The dynamic capacity calculation method and the flood control ability of the Three Gorges Reservoir

Zhang, Shanghong; Jing, Zhu; Yang, Yi; Wu, Yu; Zhao, Yong

doi:10.1016/j.jhydrol.2017.10.043

Cited by 28 publications

(29 citation statements)

References 9 publications

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“…The simulation results show that the calculated water level is in good agreement with the measured data at the stations, and the water level error of the typical stations was between 0.02 and 0.33 m. This meets the calculation requirement for flood regulation of dynamic capacity (Zhang et al, ). The simulation results for some typical stations are shown in Figure .…”

Section: Resultssupporting

confidence: 68%

“…The water flowing in or out of the prisms cannot be simulated by the de Saint‐Venant equations (Ai, Chen, & An, ). At higher water levels, the water storage effect of the tributaries and river bends is more apparent, strongly affecting the accuracy of the simulated water level and reservoir capacity (Zhong et al, ).…”

Section: Methodsmentioning

confidence: 99%

“…First, the river between Zhutuo and the dam was divided into many segments according to cross sections, and the capacity curve of each segment was obtained based on the DEM data. The water surface line at time T + Δ t was calculated based on the water surface line at time T, and variable capacities V1 and V2 were calculated using the DEM data and the prism method according to the calculated water surface lines (Zhang, Jing, Yi, & Zhao, ). Then, ∆V = V1 − V2 was calculated (Figure ), and the channel capacity, Q t , of the tributaries was represented as a source or sink term:

Q_{t} = \frac{∆ V}{∆ t} .

…”

Section: Methodsmentioning

confidence: 99%

“…On the basis of the water surface line at time T, each time a new surface line Z is obtained, new ∆V and Q t also are obtained. The calculation continues until the water surface line is unchangeable, and then the calculation is repeated for the next time step (Zhang et al, ).…”

Section: Methodsmentioning

confidence: 99%

“…Regarding the flood control capacity of the TGR and the functional use of the flood diversion areas within the Jingjiang area, experts and scholars domestically and abroad have done much research (Cai, ; Li, Guo, Liu, & Chen, ; Li et al, ; Min, Wang, & Chen, ; Wang, Linage, Famiglietti, & Zender, ; Zheng, ). For the flood storage capacity of the TGR, Zhong, Li, and An () used a one‐dimensional, unsteady flow model to study the TGR dynamic capacity. It was found that in a 1,000‐year flood, flood storage can keep the flow at Zhicheng no more than 72,000 m 3 /s.…”

Section: Introductionmentioning

confidence: 99%

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Study of the flood control scheduling scheme for the Three Gorges Reservoir in a catastrophic flood

Zhang

Jing

et al. 2018

Hydrological Processes

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TheThree Gorges Project is the world's largest water conservancy project. According to the design standards for the 1,000-year flood, flood diversion areas in the Jingjiang reach of the Yangtze River must be utilized to ensure the safety of the Jingjiang area and the city of Wuhan. However, once these areas are used, the economic and life loss in these areas may be very great. Therefore, it is vital to reduce this loss by developing a scheme that reduces the use of the flood diversion areas through flood regulation by the Three Gorges Reservoir (TGR), under the premise of ensuring the safety of the Three Gorges Dam. For a 1,000-year flood on the basis of a highly destructive flood in 1954, this paper evaluates scheduling schemes in which flood diversion areas are or are not used. The schemes are simulated based on 2.5-m resolution reservoir topography and an optimized model of dynamic capacity flood regulation. The simulation results show the following. (a) In accord with the normal flood-control regulation discharge, the maximum water level above the dam should be not more than 175 m, which ensures the safety of the dam and reservoir area. However, it is necessary to utilize the flood diversion areas within the Jingjiang area, and flood discharge can reach 2.81 billion m 3 . (b) In the case of relying on the TGR to impound floodwaters independently rather than using the flood diversion areas, the maximum water level above the dam reaches 177.35 m, which is less than the flood check level of 180.4 m to ensure the safety of the Three Gorges Dam. The average increase of the TGR water level in theChongqing area is not more than 0.11 m, which indicates no significant effect on the upstream reservoir area. Comparing the various scheduling schemes, when the flood diversion areas are not used, it is believed that the TGR can execute safe flood control for a 1,000-year flood, thereby greatly reducing flood damage.

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Section: Resultssupporting

confidence: 68%

Section: Methodsmentioning

confidence: 99%