Hydropedology of Problematic Interfluve Transported Soils in the Central Virginia Piedmont
| Autor: | Severson, Erik D. |
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| Rok vydání: | 2016 |
| Předmět: | |
| Druh dokumentu: | Dissertation |
| Popis: | Interpreting soil wetness in upland transported soils on flat broad summits in the central Piedmont of Virginia containing chroma ≥ 3 redoximorphic features (RMFs) can be difficult. It is imperative to understand their saturation regimes because onsite wastewater disposal systems, which are sited based upon soil evaluations, have failed prematurely when installed into these problematic soils. My objectives were to determine if soil morphology was an accurate predictor of soil wetness and permeability, to differentiate interpretations for colluvial soils from residual soils, and to determine the effect of canopy cover on seasonal wetness. Soil morphology, soil wetness regimes in open and wooded canopies, and in-situ saturated hydraulic conductivity were documented in transported Appomattox, Bentley, Brockroad, Catharpin, and Dothan and residual Clifford, Minnieville, and Penhook soil series at eight sites. Transported soils had average winter water levels, and met 30-day and 20-day NRCS oxyaquic criteria at 81, 66, and 91 cm, respectively. Transported soils with depleted ped faces, Fe- concentrations, and chroma 3 depletions were saturated an average of 41, 23, and 41% of the winter, respectively. Residuum found ≥ 1.5 m beneath transported soils exhibited little saturation, thus confirming epiaquic conditions. Residual soils did not perch water for extended periods; and were saturated for significantly (p Ph. D. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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