Analysis of the Three Gorges Reservoir Operation on the Water Level of Yangtze River during the Non-Flood Season

2013 ◽  
Vol 864-867 ◽  
pp. 2207-2212 ◽  
Author(s):  
Jing Zheng
Keyword(s):  
Water Level ◽  
Yangtze River ◽  
Three Gorges Reservoir ◽  
Water Levels ◽  
Three Gorges ◽  
The Yangtze River ◽  
The Three Gorges Reservoir ◽  
Flood Season ◽  
The Three Gorges ◽  
Downstream Area

In the middle and downstream area of the Yangtze River, low water levels had occurred at post-flood season or before the flood season in recent years, since the trial impoundment of the Three Gorges Reservoir (TGR) in 2008. Based on the analysis of the low water levels, both rating curve of main stations in the middle and lower reaches of the Yangtze River and the operation of TGR in the dry season were analyzed in study to reveal the effects of the impoundment of TGR on water level of downstream areas. The research results show that the water supplement of the TGR could raise the downstream water level, which has positive effect on water supplement and navigation in this area.

The Response of the Spawning of the Four Major Chinese Carps to the Flow Re-Operation of the Three Gorges Reservoir in the Yangtze River, China

2014 ◽  
Vol 1065-1069 ◽  
pp. 3223-3234
Author(s):  
Qi Hong Yang ◽  
Qiang Wei ◽  
Ye Qiao ◽  
Lin Zhang ◽  
Jia Sheng Wang ◽  
...  
Keyword(s):  
Water Level ◽  
Yangtze River ◽  
Three Gorges Reservoir ◽  
Three Gorges ◽  
The Yangtze River ◽  
The Three Gorges Reservoir ◽  
The Three Gorges ◽  
Egg Density ◽  
Daily Discharge ◽  
Daily Water

The flow regime is a critical factor in the sustained ecological integrity of flowing water systems. The Yangtze River is the most important river in China. The Three Gorges Reservoir greatly changed the flow regime of the Yangtze River, resulting in effects on fish populations, particularly those of the four major Chinese carp (FMCC): black carp, grass carp, silver carp, and bighead carp. Spawning has dramatically decreased since the Three Gorges Reservoir was established in 2003.. Flow re-operation which raising duration time over 3 days and daily discharge change over 1000 m3/s/d were executed in 2012 for 2 times, This study investigated the impacts of flow regulation and re-operation on fish spawning, particularly for the FMCC, and validated the environmental factors that promote spawning of the FMCC. A significant difference in FMCC egg density was observed among five floods, and the FMCC mean egg density after the re-operation was nearly four times that of the regulation flood. A difference in community composition was observed between re-operation and regulation, indicating that the re-operation schedule was sufficient to change the egg community composition. The egg community was significantly correlated with water transparency, change in daily water discharge, and change in daily water level. The better regulation schedule we suggest was the mean daily discharge increase was approximately great than 2000 m3·s-1·d-1but less than 3050 m3·s-1·d-1, and daily water level increase greater than 0.46 m·d-1.

Regulation of Laijiapu Waterway in Jingjiang Reach

2014 ◽  
Vol 501-504 ◽  
pp. 2001-2006
Author(s):  
Ya Liu ◽  
Li Zheng ◽  
Cheng Tao Huang ◽  
Zhao Biao Huang ◽  
Lin Liu
Keyword(s):  
Yangtze River ◽  
Three Gorges Reservoir ◽  
Three Gorges ◽  
The Yangtze River ◽  
Point Bar ◽  
The Three Gorges Reservoir ◽  
The Three Gorges ◽  
Before And After ◽  
The Stability ◽  
Channel Bar

After impoundment of the Three Gorges Reservoir, Jingjiang reach, in the middle of the Yangtze River, has gradually shown a series of atypical fluvial features, adversely affecting the maintenance of waterways. Citing the Laijiapu Waterway, a meandering segment in the lower Jingjiang for example, this paper compared the fluvial features of the channel before and after the impoundment, summed up its navigation-obstructing features, and proposed guarding the point bar on the convex bank and channel bar in the widening section as a key to maintaining the stability of the navigation channels.

Research on Characteristics of New Water and Sediment of Yichang Station after Impoundment of the Three Gorges

2013 ◽  
Vol 779-780 ◽  
pp. 1613-1618 ◽  
Author(s):  
Yan Hua Yang ◽  
Xiao Qiang Liu ◽  
Hong Qian Zhang
Keyword(s):  
Yangtze River ◽  
Three Gorges Reservoir ◽  
Test Method ◽  
Rank Test ◽  
Sediment Runoff ◽  
Three Gorges ◽  
The Yangtze River ◽  
The Three Gorges Reservoir ◽  
The Three Gorges ◽  
Water And Sediment

Reservoir regulation and reservoir sedimentation make conditions of flow and sediment under the dam change greatly after impoundment of the Three Gorges Project. This paper analyzes change trend and abrupt change situation of incoming water and sediment and studies characteristics of new flow and sediment of Yichang Station after impoundment of the Three Gorges with Mann-Kendall nonparametric rank test method. The result indicates that operation of the Three Gorges Reservoir has leveled runoff process and shortened dry season and extended median water period. After operation of the Three Gorges Reservoir, annual sediment runoff and monthly sediment runoff of some months changed suddenly and sediment runoff reduced sharply in Yichang Station. Sediment entering the middle and the lower reaches of the Yangtze River decreases substantially and it almost can be regarded as clean water discharge. Intorduction After operation of 175m normal water level of the Three Gorges Reservoir, total storage capacity of the reservoir is about 43 billion m3. Most of incoming sediment in the upstream is intercepted and deposited inside the reservoir and clean water and muddy water containing non-bed sand discharges. Change of water and sediment conditions destroys balance of downstream river and causes bed-rebuilding of downstream channels. And this results in a serious of long-term and long distance changes, such as on-way recovery of sand content, undercutting of bed scour, expansion of bank erosion and decline of water table, etc.[1-. Yichang Station controls a drainage area of 1005501km2 in upstream of the Yangtze River and is a major flood source for the middle and the lower reach of the Yangtze River. Thus, water regime information of Yichang Station is significant to flood control of the middle and the lower reach of the Yangtze River, regulation of the Three Gorges Reservoir, construction of water conservancy project all across the Yangtze River, industrial and agricultural production and shipping, etc. On account of this, this article analyzes data about coming water and sediment of Yichang Station to support characteristics of new flow and sediment of Yichang Station after impoundment of the Three Gorges with Mann-Kendall nonparametric rank test method.

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