Accession Number:

ADA460541

Title:

Evaluation of Delft3D Performance in Nearshore Flows

Descriptive Note:

Memorandum Report

Corporate Author:

NAVAL RESEARCH LAB STENNIS SPACE CENTER MS OCEANOGRAPHY DIV

Report Date:

2006-12-28

Pagination or Media Count:

27.0

Abstract:

The Delft3D modeling system, developed by Delft Hydraulics www.wldelft.nl is capable of simulating hydrodynamic processes due to waves, tides, rivers, winds, and coastal currents. It can be used to provide surf prediction for areas with complicated bathymetry where the use of a one-dimensional surf model is inappropriate. Delft3D has many model options and free parameters. The main objective of this investigation is to examine the effects of these selections on the performance of Delft3D. Both Duck94 and NSTS Santa Barbara data were used for evaluating Delft3D performance. Many parameters and options including roller, breaker delay, and breaking dissipation formulations are evaluated. All three bottom friction formulations, i.e., Chezy, White-Colebrook, and Manning, are evaluated and all can produce good longshore current results, if proper empirical bottom friction coefficient is used. The RMS error for longshore current is about 0.2 ms.

Subject Categories:

  • Physical and Dynamic Oceanography
  • Defense Systems

Distribution Statement:

APPROVED FOR PUBLIC RELEASE