Notes on HP1 – a software package for simulating variably-saturated water flow, heat transport, solute transport, and biogeochemistry in porous media. HP1 Version 2.2

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HP1 is a comprehensive modeling tool in terms of processes and reactions for simulating reactive transport and biogeochemical processes in variably-saturated porous media. HP1 results from coupling the water and solute transport model HYDRUS-1D (Šimůnek et al., 2009a) and PHREEQC-2 (Parkhurst and Appelo, 1999). This note provides an overview of how to set up and execute a HP1 project using version 2.2.002 of HP1 and version 4.13 of the graphical user interface (GUI) of HYDRUS-1D. A large part of this note are step-by-step instructions for selected examples involving mineral dissolution and precipitation, cation exchange, surface complexation and kinetic degradation networks. The implementation of variably-saturated flow conditions, changing boundary conditions, a layered soil profile or immobile water is also illustrated.


Original languageEnglish
PublisherSCK CEN
Number of pages99
Publication statusPublished - Jan 2010

Publication series

NameSCK•CEN Reports
PublisherStudiecentrum voor Kernenergie


  • HP1, reactive transport model, variably-saturated water flow, multicomponent solute transport, heat transport, biogeochemical processes, numerical model, HYDRUS-1D

ID: 207406