Management System for Shallow Water Tables in Irrigation Areas
SwagSim, a Microsoft Windows application, is a SOIL, WATER and GROUND-WATER SIMULATION model. It analyzes where recharge and discharge are occurring in an irrigation subregion by tracking ground-water movement at subregional levels of irrigation bays. SwagSim can also determine how much pumping is needed to control soil salinization and to estimate rising ground-water levels and discharge into streams. SwagSim is optimized for the Windows environment with a complete graphical user interface and full mouse support for ease of use.
The fact that groundwater tends to move, at a district scale, quite independently of property boundaries, requires a management response beyond farm boundaries. SwagSim does this by noting where recharge and discharge is occurring, and tracking groundwater movement at the district (or subregional) scale. SwagSim accounts for water balance processes in an irrigation area through three modules. The first uses data on rainfall irrigation applications, daily air temperature, wind and radiation to calculate the amount of water entering or leaving the soil at the land surface. This calculation (of net flux) uses a modified Penman model. The second estimates daily recharge or discharge to the water table. It uses the net flux calculated above, depth to the water table and data on soil properties. A transient analytical solution for Richards' equation is used for this purpose. The third module estimates changes to groundwater levels. Hydrological conditions are taken into account, and a finite-difference groundwater flow model is used. These modules allow SwagSim to model regional water table fluctuations to locate recharge or discharge zones, and to calculate the rates of these processes. It can also determine how much pumping is needed to control salinization and estimate groundwater discharge into streams.
- Model Crop Water Use, Unsaturated Flow in Soils, Surface Runoff, Recharge to Water Table and Ground-Water Flow
- Model Hydraulics of Water Wells, Rivers, Drains and Evaporation Basins
- Variable Boundary Conditions
- Meaningful Icons for Climate, Irrigation, Land Use, Pumps and Rivers
- Standard Windows Interface with Mouse Control
- Graphical Display of Input and Output
- Data Analysis Using Microsoft Access
Swagsim is a two-part application. You can create and maintain a database of data for a simulation and run models against this data or variants of it. Each session loads a temporary copy of the selected database. Any modifications to the data will effect simulations run during the session, but will only become permanent if the are saved when the session is ended.
- Water and Salinity Management in Irrigation Areas
- Evaluate Drainage Options for Water Logging and Salinity Control
- Crop Impact Studies
- Design Artificial Recharge and Evaporation Basins
- Land Management
- Management of Shallow Water Tables
- Recharge/Discharge Studies
- Ground-Water Pumping
The data is held in a Microsoft Access Version 1.1 database to allow simple reporting and data extraction if you have a copy of Microsoft Access. It is not necessary to own Microsoft Access unless you wish extract data.
Data can be imported into an existing database, or used to create a new database.
Imported Data Formats
Format of Ascii text files that can be imported. All dates should be DD-MMM-YY format
data "Boundary Flux"
row column fixed-boundary-flux
data "Constant Heads"
data "Evaporation Basins"
row column start-data end-date area-in-square-meters leakance
data "Field Cells"
field field-number number-of-cells
field field-number-2 number-of-cells
cell width full-cell-width-in-meters height full-cell-height-in-meters
grid rows number-of-rows columns number-of-columns
row column cell-width cell-height
Initial Confined Piezolevels
data "initial piezolevel confined"
row column piezolevel
Initial Unconfined Piezolevels
data "initial piezolevel unconfined"
row column piezolevel
field-id start-date end-date total-volume-in-mega-litres
row column leakance
data "land use"
field-id start-date end-date "crop"
Link Soil to field
data "field soil type"
data "Mole Drain"
row column depth-in-meters area-in-square-meters
No Flow Boundary Conditions
data "no flow"
row column pump-id start-date end-date volume-in-megaliters-per-day
data "River Cells"
row column Kv river-length river-width bed-thickness head bottom
486/Pentium running Windows 95/NT with 12 MB free hard disk space.
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Τελευταία Ενημέρωση 27 Ιουλίου 2004 - Last Revised on July 27, 2004
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