IMPACT OF THE THREE GORGES WATER CONSERVANCY PROJECT ON RADIOACTIVITY CONCENTRATION LEVELS IN SURROUNDING WATERS

2020 ◽  
Vol 189 (4) ◽  
pp. 505-516
Author(s):  
Qiang Yang ◽  
Yang Shao ◽  
Hengyan Du ◽  
Xuefeng Lin ◽  
Lei Wang ◽  
...  
Keyword(s):  
Large Scale ◽  
Water Levels ◽  
Three Gorges ◽  
Radioactivity Concentration ◽  
The Three Gorges ◽  
Three Gorges Region ◽  
Water Conservancy ◽  
The Impact ◽  
Concentration Levels ◽  
Radioactivity Levels

Abstract Large-scale water conservancy projects bear much economic and social significance. However, there is a lack of systematic research on how such projects affect radioactivity levels in regional water bodies. For the first time, the present paper uses data for nearly 10 y at different impoundment levels during construction of the dam to analyze changes in water radioactivity concentration levels in China’s Three Gorges region, in order to provide a valuable reference for evaluating the impact of large-scale water conservancy projects on radioactivity concentration levels. Results show that gross α, gross β, U, Th, 226Ra, 40K, 90Sr and 137Cs levels in the water bodies of the Three Gorges region fall within normal limits and annual effective dose for the adults, children and infants are below the WHO recommended reference level of 0.1 mSv per y. The period where the sample was collected and spatial distribution are the main reasons why some radionuclides are not normally distributed. Different water levels during different periods result in large variations in the levels of certain radionuclides, indicating that water levels can have a strong influence on radionuclide levels in reservoir regions. Hence, when evaluating the impact of large-scale water conservancy projects on radioactivity levels, analysis should be carried out on samples collected during different periods in order to make accurate assessments.

In Situ Tests on Creep Behavior of Rock Mass with Joint or Shearing Zone in Foundation of Large-Scale Hydroelectric Projects

2004 ◽  
Vol 261-263 ◽  
pp. 1097-1102 ◽  
Author(s):  
Jian Liu ◽  
Xia Ting Feng ◽  
Xiu Li Ding ◽  
Huo Ming Zhou
Keyword(s):  
Rock Mass ◽  
Creep Behavior ◽  
Large Scale ◽  
Time Dependent ◽  
Three Gorges Project ◽  
Three Gorges ◽  
The Three Gorges ◽  
The Three Gorges Project

The time-dependent behavior of rock mass, which is generally governed by joints and shearing zones, is of great significance for engineering design and prediction of long-term deformation and stability. In situ creep test is a more effective method than laboratory test in characterizing the creep behavior of rock mass with joint or shearing zone due to the complexity of field conditions. A series of in situ creep tests on granite with joint at the shiplock area of the Three-Gorges Project and basalt with shearing zone at the right abutment of the Xiluodu Project were performed in this study. Based on the test results, the stress-displacement-time responses of the joints and basalt are analyzed, and their time-dependent constitutive model and model coefficients are given, which is crucial for the design to prevent the creep deformations of rock masses from causing the failure of the operation of the shiplock gate at the Three-Gorges Project and long-term stability of the Xiluodu arc dam.

Relationship between Waterway Depth and Low-Flow Water Levels in Reaches below the Three Gorges Dam

2019 ◽  
Vol 145 (1) ◽  
pp. 04018032 ◽  
Author(s):  
Yunping Yang ◽  
Mingjin Zhang ◽  
Wanli Liu ◽  
Jianjun Wang ◽  
Xiaoxing Li
Keyword(s):  
Water Levels ◽  
Three Gorges Dam ◽  
Low Flow ◽  
Three Gorges ◽  
The Three Gorges ◽  
The Three Gorges Dam

scholarly journals Characteristics of Atmospheric Metalliferous Particles during Large-Scale Fireworks in Korea

2015 ◽  
Vol 2015 ◽  
pp. 1-13 ◽  
Author(s):  
Zang-Ho Shon ◽  
Ju-Hee Jeong ◽  
Yoo-Keun Kim
Keyword(s):  
Trace Metals ◽  
Trace Metal ◽  
Large Scale ◽  
Background Level ◽  
Trace Metal Concentration ◽  
Urban Background ◽  
Ambient Concentration ◽  
Local Background ◽  
The Impact ◽  
Concentration Levels

The effect of large-scale firework events on urban background trace metal concentrations was investigated using 24 hr data collected over 3 days at three sites in Busan Metropolitan City, Republic of Korea, during the falls (Oct.) of 2011–2013. The firework events increased local background concentrations of trace metals as follows: K (1.72 times), Sr (2.64 times), As (2.86 times), Pb (2.91 times), and Al (5.44 times). The levels of some metals did not always drop to background level one day after the firework event. The contribution of fireworks to trace metal concentration levels (and emissions) for 2011 event was negligible compared to 2012 and 2013 events due to different meteorological conditions (precipitation). In addition, the impact of firework events on the ambient concentration levels of trace metals was likely to be different depending on their chemical speciation. The impact of firework events in Busan on urban air quality (trace metal) was less intense compared to other similar festivals worldwide. The largest emission of trace metals and elements from firework burning was represented by K (128–164 kg), followed by Pb, Cd, Cu, Mg, Ba, As, Al, Ga, Co, and Na.

scholarly journals The impact of the Three Gorges Dam on summer streamflow in the Yangtze River Basin

2019 ◽  
Vol 34 (3) ◽  
pp. 705-717
Author(s):  
Zhenkuan Su ◽  
Michelle Ho ◽  
Zhenchun Hao ◽  
Upmanu Lall ◽  
Xun Sun ◽  
...  
Keyword(s):  
River Basin ◽  
Yangtze River ◽  
Yangtze River Basin ◽  
Three Gorges Dam ◽  
Three Gorges ◽  
The Yangtze River ◽  
The Three Gorges ◽  
The Yangtze River Basin ◽  
The Impact ◽  
The Three Gorges Dam

scholarly journals Comparison of Large Woody Debris Prototypes in a Large Scale Non-flume Physical Model

2018 ◽  
Vol 40 ◽  
pp. 05010
Author(s):  
Brian Perry ◽  
Colin Rennie ◽  
Andrew Cornett ◽  
Paul Knox
Keyword(s):  
Physical Model ◽  
Flood Control ◽  
Large Scale ◽  
Woody Debris ◽  
Water Levels ◽  
Mitigation Strategies ◽  
Large Woody Debris ◽  
Debris Accumulation ◽  
The Impact ◽  
The City

Due to excessive rainfall in June of 2013, several rivers located in and near the City of Calgary, Canada experienced significant flooding events. These events caused severe damage to infrastructure throughout the city, precipitating a renewed interest in flood control and mitigation strategies for the area. A major potential strategy involves partial diversion of Elbow River flood water to the proposed Springbank Off-Stream Storage Reservoir. A large scale physical model study was conducted to optimize and validate the design of a portion of the new project. The goals of the physical model were to investigate diversion system behaviors such as flow rates, water levels, sediment transport and, debris accumulation, and optimize the design of new flow control structures to be constructed on the Elbow River. In order to accurately represent the behavior of debris within the system due to flooding, large woody debris created from natural sources was utilized in the physical model and its performance was compared to that of debris of the same size fabricated from pressed cylindrical wood dowels. In addition to comparing the performance of these two debris types, the impact of root wads on debris damming was also investigated. Significant differences in damming behavior was shown to exist between the natural debris and the fabricated debris, while the impact of root wad on damming affected the dam structure and formation. The results of this experiment indicate that natural debris is preferred for studies involving debris accumulation.

Analysis of the Construction of Qilihai South Pumping Station’s Ecological and Environmental Impact on Qilihai Wetland

2015 ◽  
Vol 744-746 ◽  
pp. 2362-2366 ◽  
Author(s):  
Sheng Guo Xu ◽  
Jin Feng Qu ◽  
Fang Qing Dong ◽  
Chun Li Chu ◽  
Gui Mei Jiang ◽  
...  
Keyword(s):  
Environmental Impact ◽  
Large Scale ◽  
Ecological Function ◽  
Ecological Environment ◽  
Water Conservancy Project ◽  
Water Conservancy ◽  
The Impact

The construction of water conservancy project will inevitably have some impact on the surrounding ecological environment, while construction of the water conservancy facilities is indispensable for the full play of wetland ecological function. It involving how to avoid damage to the local ecological environment in the process of large-scale water conservancy construction has become an important problem that construction of China's water conservancy project has to face.This paper analyses the construction of Qilihai south pumping station’s ecological and environmental impact on Qilihai wetland to give an example for the impact of water conservancy project.

scholarly journals Satellite InSAR as a New Tool for the Verification of Landslide Engineering Remedial Works at the Regional Scale: A Case Study in the Three Gorges Resevoir Area, China

2020 ◽  
Vol 10 (18) ◽  
pp. 6435
Author(s):  
Shuhao Liu ◽  
Samuele Segoni ◽  
Federico Raspini ◽  
Kunlong Yin ◽  
Chao Zhou ◽  
...  
Keyword(s):  
Slope Stability ◽  
Large Scale ◽  
Source Monitoring ◽  
Regional Scale ◽  
Critical Conditions ◽  
Three Gorges Reservoir Area ◽  
Three Gorges ◽  
Multi Scale ◽  
The Three Gorges ◽  
Slow Moving

Several countries worldwide are funding large-scale programs to mitigate landslide risk by implementing engineering remedial works. However, the overall effectiveness of such measures is rarely monitored, and they are typically performed at the slope scale without fully exploiting the wide-area capabilities of remote sensing technologies. A multi-scale and multi-source monitoring procedure for evaluating the slope stability and the effectiveness of related remedial works was proposed in this study and applied in the middle section of the Three Gorges Reservoir Area (TGRA), China. The area is highly exposed to landslide hazards, and a massive program of engineering remedial works was recently implemented. Satellite interferometric synthetic aperture radar (InSAR)-based techniques were first exploited at the regional scale with the objective to provide a general overview of the deformative scenario and to highlight localized problems (active landslides or high deformation zones) to be further investigated; then, local-scale field investigation and multi-source ground monitoring data were employed to verify the deforming states of active landslides and to evaluate the effectiveness of the landslide engineering remedial works. The results indicated that, among the 310 mapped landslides in the study area, 52 were identified to be active and in a slow-moving state by satellite InSAR; Among the 58 controlled landslides, 9 of them were suspected to be active in a slow-moving state and require further concern. Particular attention was paid to two controlled landslides that were found in a continuously and progressively deforming state. We observed that the regional-scale program of slope stabilization was highly successful; however, the variation of the surrounding environmental setting could have led to landslide reactivation or partial invalidation of the landslide remedial works. The proposed multi-scale and multi-source monitoring framework is low-cost, easy to perform, and very straightforward to communicate to citizens and authorities. It can be easily implemented with very wide areas to assess the slope stability and to investigate the effectiveness of large-scale governmental risk mitigation programs, identifying precursor signals that could allow for intervention before reaching critical conditions.

scholarly journals Time Series Analysis of Very Slow Landslides in the Three Gorges Region through Small Baseline SAR Offset Tracking

2017 ◽  
Vol 9 (12) ◽  
pp. 1314 ◽  
Author(s):  
Luyi Sun ◽  
Jan-Peter Muller ◽  
Jinsong Chen
Keyword(s):  
Time Series ◽  
Time Series Analysis ◽  
Three Gorges ◽  
Series Analysis ◽  
The Three Gorges ◽  
Three Gorges Region ◽  
Small Baseline ◽  
Offset Tracking
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