Response of eutrophication development to variations in nutrients and hydrological regime : a case study in the Changjiang River (Yangtze) Basin

Tang, X, Li, R, Han, D and Scholz, M ORCID: https://orcid.org/0000-0001-8919-3838 2020, 'Response of eutrophication development to variations in nutrients and hydrological regime : a case study in the Changjiang River (Yangtze) Basin' , Water, 12 (6) , e1634.

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Abstract

Data and literature related to water quality as well as nutrient loads were used to evaluate the Changjiang River (also Yangtze or Yangzi) Basin with respect to its hydrological regime, sediment transport, and eutrophication status. Waterbodies exhibited different eutrophic degrees following the ranking order of river reservoir lake. Most of the eutrophic lakes and reservoirs distributed in the upstream Sichuan Basin and Jianghan Plain are located in the middle main stream reaches. During the past decade, the water surface area proportion of moderately eutrophic lakes to total evaluated lakes continually increased from 31.3% in 2009 to 42.7% in 2018, and the trophic level of reservoirs rapidly developed from mesotrophic to slightly eutrophic. Construction and operation of numerous gates and dams changed the natural transportation rhythm of runoff, suspended solids (SS), and nutrients, and reduced flow velocity, resulting in decreased discharge runoff, slow water exchange, and decreased connectivity between rivers and lakes as well as accumulated nutrient and SS, which are the main driving forces of eutrophication. To mitigate eutrophication, jointly controlling and monitoring nutrient concentrations and flux at key sections, strengthening water quality management for irrigation backwater and aquaculture wastewater, and balancing transportation among runoff, SS, and nutrients is recommended.

Item Type: Article
Additional Information: ** From MDPI via Jisc Publications Router ** Licence for this article: https://creativecommons.org/licenses/by/4.0/ **Journal IDs: eissn 2073-4441 **History: published 07-06-2020; accepted 05-06-2020
Schools: Schools > School of Environment and Life Sciences
Journal or Publication Title: Water
Publisher: MDPI
ISSN: 2073-4441
Related URLs:
Funders: National Natural Science Foundation of China, Outstanding Young Talents of National High-level Personnel of the Special Support Program, China Three Gorges Corporation
SWORD Depositor: Publications Router
Depositing User: Publications Router
Date Deposited: 10 Jun 2020 12:56
Last Modified: 10 Jun 2020 14:37
URI: http://usir.salford.ac.uk/id/eprint/57255

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