Simulation of water flow in a field soil using pedotransfer function

摘要

In this study, focus on estimating the water retention and hydraulic conductivity of unsaturated zone through soil textural analysis, carrying out simulation flow in unsaturated zone using HYDRUS 2D model, comparing the soil hydraulic properties of the unsaturated zone of tank clustered catchment. Sindapalli Uppodai a sub basin, of Vaippar river basin in Tamilnadu was selected for this study. Soil samples were collected at different location at different depths (0-30, 30-60 and 60-90 cm). HYDRUS 2D is developed for simulating water movement in unsaturated zones by integrating the two dimensional transient unsaturated water flow equation (Richard's equation) with a root water extraction term (sink), and also incorporates pedo-transfer functions (PTF)for estimating soil hydraulic properties. The measured or estimated hydraulic properties with formulations such as Darcy's law and Richards' equation were used for finding the movement of water in the unsaturated zone. The flow rate of water is often used in irrigation scheduling.