]> 2026-05-01T08:37:52-06:00 Model:PIHM 3002 en -- Mukesh Gopal Kumar Bhatt Technical contact No but possible 1971 University Park 1 No but possible No but possible United States 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/ Upper Juniata River 875 km^2: see: http://sourceforge.net/projects/pihmmodel/ Upper Juniata River 875 km^2: see: http://sourceforge.net/projects/pihmmodel/ 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 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).<br>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 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, typically based on original DEM used to develop the watershed model Solver is efficient and accurate for very stiff systems of equations PIHM v2.0 uses Net_CDF for state and flux output. Details are under development (April 2009) and will be complete July 2009 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. fully implicit, time adaptive, based on the CVODE ODE solver from LBL Yes 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. +1 814-863-7304 Christopher 26 ASCII Shape file Penn State University Duffy 1.37 Yes -- Hydrology As code basins continental Modular http://www.pihm.psu.edu/pihm_home.html pihm multiprocess multi-scale model finite volume method major hydrological processes semi-discrete finite volume multi-scale hydrologic model multi-scale hydrologic volume method major hydrological hydrological processes processes are fully fully coupled semi-discrete finite finite volume hydrologic model gis interface basins continental 55 PIHM is a multiprocess, multi-scale hydrologic model. ASCII NetCDF +1 814 863-4384 false 212 Sackett Bldg Civil & Environmental Engineering 16802 false GPL v2 C C++ -- Through web repository http://sourceforge.net/projects/pihmmodel/ 2002 Pennsylvania Unix Linux Mac OS Windows Platform independent Project manager true any software able to visualize gridded data (RiverTools / 3DEM) 2009-04-10T15:48:35Z 2454932.1587384 2020-09-17T02:17:59Z 2459109.5958218 PIHM 3002 0 plainlist 1 [[:Model:PIHM]] PIHM# QUERY77df6a8751dc3a5e3fba003c5ef9b8a0 3002 1 plainlist 5 [[User:+]] [[First name member::Christopher]] [[Last name member::Duffy]] PIHM# QUERYd933e3442a58b19c16085acd2b21bf90 3002 1 ul 5 [[Model:+]] [[First name::Christopher]] [[Last name::Duffy]] PIHM# QUERY28cbb99e800ff56143f9c36f0ee4e148