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Title: NMLONG: numerical model for simulating longshore current. Report 2, Wave-current interaction, roller modeling, and validation of model enhancements
Authors: Larson, Magnus
Kraus, Nicholas C.
Keywords: Breaking waves
Longshore currents
Numerical model
Tidal inlets
Wave blocking
Wave-current interaction
Wave roller
Wave setup
Wind-generated currents
Coastal Inlets Research Program (U.S.)
Publisher: Engineer Research and Development Center (U.S.)
Series/Report no.: Technical report (Engineer Research and Development Center (U.S.)) ; no.ERDC/CHL TR-02-22 rept.2
Abstract: The Numerical Model of the Longshore current (NMLong) was originally developed under the U.S. Army Corps of Engineers’ Dredging Research Program. It calculates nearshore wave transformation, water level change, and wave-induced longshore current across a single beach profile, under the assumption of longshore uniformity in both the profile and hydrodynamic processes. In considering the nearshore more generally, and the waves at an inlet entrance in particular, both tidal and wind-generated currents can be comparable to or exceed the strength of the wave-generated longshore current. Also, currents produced independently by waves and by wind and tide may be in opposite directions, producing complex distributions of the current across the shore. The capability of representing the action of currents in NMLong and the interaction between the current and waves resulted in a new model with the modified name NMLong-CW, where CW stands for the interaction between currents and waves. The new model includes an algorithm to simulate the contribution of wave rollers generated by breaking waves, improving agreement of calculations to measurements of the longshore current on a beach profile with a longshore bar. This report documents the theoretical developments associated with the enhancement of NMLong that have extended it to NMLong-CW. The new model is validated by sensitivity tests and through comparison of calculations to both field and laboratory measurements of waves and currents. Wave transformation at a long, narrow inlet, resulting in changes in wave steepness as well as wave blocking, is described.
Description: Technical Report
Gov't Doc #: ERDC/CHL TR-02-22 rept.2
Rights: Approved for public release; distribution is unlimited
Appears in Collections:Technical Report
Technical Report

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