Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 35 for “"critical zone"”.
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Valuing critical zone services in intensively managed landscapes
The critical zone (CZ) includes the range of biophysical processes occurring from the top of the vegetation canopy to the weathering zone below the groundwater table. CZ services provide a measure to value processes that support the goods and services from landscapes. In intensively managed …
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The influence of the Critical Zone on hillslope hydrology and stability
… canopy to unweathered bedrock, is known as the Critical Zone (CZ). It is essential for regulating the incidence of hydrological processes and hydro-geo hazards. Enhancing predictive models of infiltration, discharge production, and landslide initiation, requires an understanding of the …
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The bacterial ecology and function from a sub-surface critical zone
The rock-soil interface (critical zone) is where a variety of important earth system processes occur, such as the sequestration of CO2 and pedogenesis from rock weathering. This zone is an important sub-surface region of microbial activity in extreme environments because bedrock hydrolyses …
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Iron-Carbon Associations In Tropical Soils Of The Luquillo Critical Zone
… a range of spatial scales within the Luquillo Critical Zone Observatory (LCZO). Underlain by contrasting lithologies, the LCZO is characterized by highly-weathered, volcaniclastic Oxisols or quartz diorite-derived Inceptisols, producing an experimental gradient of iron content and speciation. …
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Illuminating controls on solute and water transport in the critical zone
… sustains nearly all terrestrial life, yet this critical zone is threatened by the environmental migration of new and potentially harmful compounds produced to support a growing human population. Traditional transport equations often fail to capture the environmental behavior of these emerging …
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Macro to Micro Legacies of Landuse at the Calhoun Critical Zone Observatory
<p>In this dissertation, human-critical zone (CZ) dynamics are explored at the Calhoun Critical Zone Observatory (CCZO). The 190km2 CCZO is part of a broader landscape in the southeastern US which was subjected to extensive agricultural degradation for approximately two hundred years before …
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Coupled dynamics of above- and below-ground interactions in the critical zone
… the processes and interactions that occur in the Critical Zone (CZ) is extremely important. It will help us to sustainably manage natural resources while maintaining a balance between the natural dynamics and anthropogenic modifications. In this study I have developed a predictive understanding of …
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A modeling framework for characterizing root exudation-driven geochemical dynamics in the Critical Zone
… Vegetation plays a central role in driving Critical Zone (CZ) hydrobiogeochemistry through root exudation, the process by which plant roots respond to their environment and release reactive carbon (C) into the soil to influence soil microbial symbionts to their advantage. Although previous …
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Roots as agents of soil change over time and as mediators of humanity’s imprint on Earth’s critical zone
… extensive anthropogenic legacies at the Calhoun Critical Zone Observatory. There, I found that even after 80 years of forest regrowth, rooting systems developing after intense ecosystem disturbance remained truncated and thus reliant on shallow, organically-bound nutrient stocks, in contrast to …
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Critical zone (bio)geochemical reactivity and hydrologic transport recorded by the stable lithium isotope ratios of fluids draining upland watersheds
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2025-08-01
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Temporal Dynamics of Groundwater Flow Direction in a Glaciated, Headwater Catchment
Shallow groundwater flow in the critical zone of steep headwater mountain catchments is often assumed to mimic surface topography. However, groundwater flow is influenced by other variables, such as the elevation of the water table and subsurface hydraulic conductivity, which can result in temporal …
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EVALUATION OF BEDROCK DEPTH AND SOIL INFILTRATION ALONG PENNYPACK CREEK USING ELECTRICAL RESISTIVITY TOMOGRAPHY AND MOISTURE LOGGERS
… urban areas to ultimately access their impact on critical zone modeling. ERT was also used to validate or dispute recent seismic interpretations. Four study sites adjacent to Pennypack Creek were selected based on variations in underlying geology: Triassic basin sedimentary rock (Lukens), …
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Development of a wireless sensor unit for tunnel monitoring
… to measure vertical displacements along the critical zone near Highbury & Islington station. A geomechanical analysis, provided by a third party, is used to establish the allowable maximum displacement. A custom wireless sensor module was developed from off-the-shelf components. This module …
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Modeling and measurement of tile drain controls in intensively managed landscapes
… fields. Since a tile drain reduces vadose zone soil moisture by lowering the water table, and its outlets feed directly into streams and ditches, tile flow can affect various hydrologic, biotic and biogeochemical processes in the watershed the streams. However, the effects of spatially …
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Carbon Cycling Dynamics Inferred from Carbon Isotope Sourcing in a Mid-Latitude Karst-Influenced River
… the quantification of global carbon flux in the critical zone.</p>
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Developing a framework for the design of the milling and rougher circuits for a platinum-bearing UG2 ore
… The UG2 reef is a chromitite layer in the critical zone of the Bushveld Igneous Complex, which results in high chromite content. Chromite causes significant complications in the downstream smelter process, and therefore chromite constraints are imposed on UG2 concentrators. A further aspect …
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Groundwater-surface water exchange within montane and alpine regions of the Front Range and Rocky Mountains, Colorado
… the Gordon Gulch catchment in the Boulder Creek Critical Zone Observatory. These tracer tests were paired with time-lapse electrical resistivity and modeled using OTIS to examine how solute transport and storage changed with decreasing stream discharge.
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Epikarst control on flow and storage at James Cave, VA: an analog for water resource characterization in Shenandoah Valley karst
… and weathered bedrock above karst aquifers, is a critical zone as it regulates the quantity and quality of recharge to the aquifer. As the epikarst exhibits complex heterogeneity, characterization at the field scale can be challenging. The objective of this thesis was to develop a model of …
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Analysis of Hydrologic and Geochemical Time Series Data at James Cave, Virginia: Implications for Epikarst Influence on Recharge
… to rapid groundwater transit in the transmission zone (KWI 2006). The epikarst, also known as the subcutaneous zone, is an interface between the soil overburden and the transmission zone. The epikarst is considered a critical zone as it can control hydrologic and geochemical characteristics of …
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M.I.celium mexicanus: Rejecting Modernity through Zapotec Futurism
… transforming their relationship to the Earth’s critical zone through reconciliation with mushrooms to cultivate fungal allyship. The thesis examines and reimagines a future of building that drives towards the biological vs. that which is mineralized and controlled through unempathetic forces …
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