Simulation of water flow in soil proposed the new software

Soil water simulation models require a description of root water uptake. In this study, water flow model including proposed model were compared based on field measurement under the same condition in Lysimeter. Tube-time domain reflectometry (TDR) was used to measure soil volumetric water content. Root water uptake model includes root density distribution function, potential transpiration and soil water stress-modified factor. The root water uptake model was developed, and linked into a soil water dynamic model to enable simulation of water movement in soil via numerical solution of Richards’s equation. The outputs from the model are compared against the measured water content data. Simulated and measured water contents were in excellent agreement. Analysis of residual errors, differences between measured and simulated values, can be used to evaluate model performance. These are root mean square error (RMSE), modeling efficiency (EF), and coefficient of residual mass (CRM). Results show that maximum root water uptake was 0.023 m3m3d-1 at depth 15-25 cm and minimum was 0.003 m3m3d-1 at depth 60 cm.

Keywords:

Numerical solution , Richards’ equation , Root distribution , Water flow