Global ETD Search
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Showing 1 to 8 of 8 for “"Critical Zone Observatory"”.
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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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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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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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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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Influence of topographic stress on rock fracture : a two-dimensional numerical model for arbitrary surface topography and comparisons with borehole observations
… altimetry map of the Susquehanna/Shale Hills Critical Zone Observatory in central Pennsylvania, the model predicts considerable differences in depth profiles of stresses beneath ridgelines and valley floors. Using a representative value for the friction angle of shale, we calculate the minimum …
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Ground-penetrating radar images of a dye tracer test within the unsaturated zone at the Susquehanna-Shale Hills CZO
… flow paths in the shallow, unsaturated zone on hillslopes in two adjacent watersheds within the Susquehanna-Shale Hills Critical Zone Observatory (CZO). At each site we injected about 50 L of water mixed with brilliant blue dye (4 g/L) into a trench cut perpendicular to the slope (~1.0 m …
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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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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 …