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University of Nevada, Las Vegas (2016)

Water Balance and Moisture Dynamics of an Arid and Semi- Arid Soil : A Weighing Lysimeter and Field Study

Koonce, Jeremy E.

Titre : Water Balance and Moisture Dynamics of an Arid and Semi- Arid Soil : A Weighing Lysimeter and Field Study

Auteur : Koonce, Jeremy E.

Université de soutenance : University of Nevada, Las Vegas

Grade : Doctor of Philosophy (PhD) 2016

Introduction
Semi-arid and arid environments are characterized by low precipitation and high evapotranspiration (ET), leaving little water available for discharge into surface water bodies and groundwater recharge. For these water-limited environments, understanding the relationships between precipitation, ET, and soil moisture is critical. These relationships not only affect water resources in these increasingly populated regions but are also necessary to predict the impact of climate change on semi-arid and arid ecosystems.
The overall goal of this dissertation was to shed light on the quantitative relationships between precipitation, evaporation, ET and soil moisture dynamics in an arid and a semi-arid environment. A three-step approach was chosen to (i) quantify soil water fluxes and storage of bare, arid soil in weighing lysimeters, (ii) evaluate a process-based evaporation model using evaporation data from the same bare, arid soil, and (iii) monitor the soil moisture and temperature dynamics of a vegetated, semi-arid soil at a field site. The studies were carried out at two sites in Nevada : (1) The bare arid soil is part of the SEPHAS weighing lysimeter facility, located in Boulder City near Las Vegas, southern NV ; (2) The vegetated semi-arid soil with a shallow water table (depth to water < 6 m) is located in Spring Valley near Ely, central Nevada.

Mots clés : Arid ; Evaporation ; Evapotranspiration ; Moisture ; Soils ; Vadose

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Page publiée le 6 octobre 2016, mise à jour le 16 juillet 2017