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S. Department of Commerce National Oceanic and Atmospheric Administration National Weather Service National Centers for Environmental Prediction 5830 University Research Court College Park, MD 20740  \nTechnical Note  \nUser manual and system documentation of WAVEWATCH III  version 4 .18 †  \nHendrik L. Tolman ‡ and the WAVEWATCH III  Development Group,  \nEnvironmental Modeling Center Marine Modeling and Analysis Branch  \nMarch 2014  \n† MMAB Contribution No. 316.  \n‡ e-mail: [Hendrik.Tolman@NOAA.gov](Hendrik.Tolman@NOAA.gov)  \nThis page is intentionally left blank.  \nWAVEWATCH III version 4 .18 i  \nContents  \n1 Introduction 1  \n1.1 About this manual ........................ 1  \n1.2 Licensing terms .......................... 3  \n1.3 Copyrights and trademarks ................... 5  \n1.4 The development group ..................... 5  \n1.5 Acknowledgments ........................ 8  \n2 Governing equations 9  \n2.1 Introduction ........................... 9  \n2.2 Propagation ........................... 11  \n2.3 Source terms ........................... 12  \n2.3.1 General concepts ..................... 12  \n2.3.2 Snl: Discrete Interaction Approximation (DIA) .... 14  \n2.3.3 Snl: Full Boltzmann Integral (WRT) .......... 16  \n2.3.4 Snl: Generalized Multiple DIA (GMD) ......... 20  \n2.3.5 Snl : Nonlinear filter ................... 22  \n2.3.6 Sin + Sds: WAM cycle 3 ................. 24  \n2.3.7 Sin + Sds: Tolman and Chalikov 1996 ......... 26  \n2.3.8 Sin + Sds: WAM cycle 4 (ECWAM) .......... 32  \n2.3.9 Sin + Sds: Ardhuin et al. 2010 ............. 36  \n2.3.10 Sin + Sds: BYDRZ .................... 43  \n2.3.11 Sln: Cavaleri and Malanotte-Rizzoli 1981 ....... 49  \n2.3.12 Sbot: JONSWAP ..................... 49  \n2.3.13 Sbot: SHOWEX ...................... 50  \n2.3.14 Smud: Dissipation by viscous mud (D&L) ....... 52  \n2.3.15 Smud: Dissipation by viscous mud (Ng) ........ 53  \n2.3.16 Sdb: Battjes and Janssen 1978 .............. 54  \n2.3.17 Str: Triad nonlinear interactions (LTA) ........ 56  \n2.3.18 Sbs: Bottom scattering .................. 58  \n2.3.19 Sice: Damping by sea ice (simple) ............ 59  \n2.3.20 Sice: Damping by sea ice (Liu et al.) .......... 60  \n2.3.21 Sice: Damping by sea ice (Shen et al.) ......... 61  \n2.3.22 Sref: Energy sources at shorelines and icebergs .... 62  \n2.3.23 Second order spectrum and free infragravity waves ... 64  \n2.3.24 Sxx: User defined ..................... 68  \n2.4 Output parameters ........................ 68  \nii WAVEWATCH III version 4 .18  \n3 Numerical approaches 77  \n3.1 Basic concepts .......................... 77  \n3.2 Depth variations in time ..................... 79  \n3.3 Spatial propagation ....................... 80  \n3.3.1 General concepts ..................... 80  \n3.3.2 Traditional regular grids ................. 81  \nFirst order scheme ................. 82  \nSecond order scheme (UNO) ........... 83  \nThird order scheme (UQ) ............. 83  \n3.3.3 Curvilinear grids ..................... 86  \n3.3.4 Triangular unstructured grids .............. 87  \n3.3.5 Spherical Multiple-Cell (SMC) grid ........... 88  \n3.3.6 The Garden Sprinkler Effect .............. 94  \nNo GSE alleviation ................ 94  \nBooij and Holthuijsen 1987 ............ 95  \nSpatial averaging ................. 98  \n3.3.7 Unresolved obstacles ................... 100  \n3.3.8 Continuously moving grids ............... 101  \nGeneral concepts ................. 101  \nNumerical implementation ............ 102  \nRunning with moving grids ............ 103  \n3.3.9 Rotated grids ....................... 104  \n3.4 Intra-spectral propagation .................... 105  \n3.4.1 General concepts ..................... 105  \n3.4.2 First order scheme .................... 106  \n3.4.3 Second order scheme (UNO) .............. 107  \n3.4.4 Third order scheme (UQ) ................ 108  \n3.5 Source terms ........................... 109  \n3.6 Winds and currents ....................... 112  \n3.7 Use of tidal analysis ....................... 113  \n3.8 Ice cov","cbCaitMrV64tXFyb","https://ap.wps.com/l/cbCaitMrV64tXFyb","pdf",3542701,311,"English","# 1 Introduction\n## 1.1 About this manual\n## 1.2 Licensing terms\n## 1.3 Copyrights and trademarks\n## 1.4 The development group\n## 1.5 Acknowledgments\n# 2 Governing equations\n## 2.1 Introduction\n## 2.2 Propagation\n## 2.3 Source terms\n## 2.4 Output parameters\n# 3 Numerical approaches\n## 3.1 Basic concepts\n## 3.2 Depth variations in time\n## 3.3 Spatial propagation\n## 3.4 Intra-spectral propagation\n## 3.5 Source terms\n## 3.6 Winds and currents\n## 3.7 Use of tidal analysis\n## 3.8 Ice coverage\n## 3.9 Spectral partitioning\n## 3.10 Spatial and temporal tracking of wave systems\n## 3.11 Nesting\n# 4 Running the wave model\n## 4.1 Program design\n## 4.2 The wave model routines\n## 4.3 The data assimilation interface\n## 4.4 Auxiliary programs\n# 5 Installing the wave model\n## 5.1 Introduction\n## 5.2 Installing files\n## 5.3 Compiling and linking","[{\"question\":\"What is covered in the WAVEWATCH III version 4.18 introduction section?\",\"answer\":\"The introduction covers the purpose and scope of the manual, licensing terms, copyrights and trademarks, the development group, and acknowledgments.\"},{\"question\":\"Which topics are included under governing equations and source terms?\",\"answer\":\"Governing equations cover propagation and multiple classes of source terms, including general concepts, discrete interaction approximations, Boltzmann integral variants, nonlinear filters, and additional physical processes and parameterizations, followed by output parameters.\"},{\"question\":\"What guidance does the manual provide for running and installing the wave model?\",\"answer\":\"It describes program design, key wave model routines, the data assimilation interface, auxiliary programs and post-processors, and then covers installation, including installing files and compiling and linking.\"}]","WAVEWATCH III version 4 - User manual and system documentation - 4.18 | PDF",784]