DYNLET1: Network Model for Tidal Inlet Dynamics

by Michael Amein, Civil Analysis Group, Inc, Raleigh, United States,
Nicholas C. Kraus, Civil Analysis Group, Inc, Raleigh, United States,

Document Type: Proceeding Paper

Part of: Estuarine and Coastal Modeling


This paper introduces DYNLET1, an efficient, versatile, and accurate one- dimensional numerical model for computing tidal flow in a system of interconnecting channels and bays. Drawing upon concepts of open-channel flow, the model computes the velocity field across and along channels. A four-point implicit finite-difference representation of the one-dimensional shallow water hydrodynamic equations is developed, and the resultant system of nonlinear simultaneous equations is solved by an efficient banded matrix algorithm. The iterative numerical scheme is fast and unconditionally stable. The rapid solution scheme and convenient interface allow DYNLET1 to be operated on desk top microcomputers with run times on the order of a minute for one tidal cycle simulation. An example application to the Indian River Inlet, Delaware, system, consisting of two broad and shallow bays connected to a narrow inlet throat, is described.

Subject Headings: Tides | Computer models | Numerical models | Inlets (waterway) | Model accuracy | Flow (fluid dynamics) | Dynamic models | Hydrodynamics | Delaware | United States

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