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V51 Changes
===========

Version 51 introduced several important enhancements and bugfixes over the previous release. This page documents the major changes and improvements implemented in this version.

NetCDF Support and Standards
----------------------------

* Updated CF-UGRID Compliance to v.0.9.0 (P.C. Kerr)
* Fixed station coordinate handling in netCDF files for both 2D and 3D outputs (Jason Fleming)
* Improved metadata handling and updates for hotstart files (Jason Fleming)
* Enhanced parallel netCDF I/O operations (Jason Fleming)
* Fixed 3D netCDF hotstart issues in parallel execution (Jason Fleming)

Meteorological Forcing
----------------------

* Added support for GFDL meteorological data (NWS=±16) (T.C. Massey)
* Enhanced wind interpolation and pressure handling for GFDL format (T.C. Massey)
* Improved blended wind handling for NWS=±29 (Zach Cobell)
* Fixed issues with NWS=8 (symmetric Holland) pressure units (Jason Fleming)
* Enhanced GFS (NWS=10) meteorological input processing (Jason Fleming)
* Added support for blank wind/pressure snapshots in GFDL format (T.C. Massey)

SWAN Coupling
-------------

* Added WaveWindMultiplier capability for wind speed adjustment (Casey Dietrich)
* Improved SWAN wind field handling for blended winds (Zach Cobell)
* Fixed timing issues in SWAN output writing (Zach Cobell)
* Updated Manning's n lower limit for SWAN calculations (P.C. Kerr)
* Enhanced SWAN makefile and compilation support (Casey Dietrich)

Parallel Processing
-------------------

* Improved handling of external station files (T.C. Massey)
* Enhanced subdomain processing and file handling (T.C. Massey)
* Fixed issues with array extents for external flux boundaries (Jason Fleming)
* Optimized fort.88 file processing with 256 subdomain limit (T.C. Massey)
* Improved parallel I/O operations for various file types (Jason Fleming)

Output Processing
-----------------

* Added capability to track timestep numbers for max/min values (T.C. Massey)
* Enhanced max/min value handling during hotstart (T.C. Massey)
* Improved time varying tau0 output formatting (Jason Fleming)
* Fixed station interpolation for wet/dry states (Jason Fleming)
* Enhanced status update formatting for large node numbers (T.C. Massey)

Build System and Compilation
----------------------------

* Added compiler flags for multiple HPC systems:
  * Garnet at ERDC (Jason Fleming)
  * Diamond at ERDC (Jason Fleming)
  * Spirit at AFRL (Jason Fleming)
  * IBM Power7 systems (Jason Fleming)
  * Topaz, SGI ICE X (T.C. Massey)
* Enhanced SWAN compilation support (Casey Dietrich)
* Improved makefile configurations (Jason Fleming)

Boundary Conditions
-------------------

* Fixed handling of two-node boundaries (Jason Fleming, T.C. Massey, Casey Dietrich)
* Enhanced flux boundary condition processing (Jason Fleming)
* Improved periodic river flux boundary handling (Jason Fleming)
* Fixed array handling for boundary types (Jason Fleming)

Bugfixes
--------

* Corrected hotstart time step handling (Jason Fleming)
* Fixed issues with ramp value initialization (Jason Fleming)
* Enhanced error checking for fort.13 and mesh node counts (Jason Fleming)
* Improved handling of meteorological data timing (Jason Fleming)
* Fixed various memory allocation and array handling issues (Jason Fleming)
* Corrected elemental slope limiter handling (Zach Cobell)
* Fixed GFDL interpolation issues (T.C. Massey)