Saltwater intrusion in the Pearl River Estuary during winter
Keywords:
flushing time, freshwater inflow, residual current, Environmental Fluid Dynamic Code model, material transportAbstract
An intensive observation and a three-dimensional finite-difference model of Environmental Fluid Dynamic Code were used to study saltwater intrusion in the Pearl River Estuary. The model simulation was carried out for December 2007 to February 2008, which covered the in situ observation. The model was forced by observed winds, tidal elevation at open boundaries, and river discharges from eight inlets in the Pearl River Estuary. The agreements with observation were verified in terms of current, salinity and tide elevation. Using the computed tidal current, the residual current was also calculated to estimate material transport. In addition, the Lagrangian method was used to track the trajectory of particles from the mouth of Humen and Modaomen inlets. By computing the flushing time of these two channels, the authors find that there exists close relationship between flushing time and saltwater intrusion. Potential impact of sea-level rise on saltwater intrusion was also studied. Sensitivity experiments indicate that sea-level rise can impact on the saltwater intrusion in the Pearl River Estuary, such as increasing salinity concentration and intrusion distance, especially during neap tide in winter (dry season).
References
Dong, L., Su, J., Wong, L., Cao, Z. and Chen, J. 2004. Seasonal variation and dynamics of the Pearl River plume. Continental Shelf Research, 24: 1761–1777.
Galperin, B., Kantan, L. H., Hassid, S. and Rosati, A. 1988. A quasi-equilibrium turbulence energy model for geophysical flows. Journal of Atmospheric Science, 45: 55–62.
Hamrick, J. M. 1996. User's manual of the environmental fluid dynamics computer code, Virginia: Virginia Institute of Marine Science/School of Marine Science, the College of William and Mary. Special Report in Applied Marine Science and Ocean Engineering No. 331
Han, G., Lu, Z., Wang, Z., Helbig, J., Chen, N. and Yong, B. 2008. Seasonal variability of the Labrador current and shelf circulation off Newfoundland. Journal of Geophysical Research, 113: C10013 doi: 10.1029/2007JC004376
He, H. 1986. Analysis of variation of tide of the Pearl River Delta. Renmin Zhujiang, 1: 22–29.
Ji, Z., Hu, G., Shen, J. and Wan, Y. 2007. Three-dimensional modeling of hydrodynamic processes in the St. Lucie Estuary. Estuarine, Coastal and Shelf Science, 73: 188–200.
Kuo, A. Y., Shen, J. and Hamrick, J. M. 1996. The effect of acceleration on bottom shear stress in tidal estuaries. ASCE Journal of Waterways, Port, Coastal and Ocean Engineering, 122: 75–83.
Li, S. and Ao, D. 2000. Rise of sea level and change of saline water intrusion at the Pearl River Estuary. Renmin Zhujiang, 6: 42–44.
Lin, J., Xie, L., Pietrafesa, L. J., Ramus, J. S. and Paerl, H. W. 2007. Water quality gradients across Albemarle-Pamlico Estuarine system: seasonal variations and model applications. Journal of Coastal Research, 23(1): 213–229.
Mao, Q., Shi, P., Yin, K., Gan, J. and Qi, Y. 2004. Tides and tidal current in the Pearl River Estuary. Continental Shelf Research, 24: 1797–1808.
Mark, F. M. and John, M. W. 2002. Sea level is rising: Do we know why?. PANS, 99: 6524–6526.
Mellor, G. and Yamada, T. 1982. Development of a turbulent closure model for geophysical fluid problems. Review of Geophysics and Space Physics, 20(4): 851–875.
Shi, X., Chen, T. and Yu, K. 2008. Sea-level changes in Zhjjiang Estuary over last 40 years. Marine Geology & Quaternary Geology, 28: 127–134.
Wong, L., Chen, J., Xue, H., Dong, L., Su, J. and Heinke, G. 2003. A model study of the circulation in the Pearl River Estuary (PRE) and its adjacent coastal waters: 1. Simulations and comparison with observations. Journal of Geophysical Research, 108(C5): 3156 doi:10.1029/2002JC001451
Wong, L., Chen, J. and Dong, L. 2004. A model of the plume front of the Pearl River Estuary, China and adjacent coastal waters in the winter dry season. Continental Shelf Research, 24: 1779–1795.
Xu, H., Lin, J. and Wang, D. 2008. Numerical study on salinity stratification in the Pamlico River Estuary. Estuarine, Coastal and Shelf Science, 80: 74–84.
Yang, Q. and Luo, X. 1999. The secular trends of sea level change in LingdingYang Estuary. Scientia Geographica Sinica, 19(2): 125–127.
Ye, J., He, Z. and Zhou, Z. 1986. Numerical model of salt transport under tidal current of the Pearl River Estuary. Renmin Zhujiang, 6: 7–15.
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