Impacts of artificial dams on terrestrial water storage changes and the Earth's elastic load response during 1950–2016: A case study of medium and large reservoirs in inland China

IF 2.8 4区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS

Geodesy and Geodynamics Pub Date : 2023-11-01 DOI:10.1016/j.geog.2023.07.009

Linsong Wang, Mingtao Zhu, Yulong Zhong, Jianwei Sun, Zhenran Peng

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Abstract

The construction of dams for intercepting and storing water has altered surface water distributions, land-sea water exchanges, and the load response of the solid Earth. The lack of accurate estimation of reservoir properties through the land surface and hydrological models can lead to water storage simulation and extraction errors. This impact is particularly evident in many artificial reservoirs in China. The study aims to comprehensively assess the spatiotemporal distribution and trends of water storage in medium and large reservoirs (MLRs) in inland China during 1950–2016, and to investigate the gravity, displacement, and strain effects induced by the reservoir mass concentration using the load elasticity theory. In addition, the impoundment contributions of MLRs to the relative sea level changes were assessed using a sea-level equation. The results show impoundment increases in the MLRs during 1950–2016, particularly in the Yangtze River (Changjiang) and southern basins, causing significant elastic load effects in the surrounding areas of the reservoirs and increasing the relative sea level in China's offshore. However, long-term groundwater estimation trends are overestimated and underestimated in the Yangtze River and southwestern basins, respectively, due to the neglect of the MLRs impacts or the uncertainty of the hydrological model's output (e.g., soil moisture, etc.). The construction of MLRs may reduce the water mass input from land to the ocean, thus slowing global sea level rise. The results of the impact of human activities on the regional water cycle provide important references and data support for improving the integration of hydrological models, evaluating Earth's viscoelastic responses under long-term reservoir storage, enhancing in-situ and satellite geodetic measurements, and identifying the main factors driving sea level changes.

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1950-2016年人工水坝对陆地蓄水变化及地球弹性荷载响应的影响——以中国内陆大中型水库为例

拦水和蓄水大坝的建设改变了地表水的分布、陆地-海水的交换和固体地球的荷载响应。由于无法通过地表和水文模型对水库性质进行准确估计，导致储水模拟和提取存在误差。这种影响在中国的许多人工水库中尤为明显。基于荷载弹性理论，综合评价了1950—2016年中国内陆大中型水库蓄水量的时空分布和变化趋势，并对水库质量浓度引起的重力、位移和应变效应进行了研究。此外，利用海平面方程评估了MLRs对相对海平面变化的蓄水贡献。结果表明:1950-2016年，长江流域和南部流域的水库蓄水量增加，导致水库周边地区的弹性荷载效应显著，中国近海相对海平面上升。然而，由于忽略了MLRs的影响或水文模型输出(如土壤湿度等)的不确定性，长江流域和西南流域地下水的长期估算趋势分别被高估和低估。MLRs的建设可能会减少从陆地到海洋的水团输入，从而减缓全球海平面上升。人类活动对区域水循环影响的研究结果为完善水文模型整合、评价库区长期蓄水条件下地球粘弹性响应、加强原位和卫星大地测量以及识别海平面变化的主要驱动因素提供了重要的参考和数据支持。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Geodesy and Geodynamics GEOCHEMISTRY & GEOPHYSICS-

CiteScore

4.40

自引率

4.20%

发文量

566

审稿时长

69 days

期刊介绍： Geodesy and Geodynamics launched in October, 2010, and is a bimonthly publication. It is sponsored jointly by Institute of Seismology, China Earthquake Administration, Science Press, and another six agencies. It is an international journal with a Chinese heart. Geodesy and Geodynamics is committed to the publication of quality scientific papers in English in the fields of geodesy and geodynamics from authors around the world. Its aim is to promote a combination between Geodesy and Geodynamics, deepen the application of Geodesy in the field of Geoscience and quicken worldwide fellows'' understanding on scientific research activity in China. It mainly publishes newest research achievements in the field of Geodesy, Geodynamics, Science of Disaster and so on. Aims and Scope: new theories and methods of geodesy; new results of monitoring and studying crustal movement and deformation by using geodetic theories and methods; new ways and achievements in earthquake-prediction investigation by using geodetic theories and methods; new results of crustal movement and deformation studies by using other geologic, hydrological, and geophysical theories and methods; new results of satellite gravity measurements; new development and results of space-to-ground observation technology.