毫米/年,其他部分为 0.15±0.08 毫米/年,包括 GLDAS NOAH 模型得出的土壤水分、雪水和地表水变化。在流域尺度上,上海和浙江省的蓄水量呈明显的正变化趋势,而江苏和安徽省的蓄水量则呈相对较小的负变化趋势,这一点从线性变化趋势区域的空间分布上得到了证实。将估算的地下水水位变化与 13 口监测井的原位地下水水位变化进行比较后,我们得出结论,上海市和浙江省的地下水水位在过去 20 年中略有回升,且这一趋势在未来几年仍将持续,这主要归功于当地政府的可持续水资源管理政策。
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来源期刊
Solid Earth
Solid Earth GEOCHEMISTRY & GEOPHYSICS-
CiteScore
6.90
自引率
8.80%
发文量
78
审稿时长
4.5 months
期刊介绍: Solid Earth (SE) is a not-for-profit journal that publishes multidisciplinary research on the composition, structure, dynamics of the Earth from the surface to the deep interior at all spatial and temporal scales. The journal invites contributions encompassing observational, experimental, and theoretical investigations in the form of short communications, research articles, method articles, review articles, and discussion and commentaries on all aspects of the solid Earth (for details see manuscript types). Being interdisciplinary in scope, SE covers the following disciplines: geochemistry, mineralogy, petrology, volcanology; geodesy and gravity; geodynamics: numerical and analogue modeling of geoprocesses; geoelectrics and electromagnetics; geomagnetism; geomorphology, morphotectonics, and paleoseismology; rock physics; seismics and seismology; critical zone science (Earth''s permeable near-surface layer); stratigraphy, sedimentology, and palaeontology; rock deformation, structural geology, and tectonics.
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