Investigating the effects of inflow river water quality on lake nutrient-concentration variations: a case study in Gehu Lake, China
Mingyuan Gao A , Chen Xu
B C D E * , Su Yang C D E and Bing Li C D E
+ Author Affiliations
- Author Affiliations
A Jiangsu Province Hydrology and Water Resources Investigation Bureau, Nanjing, 210029, PR China.
B School of Geography Science and Geomatics Engineering, Suzhou University of Science and Technology, Suzhou, Jiangsu, 215009, PR China.
C Key Laboratory of Watershed Geographic Sciences, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008, PR China.
D College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 100049, PR China.
E College of Nanjing, University of Chinese Academy of Sciences, Nanjing, 21135, PR China.
Marine and Freshwater Research - https://doi.org/10.1071/MF22165
Submitted: 14 August 2022 Accepted: 5 January 2023 Published online: 14 February 2023
© 2023 The Author(s) (or their employer(s)). Published by CSIRO Publishing
Abstract
Context: Controlling the inputs of nutrients, one of the main sources of lake pollution from inflow rivers, is an important way to protect lakes.
Aims: To obtain a whole picture of spatiotemporal variation of water quality in Gehu lake and its main inflow rivers from 2011 to 2018, and to study relationship of water quality between lake and inflow rivers.
Methods: We analysed the relationship by using correlation analysis and BATHTUB model and discussed the goal of collaborative control by setting up different scenarios.
Key results: The concentrations of total nitrogen (ρ(TN)) and total phosphorus (ρ(TP)) are the main water pollutants in Gehu Lake and it continues to maintain the middle-eutropher state. ρ(TN) and ρ(TP) in the lake have a significant negative correlation with the quantity of water inflow and a significant positive correlation with ρ(TN) and ρ(TP) in inflow rivers.
Conclusions: It showed that when ρ(TN) and ρ(TP) in inflow rivers decreased by 25%, ρ(TN) and ρ(TP) in Gehu Lake decreased by 21.01 and 22.64%. Furthermore, when ρ(TN) and ρ(TP) in inflow rivers decreased by 50%, they correspondingly decreased by 40 and 36.91% in the lake.
Implications: Our findings provide effective control of water quality in Gehu Lake and give a guide for environmental governance and water-quality improvement measures.
Keywords: BATHTUB model, eutrophication, inflow rivers, Lake Gehu, spatiotemporal, scenarios, total nitrogen, total phosphorus.
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