Effects of an increase in reservoir drawdown rate on bank slope stability: A case study at the Three Gorges Reservoir, China

Sun, Guanhua; Yang, Yongtao; Jiang, Wei; Zheng, Hong

doi:10.1016/j.enggeo.2017.02.018

Cited by 76 publications

(25 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For instance, the average daily sediment concentration at Yichang reduced from 0.406 kg/m 3 over 1981-2002 to 0.032 kg/m 3 , 0.010 kg/m 3 , 0.004 kg/m 3 during the first stage, second stage, and third stage, respectively, of the post-TGR period. The low sediment in the clear water with high energy can trigger serious riverbed scouring and riverbank collapse in the downstream channels [8,44,45]. In addition, low sediment may also harm the spawning of Chinese sturgeons as they are rather sensitive to the sediment condition during their propagation.…”

Section: Discussionmentioning

confidence: 99%

Potential Impact of a Large-Scale Cascade Reservoir on the Spawning Conditions of Critical Species in the Yangtze River, China

Yang

Liu

et al. 2019

Water

View full text Add to dashboard Cite

Dam building and reservoir operations alter the downstream hydrological regime, and as a result, affect the health of the river aquatic ecosystem, particularly for large-scale cascade reservoirs. This study investigated the impact of the Gezhouba Reservoir (GR) and the Three Gorges Reservoir (TGR) on the spawning conditions of two critical taxa, i.e., the endemic four major carps and the endangered Chinese sturgeon in the Yangtze River. We analyzed the flow, sediment, and thermal regime in these two taxa spawning seasons and compared their features between the predam and postdam periods. Our results revealed that the GR and the TGR had altered the frequency distributions of flow, sediment, and water temperature to different degrees, with the impact by the GR on the carps and Chinese sturgeon ranked as water temperature > flow, sediment > water temperature > flow, and the effect of the TGR on these two taxa were ordered as flow > water temperature, sediment > flow > water temperature. For the GR, the satisfying degree of the suitable flow and water temperature of the carps increased, whilst the suitable flow, sediment, and water temperature for the Chinese sturgeon decreased. These changes in TGR showed a significant ascending (descending) trend in the suitable flow (water temperature) for the carps, and a clear decreasing trend in the flow, sediment, and temperature for Chinese sturgeon. Both the TGR and the GR had negative impacts on the spawning of these two taxa in terms of the rising/falling flow characteristics.

show abstract

Section: Discussionmentioning

confidence: 99%

Potential Impact of a Large-Scale Cascade Reservoir on the Spawning Conditions of Critical Species in the Yangtze River, China

Yang

Liu

et al. 2019

Water

View full text Add to dashboard Cite

show abstract

“…The drawdown of reservoir water is a critical condition for destabilizing landslides [3]. Observations that landslide deformation is associated with the reservoir drawdown have been widely reported [4][5][6][7][8]. The dynamic seepage pressure pointing outwards the slope is a crucial factor for deforming landslides after water level drawdown [9][10][11], especially when the landslide material has a low hydraulic conductivity [12].…”

Section: Introductionmentioning

confidence: 99%

Model Test and Numerical Analysis on the Deformation and Stability of a Landslide Subjected to Reservoir Filling

Zhou

et al. 2019

Geofluids

View full text Add to dashboard Cite

Reservoir filling can affect the landslide stability and cause the landslide deformation within the reservoir area. In this paper, a physical model test and a series of numerical analyses were combined to investigate the landslide deformation and stability under reservoir filling. The surface deformation, deep displacement, and pore water pressure were recorded during the physical model test. In the model test, the increasing period of the pore water pressure inside the landslide is proposed to be a critical period for the landslide subjected to the reservoir filling. During this period, large landslide deformation occurred. The numerical analyses show that a greater factor of safety (FOS) appeared under a higher water level rising rate or a lower permeability coefficient during the water level rising stage when other variables are fixed, due to the domination of the reservoir buttressing effect which can increase the landslide resistance. During the reservoir maintaining stage, the reservoir water infiltrated into the landslide continuously to cause the matric suction dissipation and pore water pressure increase, which reduced the landslide shear strength and then decreased the landslide stability.

show abstract

“…A large number of massive hydropower stations have been constructed in south-western China, including the Jinping-I and Jinping-II Hydropower Stations on the Yalong River, the Dagangshan Hydropower Station on the Dadu River, the Maoergai Hydropower Station on the Heishui River and the Three Gorges Hydropower Station on the Yangtze River (Zhou et al 2010;Jiao et al 2014;Gui et al 2016;Yin et al 2016). After the construction of a high dam, the water storage and constantly fluctuating water have an adverse influences on slope alone the river banks and lead to changes in the local climate and ecological environment (Wang et al 2004;Mazaeva et al 2013;Zhou et al 2016b) to accelerate the adverse influences on safety of slope (Hu et al 2015;Babanouri and Dehghani 2017;Sun et al 2017). These reservoir landslides pose a great threat to the safety of hydropower stations (especially high dams), coastal infrastructure and human life.…”

Section: Introductionmentioning

confidence: 99%

Spatiotemporal distribution and failure mechanism analyses of reservoir landslides in the Dagangshan reservoir, south-west China

Zhang

Yang

et al. 2018

Geomatics, Natural Hazards and Risk

View full text Add to dashboard Cite

Reservoir impoundment and water fluctuations have endangered the stability of the reservoir bank slopes, which have experienced several small-scale shallow slides/collapses and few large-scale slopes with failures/deformations. Field investigations, unmanned aerial vehicle technology and site displacement monitoring dates are used to study the spatiotemporal distribution and mechanisms of the reservoir landslides within the Dagangshan reservoir. The reservoir landslides can be divided into two main types: shallow small-scale slides and unstable deformation slopes, which are clearly associated with reservoir impoundment and fluctuations of the water level. Small-scale slides/collapses are continually distributed along the river banks nearest to the water level, but deepseated landslides have usually experienced a long history, and some obvious precursor phenomena may exist in the slopes. According to the recognition of deformational and failure evolutionary processes of large-scale slopes, and based on hydrology and geomechanics, two types of potential failure models (creep-shear-tension failure and toppling-tensile-shear model) are proposed to interpret the mechanisms of the deformation slopes in the Dagangshan reservoir. Furthermore, some preliminary discussion is presented concerning the non-significant development of landslides in the Dagangshan reservoir that are also associated with smaller water fluctuations due to the daily regulation type of the reservoir.

show abstract

Effects of an increase in reservoir drawdown rate on bank slope stability: A case study at the Three Gorges Reservoir, China

Cited by 76 publications

References 36 publications

Potential Impact of a Large-Scale Cascade Reservoir on the Spawning Conditions of Critical Species in the Yangtze River, China

Potential Impact of a Large-Scale Cascade Reservoir on the Spawning Conditions of Critical Species in the Yangtze River, China

Model Test and Numerical Analysis on the Deformation and Stability of a Landslide Subjected to Reservoir Filling

Spatiotemporal distribution and failure mechanism analyses of reservoir landslides in the Dagangshan reservoir, south-west China

Contact Info

Product

Resources

About