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 134 for “"spatial and temporal variability"”.
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Spatial and temporal variability in Acacia population dynamics
Variability in fire, herbivory, and climate facilitate the coexistence of trees and grasses in savannas and impact upon savanna structure, which also varies substantially both spatially and temporally. These features can shape savannas at an ecosystem and even at a global scale, but mechanisms for …
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Spatial and temporal variability in Acacia population dynamics
Variability in fire, herbivory, and climate facilitate the coexistence of trees and grasses in savannas and impact upon savanna structure, which also varies substantially both spatially and temporally. These features can shape savannas at an ecosystem and even at a global scale, but mechanisms for …
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Mechanisms Promoting Spatial and Temporal Variability in Plant Defense
… examines how environmental heterogeneity and succession influence the distribution, expression, and adaptive value of resistance and tolerance of goldenrod (Solidago altissima). Within replicate early- and late-successional fields, I quantified the spatial structure of herbivore damage and …
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Spatial and Temporal Variability of Subsidence: Fort Bend County, Texas
… new geodetic data revealing the evolution and magnitude of land subsidence in Fort Bend County (FBC) through 2014. Subsidence in the greater Houston metropolitan area has been monitored since 1926 and several generations of maps have portrayed more than three meters of subsidence. Recent …
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Long Term Ground Based Precipitation Data Analysis: Spatial and Temporal Variability
… seven climate divisions by using modeled and gauge (in-situ/ground) precipitation measurements and various climate indices. Three scientific studies were conducted as part of this research for evaluation of spatial and temporal ENSO events from modeled and gauge data using: 1) Wavelets 2) …
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Characterization of the spatial and temporal variability in pan-Arctic, terrestrial hydrology
… component of the larger global climate system, and there are signs that significant water-cycle changes, involving complex feedbacks, have occurred. This dissertation explores the methods to estimate components of the arctic hydrological cycle, the numerous biases and uncertainties associated …
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Spatial and temporal variability of carbon stocks within the River Colne Estuary
… aim of this study is therefore to better understand the spatial and temporal variation of saltmarsh sediment total organic carbon (TOC) content. Therefore, three saltmarshes along the salinity gradient of the Colne Estuary were studied. The effect of the study sites’ locations along the estuary, …
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Spatial and temporal variability of coastal temperature and salinity in Angolan waters
… the central Angolan region, in situ temperatrure and satellite derived SST and in situ salinity were used to describe both the SST and SSS fields off Angola during the period 1969-1999 with some gaps. Emphasis was placed upn the Lobito coastal oceanographic station (12° 19S 13° 34E) mean …
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Spatial and temporal variability of tide-induced salt flux in a partially mixed estuary
… with river discharge, fortnightly tidal forcing, and along channel variability are explored. Four river discharge conditions were considered: 1200 m3 s-1, 600 m3 s-1, 300 m3 s-1, 150 m3 s-1. Tide-induced residual salt flux was found to be variable along the channel, with locations of …
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Spatial and temporal variability of the soil saturated hydraulic conductivity in gradients of disturbance
As land-cover conversion continues to expand into ever more remote areas in the humid tropics, montane rainforests are increasingly threatened. In the south Ecuadorian Andes, they are not only subject to man-made disturbances but also to naturally occurring landslides. I was interested in the …
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Spatial and temporal variability of tide-induced salt flux in a partially mixed estuary
… with river discharge, fortnightly tidal forcing, and along channel variability are explored. Four river discharge conditions were considered: 1200 m3 s-1, 600 m3 s-1, 300 m3 s-1, 150 m3 s-1. Tide-induced residual salt flux was found to be variable along the channel, with locations of …
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Spatial and Temporal Variability of In-Stream Functioning within a Forested, Headwater Piedmont Watershed
… through denitrification to N2 gas. However, the temporal environmental factors controlling baseflow nitrogen retention are poorly understood, particularly temperature, shading, and dissolved organic matter dynamics. This study therefore attempts to elucidate the effects of these environmental …
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Spatial and Temporal variability of macroinvertyebrate communities in vernal pools on the Coastal Plain of Virginia
… typically are inundated beginning in the winter and then drying out completely in summer. Though evidence of spatial and temporal variability in the macroinvertebrate communities of vernal pools has been found in previous studies, it has not been studied extensively. The primary objective of this …
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Drivers of spatial and temporal variability in the fire regime of boreal forest in western Russia
Fire is an integral and major control on forest properties and ecosystem functions within the boreal forest. However, significant spatial and temporal variability in fire regimes occurs across this area that may not current be being encompassed in models and predictions of its future, particularly …
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The Decorrelation Length and Time Scale - Diagnostic Tools to Visualize Spatial and Temporal Variability in Geophysical Fields
Atmospheric reanalyses and model data are becoming more commonly used. However, most reanalyses and global climate models have resolutions of ~50 km or lower --- scales too coarse to capture many topographic and coastal effects within various geophysical fields such as precipitation and wind speed. …
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Spatial and Temporal Variability of Particulate and Chromophoric Dissolved Organic Matter Absorption in the Northern Gulf of Mexico
… by large freshwater inputs exhibit large variability in absorption and associated optical properties. Therefore, understanding coastal ecosystem processes requires intensive, ongoing sampling. Analysis of the Mississippi and Atchafalaya River plumes took place on board the RIV Pelican on …
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An Investigation of Spatial and Temporal Variability in Several of Montana's Reference Streams: Working Toward a More Holistic Management Strategy
… that fundamentally affects stream ecology and is considered an important water quality parameter from scientific and legal view points. On global, catchment and reach scales, anthropogenic activities have substantially altered natural stream temperature regimes, impairing these systems’ …
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An Investigation of Spatial and Temporal Variability in Several of Montana's Reference Streams: Working Toward a More Holistic Management Strategy
… that fundamentally affects stream ecology and is considered an important water quality parameter from scientific and legal view points. On global, catchment and reach scales, anthropogenic activities have substantially altered natural stream temperature regimes, impairing these systems’ …
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