Welcome to the users page for the WRF-Hydro modeling system. The WRF-Hydro modeling system has been developed by the National Center for Atmospheric Research and its research partners through the generous support of the U.S. National Science Foundation and through research projects supported by the U.S. National Aeronautics and Space Adminsitration (NASA) and the U.S. National Oceanic and Atmospheric Administration (NOAA).
The WRF-Hydro system was originally designed as a model coupling framework designed to facilitate easier coupling between the Weather Research and Forecasting model and components of terrestrial hydrological models. WRF-Hydro is both a stand-alone hydrological modeling architecture as well as a coupling architecture for coupling of hydrological models with atmospheric models. WRF-Hydro is fully-parallelized to enable its usage on clusters and high performance computing systems alike. Like the WRF model it does not attempt to prescribe a particular or singular suite of physics but, instead, is designed to be extensible to new hydrological parameterizations. Although it was originally designed to be used within the WRF model, it has evolved over time to possess many additional attributes as follows:
The Weather Research and Forecasting Model Hydrological modeling extension package (WRF-Hydro) is a new community-based model coupling framework designed to link multi-scale process models of the atmosphere and terrestrial hydrology. The underlying goal of WRF-Hydro development is to improve prediction skill of hydrometeorological forecasts using science-based numerical prediction tools. To support this goal, hydrometeorological scientists at NCAR, in collaboration with university researchers and federal agencies, have built an extensible, multi-scale coupling architecture to link weather and climate models with hydrological component models (figure below). The system provides the capability to perform coupled and uncoupled multi-physics simulations and predictions of terrestrial water cycle processes on a wide range of spatial and temporal scales.
Designed to operate on the National Science Foundation’s (NSF) high performance computing platforms, the WRF-Hydro system leverages many existing and emerging standards in data formats, pre-/post-processing workflows and parallel computing libraries. The architecture is intended to significantly simplify the often laborious task of integrating, or coupling, existing and emerging hydrological models into the WRF modeling framework. In doing so, an extensible, portable and scalable environment for hypothesis testing, sensitivity analysis, data assimilation and environmental prediction has emerged. The WRF-Hydro system is also adopting a ‘community-based’ development processes with an open and participatory working group environment. NCAR in collaboration with other NSF and university entities are developing a support structure for WRF-Hydro in the way of model documentation, public, online code repositories, a library of user cases and many pre- and post-processing utilities.
The WRF-Hydro system has been applied for a wide range of research and operational prediction problems both in the U.S. and abroad. Specific past projects include flash flood prediction, regional hydroclimate impacts assessment, seasonal forecasting of water resources and land-atmosphere coupling studies.
This is the formal release WRF-Hydro source code version 3.0. The tarfile contains the code necessary for both fully-coupled runs with the WRF model version 3.7 and offline or 'uncoupled' runs where meteorological forcing is provided externally by the user. To perform coupled runs, users need to "untar" the tarfile under the WRF 3.7 root directory, which is the same directory level as the "main/" directory in the WRF model. Doing so will overwrite any existing "hydro/" directory if there is one. For users not running WRF_Hydro coupled to WRF they may untar and build the code where they wish.
WRF-Hydro v3.0 Change Log
This pdf file contains a list of major changes to the WRF-Hydro modeling system contained within version 3.0.
Until further notice, please cite the WRF-Hydro system as follows:
Gochis, D.J., W. Yu, D.N. Yates, 2013: The WRF-Hydro model technical description and user's guide, version 1.0. NCAR Technical Document. 120 pages. Available at: WRF-Hydro 1.0 User Guide
Gochis, D.J., W. Yu, D.N. Yates, 2014: The WRF-Hydro model technical description and user's guide, version 2.0. NCAR Technical Document. 120 pages. Available at: WRF-Hydro 2.0 User Guide
Below we provide a set of example test cases users can use to familiarize themselves with the configuration and execution of the WRF-Hydro system. The cases are separated by fully-coupled (with WRF) versus stand-alone (uncoupled) model configurations. Different cases also use different forcing data sets to users can have examples of what some of the forcing data options are.
V.I.P.: Users need to build the code (i.e. executable files) on their own machines. Please refer to the User Documentaion for support on how to build the stand-alone WRF-Hydro and fully-coupled WRF/WRF-Hydro executables.
Test Case 1: Simple small watershed with idealized forcing
Example test case for a single small watershed (Boulder Creek, Colorado) using idealized forcing. This test case shows examples of the Noah and NoahMP LSMs driven by idealized forcing (FORC_TYP = 4). No external forcing datasets are provided or required for this test case. This test case is a good case for testing if the WRF-Hydro compilation is successful.
Test Case 2: Regional WRF-Hydro test case with 2 different forcing types
Example test case for stand-alone/uncoupled WRF-Hydro run with either the Noah or NoahMP land surface models. This test case covers the Colorado Front Range region. The Noah and NoahMP LSMs are configured on a dx=1km grid and the routing grid is configured with dx=100m. Input forcing data for this WRF-Hydro run is provided in both standard, preprocessed input format (i.e. 'LDASIN' files - FORC_TYP = 1) or in native (unmanipulated) wrf model output (i.e. 'wrfout' files - FORC_TYP = 3) in netcdf format. [Note that the time window of the different forcing data is different so users need to edit the namelists to reflect those different run times.] Users should consult the User Document for more specific descriptions on the namelist settings and data formats.
NoahMP Test Case
Alternative forcing data for Noah and Noah-MP example test cases over the Front Range domain. The data contained in the following zip file contains gridded meteorological forcing data derived from the NASA NLDAS2 data base and the NOAA/NWS MPE precipitation product. Users will need to put this data into a directory and edit their namelists to point to this data. This data meets the format requirements for FORC_TYP = 1 or FORC_TYP = 6 in the namelist.input files. See User Documentation for a more complete description of forcing data formats. Gridded Forcing Data
This tarfile contains an example test case for WRF-Hydro run in a fully-coupled mode with the WRF model v3.7. All data necessary to run this test case and a simple README instruction file is provided. Testing data with WRF3.7 fully coupled
Arc-GIS Tools for Preparing WRF-Hydro Routing Grids:
To help WRF-Hydro users create surface input data for WRF-Hydro we have created a couple sets of tools. Presently these tools consist of scripts for use with the ArcGIS Geographical Information System. This is a stand-alone set of scripts which ArcGIS users can install and run locally on their own systems. ArcGIS is a licencsed and proprietary piece of software and we recognize that not all WRF-Hydro users will have access to it. Instructions on how to install and use the stand-alone tool are provided in the .pdf file contained within the download zip files. We have also included here some example test data which contains a sample geogrid domain file and topographic dataset which which users can gain experience in using the stand alone tool. Final result data is also contained in the sample data zipfile so users can compare their results against those created at NCAR. User-generate results should match the packaged results data closely. Lastly, it requires noting that the input file created by these tools should not be deemed as definitive and accurate for every application. Preparation of hydrologic network data (such as channel networks and station data) is inherently an iterative process fraught with geospatial data uncertainties. Therefore we encourage users to closely examine the outputs from the tools provided here and make their own necessary adjustments.
Below are several utility scripts that are useful in pre-processing data for input into WRF-Hydro.
Please see the Support page for additional information regarding the WRF-Hydro and links to various support tools.
A community-contributed tool box for managing, analyzing, and visualizing WRF Hydro input and output files in R.
Intentionally, "rwrfhydro" can be read as "our wrf hydro". The purpose of this R package is to focus community development of tools for working with and analyzing data related to the WRF Hydro model. These tools are both free and open-source, just like R, which should help make them accessible and popular.
R is freely available from CRAN (the Comprehensive R Archive Network) along with over 6500 add-on packages for special purposes. While rwrfhydro is not available on CRAN (and may never be), it is available on github and can easily be installed as described in the README file.
For users new to R, several introductory resources are listed at the bottom of the README.
For users who wish to contribute to the code base, there are also explicit details in the README.
The rwfhydro NEWS details the latest changes to rwrhydro.
Further details are listed below in a CRAN-like package overview.
Please browse the rwrfhydro vignettes which provide working examples with output and illustrate application of rwrfhydro to WRF-Hydro modeling. Two example images are shown below for the Fourmile test domain.
Until further notice, please cite rwrfhydro as follows:
McCreight, J.L., Dugger, A., Gochis, D.J., 2015: The rwrfhydro R package.
Available at http://www.ral.ucar.edu/projects/wrf_hydro
A community-contributed tool box for managing, analyzing, and visualizing WRF Hydro input and output files in R. See the github repository README file for more information.
This User's Guide describes the WRF-Hydro model coupling architecture and physics options, released in April 2013. As the WRF-Hydro system is developed further, this document will be continuously enhanced and updated. Please send feedback to firstname.lastname@example.org
This document is complementary to the main Weather Research and Forecasting (WRF) model User's Guide and technical document http://www.mmm.ucar.edu/wrf/users/docs/arw_v3.pdf, which describes the equations, numerics, boundary conditions, and nesting etc. of the WRF model in greater detail. To the degree practicable, this document parallels the structure of the WRF model documents.
Until further notice, please cite the WRF-Hydro system as follows:
Gochis, D.J., W. Yu, D.N. Yates, 2013: The WRF-Hydro model technical description and user's guide, version 1.0. NCAR Technical Document. 120 pages. Available online at: http://www.ral.ucar.edu/projects/wrf_hydro/
WRF-Hydro users who use the Noah land surface model will find information specific to the Noah and NoahMP LSM and the accompanying 'High Resolution Land Data Assimilation System (HRLDAS)' at http://www.ral.ucar.edu/research/land/technology/lsm.php
WRF-Hydro users who are interested in using the NASA Land Information System (LIS) with WRF-Hydro will find information specific to LIS athttp://lis.gsfc.nasa.gov/. Note: The coupling to LIS is presently at a prototype stage and no user support for this is presently available.
WRF-Hydro users who are interested in using the NCAR Community Earth System Model/Community Land Model (CESM/CLM) with WRF-Hydro will find information specific to those models at http://www.cgd.ucar.edu/tss/clm/. Note: The coupling to CESM/CLM is presently at a prototype stage and no user support for this is presently available.
BY USING OR DOWNLOADING THIS SOFTWARE, YOU AGREE TO BE BOUND BY THE TERMS AND CONDITIONS OF THIS AGREEMENT.
On this page is an archive of resources that may be useful for working with the WRF-Hydro system.
Weather Research and Forecasting model:http://www.mmm.ucar.edu/wrf/users/
Coomunity Earth System Model: http://www.cesm.ucar.edu/
NASA-Land Information System: http://lis.gsfc.nasa.gov/
netcdf command operators (nco): http://nco.sourceforge.net/
netcdf command langauge (ncl): http://www.ncl.ucar.edu/