浏阳河长沙段COD<sub>Mn</sub>、NH<sub>3</sub>-N和TP综合降解系数研究

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Abstract Water mass tracking technique was applied to study the relationship between comprehensive degradation coefficients of COD_Mn, NH₃-N and TP and river velocity of Changsha Section of Liuyang River. Established correlation equations were verified using the measured hydrology and water quality data. The results demonstrated that, comprehensive degradation coefficients of COD_Mn, NH₃-N and TP presented obvious linear correlation with river velocity for Changsha Section of Liuyang River, with the correlation formation as K(COD_Mn)=0.037+0.635v, K(NH₃-N)=0.059+0.315v and K(TP)=0.004+0.140v, respectively. The established linear correlation equations between comprehensive degradation coefficients and river velocity generated accurate predictions of COD_Mn, NH₃-N and TP concentrations with all the determination coefficients greater than 0.90, and with all the relative root mean square errors less than 0.10. Because of the impacts of wind wave, and turbulent and circulating currents, the comprehensive degradation coefficients of COD_Mn, NH₃-N and TP for straight river section were greater than those for bending river section, correspondingly, when river velocity was less than 0.35m/s; while the comprehensive degradation coefficients of COD_Mn, NH₃-N and TP for bending river section were greater than those for straight river section, correspondingly, when river velocity was greater than 0.46m/s. This research is of importance for water quality management and environment protection for Changsha Section of Liuyang River.

Key words： water mass tracking technique water pollutants comprehensive degradation coefficient straight river section bending river section

Received: 15 July 2020

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	SHENG Feng
	FENG Tian-guo
	WANG Fu-ke
	WEN Ding
	HU Guo-hua

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SHENG Feng,FENG Tian-guo,WANG Fu-ke等. Comprehensive degradation coefficients of COD_Mn, NH₃-N and TP of Changsha section of Liuyang River[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(2): 669-676.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I2/669

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