scholarly journals Phytoplankton diversity and water quality in the main stream and tributaries of Three Gorges Reservoir region of Yangtze River during dry seasons

2013 ◽  
Vol 25 (3) ◽  
pp. 378-385 ◽  
Author(s):  
ZHU Aimin ◽  
◽  
HU Juxiang ◽  
LI Sixin ◽  
ZHOU Lianfeng ◽  
...  
Keyword(s):  
Water Quality ◽  
Yangtze River ◽  
Three Gorges Reservoir ◽  
Main Stream ◽  
Three Gorges ◽  
Phytoplankton Diversity ◽  
Three Gorges Reservoir Region ◽  
Dry Seasons

scholarly journals Assessment of the Suitability of Wintering Anatidae Habitats before and after Impoundment in the Three Gorges Reservoir Region

2021 ◽  
Vol 13 (9) ◽  
pp. 4743
Author(s):  
Xiuming Li ◽  
Ruimei Cheng ◽  
Wenfa Xiao ◽  
Ge Sun ◽  
Tian Ma ◽  
...  
Keyword(s):  
Yangtze River ◽  
Three Gorges Reservoir ◽  
Main Stream ◽  
Three Gorges ◽  
The Yangtze River ◽  
The Three Gorges Reservoir ◽  
The Three Gorges ◽  
Three Gorges Reservoir Region ◽  
Surrounding Areas ◽  
The Impact

In this study, we aimed to understand the distribution of and changes in the habitats suitable for Anatidae wintering in the Three Gorges Reservoir Region (TGRR), China, and to explore the impact of the impoundment during different impoundment periods. Based on species occurrence data for four dominant species of Anatidae and environmental factors, a maximum entropy (MaxEnt) model was used to analyze the suitability of habitats during five impoundment periods. The results show that the main factors affecting Anatidae distribution were temperature and roads before the Three Gorges Project (TGP) and elevation after the TGP. After the TGP, the area of the suitable habitat declined rapidly and then gradually increased with increasing water level. After impoundment, the primary area of increased habitat suitability was the main stream of the Yangtze River from Changshou District to Yunyang County and its tributary in the Kaizhou area. Among the habitats, the central water regions were more suitable than the marginal shoal areas. Anatidae habitats in the TGRR were distributed mainly within the Yangtze River main stream and the surrounding areas before the TGP, and the surrounding areas largely disappeared after the TGP, particularly in Chongqing City and Jiangjin District. In this context, it is challenging to create new protected areas within the habitat suitable for Anatidae in the main stream of the Yangtze River; we propose adding the Anatidae as conservation targets within the existing conservation agencies and implementing a waterbird monitoring program for scientific waterbird conservation and the sustainable development of the reservoir.

The Influence of Hydrodynamic Conditions on Algal Bloom in the Three Gorges Reservoir Tributaries

2013 ◽  
Vol 295-298 ◽  
pp. 1981-1990 ◽  
Author(s):  
Chao Jun Xiong ◽  
De Fu Liu ◽  
Bing Hui Zheng ◽  
Jia Lei Zhang ◽  
Nian San Hu ◽  
...  
Keyword(s):  
Flow Velocity ◽  
Yangtze River ◽  
Three Gorges Reservoir ◽  
Algal Bloom ◽  
General Situation ◽  
Main Stream ◽  
Three Gorges ◽  
Hydrodynamic Conditions ◽  
The Three Gorges Reservoir ◽  
The Three Gorges

Water level has risen considerably since the impounding of Three-Gorges Reservoir in year 2003 and that might broaden and deepen the Yangtze River and the tributary of Three Gorge, will greatly slowdown the flow velocity to change hydrodynamic conditions. This changes Influence the Water Environment of Yangtze River and the tributary of Three Gorges Reservoir, especially eutrophication and algal bloom of the tributaries in Three Gorges Reservoir in recent years. For studying the course of algal bloom in the tributaries of Three Gorges Reservoir and the comprehensive prevention countermeasures, about the hydrodynamics of Yangtze River main stream and tributary in Three Gorges Reservoir must be carefully researched. In this article, general situation of the algal bloom of the tributaries in Three Gorges Reservoir were presented, and analysed on characteristics and influencing factors of breakout of algal bloom from certain self-conditions changes before and after impoundment of the Three Gorges reservoir, knowing that lower the nutrient input and improve water flow regime and flow velocity behaviors are the main measures of comprehensive prevention countermeasures of algal bloom in the tributaries of Three Gorges Reservoir; This research status of influence mechanism of hydrodynamic conditions on algal bloom and the research tendency of the tributaries’ hydrodynamic conditions on algal bloom in Three Gorges Reservoir were reviewed, which provided certain theory reference for study and prevention countermeasures of algal bloom in the Three Gorges Reservoir tributaries.

scholarly journals Geochemistry of Dissolved Heavy Metals in Upper Reaches of the Three Gorges Reservoir of Yangtze River Watershed during the Flood Season

Water ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 2078
Author(s):  
Jie Zeng ◽  
Guilin Han ◽  
Mingming Hu ◽  
Yuchun Wang ◽  
Jinke Liu ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Water Quality ◽  
Yangtze River ◽  
Three Gorges Reservoir ◽  
Hazard Index ◽  
Principal Component ◽  
Main Channel ◽  
Anthropogenic Sources ◽  
Three Gorges ◽  
Dissolved Heavy Metals

Dissolved heavy metals (HMs), derived from natural and anthropogenic sources, are an important part of aquatic environment research and gain more international concern due to their acute toxicity. In this study, the geochemistry of dissolved HMs was analyzed in the upper Three Gorges Reservoir (TGR) of the Yangtze River (YZR) watershed to explore their distribution, status, and sources and further evaluate the water quality and HM-related risks. In total, 57 water samples were collected from the main channel and tributaries of the upper TGR. The concentrations of eight HMs, namely V, Ni, Cu, Zn, As, Mo, Cd, and Pb, were measured by ICP-MS. The mean concentrations (in μg/L) of eight HMs decreased in the order: As (1.46), V (1.44), Ni (1.40), Mo (0.94), Cu (0.86), Zn (0.63), Pb (0.03), and Cd (0.01). The concentrations of most HMs were 1.4~8.1 times higher than that in the source area of the YZR, indicating a potential anthropogenic intervention in the upper TGR. Spatially, the concentrations of V, Cu, As, and Pb along the main channel gradually decreased, while the others were relatively stable (except for Cd). The different degrees of variations in HM concentrations were also found in tributaries. According to the correlation analysis and principal component (PC) analysis, three PCs were identified and explained 75.1% of the total variances. combined with the concentrations of each metal, PC1 with high loadings of V, Ni, As, and Mo was considered as the main contribution of human inputs, PC2 (Cu and Pb) was primarily attributed to the contribution of mixed sources of human emissions and natural processes, and Zn and Cd in PC3 were controlled by natural sources. Water quality assessment suggested the good water quality (meeting the requirements for drinking purposes) with WQI values of 14.1 ± 3.4 and 11.6 ± 3.6 in the main channel and tributaries, respectively. Exposure risk assessment denoted that the health effects of selected HMs on the human body were limited (hazard index, HI < 1), but the potential risks of V and As with HI > 0.1 were non-negligible, especially for children. These findings provide scientific support for the environmental management of the upper TGR region and the metal cycle in aquatic systems.

Non-Uniform Sediment Input of the Middle Yangtze River, China

2014 ◽  
Vol 641-642 ◽  
pp. 70-74
Author(s):  
Hua Ge ◽  
Ling Ling Zhu ◽  
Ren Yong Huang
Keyword(s):  
Human Activities ◽  
Yangtze River ◽  
Three Gorges Reservoir ◽  
Normal Operation ◽  
Main Stream ◽  
Three Gorges ◽  
Upper Yangtze River ◽  
Sediment Input ◽  
Lower Yangtze ◽  
The Upper Yangtze River

The non-uniform sediment input has played a significant role in the bed evolution in the middle and lower Yangtze River, which indirectly influences the amount of the sediment transported into the East China Sea every year. However, it has been dramatically changed by the climate change, especially the human activities in the upper Yangtze River, not only the amount, but also the grading. The average annual sediment load has reached to 402.6 million tons since 1960s, while showing a decreasing and refining trend mostly influenced by the human activities, such as soil and water conservation, and large hydropower projects. The most direct consequence of these changes was to cause severe erosion in the middle and lower Yangtze River, further to bring about fluvial regime adjustment. In this article, a series of daily and annual averaged sediment transport data since 1960’ were collected and analyzed to find the impacts of the significant human activities on the non-sediment input of the middle Yangtze River, and then its variation tendency was predicted, affected by the existed large hydropower projects and to be build ones in the upper Yangtze river. The result shows that the non-uniform sediment input of the middle Yangtze River was slightly reduced by the operation of Gezhouba Project and the up and middle Yangtze River water and soil conservation prevention and control projects, and further less after the impoundment of Three Gorges Reservoir, meanwhile its grading has been getting finer and finer. In future, along with the normal operation of the Three Gorges Reservoir and the built of the cascade reservoirs in the upper main stream and tributaries of the Yangtze River, it will be continuously reduced and refined.

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