IMPACTS OF DEEP WATERWAY PROJECT ON LOCAL CIRCULATIONS AND SALINITY IN THE CHANGJIANG ESTUARY, CHINA

Jianzhong Ge, Pingxing Ding, Changsheng Chen

Abstract


With an aim to improve and maintenance water depth along the navigational channel, the Deep Waterway Project has been conducted in the Changjiang Estuary. The structures of dikes and groins have greatly changed the local circulation with the combined effects of astronomical tide and strong freshwater discharge. A high-resolution fully three-dimension unstructured-grid model (FVCOM) has been applied to study the complicated hydrodynamics with the implementation of unstructured-grid dike-groin module. With the model validation with observation data, the simulation shows the dikes and groins has converted the rotational current into reciprocating flow along the navigational channel between the dikes, and produced the geometrically controlled eddies. The significant southward crossover current was produced along the dike during high tide when the water level is higher than the dike height. The strong saltwater intrusion is also revealed in the observation and model simulation.

Keywords


Deep Waterway Project; dikes; unstructured-grid modeling

References


Chen, J., H. Shen and C. Yun, (1988). Morphological processes and evolutions in the Changjiang Estuary. Shanghai Science and Technology Press, pp1-3 (in Chinese)

Chen, C., G. Cowles and R. C. Beardsley, (2006a). An unstructured grid, finite-volume coastal ocean model: FVCOM User Manual. Second Edition. SMAST/UMASSD Technical Report-06-0602, pp 45.

Chen, C., R. C. Beardsley and G. Cowles, (2006b). An unstructured grid, finite-volume coastal ocean model (FVCOM) system. Special Issue entitled "Advance in Computational Oceanography", Oceanography, vol. 19, No. 1, 78-89.http://dx.doi.org/10.5670/oceanog.2006.92

Delft3d-Flow User Manual, (2008) Simulation of multi-dimensional hydrodynamic flows and transport phenomena, including sediments, Deltares, Rotterdamseweg 185, p.o. box 177, 2600 MH Delft, The Netherlands Ge, J., Ding. P., Chen. C. and Xue. P., (2008), Low-salinity plume in the Changjiang and adjacent coastal regions: a model-data comparison, Proceedings of the 31st International Conference of Coastal Enginnering 2008, Hamburg, Germany, pp4471-4481

Ge, J., C. Chen, J. Qi, P. Ding, and R. C. Beardsley, (2010), Development of A Dike-Groyne Module in A Three-Dimensional Terrain-Following Coordinate Coastal Ocean Model (FVCOM): A Tool for River-Coast Ocean Engineering Applications, submitted to Journal of Waterway, Port, Coastal, and Ocean Engineering

HU, F., H. Hu and G. Gu, (2002). Studies of fronts in the Changjiang Estuary, East China Normal University Press, pp35, (in Chinese)

Hu, K. and Ding, P., (2009). The effect of deep waterway constructions on hydrodynamics and salinities in Yangtze estuary, China. Journal of Coastal Research. SI 56 (Proceedings of the 10 th International Coastal Symposium),961-965. Lisbon, Portugal, ISSN 0749-0258

Liu, J., (2008). Study on morphological evolution and siltation in deep waterway due to channel reconstruction in the North Passage, Yangtze Estuary. Doctoral degree thesis of the East China Normal University, pp38-55. (in Chinese)

Pan, L, P. Ding and J. Ge. (2010). Analysis of the influence of Deep Waterway Project on the morphological change in the North Passage of Changjiang Estuary. China. Journal of Sedment Research. (in press)

Wu, H., (2006). Saltwater Intrusion in the Changjiang Estuary----Impacts of Saltwater Spilling Over, Deep Waterway Project and Winter Monsoon. Doctoral degree thesis of the East China Normal University, pp106-125. (in Chinese)


Full Text: PDF

Creative Commons License
This work is licensed under a Creative Commons Attribution 3.0 License.