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 17 of 17 for “"grid sampling"”.
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Wood and soil-atmosphere carbon dioxide fluxes from a tropical forest ecosystem
… at TNF using infrared gas analysis methods. Line sampling of soil CO2 fluxes made on randomly placed 30 meters transects averaged 4.7 +/- 0.2 mumol m -2 s-1 with higher rates during the wet season (4.9 +/- 0.3 mumol m-2 s-1) than during the dry season (4.4 +/- 0.2 mumol m-2 s-1). Fluxes were …
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The development and application of statistical sampling regime to map out hydrocarbons in sediments.
… investigates and develops a stratified random sampling design for sediments in an offshore oil field environment. The sampling area was partitioned equally into sixteen zones. Stratification was based on the near-field and far-field areas, and the number of samples in each zone was chosen by …
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The Accuracy of River Bed Sediment Samples
… surface layer. The traditional bulk or volume sampling procedure removes a specified volume of material from the stream bed. However, if the bed exhibits vertical stratification, the volume sample will mix different populations, resulting in inaccurate sample results. To obtain accurate results …
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Use of the fractal dimension in characterization of terrestrial surfaces
… respect to area and volume. Changes in scale and grid data resolution were simulated by decreasing the grid sampling interval of the DEMs in a systematic manner. The three DEMs examined were of a homogeneous character and were sampled on a 3 arc second latitude and longitude grid interval. The …
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Assessing Efficacy of Restoration Treatments in Juniper Savannas using Spatial Wavelets and Dot Grids on Aerial Photography
… utilizes and compares two techniques – dot- grid sampling and spatial wavelet analysis (SWA) – to estimate the efficacy of these treatments by measuring canopy-cover change pre-and post-treatment. Further, using the SWA dataset, the study explores the potential of SWA for landscape-scale …
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Assessing Efficacy of Restoration Treatments in Juniper Savannas using Spatial Wavelets and Dot Grids on Aerial Photography
… utilizes and compares two techniques – dot- grid sampling and spatial wavelet analysis (SWA) – to estimate the efficacy of these treatments by measuring canopy-cover change pre-and post-treatment. Further, using the SWA dataset, the study explores the potential of SWA for landscape-scale …
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Prescribed burning for vegetation management on the Blue Ridge Parkway
… were delineated in each unit for vegetation sampling. Four one-by-five meter plots were sampled on each transect for the species and number of root crowns in three height classes: less than one meter, one to three meters and greater than three meters. Vegetation sampling was completed before …
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The variability and geomorphology of Appling, Cecil, and Davidson soils on sideslopes in the Virginia Piedmont
… Cecil, and Davidson soils were sampled on a grid pattern (4 to 9 m spacings), using a bucket auger, to determine their modal character and variability with regard to various chemical and morphological parameters. Delineations were located on south-southwest facing, 5 to 12% slopes, in gently …
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An investigation of the influence of drought and other soil factors on the structure of a calcareous grassland.
… adopted; (1) analysis of spatial patterns by grid sampling of the field site. (2) comparative study of 17 component species in standardized environments. (3) synthesis of plant communities in turf microcosms simulating certain aspects of the Tongue End habitats. In the final chapter (Chapter …
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Sampling spatial sediment variation in gravel-bed streams
… research has largely dealt with the ability of grid, areal, and bulk sampling techniques to sample a single spot within a river. Little has been done in characterizing an entire river reach. Of the methods suggested, none is adequate because they are either inherently biased or are incapable of …
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Evaluation of Rotational Bale Grazing as an Alternative Winter-Hay Feeding System for Beef Cows
… 60 days. The study commenced with soil grid sampling across Novel Endophyte Tall Fescue (Schendonorous arundinaceous) pastures, strategically placing hay bales in areas with the lowest Mehlich 1- phosphorus (P). Changes in Mehlich 1-P, Mehlich 1-potassium (K), water-soluble P (WSP), …
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Mapping and mitigating soil total lead contamination in Chicago, Illinois
… Pb was quantified in Chicago soils obtained by grid sampling (n=995) parkways and residential properties (n=156). Due to anthropogenic modification of soils, total Pb concentrations may also correlate with other soil properties. In parkways, the mean concentration of Olsen P was 15.1 mg kg-1, …
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Mobile sensor systems for field estimation and "hot spot" identification
… two problems related to mobile sensor based sampling and signal estimation: nonuniform sampling and errors in sample location. Uniform grid sampling is often impractical in the context of mobile spatial sampling. As an alternative, I studied [delta]-dense sensor arrangements as a realistic …
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Energy based dissolution simulation using smoothed particle hydrodynamic sampling
… dissolution result is in- dependent of solute sampling resolution. A mathematical relationship is also established between the activation energy, the interfacial surface area, and the total dissolution time — allowing for intuitive artistic con- trol over the global dissolution rate. …
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Forest structure in unharvested old-growth: understanding the influence of soils on variability of long-term tree dynamics and fire history
… selected plots and included targeted site sampling of all heritage trees (≥80 cm diameter) on two unroaded, never-harvested mesas to examine the relationship between soil depth, stand basal area, and the presence of heritage trees. The development of forest canopies (which influence fire …
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The ecology of three sandy beaches on the West Coast of South Africa
… context. In the second chapter, methods of sampling sandy-beach macrofauna (in particular sampling strategies) are briefly reviewed and discussed. For this study it was decided to adopt a grid sampling strategy, and the value of this strategy was tested. In the third chapter the …
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Investigating peduncle colour evolution and chemistry during ripening in Vitis vinifera L. cv Shiraz
… from the same positions based on a regular grid sampling design for each patch of Shiraz; an enormous but fulfilling task! The within-patch variation among individual peduncle colour was found to be mostly driven by the berry maturation stages. It was found that at veraison, the peduncle …