Water Science and Engineering 2009, 2(4) 40-51 DOI:   10.3882/j.issn.1674-2370.2009.04.004  ISSN: 1674-2370 CN: 32-1785/TV

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water quality
chemical oxygen demand
dissolved oxygen
Yangtze Estuary
EFDC model
Yi-gang WANG
Su-xiang ZHANG
Article by Xi LI
Article by Yi-gang WANG
Article by Su-xiang ZHANG

Numerical simulation of water quality in Yangtze Estuary

Xi LI*1, 2, Yi-gang WANG1, 2, Su-xiang ZHANG3

1. College of Harbor, Coastal, and Offshore Engineering, Hohai University, Nanjing 210098, P. R. China
2. Key Laboratory of Coastal Disaster and Defence, Ministry of Education, Hohai University,
 Nanjing 210098, P. R. China
3. Key Laboratory of Meteorological Disaster of Ministry of Education, Nanjing University of Information Science and Technology, Nanjing 210044, P. R. China


In order to monitor water quality in the Yangtze Estuary, water samples were collected and field observation of current and velocity stratification was carried out using a shipboard acoustic Doppler current profiler (ADCP). Results of two representative variables, the temporal and spatial variation of new point source sewage discharge as manifested by chemical oxygen demand (COD) and the initial water quality distribution as manifested by dissolved oxygen (DO), were obtained by application of the Environmental Fluid Dynamics Code (EFDC) with solutions for hydrodynamics during tides. The numerical results were compared with field data, and the field data provided verification of numerical application: this numerical model is an effective tool for water quality simulation. For point source discharge, COD concentration was simulated with an initial value in the river of zero. The simulated increments and distribution of COD in the water show acceptable agreement with field data. The concentration of DO is much higher in the North Branch than in the South Branch due to consumption of oxygen in the South Branch resulting from discharge of sewage from Shanghai. The DO concentration is greater in the surface layer than in the bottom layer. The DO concentration is low in areas with a depth of less than 20 m, and high in areas between the 20-m and 30-m isobaths. It is concluded that the numerical model is valuable in simulation of water quality in the case of specific point source pollutant discharge. The EFDC model is also of satisfactory accuracy in water quality simulation of the Yangtze Estuary.

Keywords water quality   chemical oxygen demand   dissolved oxygen   Yangtze Estuary   EFDC model  
Received 2010-01-13 Revised 2010-01-12 Online: 2011-10-10 
DOI: 10.3882/j.issn.1674-2370.2009.04.004
Corresponding Authors: Xi LI
Email: xili@hhu.edu.cn
About author:

Banks, R. B., and Herrera, F. F. 1977. Effect of wind and rain on surface reaeration. Journal of the Environmental Engineering Division, 103(3), 489-504.
Chen, J. Y., and Chen, S. L. 2002. Impacts of the South-to-North Water Transfer Project on ecological environment at the Yangtze River Estuary. Water Resources Protection, 18(3), 9-13. (in Chinese)
Cline, J. D., and Richards, F. A. 1969. Oxygenation of hydrogen sulfide in seawater at constant salinity, temperature and pH. Environmental Science and Technology, 3(9), 838-843. [doi:10.1021/es60032a004]
Deng, Z. F., Sui, H. Y., and Wei, H. P. 2003. Zhuyuan outfall project and sewage marine disposal. Resources and Environment in the Yangtze Basin, 12(1), 39-44. (in Chinese)
Di Toro, D. M. 1980. Applicability of cellular equilibrium and Monod theory to phytoplankton growth kinetics. Ecological Modelling, 8, 201-218. [doi:10.1016/0304-3800(80)90038-1]
Gu, H. K. 1966. On the maximum value of dissolved oxygen in its vertical distribution in the sea. Oceanologia Et Limnologia Sinica, 8(2), 85-91. (in Chinese)
Hamrick, J. M. 1986. Long-term dispersion in unsteady skewed free surface flow. Estuarine, Coastal and Shelf Science, 23(6), 807-845. [doi:10.1016/0272-7714(86)90075-2]
Hamrick, J. M. 1992. A three-dimensional environmental fluid dynamics computer code: Theoretical and computational aspects, Virginia Institute of Marine Science, Special Report 317. Williamsburg: College of William and Mary.
Hamrick, J. M., and Wu, T. S. 1997. Computational design and optimization of the EFDC/HEM3D surface water hydrodynamic and eutrophication models. Delich, G., and Wheeler, M. F., eds., Next Generation Environmental Models and Computational Methods, 143-161. Philadelphia: Society for Industrial and Applied Mathematics.
Ji, Z. G., Morton, M. R., and Hamrick, J. M. 2001. Wetting and drying simulation of estuarine processes. Estuarine, Coastal and Shelf Science, 53(5), 683-700. [doi:10.1006/ecss.2001.0818]
Jin, K. R., Hamrick, J. H., and Tisdale, T. 2000. Application of three-dimensional hydrodynamic model for Lake Okeechobee. Journal of Hydraulic Engineering, 126(10), 758-771. [doi:10.1061/(ASCE)0733- 9429(2000)126:10(758)]
Jin, K. R., Ji, Z. G., and James, R. T. 2007. Three-dimensional water quality and SAV modeling of a large shallow lake. Journal of Great Lakes Research, 33(1), 28-45. [doi:10.3394/0380-1330(2007)33[28: TWQASM]2.0.CO;2]
Kuo, A. Y., Shen, J., and Hamrick, J. M. 1996. Effect of acceleration on bottom shear stress in tidal estuaries. Journal of Waterway, Port, Coastal, and Ocean Engineering, 122(2), 75-83. [doi:10.1061/(ASCE)0733- 950X(1996)122:2(75)]
Li, B. C., and Shi, H. Y. 2005. Analysis on the present situation of water environment in the Changjiang estuary. Water Resources Protection, 21(1), 39-44. (in Chinese)
Li, X., and Wang, Y. G. 2008. 3D hydro-environmental model of dissolved oxygen distribution in Yangtze estuary. Proceedings of 16th APD-IAHR Congress and 3rd Symposium of IARH-ISIS, Volume II: Environmental and Ecological Hydraulics, 680-683. Beijing: Tsinghua University Press.
Mellor, G. L., and Yamada, T. 1982. Development of a turbulence closure model for geophysical fluid problems. Review of Geophysics and Space Physics, 20(4), 851-875.
Mellor, G. L., and Blumberg, A. F. 1985. Modeling vertical and horizontal diffusivities with the sigma coordinate system. Monthly Weather Review, 113(8), 1379-1383. [doi:10.1175/1520-0493(1985)113< 1379:MVAHDW>2.0.CO;2]
Mellor, G. L. 1991. An equation of state for numerical models of oceans and estuaries. Journal of Atmospheric and Oceanic Technology, 8(4), 609-611. [doi:10.1175/1520-0426(1991)008<0609: AEOSFN>2.0.CO;2]
Meng, W., Qin, Y. W., Zheng, B. H., Fu, G., Li, Z. C., Lei, K., and Zhang, L. 2004. Analysis of nitrogen, phosphorus nutrients and COD in waters of Yangtze River Estuary. Environmental Science, 25(6), 65-68. (in Chinese)
Morel, F. and Hering, J. G. 1983. Principles and Applications of Aquatic Chemistry. New York: John Wiley and Sons.
O’Connor, D. J. and Dobbins, W. E. 1958. Mechanism of reaeration in natural streams. Transactions of the American Society of Civil Engineers, 123, 641-684.
Rosati, A. K. and Miyakoda, K. 1988. A general circulation model for upper ocean simulation. Journal of Physical Oceanography, 18(11), 1601-1626. [doi:10.1175/1520-0485(1988)018<1601:AGCMFU>2.0. CO;2]
Shen, J., Boon, J. D., and Kuo, A. Y. 1999. A modeling study of a tidal intrusion front and its impact on larval dispersion in the James River estuary, Virginia. Estuaries and Coasts, 22(3), 681-692. [doi:10.2307/ 1353055]
Shen, J., and Kuo, A. Y. 1999. Numerical investigation of an estuarine front and its associated eddy. Journal of Waterways, Ports, Coastal and Ocean Engineering, 125(3), 127-135. [doi:10.1061/(ASCE)0733-950X (1999)125:3(127)]
Shen, Z. L., Liu, Q., and Zhang, S. M. 2003. Distribution, variation and removal patterns of total nitrogen and organic nitrogen in the Changjiang River. Oceanologia et Limnologia Sinica, 34(6), 577-585. (in Chinese)
Shen, J. and Haas, L. 2004. Calculating age and residence time in the tidal York River using three-dimensional model experiments. Estuarine, Coastal and Shelf Science, 61(3), 449-461. [doi:10.1016/j.ecss.2004. 06.010]
Shen, J., and Lin, J. 2006. Modeling study of the influences of tide and stratification on age of water in the tidal James River. Estuarine, Coastal and Shelf Science, 68(1-2), 101-112. [doi:10.1016/j.ecss. 2006.01.014]
Shi, X. Y., Lu, R., Zhang, C. S., and Wang, X. L. 2006. Distribution and main influence factors process of dissolved oxygen in the adjacent area of the Changjiang Estuary in autumn. Periodical of Ocean University of China, 36(2), 287-290. (in Chinese)
Tu, J. B., and Wang, B. D. 2004. Biogeochemical studies on nutrient elements in the Changjiang Estuary. Marine Environmental Science, 23(4), 10-13. (in Chinese)
Wang, Y. G., and Li, X. 2007. Field observation of COD variation under tidal current in the Yangtze Estuary. Proceedings of the 4th International Conference on Asia and Pacific Coasts, 799-803. Beijing: China Ocean Press.
Wezernak, C. T., and Gannon, J. J. 1968. Evaluation of nitrification in streams. Journal of the Sanitary Engineering Division, 94 (SA5), 883-895.
Yan, Y. X., Zhang, S. X., and Li, X. 2007. 3D hydro environmental model of COD distribution in Nangang of Yangtze estuary. Journal of Waterway and Harbor, 28(4), 278-281. (in Chinese)
Yu, D. S. 2005. Study on Flow and Sediment Based on ADCP and its Application in 3-D Numerical Model in the Yangtze River Estuary. Ph. D. Dissertation. Nanjing: Hohai University. (in Chinese)
Zhang, S. X. 2007. 3D hydro environmental model of dissolved oxygen (DO) distribution in Yangtze Estuary. Proceedings of 20th National Conference on Hydrodynamics, 715-721. Beijing: China Ocean Press. (in Chinese)
Zhu, J. R., Liu, X. C., Shen, H. T, and Xiao, C. Y. 2003. Observation and analysis on hydrology in the Changjiang Estuary in March of 1996. Journal of East China Normal University (Natural Science), 4, 87-93. (in Chinese)
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