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 10 of 10 for “"Semivariograms"”.
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Geostatistical Structural Analysis: Exploring, Fitting and Testing Semivariograms
In conclusion, interactive tools and two alternative techniques (median polish with grid rotation and nonnested hypotheses tests) are available to researchers doing geostatistical structural analysis.
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Observation scale effects on fluid transport behavior of soil
… determined for log-transformed Ks and D from semivariograms. Monte Carlo simulations were used to predict field-average BTC's.
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Diameter Distributions of Juvenile Stands of Loblolly Pine (Pinus taeda L.) with Different Planting Densities
… in a particular stand were applied. Empirical semivariograms were derived for each plot over all ages to enable spatial trend recognition. Moran's I and Geary's C coefficients were estimated for ground-line diameters from ages 2 to 5, and for breast height diameters from ages 5 to 11. Though …
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Extraction of physically-realistic pore network properties from three-dimensional synchrotron microtomography images of unconsolidated porous media
… glass bead and natural sand systems. Finally, semivariograms and integral scale concepts were used as a tool to investigate the spatial correlation of the network. Results showed that microtomography is an effective tool to provide quantitative analysis of three-dimensional systems. The quality …
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Optimizing peak gust and maximum sustained wind speed estimates from mid-latitude wave cyclones
… research is needed to merge local-scale semivariograms with continental-scale models. Results showed substantial improvements in wind speed surface estimates over previous estimates and have major implications for catastrophe modeling companies, insurance needs, and construction …
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Ore Types And Fluid Regimes: Macassa Gold Mine, Kirkland Lake
… semivariogram models. However, experimental semivariograms calculated along three principal directions within the type zone: alone strike, across strike, and down dip; have zonal, directional and proportional effect anisotropies.;The (delta)('18)O and (delta)D of rocks and mineral separates …
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SPATIAL VARIABILITY OF THERMAL PROPERTIES IN RECLAMATION COVER SYSTEMS
… uniform through semivariogram analysis. Semivariograms at Site #2 displayed secondary structure that corresponded to the 65 m plateau and 35 m slope. Site #3 consisted of a uniform peat and a 2% slope. Spatial structure was non-existent at Site #3 and was attributed to the unique thermal …
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A comparison of spatial interpolation techniques in temperature estimation
… in this dissertation demonstrates how to fit semivariograms iteratively using an indicative goodness of fit (IGF) metric. Semivariogram fitting using an IGF is less subjective and more accurate than traditional fit-by-sight methods. Despite its mathematical elegance, kriging and cokriging did …
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Spatial variability of soil biological and chemical indicators in selected soils in South Africa
Understanding the spatial variability of selected soil fertility indicators could make it possible to optimize the use of agricultural inputs with the reduction of economic and environmental risks. The aim of this study was to determine the degree of spatial variability of soil fertility indicators …
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Spatial Variability Analysis and Reclamation of Saline-Sodic Soils in the Northern Great Plains
<p>Increased spring rainfall and higher temperatures when combined with changing landuses and extensive tile drainage installation have contributed to the development of sodic and saline/sodic soils in the Northern Great Plains. The objectives of this dissertation were: 1) determine the impact of …