Comprehensive degradation coefficients of CODMn, NH3-N and TP of Changsha section of Liuyang River
SHENG Feng1,2, FENG Tian-guo1,3, WANG Fu-ke1,3, WEN Ding1,3, HU Guo-hua1,2
1. School of Hydraulic Engineering, Changsha University of Science & Technology, Changsha 410114, China; 2. Key Laboratory of Water-Sediment Sciences and Water Disaster Prevention of Hunan Province, Changsha 410114, China; 3. Key Laboratory of Dongting Lake Aquatic Eco-Environmental Control and Restoration of Hunan Province, Changsha 410114, China
Abstract：Water mass tracking technique was applied to study the relationship between comprehensive degradation coefficients of CODMn, 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 CODMn, NH3-N and TP presented obvious linear correlation with river velocity for Changsha Section of Liuyang River, with the correlation formation as K(CODMn)=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 CODMn, 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 CODMn, 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 CODMn, 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.
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