SPATIAL AGRO-HYDRO-SALINITY MODEL
Description of Principles, User Manual,
and Examples of Application
Sahysmod is a computer program for the simulation and prediction of the salinity
of soil moisture, groundwater and drainage water, the depth of the water-table
and the drain discharge in irrigated agricultural lands under different geo-
hydrologic conditions, varying water management options, including the re-use
of groundwater for irrigation by pumping from wells (conjunctive use),and
several cropping/irrigation rotation schedules, whereby the spatial variations
are accounted for through a network of polygons.
The mathematical model also calculates actual from potential evaporation
(evapotranspiration), capillary rise, deep percolation, and groundwater flow.
Optionally, farmers' responses to irrigation and agriculture can be simulated.
Sahysmod combines the agro-hydro-salinity model SaltMod and the polygonal
ground water model SGMP of my colleague Dr.J.Boonstra.
It allows for the introduction of semi confined aquifers.
On web site www.waterlog.info For free downloads see the SahysMod page
TABLE OF CONTENTS
SahysMod gives a spatial agricultural, hydrological and
salinity model for an area divided into polygons, which
are interconnected through groundwater flow in the
The model creates various water and salt balances namely for the rootzone, the transition zone and the aquifer. The latter is called the geo-hydrologic balance. A drainage system may be placed in the transition zone.
The SahysMod software permits three subareas in each polygon with different agricultural practices and irrigation regimes. Farmers responses to changing soil conditions can be evoked.