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 394 for “"spatial variability"”.
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Objectively identifying spatial variability in bankfull stage
… from high resolution LiDAR data at different spatial scales. The capability of this method is demonstrated on three different alluvial lowland meandering rivers to provide a range of scale and geomorphic and hydrologic conditions. Selection criteria are defined to maximize objectivity in …
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Spatial Variability in Seepage from Unlined, Open Channels
… of being a point measurement. Because spatial variability in seepage is often an important factor, a new model using the diffusion analogy to the shallow-water (Saint-Venant) equations was developed as a step toward estimating seepage losses from unlined channels.Comparison of numerical …
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Accounting for unpredictable spatial variability in plankton ecosystem models
Limitations on our ability to predict fine-scale spatial variability in plankton ecosystems can<br/>seriously compromise our ability to predict coarse-scale behaviour. Spatial variability which<br/>is deterministically unpredictable may distort parameter estimates when the ecosystem model<br/>is …
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SPATIAL VARIABILITY OF THERMAL PROPERTIES IN RECLAMATION COVER SYSTEMS
… methods do not provide any information as to the spatial variation of temperatures and thermal properties at scales other than the point scale. The objective of this study was to investigate the spatial scaling of thermal properties in reclamation cover systems. A distributed temperature sensing …
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Spatial Variability of Plant Nutrients in Two Illinois Fields
… have raised old questions concerning the spatial variability of soil supplied plant nutrients in fields. Two Illinois fields which have been soil sampled in a 25 meter grid for several previous years and having a known history were selected to determine the variability of soil pH, and …
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Quantifying and Mapping Spatial Variability in Simulated Forest Plots
Spatial analysis is of primary importance in forestry. Many factors that affect tree development have spatial components and can be sampled across geographic space. Some examples of spatially structured factors that affect tree growth include soil composition, water availability, and growing space. …
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SPATIAL VARIABILITY IN SPECIES COMPOSITION IN NEOTROPICAL MONTANE TREE COMMUNITIES
A plot network was used to look at changes in stand–level characteristics, diversity, and floristic composition across the elevational gradient and at tree line. Thirty –six 0.1–ha tree plots were installed (1) along three different elevational transects in tropical montane cloud …
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Predicting Spatial Variability of Soil Organic Carbon in Delmarva Bays
Agricultural productivity, ecosystem health, and wetland restoration rely on soil organic carbon (SOC) as vital for microbial activity and plant health. This study assessed: (1) accuracy of topographic-based non-linear models for predicting SOC; and (2) the effect of analytic strategies and soil …
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Spatial variability in modern brachiopod assemblages: paleoecological and geochemical implications
… time depends upon multi-scale analyses of spatial variation within narrow temporal intervals. This work investigates geochemical and paleoecological patterns in modern brachiopod faunas which may serve as analogues for ancient brachiopod assemblages. The paleoclimatic utility of delta18O in …
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Evaluating Spatial Variability of Precipitation in Kentucky with Exploratory Data Analysis
Spatial variability of precipitation is examined over the state of Kentucky and surrounding areas. The study focuses on the analysis of monthly precipitation totals from the period of 1961-2000. The purpose of the study is to develop a set of indices to represent the spatial variability of the …
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Temporal and Spatial Variability of Phytoplankton Biomass in Coastal Mississippi Waters
… Mississippi coastal waters to determine the spatial and temporal variability of phytoplankton. Nutrients (nitrate, silicate, phosphate), river discharge, temperature, salinity, stratification, tides, currents and winds were measured in concert with the phytoplankton concentrations. The …
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Spatial variability in washover deposits : Hurricane Ike and the Texas coast
Washover sand deposits are common depositional features caused by large storms that affect coastal areas. Hurricane Ike was a powerful storm that hit the gulf coast in September of 2008, the track of the eye crossing Bolivar Peninsula in Texas. The attempt was made to exhaustively identify and map …
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Spatial Variability of Metals and Organic Carbon In Salt Marsh Sediment
… to assess the metal contamination and ignore the spatial variability of sediment metal concentration. In this study, I conducted a high frequency sampling strategy to quantify the spatial variability of sediment metal concentration and characterize processes controlling it. 51 surface sediment …
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Spatial variability of peat subsidence in Southeast Asia by land use
Variograms are a valuable tool for geospatial analysis as they provide a description of how data are correlated as a function of separation distance. Their application can prove valuable for not only analyzing variations in environmental parameters such as peat subsidence in two dimensional space, …
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Effect of scale and spatial variability on surface foundation on sand
… aims to investigate the effect of scale and spatial variability on the bearing response of surface foundations on sand. Finite element analyses are performed using a generalized effective stress soil model, MIT-S, to investigate the scale effects in the foundation load response, under …
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Quantitative modelling of spatial variability in the north Atlantic spring phytoplankton bloom
The effects of variability in the physical environment on the development of the spring phytoplankton bloom are investigated using a physically forced model of the annual plankton cycle in the ocean mixed layer. The model is optimised to fit survey data from the eastern North Atlantic, collected …
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SPATIAL VARIABILITY IN FOREST FUELS: SIMULATION MODELING AND EFFECTS ON FIRE BEHAVIOR
… to represent wildland fuels, a three dimensional spatially explicit fuel model, FUEL3D, is presented which represents fuels at a level of detail comparable to what we can actually measure: stands as collections of individual trees, with branches and foliage. In conjunction with new, physical fire …
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SPATIAL VARIABILITY IN FOREST FUELS: SIMULATION MODELING AND EFFECTS ON FIRE BEHAVIOR
… to represent wildland fuels, a three dimensional spatially explicit fuel model, FUEL3D, is presented which represents fuels at a level of detail comparable to what we can actually measure: stands as collections of individual trees, with branches and foliage. In conjunction with new, physical fire …
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Soil Spatial Variability: Structures, Models, and Their Effects on Crop Yield Variability
… accounted for more than 80% of total soil variability. Component regression accounted for about 52%, and 39% of soybean and corn yields variability respectively. Particle size distribution and organic matter by influencing moisture and nutrient dynamics, were the most important factors …
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A three-dimensional analytical study of spatial variability of seismic ground motions
… stochastic method is developed to estimate the spatial variation of seismic ground motions which is necessary for the analysis and design of lifeline systems. An analytical model for wave propagating through a three-dimensional half-space is first proposed to evaluate the ground responses. The …
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