Estimating nearshore wave transformation and wind-wave growth is a critical component of many coastal engineering projects, e.g., predicting shoreline change, designing and maintaining coastal structures, and simulating coastal storm events. Performing physical model studies or gathering field data is not always a feasible option, and, as a result, the use of numerical models for simulating these complex coastal hydrodynamics has become a universal practice. STWAVE (STeady-state spectral WAVE), a nearshore spectral wave model, was developed by the U.S. Army Engineer Research and Development Center (ERDC), Coastal and Hydraulics Laboratory (CHL) to accurately simulate nearshore wave propagation and transformation including refraction, shoaling, breaking, and wind-wave generation. Recently, CHL has further enhanced STWAVE to include both half-plane and full-plane capabilities within a single executable; improved and streamlined file formats; and made it Earth System Modeling Framework (ESMF) compliant, which allows for easier coupling to other models. STWAVE now runs in serial mode as well as parallel in time or space on both personal computing (PC) and high-performance computing (HPC) systems. This report describes STWAVE version 6.0 capabilities, features, theory, and implementation. In depth descriptions of model parameters and examples of the new file formats are also provided. DISCLAIMER: The contents of this report are not to be used for advertising, publication, or promotional purposes. Citation of trade names does not constitute an official endorsement or approval of the use of such commercial products. All product names and trademarks cited are the property of their respective owners. The findings of this report are not to be construed as an official Department of the Army position unless so designated by other authorized documents.

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