Abstract
The low salinity water lenses (LSWLes) in the expansion area of the Changjiang diluted water (CDW) exist in a certain period of time in some years. The impact of realistic river runoff, ocean currents and weather conditions need to be taken into account in the dynamical analysis of LSWL, which is in need of research. In this paper, the POM-σ-z model is used to set up the numerical model for the expansion of the CDW. Then LSWL in summer 1977 is simulated, and its dynamic mechanism driven by wind, tide, river runoff and the Taiwan Warm Current is also analyzed. The simulated results indicate that the isolated LSWL detaches itself from the CDW near the river mouth, and then moves towards the northeast region outside the Changjiang Estuary. Its maintaining period is from July 26 to August 11. Its formation and development is mainly driven by two factors. One is the strong southeasterly wind lasting for ten days. The other is the vertical tidal mixing during the transition from neap tide to spring tide.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Blumberg, A. F. and Mellor, G. L., 1987. A description of a three dimensional coastal ocean circulation model, in: Heaps N. (Ed.), Three-dimensional Coastal Ocean Models, Coastal and Estuarine Sciences, Washington: American Geophysical Union, 4, 1–16.
Chen, C. S., Xue, P. F., Ding, P. X., Beardsley, R. C., Xu, Q. C., Mao, X. M., Gao, G. P., Qi, J. H., Li, C. Y., Lin, H. C., Cowles, G. and Shi, M. C., 2008. Physical mechanisms for offshore detachment of the Changjiang Diluted Water in the East China Sea, J. Geophys. Res., 113, C02002, doi: 10.1029/2006JC003994.
Huang, D. J., Su, J. L. and Chen, Z. Y., 1996. Application of three-dimensional shelf sea model in Bohai.-II The seasonal variation of temperature, Acta Oceanologica Sinica, 4(1): 1–11. (in Chinese)
Liao, Q. Y., Guo, B. H. and Liu, Z. P., 2001. Analysis of direction change mechanism of the Changjiang River Diluted Water in summer, Journal of Oceanography of Huanghai & Bohai Seas, 19(3): 19–25. (in Chinese)
Lie, H. J., Cho, C. H., Lee, J. H. and Lee, S., 2003. Structure and eastward extension of the Changjiang River plume in the East China Sea, Journal of Geophysical Research, 108(C3): 3077, doi: 10.1029/2001JC001194.
Lv, X., Qiao, F., Xia, C. and Yuan, Y., 2007. Tidally induced upwelling off Yangtze River estuary and in Zhejiang coastal waters in summer, Science in China (Series D): Earth Science, 37(1): 133–144.
Moon, J. H., Hirose, N., Yoon, J. H. and Pang, I. C., 2010. Offshore detachment process of the low-salinity water around Changjiang Bank in the East China Sea, Journal of Physical Oceanography, 40, 1036–1053.
Pu, Y. X., 2002. The summer salinity distribution types of the 30°N profile in the East China Sea, Donghai Marine Science, 20(1): 1–13. (in Chinese)
Shen, H. T., 2001. Material Flux of the Changjiang Estuary, Beijing, China Ocean Press, 1–7. (in Chinese)
Simpson, J. H. and Hunter, J. R., 1974. Fronts in the Irish Sea, Nature, 250, 404–406.
Yuan, Y. C., Su, J. L. and Zhao, J. S., 1982. A single layer model of the continental shelf circulation in the East China Sea, La mer, 20, 131–135.
Zhang, W. J., Zhu, S. X., Dong, L. X., Zhang, C. K., 2011. A new hybrid vertical coordinate ocean model and its application in the simulation of the Changjiang diluted water, China Ocean Eng., 25(2): 327–338.
Zhu, J. R. and Shen, H. T., 1997. Expansion Mechanisms of the Changjiang Diluted Water, Shanghai, East China Normal University Press. (in Chinese)
Author information
Authors and Affiliations
Corresponding author
Additional information
This project was supported by the National Natural Science Foundation of China (Grant Nos. 40906044, 41076048 and 41376012), the Fundamental Research Funds for the Central Universities (Grant No. 2011B05714) and the Doctoral Starting up Foundation of College of Meteorology and Oceanography of the PLA University of Science and Technology, China.
Rights and permissions
About this article
Cite this article
Zhang, Wj., Zhu, Sx., Li, Xq. et al. Numerical simulation and dynamical analysis for low salinity water lens in the expansion area of the Changjiang diluted water. China Ocean Eng 28, 777–790 (2014). https://doi.org/10.1007/s13344-014-0060-1
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s13344-014-0060-1