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North Carolina State University (2014)

Numerical Simulation of Soil-water Distribution and Root Uptake from Subsurface Drip Irrigation Considering its Design and Management Parameters Using Hydrus-2D

Kong, Vireak

Titre : Numerical Simulation of Soil-water Distribution and Root Uptake from Subsurface Drip Irrigation Considering its Design and Management Parameters Using Hydrus-2D.

Auteur : Kong, Vireak

Université de soutenance : North Carolina State University

Grade : Master of Science (MS) 2014

Résumé
Subsurface drip irrigation (SDI) systems in the United States are gaining interest since they supply water directly to the root zone, and minimize water loss due to soil evaporation. SDI implementation is increasing even in semi-humid to humid regions such as the southeast. SDI potential lies in increasing water use efficiency and attaining economical production of crops. Realizing the potential of SDI requires optimizing SDI design and management parameters : dripline spacing, dripline depth, emitter spacing, and irrigation treatment vis-a-vis soil type. As field studies require time and resources to install different SDI configurations, numerical modeling offers an alternative to assess the impact of SDI design configurations on soil-water distribution and transpiration. However, little work has been conducted to prove that numerical simulations can be used as SDI management and design tools. In this study, the computer software package Hydrus-2D was used to simulate transpiration and soil-water distribution from SDI in North Carolina. The objectives of this study were to 1) calibrate the Hydrus-2D model for its subsequent use in evaluating SDI design factors by comparing soil-water distribution results from Hydrus-2D simulations of corn grown on a coastal plain soil to measured soil-water data, and 2) use Hydrus-2D to simulate transpiration from corn under selected dripline depth, dripline spacing, soil type, flow rate, and irrigation treatment to identify designs that tend to maximize transpiration.

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Page publiée le 22 octobre 2016, mise à jour le 27 décembre 2017