The effect of large reservoirs impoundment to the spatial and temporal variations of regional crustal deformation in Hubei Province, China

The total capacity of Three Gorges Reservoir (TGR) and Danjiangkou Reservoir (DJR) is large and has significant seasonal fluctuations, which give rise to crustal instability. In this research, we focus on studying the temporal and spatial variation of crustal deformation in Hubei Province caused by...

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Main Authors: Wenbin Shen, Xueqing Zhang
Format: Article
Language:English
Published: KeAi Communications Co., Ltd. 2016-09-01
Series:Geodesy and Geodynamics
Subjects:
Online Access:http://www.sciencedirect.com/science/article/pii/S1674984716300659
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spelling doaj-cca197bf3ed940eab902b7063e84a0312021-03-02T10:59:53ZengKeAi Communications Co., Ltd.Geodesy and Geodynamics1674-98472016-09-017537738610.1016/j.geog.2016.06.002The effect of large reservoirs impoundment to the spatial and temporal variations of regional crustal deformation in Hubei Province, ChinaWenbin Shen0Xueqing Zhang1Department of Geophysics, School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, ChinaDepartment of Geophysics, School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, ChinaThe total capacity of Three Gorges Reservoir (TGR) and Danjiangkou Reservoir (DJR) is large and has significant seasonal fluctuations, which give rise to crustal instability. In this research, we focus on studying the temporal and spatial variation of crustal deformation in Hubei Province caused by reservoir impoundment of TGR and DJR. The Digital Elevation Model, historical hydrological information, GPS monitoring data and load-induced deformation model are combined to monitor the crustal deformation. The modeled results indicate that in the trapezoidal area between the TGR and DJR, the average vertical deformations at different latitudes have different variation tendencies. The vertical deformation modulus and fluctuation amplitude are larger at the latitude of 33°N/32.5°N from 2003 to 2006 and at the latitude of 31°N/32.5°N from 2008 to 2014, while the latter are much larger than the former. Moreover, from 2008 to 2014, the frequency and the intensity of seismic activities are all enhanced significantly in this region. The modeled results at the GPS sites are consistent with the vertical displacement of GPS monitoring results in trends and the waveform. It can be inferred that the seasonal deformation is elastic. The horizontal deformation components have the same variation trends with that at each GPS monitoring station, which demonstrates that the whole region is moving toward the southeast. The spatial variation of crustal deformation demonstrates that the impoundment of TGR in 2003 causes significant vertical displacements, with the maximum modulus of 32 mm downward located in Xiangjiang River's estuary. When the water storage increases, the maximum value will become larger, and the location will move toward the upstream. Besides, the earthquakes occurred more frequently in the region with maximum deformation modulus.http://www.sciencedirect.com/science/article/pii/S1674984716300659Three Gorges ReservoirDanjiangkou ReservoirImpoundmentCrustal deformationEarthquake
collection DOAJ
language English
format Article
sources DOAJ
author Wenbin Shen
Xueqing Zhang
spellingShingle Wenbin Shen
Xueqing Zhang
The effect of large reservoirs impoundment to the spatial and temporal variations of regional crustal deformation in Hubei Province, China
Geodesy and Geodynamics
Three Gorges Reservoir
Danjiangkou Reservoir
Impoundment
Crustal deformation
Earthquake
author_facet Wenbin Shen
Xueqing Zhang
author_sort Wenbin Shen
title The effect of large reservoirs impoundment to the spatial and temporal variations of regional crustal deformation in Hubei Province, China
title_short The effect of large reservoirs impoundment to the spatial and temporal variations of regional crustal deformation in Hubei Province, China
title_full The effect of large reservoirs impoundment to the spatial and temporal variations of regional crustal deformation in Hubei Province, China
title_fullStr The effect of large reservoirs impoundment to the spatial and temporal variations of regional crustal deformation in Hubei Province, China
title_full_unstemmed The effect of large reservoirs impoundment to the spatial and temporal variations of regional crustal deformation in Hubei Province, China
title_sort effect of large reservoirs impoundment to the spatial and temporal variations of regional crustal deformation in hubei province, china
publisher KeAi Communications Co., Ltd.
series Geodesy and Geodynamics
issn 1674-9847
publishDate 2016-09-01
description The total capacity of Three Gorges Reservoir (TGR) and Danjiangkou Reservoir (DJR) is large and has significant seasonal fluctuations, which give rise to crustal instability. In this research, we focus on studying the temporal and spatial variation of crustal deformation in Hubei Province caused by reservoir impoundment of TGR and DJR. The Digital Elevation Model, historical hydrological information, GPS monitoring data and load-induced deformation model are combined to monitor the crustal deformation. The modeled results indicate that in the trapezoidal area between the TGR and DJR, the average vertical deformations at different latitudes have different variation tendencies. The vertical deformation modulus and fluctuation amplitude are larger at the latitude of 33°N/32.5°N from 2003 to 2006 and at the latitude of 31°N/32.5°N from 2008 to 2014, while the latter are much larger than the former. Moreover, from 2008 to 2014, the frequency and the intensity of seismic activities are all enhanced significantly in this region. The modeled results at the GPS sites are consistent with the vertical displacement of GPS monitoring results in trends and the waveform. It can be inferred that the seasonal deformation is elastic. The horizontal deformation components have the same variation trends with that at each GPS monitoring station, which demonstrates that the whole region is moving toward the southeast. The spatial variation of crustal deformation demonstrates that the impoundment of TGR in 2003 causes significant vertical displacements, with the maximum modulus of 32 mm downward located in Xiangjiang River's estuary. When the water storage increases, the maximum value will become larger, and the location will move toward the upstream. Besides, the earthquakes occurred more frequently in the region with maximum deformation modulus.
topic Three Gorges Reservoir
Danjiangkou Reservoir
Impoundment
Crustal deformation
Earthquake
url http://www.sciencedirect.com/science/article/pii/S1674984716300659
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