We developed a new ordinary differential equation (ODE) to represent subsurface flows from hillslope with artificial drainage (tiling) into an adjacent channel. Our ODE is based on derived storage-discharge relationship high-resolutions HYDRUS3D simulations that solve 3D partial Richards' equations for (plot scale) internal surfaces, variable soil depth, hydraulic conductivity, and varying slop...

Fertilised cropland is a potential non-point source of nitrogen contributing to the nutrient enrichment of surface water ecosystems. Nitrogen is present in drainage outflow primarily because of the addition of fertilisers. The purpose of this study is to model the nitrate leaching to surface waters using a quasi twodimensional mechanistic flow model (DRAINMOD) in combination with a GIS. The GIS...

A reliable estimate of potential evapotranspiration (PET) for a forest ecosystem is critical in ecohydrologic modeling related with water supply, vegetation dynamics, and climate change and yet is a challenging task due to its complexity. Based on long-term on-site measured hydro-climatic data and predictions from earlier validated hydrologic modeling studies, this study compared different meth...

Treatment wetlands are increasingly needed to remove nitrate from agricultural drainage water to protect downstream waters, such as the Gulf of Mexico. This project sought to develop a new edge-of-field treatment wetland, designed to remove nitrate-nitrogen and enhance phosphorus removal by plant harvest and to monitor its effectiveness. A 0.10 ha wetland was designed and installed to treat sub...

In this study, the influence of relevant parameters a subsurface pipe layout on soil water and salt transport in cotton field under mulched drip irrigation is explored. Based measured data changes groundwater level field, DRAINMOD numerical model has been used for simulating dynamics salinized drainage. The results investigation show that can accurately simulate hydrological conditions salt-lea...

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