Influence of the south-to-north water transfer and the Yangtze River mitigation projects on the water quality of Han River, China

2021 ◽  
Vol 80 (7) ◽  
Author(s):  
Wen-wen Liu ◽  
Yi-Ming Kuo ◽  
Enmin Zhao
Keyword(s):  
Water Quality ◽  
Yangtze River ◽  
Water Transfer ◽  
The Yangtze River ◽  
The South ◽  
Han River ◽  
North Water ◽  
Mitigation Projects

Numerical Study on the Impact of the Sewage Drainage on Water Quality of Shanghai Water Sources

2012 ◽  
Vol 433-440 ◽  
pp. 1020-1026 ◽  
Author(s):  
Jie Gu ◽  
Wen Ting Li ◽  
Jing Huang ◽  
Bing Han
Keyword(s):  
Water Quality ◽  
Yangtze River ◽  
Numerical Study ◽  
Water Source ◽  
The Yangtze River ◽  
The South ◽  
Tidal Period ◽  
High Pollution ◽  
The Impact

A 2D current and water quality model was set up with Delft3D-FLOW in this research, which was well calibrated and verified with the observed tidal levels and velocities. Considered with the project of the Qingcaosha Water Source, Pollution concentration distribution caused by sewage outfalls in the south bank of the Yangtze River during a neap tide of dry season is simulated and the computed results show: a high pollution zone appears near the south shore, and moves upward with flood flow and downward with ebb flow, however, it is bounded a limit region around the outfalls. During the tidal period, the water quality of the Qingcaosha water source can be classified as the second class water, which can ensure the normal water supply as the Shanghai water source. It is suggested that the regular monitoring water quality in this high pollution zone should be put into practice to ensure the water quality of water sourecs. The Yangtze River is adjacent to the East Sea and it’s the largest river in China, with obvious seasonal variant runoff and tidal flow. The Yangtze River was bifurcated by Chongming Island to south and north branch from Xuliujing, most of the flow go down through the south branch. The south branch was divided into south and north channel by Changxing Island and Hengsha Island. The south channel was bifurcated by Jiuduansha Shoal to south and north passage, three bifurcation areas and four estuarine outlets were formed (see Fig 1.)

scholarly journals Water quality evaluation based on the water quality index method in Honghu Lake: one of the largest shallow lakes in the Yangtze River Economic Zone

2020 ◽  
Vol 20 (6) ◽  
pp. 2145-2155
Author(s):  
Libin Chen ◽  
Zhuo Tian ◽  
Kaipeng Zou
Keyword(s):  
Water Quality ◽  
Shallow Lakes ◽  
Water Quality Index ◽  
Yangtze River ◽  
Quality Index ◽  
The Yangtze River ◽  
Index Method ◽  
Honghu Lake ◽  
Economic Zone

Abstract Honghu Lake is the largest lake-type wetland in Hubei Province, China. It is also one of the largest shallow lakes in the Yangtze River Economic Zone, a key area in the relatively more developed southeast of China. However, the water quality has seen a deterioration tendency in recent decades, mostly owing to unreasonable human activities such as lake enclosure aquaculture following rapid social and economic development. Based on the water quality index (WQI) method, the water quality of Honghu Lake, by the vast amount of data collected from five observation sites monitored over ten years, was analyzed and evaluated. The results show that: (i) the water quality of Honghu Lake is in the ‘General’ grade as a whole with a WQI value of 43.41 ± 6.66; (ii) the water quality has been improving in the recent two years, reversing its decade-long deterioration; (iii) the water quality sampled at the Lantian site is the worst while that of the Guandun site is the best; (iv) the concentration of Pb and Cd are the key parameters to determine the water quality of Honghu Lake. Therefore, it can be concluded that more attention should be paid to investigate heavy metals in Honghu Lake in the future.

Prediction of water quality in South to North Water Transfer Project of China based on GA-optimized general regression neural network

2014 ◽  
Vol 15 (1) ◽  
pp. 150-157 ◽  
Author(s):  
Zhuomin Wang ◽  
Dongguo Shao ◽  
Haidong Yang ◽  
Shuang Yang
Keyword(s):  
Neural Network ◽  
Genetic Algorithm ◽  
Water Quality ◽  
Water Transfer ◽  
General Regression Neural Network ◽  
Quality Data ◽  
Water Delivery ◽  
The South ◽  
North Water ◽  
General Regression

The safety of water delivery and water quality in the South to North Water Transfer Project of China is important to northern China. Water quality data, flow data and data on factors that influence water quality were collected from 25 May to 26 August, 2013. These data were used to forecast water quality and calculate the relative error when using a genetic algorithm optimized general regression neural network (GA-GRNN) model as well as conventional general regression neural network (GRNN) and genetic algorithm optimized back propagation (GA-BP) models. The GA-GRNN method requires few network parameters and has good network stability, a high learning speed and strong approximation ability. The overall forecasted result of GA-GRNN is the best of three models, of which the root mean square error (RMSE) of every index is nearly the least among three models. The results reveal that the GA-GRNN model is efficient for water quality prediction under normal conditions and it can be used to ensure the security of water delivery and water quality in the South to North Water Transfer Project.

scholarly journals Impact of Yangtze River Water Transfer on the Water Quality of the Lixia River Watershed, China

PLoS ONE ◽  
2015 ◽  
Vol 10 (4) ◽  
pp. e0119720 ◽  
Author(s):  
Xiaoxue Ma ◽  
Lachun Wang ◽  
Hao Wu ◽  
Na Li ◽  
Lei Ma ◽  
...  
Keyword(s):  
Water Quality ◽  
River Water ◽  
Yangtze River ◽  
Water Transfer ◽  
River Watershed

scholarly journals Spatiotemporal Characteristics of the Water Quality and Its Multiscale Relationship with Land Use in the Yangtze River Basin

2021 ◽  
Vol 13 (16) ◽  
pp. 3309
Author(s):  
Jian Wu ◽  
Sidong Zeng ◽  
Linhan Yang ◽  
Yuanxin Ren ◽  
Jun Xia
Keyword(s):  
Water Quality ◽  
Land Use ◽  
Temporal Variation ◽  
Yangtze River ◽  
Stream Water ◽  
Yangtze River Basin ◽  
The Yangtze River ◽  
Stream Water Quality ◽  
The Yangtze River Basin

The spatiotemporal characteristics of river water quality are the key indicators for ecosystem health evaluation in basins. Land use patterns, as one of the main driving forces of water quality change, affect stream water quality differently with the variations in the spatiotemporal scales. Thus, quantitative analysis of the relationship between different land cover types and river water quality contributes to a better understanding of the effects of land cover on water quality, the landscape planning of water quality protection, and integrated water resources management. Based on water quality data of 2006–2018 at 18 typical water quality stations in the Yangtze River basin, this study analyzed the spatial and temporal variation characteristics of water quality by using the single-factor water quality identification index through statistical analysis. Furthermore, the Spearman correlation analysis method was adopted to quantify the spatial-scale and temporal-scale effects of various land uses, including agricultural land (AL), forest land (FL), grassland (GL), water area (WA), and construction land (CL), on the stream water quality of dissolved oxygen (DO), chemical oxygen demand (CODMn), and ammonia (NH3-N). The results showed that (1) in terms of temporal variation, the water quality of the river has improved significantly and the tributaries have improved more than the main rivers; (2) in the spatial variation respect, the water quality pollutants in the tributaries are significantly higher than those in the main stream, and the concentration of pollutants increases with the decrease of the distance from the estuary; and (3) the correlation between DO and land use is low, while that between NH3-N, CODMn, and land use is high. CL and AL have a negative effect on water quality, while FL and GL have a purifying effect on water quality. In particular, AL and CL have a significant positive correlation with pollutants in water. Compared with NH3-N, CODMn has a higher correlation with land use at a larger scale. The results highlight the spatial scale and seasonal dependence of land use on water quality, which can provide a scientific basis for land management and seasonal pollution control.

scholarly journals A study on the phytoplankton community structure in the Diaohe River section of the Middle Route of the South-to-North Water Diversion Project in winter

2020 ◽  
Author(s):  
Yi Xu ◽  
Jiankui Liang ◽  
Junqiang Lin ◽  
Xiaohui Lei ◽  
Gongbo Ding ◽  
...  
Keyword(s):  
Water Quality ◽  
Phytoplankton Community ◽  
Water Diversion ◽  
Future Research ◽  
River Section ◽  
The South ◽  
Water Diversion Project ◽  
North Water ◽  
Quality Indexes

Abstract As the first span and aqueduct of the Middle Route of the South-to-North Water Diversion Project, Diaohe Aqueduct has brought good engineering and social benefits since its completion. In order to understand the present water quality of the Diaohe River section of the route, four samplings were conducted at Diaohe Aqueduct in the winter of 2018. The main results of this study are as follows: 62 species (or variants) of phytoplankton belonging to 32 genera, 22 families and six phyla were identified during the study period, among which Bacillariophyta are the most dominant species. The identified phytoplankton fall into eight indicator grades: os; ps, αm; ps, αm, βm; αm; αm, βm; αm, βm, os; βm; and βm, os. A total of 17 functional groups are detected, among which TB is the absolute dominant functional group. Based on the composition characteristics of phytoplankton, the water quality trophic state of Diaohe Aqueduct is mesotrophic. However, other physical indexes show that the water quality of the Middle Route of the South-to-North Water Diversion Project is good. The conclusions drawn using phytoplankton alone as the evaluation index may not be comprehensive. In future research, how to build a comprehensive index system combining other water quality indexes for the Middle Route of the South-to-North Water Diversion Project needs yet to be improved and tested.

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