Simulation of the Dynamic Water Storage and Its Gravitational Effect in the Head Region of Three Gorges Reservoir Using Imageries of Gaofen-1
Simulation of the Dynamic Water Storage and Its Gravitational Effect in the Head Region of Three Gorges Reservoir Using Imageries of Gaofen-1
复制标题
利用高分一号影像模拟三峡水库头区动态蓄水及其重力效应
DOI：
10.3390/rs12203353
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发表时间：
2020-10
期刊：
影响因子：
5
通讯作者：
Jinsong Du
中科院分区：
文献类型：
--
作者：
Xian Ma;Linsong Wang;Chao Chen;Jinsong Du
以三峡水库巨大蓄水质量荷载为驱动，构建高分辨率动态蓄水模型，是准确模拟重力、地壳形变、应力等地球物理场变化的必要基础数据。然而，以往建立的模型由于简化和近似，没有考虑水位变化引起的河流边界变化，无法满足准确模拟三峡库区蓄水效应的需要。本研究结合高分辨率高分一号（GF-1）卫星图像和坝前实时水位，基于归一化差分水指数（NDWI）和Otsu方法的阈值分割，提取了三峡库头区最低（145 m）和最高（175 m）蓄水阶段之间的31条河流边界。基于更高分辨率的GF-1数据开发的动态蓄水模型可以更准确地显示真实的河流边界变化，特别是在局部区域。与之前的近似模型相比，我们构建的模型准确地刻画了不同蓄水阶段的边界分布信息。此外，我们基于动态蓄水模型的高精度正演模型（即考虑动态水域和水位的变化）模拟了TGR引起的重力效应。理论模拟结果与现场重力测量结果一致，差异主要在10 μGal以内。研究结果表明，三峡库区蓄水变化主要影响库岸1000 m范围内的重力场响应，其最大幅度可达数百μGal。动态蓄水及其重力效应模拟结果可以有效消除人为控制下的TGR驱动的地表水负荷的影响，大大提高区域重力观测数据的信噪比。因此，这项工作将有利于地球物理和大地测量的应用，旨在全面跟踪当地和区域的地质结构稳定性，例如人工水库诱发的地震和滑坡。
The construction of a high-resolution dynamic water storage model, driven by the mass load of the huge water storage of the Three Gorges Reservoir (TGR), is the necessary basic data for accurately simulating changes in the geophysical field, e.g., gravity, crustal deformation, and stress. However, previously established models cannot meet the needs of accurately simulating the impoundment effects of TGR, because these models were simplified and approximated and did not consider the variation of river boundaries caused by water level changes. In this study, we combined high-resolution Gaofen-1 (GF-1) satellite imageries and real-time water level in front of the dam and extracted 31 river boundaries of the head region of TGR between the lowest (145 m) and the highest (175 m) impoundment stages based on the Normalized Differential Water Index (NDWI) and threshold segmentation from Otsu method. Developed dynamic water storage model based on higher-resolution GF-1 data can show the true river boundary changes more exactly, especially in local areas. Compared to the previous approximate models, the model that we constructed accurately depicts the boundary distribution information of the different impoundment stages. Moreover, we simulated TGR-induced gravitational effects based on the high-precision forward modeling of the dynamic water storage model (i.e., considering changes of dynamic water area and water level). The theoretical modelled results are consistent with in situ gravity measurements with the difference mainly within 10 μGal. Our results indicate that water storage variations of TGR mainly affect the gravity field response within 1000 m of the reservoir bank with its maximum amplitude up to several hundred μGal. The dynamic water storage and its simulation results of gravitational effects can effectively eliminate the impact of surface water load driven by the TGR under human control and greatly improve the signal-to-noise ratio of regional gravity observational data. Thus, this work will be beneficial in the application of geophysical and geodetic monitoring aimed to comprehensively track the local and regional geological structural stability, e.g., artificial reservoir induced earthquake and landslide.
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影响因子：
2.8
作者：
Lei Zhang;Duoxing Yang;Yaowei Liu;Yong-tai Che;D. Qin
通讯作者：
Lei Zhang;Duoxing Yang;Yaowei Liu;Yong-tai Che;D. Qin
1960-2015年中国湖泊演化的区域差异及其自然和人为原因
影响因子：
13.5
作者：
Zhang Guoqing;Yao T;ong;Chen Wenfeng;Zheng Guoxiong;Shum C K;Yang Kun;Piao Shilong;Sheng Yongwei;Yi Shuang;Li Junli;O'Reilly Catherine M;Qi Shuhua;Shen Samuel S P;Zhang Hongbo;Jia Yuanyuan
通讯作者：
Jia Yuanyuan
DOI：
10.11947/j.agcs.2016.20160016
发表时间：
2016-10
期刊：
--
影响因子：
--
作者：
Wang Linsong;C. Chao;Ma Xian;Du Jinsong
通讯作者：
Wang Linsong;C. Chao;Ma Xian;Du Jinsong
影响因子：
9.8
作者：
W. Wan;D. Long;Y. Hong;Yingzhao Ma;Yuan Yuan-Yuan;P. Xiao;H. Duan;Z. Han;Xingfa Gu
通讯作者：
W. Wan;D. Long;Y. Hong;Yingzhao Ma;Yuan Yuan-Yuan;P. Xiao;H. Duan;Z. Han;Xingfa Gu
影响因子：
2
作者：
Linsong Wang;Chao Chen;Rong Zou;Jinsong Du
通讯作者：
Linsong Wang;Chao Chen;Rong Zou;Jinsong Du