Investigation of Long-Term Transport in Tanshui River Estuary, Taiwan
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 127, Issue 2
Abstract
The net, long-term transport of materials in estuaries is governed primarily by the residual (or tidally averaged) circulation in the system. Knowledge of the residual circulation is essential for predicting the transport of algal patches, debris, and pollutants of concern in an estuary. A real-time, two-dimensional, laterally averaged hydrodynamic model is used to analyze residual current and salinity distributions in the Tanshui River estuary. The model results were filtered to arrive at the subtidal, or residual quantities. The characteristic two-layered estuarine circulation prevails for most of the time at Kuan-Du station near the river mouth. Though the circulation strengthens with increasing river discharge at low flow, its strength decreases at moderate river discharge and the two-layered circulation ceases at moderately high flow. This implies a weak trapping capacity in the estuary. At the upriver stations where salinity is lower, strength of circulation generally decreases with increasing river discharge. The response of residual velocity to the spring-neap cycle indicates stronger residual circulation during neap tide than spring tide.
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References
1.
Chang, R. C., and Shi, T. T. ( 1989). “An investigation of tidal characteristics in the lower Tanshui River.” Geographic Studies, 13, 1–55 (in Chinese).
2.
Fischer, K. ( 1980). “Salinity intrusion models.” Modelling of estuarine physics: Lecture notes on coastal and estuarine studies, Vol. 1, J. Sundermann and K. P. Holx, eds., Springer, New York, 232–241.
3.
Geyer, W. R. ( 1993). “How does variation in vertical mixing affect the estuarine circulation?” Proc., 12th Int. Estuarine Res. Fedn. Conf.
4.
Hansen, D. V., and Rattray, M. Jr. ( 1965). “Gravitational circulation in straits and estuaries.” J. Marine Res., 23, 104–121.
5.
Hsu, M. H. ( 1998). “The influence on hydrodynamics in the Tanshui River system due to flood protection policy at Kuan-Du plain and Sheh-Tse Island.” Tech. Rep. No. 308, Hydrotech Research Institute, National Taiwan University, Taipei, Taiwan (in Chinese).
6.
Hsu, M. H., Kuo, A. Y., Kuo, J. T., and Liu, W. C. ( 1996). “Study of tidal characteristics, estuarine circulation and salinity distribution in Tanshui River system (1).” Tech. Rep. No. 239, Hydrotech Research Institute, National Taiwan University, Taipei, Taiwan (in Chinese).
7.
Hsu, M. H., Kuo, A. Y., Kuo, J. T., and Liu, W. C. ( 1997). “Study of tidal characteristics, estuarine circulation and salinity distribution in Tanshui River system (2).” Tech. Rep. No. 273, Hydrotech Research Institute, National Taiwan University, Taipei, Taiwan (in Chinese).
8.
Hsu, M. H., Kuo, A. Y., Kuo, J. T., and Liu, W. C. (1999). “Procedure to calibrate and verify numerical models of estuarine hydrodynamics.”J. Hydr. Engrg., ASCE, 125(2), 166–182.
9.
Hsu, S. S. ( 1969). “A study of the tidal unsteady flow in the lower Tanshui River.” Water Conservancy, 7, 38–49 (in Chinese).
10.
Ianniello, J. P. ( 1977). “Tidally-induced residual currents in estuaries of constant breadth and depth.” J. Phys. Oceanography, 35(4), 755–786.
11.
Ianniello, J. P. ( 1981). “Comments on tidally induced residual currents in estuaries: Dynamics and near-bottom flow characteristics.” J. Phys. Oceanography, 11, 126–134.
12.
Jay, D. A., and Smith, J. D. ( 1990). “Residual circulation in shallow estuaries. 1: Highly stratified, narrow estuaries.” J. Geophys. Res., 95, 711–731.
13.
Kuo, A. Y., Hamrick, J. M., and Sisson, G. M. ( 1990). “Persistence of residual currents in the James River Estuary and its application to mass transport.” Residual currents and long-term transport: Coastal and estuarine studies, R. T. Cheng, ed., Springer, New York, 389–401.
14.
Kuo, A. Y., and Park, K. ( 1995). “A framework for coupling shoals and shallow embayments with main channels in numerical modeling of coastal plain estuaries.” Estuaries, 18(2), 341–350.
15.
Ouyang, C. F. ( 1971). “Investigation of water pollution and self-purification in the Tanshui River.” Taiwan Water Conservancy, 19(3), 67–77 (in Chinese).
16.
Park, K., and Kuo, A. Y. ( 1993). “A vertical two-dimensional model of estuarine hydrodynamics and water quality.” Spec. Rep., Appl. Marine Sci. and Oc. Engrg., Rep. No. 321, Virginia Institute of Marine Science, Gloucester Point, Va.
17.
Park, K., and Kuo, A. Y. ( 1994). “Numerical modeling of advective and diffusive transport in the Rappahannock Estuary, Virginia.” Estuarine and Coast. Modeling III: Proc., 3rd Int. Conf. on Estuarine and Coast. Modeling, M. L. Spauding et al., eds., ASCE, Reston, Va., 461–474.
18.
Park, K., and Kuo, A. Y. ( 1996a). “Effect of variation in vertical mixing on residual circulation in narrow, weakly nonlinear estuaries.” Buoyancy effects on coastal and estuaries dynamics: Coastal and estuarine studies, D. G. Aubrey and C. Friedrichs, eds., American Geophysical Union, Washington, D.C., 301–317.
19.
Park, K., and Kuo, A. Y. ( 1996b). “A numerical model study of hypoxia in the tidal Rappahannock River of Chesapeake Bay.” Estuarine, Coast. and Shelf Sci., 42(5), 563–581.
20.
Pritchard, D. W. ( 1956). “The dynamic structure of a coastal plain estuary.” J. Marine Res., 15, 33–42.
21.
Pritchard, D. W. ( 1960). “The movement and mixing of contaminants in tidal estuaries.” Waste disposal in the marine environment, E. A. Pearson, ed., Pergamon, Tarrytown, N.Y., 512–525.
22.
Rigter, B. P. (1973). “Minimum length of salt intrusion in estuaries.”J. Hydr. Div., ASCE, 99(9), 1475–1496.
23.
Water Resource Planning Commission. ( 1989). “Harmonic analysis of tidal elevations at Shy-Tzyy-Tour and Tu-Ti-Kung-Pi in the Tanshui River” (in Chinese).
24.
Yen, C. L., and Hsu, M. H. ( 1982). “Numerical simulation of unsteady flow in river system.” Hydr. Rep. No. 7105, Civil Engineering Department, National Taiwan University, Taipei, Taiwan (in Chinese).
Information & Authors
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Published In
Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 127 • Issue 2 • April 2001
Pages: 61 - 71
History
Received: Dec 28, 1999
Published online: Apr 1, 2001
Published in print: Apr 2001
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