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[edit] PIHM

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Modeler information
First name Christopher
Last name Duffy
Type of contact Project manager
Institute / Organization Penn State University
Postal address 1 212 Sackett Bldg
Postal address 2 Civil & Environmental Engineering
Town / City University Park
Postal code 16802
State Pennsylvania
Country USA
Email address cxd11@psu.edu
Phone +1 814 863-4384
Fax +1 814-863-7304


Additional modeler information
First name Mukesh
Last name Kumar
Type of contact Technical contact
Institute / Organization
Postal address 1
Postal address 2
Town / City
Postal code
State
Country
Email address
Phone
Fax


Additional modeler information
First name Gopal
Last name Bhatt
Type of contact Technical contact
Institute / Organization
Postal address 1
Postal address 2
Town / City
Postal code
State
Country
Email address
Phone
Fax


Model identity
Model type Modular
Spatial dimensions
Spatial extent
Model domain
One-line model description PIHM is a multiprocess, multi-scale hydrologic model.
Extended model description PIHM is a multiprocess, multi-scale hydrologic model where the major hydrological processes are fully coupled using the semi-discrete finite volume method. PIHM is a physical model for surface and groundwater, “tightly-coupled” to a GIS interface. PIHMgis which is open source, platform independent and extensible. The tight coupling between GIS and the model is achieved by developing a shared data-model and hydrologic-model data structure.


Model technical information
Supported platforms Unix, Linux, Mac OS, Windows
Other platform Platform independent
Programming language C, C++
Other program language
Code optimized
Start year development 2002
Does model development still take place? Yes
If above answer is no, provide end year model development
Model availability As code, As executable
Source code availability
(Or provide future intension) 		Through owner
Source web address
Program license type GPL v2
Program license type other
OpenMI compliant No but possible
CCA component No but possible
IRF interface No but possible
Memory requirements --
Typical run time --


Input - Output description
Describe input parameters PIHM is an integrated finite volume hydrologic model. It simulates channel routing, overland flow and groundwater flow in fully coupled scheme. It uses semi-discrete Finite Volume approach to discretize PDE (equations governing physical processes) into ODE to form a system of ODEs and solved with SUNDIALS solver (LBL).
PIHM incorporates an object-oriented model data structure which provides extensibility and efficient storage of data at the same time. PIHM v2.0 requires the following input files:
  • projectName.txt : This file will have the project name as its content.
  • .mesh File : Spatial information of Nodes and Irregular Meshes (TINs)
  • .att File : Attribute defining different classes an element belongs to
  • .soil File : Soil properties
  • .geol : Geologic properties
  • .lc file : Vegetation parameters of different land cover types
  • .riv file : Spatial, geometry and material information of river segments
  • .forc file : All the forcing variables (forcing time-series)
  • .ibc file : Boundary condition information for elements
  • .para file : Control parameters (solver options; model modes; error control)
  • .init : If initial condition input is through a file
  • .calib : Calibration parameters and process controls
Input format ASCII
Other input format Shape file
Describe output parameters PIHM v2.0 uses Net_CDF for state and flux output. Details are under development (April 2009) and will be complete July 2009
Output format ASCII
Other output format NetCDF
Pre-processing software needed? No
Describe pre-processing software
Post-processing software needed? No
Describe post-processing software PIHM and PIHM_GIS incorporates an object-oriented model data structure which provides extensibility and efficient storage of data at the same time. The output is stored in NET_CDF and we are currently implementing VISIT as the basic tool. VISIT will also be implemented within the PIHM_GIS interface July 2009
Visualization software needed? Yes
If above answer is yes
Other visualization software any software able to visualize gridded data (RiverTools / 3DEM)


Process description model
Describe processes represented by the model The Penn State Integrated Hydrologic Model (PIHM) is a fully coupled multiprocess hydrologic model. Instead of coupling through artificial boundary conditions, major hydrological processes are fully coupled by the semi-discrete finite volume approach. For those processes whose governing equations are partial differential equations (PDE), we first discretize in space via the finite volume method. This results in a system of ordinary differential equations (ODE) representing those procesess within the control volume. Within the same control volume, combining other processes whose governing equations are ODE’s, (e.g. the snow accumulation and melt process), a local ODE system is formed for the complete dynamics of the finite volume.
Describe key physical parameters and equations Processes include: 2-D overland flow, 2-D groundwater flow, 1-D soil moisture, 1-D channel flow, snow/melt, et, vegetation water use by NLCD,
Describe length scale and resolution constraints typically based on original DEM used to develop the watershed model
Describe time scale and resolution constraints fully implicit, time adaptive, based on the CVODE ODE solver from LBL
Describe any numerical limitations and issues Solver is efficient and accurate for very stiff systems of equations


Model testing
Describe available calibration data sets Upper Juniata River 875 km^2: see: http://sourceforge.net/projects/pihmmodel/
Upload calibration data sets if available:
Describe available test data sets Upper Juniata River 875 km^2: see: http://sourceforge.net/projects/pihmmodel/
Upload test data sets if available:
Describe ideal data for testing PIHM is a distributed watershed model that can represent surface/subsurface processes at scales ranging from a few hundred m^2 to 10,000 km^2. However, large systems will require the parallel version currently under development


Users groups model
Do you have current or future plans for collaborating with other researchers? We have several other extensions to PIHM under development: solute transport, sediment transport, 3-D Richard's Equation. Full information can be found at: http://sourceforge.net/projects/pihmmodel/


Documentation model
Provide key papers on model if any Papers:
  • Qu Y., C. J. Duffy (2007), A semidiscrete finite volume formulation for multiprocess watershed simulation, Water Resour. Res., 43, W08419, doi:10.1029/2006WR005752.
  • Kumar, M., G. Bhatt, and C.J. Duffy, 2008, The Role of Physical, Numerical and Data Coupling in a Mesoscale Watershed Model, Advances in Water Resources. under review April. 2009
  • Kumar, M., G. Bhatt, and C.J. Duffy, 2008, An efficient domain decomposition framework for accurate representation of geodata in distributed hydrologic models, International Journal of Geographical Information Science, IJGIS-2008-0069.R1
  • Kumar, M. C. J. Duffy, 2008, Object Oriented Shared Data Model for GIS and Distributed Hydrologic Models, Journal of International Journal Geographical Information Science, Accepted July 2008.
Is there a manual available? Yes
Upload manual if available:
Model website if any http://www.pihm.psu.edu/pihmgis_downloads_v2.0.0.html
Model forum / discussion board


Additional comments
Comments --


[edit] Introduction

[edit] History

[edit] Papers

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[edit] Help

[edit] Input Files

[edit] Output Files

[edit] Download

See http://sourceforge.net/projects/pihmmodel/

[edit] Source

See http://sourceforge.net/projects/pihmmodel/

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