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Int. J. Environ. Res. Public Health 2015, 12(4), 3564-3578; doi:10.3390/ijerph120403564

Fluctuation of the Water Environmental Carrying Capacity in a Huge River-Connected Lake

1,* , 2,†
,
2,†
,
2,†
and
3
1
Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake of Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China
2
College of Environment, Hohai University, Nanjing 210098, China
3
Hydrology Bureau of Jiangxi Province, Nanchang 330002, China
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Academic Editor: Miklas Scholz
Received: 25 February 2015 / Revised: 22 March 2015 / Accepted: 24 March 2015 / Published: 30 March 2015
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Abstract

A new method, with the non-fully mixed coefficient (NFMC) considered, was put forward to calculate the water environmental carrying capacity (WECC) for huge river-connected lakes, of which the hydrological conditions always vary widely during a year. Poyang Lake, the most typical river-connected lake and the largest freshwater lake in China, was selected as the research area. Based on field investigations and numerical simulation, the monthly pollutant degradation coefficients and non-fully mixed coefficients of different lake regions were determined to explore the WECCs of COD, TN and TP of Poyang Lake in a common water year. It was found that under the hydrological conditions of a common water year the total WECCs of COD, TN and TP in the lake were respectively 181.9 × 104 t, 33.3 × 104 t and 1.86 × 104 t. Due to the varied lake water volume and self-purification ability, an evident temporal fluctuation of WECCs in Poyang Lake was observed. The dry seasons were characterized by a higher NFMCs but lower WECCs owing to the lower water level and degradation ability. Variation coefficients of COD and TN WECC were close to each other, of which the average level was about 58.5%, a little higher than that of TP. View Full-Text
Keywords: Poyang Lake; river-connected lake; water environmental carrying capacity; numerical simulation; non-fully mixed coefficient; pollutant degradation coefficient Poyang Lake; river-connected lake; water environmental carrying capacity; numerical simulation; non-fully mixed coefficient; pollutant degradation coefficient
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Wang, H.; Zhou, Y.; Tang, Y.; Wu, M.; Deng, Y. Fluctuation of the Water Environmental Carrying Capacity in a Huge River-Connected Lake. Int. J. Environ. Res. Public Health 2015, 12, 3564-3578.

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