Does water diversion project deteriorate the water quality of reservoir and downstream? A case-study in Danjiangkou reservoir

Abstract It is of great significance to find a scientific way to assess the water quality of the middle route of the South-North Water Diversion Project. In this paper, the spatio-temporal changes of the 26 water quality indicators in eight key monitoring stations along the middle route since the project was put into use were analyzed, and the modified Nemerow index method was employed to assess the water quality of the route in its early stage of operation. The results show that the water quality remained good in the period of study. Important water quality indicators were identified, including temperature, permanganate index, dissolved oxygen, total phosphorus, total nitrogen, mercury content, and density of planktonic algae. It is advised that potential ecological risks related to algae and shellfish reproduction in the open canal deserve special attention.

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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

Water Science & Technology Water Supply ◽

10.2166/ws.2020.247 ◽

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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Influence of the South–North Water Diversion Project and the mitigation projects on the water quality of Han River

The Science of The Total Environment ◽

10.1016/j.scitotenv.2008.08.008 ◽

2008 ◽

Vol 406 (1-2) ◽

pp. 57-68 ◽

Cited By ~ 56

Author(s):

Y.P. Zhu ◽

H.P. Zhang ◽

L. Chen ◽

J.F. Zhao

Keyword(s):

Water Quality ◽

Water Diversion ◽

The South ◽

Han River ◽

Water Diversion Project ◽

North Water ◽

Mitigation Projects

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Effects of Ecological Spur Dikes on Spring Phytoplankton in Wangyu River

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.664.81 ◽

2013 ◽

Vol 664 ◽

pp. 81-86 ◽

Cited By ~ 1

Author(s):

Pei Fang Wang ◽

Jing Huang ◽

Chao Wang ◽

Xiao Yu Ai ◽

Jin Qian ◽

...

Keyword(s):

Water Quality ◽

Taihu Lake ◽

Diversity Indices ◽

Water Diversion ◽

Phytoplankton Diversity ◽

Water Diversion Project ◽

Improve Water Quality ◽

Spur Dikes ◽

Plankton Diversity

In order to study the effects of the newly-built ecological spur dikes on spring phytoplankton in Wangyu River, a riverway of water diversion project from Yangtze River to Taihu Lake, triple samplings were carried out in eleven sites from the near and upper water around the ecological spur dikes in April and May, 2011. The samples were collected to investigate the species and density of phytoplankton. Meanwhile, some environmental factors, such as temperature, pH, total nitrogen (TN), total phosphorus (TP) were determined. Indices of Simpson (D), Shannon-Wiener (H), Pielou (J) and Margalef (Dm) were used to analyze the change regulations of phytoplankton diversity. H, J, Dm were also used to evaluated the water quality, and they were 2.873, 0.532, 3.037. The results indicated that the composition of phytoplankton species was similar to the typical character of large or medium rivers. Based on the diversity indices, higher biological plankton diversity and better water quality emerged near the dikes. Results of this research supplied a theory for building ecological spur dikes to improve water quality of large or medium rivers and also provided a basis of using phytoplankton to monitor changes of water quality.

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