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Determination of estuary parameters on the basis of Lagrangian analysis
In: Journal of Hydraulic Engineering. American Society of Civil Engineers (ASCE): New York, NY. ISSN 0733-9429; e-ISSN 1943-7900, meer
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| Abstract |
A comprehensive hydrometric survey of an estuary can be both expensive and time consuming. Considerable economies in both cost and time can therefore be realized if some of the more difficult-to-determine parameters can be related to more readily obtainable information. In particular, the tidal prism, the tidal excursion, and the estuary mean depth are found amenable to such treatment. Such relationships can be derived from an analytical solution of St. Venant's equations in a Lagrangian reference frame, provided that the estuary shape ean be described by an exponentially varying cross section-in alluvial estuaries this is generally the case; and the velocity variation within the Lagrangian reference frame can be described by a simple harmonic-this appears to be no problem if the tidal range to depth ratio is not too large. The equations obtained have been calibrated on results obtained with a one -dimensional hydraulic model and verified with prototype data obtained from 15 estuaries in different parts of the world . The relationships obtained are sufficiently accurate for use in studies at prefeasibility level. |
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