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 144 for “"arid regions"”.
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A soil-vegetation-atmospere model for microclimatological research in arid regions
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric and Planetary Sciences, 1985.
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Environmental tracers in groundwater as tools to study hydrological questions in arid regions
… und SF6 verwendet um hydrologische Fragen in ariden Regionen zu studieren. Theoretische Modelle und numerische Methoden zur Behandlung des Phänomens von Luftüberschüssen in Grundwasser werden diskutiert. Das Potential dieser Ansätze zur Beschreibung des Phänomens der Entgasung, das in einigen …
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Geomorphic modeling and routing improvements for GIS-based watershed assessment in arid regions.
… their application to management problems in arid and semi-arid regions. The first is that the performance of event-based hydrologic models for ephemeral stream networks declines significantly as watershed size increases. The second is that no single model is capable of simulating runoff, …
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The role of rooting strategies on the eco-hydrology of semi-arid regions
Arid regions are characterized by high variability in the arrival of rainfall, and species found in these areas have adapted mechanisms to ensure the capture of this scarce resource. In particular, the rooting strategies employed by vegetation can be critical to their survival. However, land …
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Impacts of dust suppressant application in the quality of urban runoff in arid regions
The main objectives of this thesis were to generate preliminary data on the potential impacts of major categories of dust suppressants on the quality of urban runoff and to evaluate changes in the chemical composition of soils to which suppressants were applied. Eleven individual plots were …
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A multi-criteria evaluation of land-surface models and application to semi-arid regions
… To better understand SVATS performance in semi-arid regions, and to evaluate the various impacts of data on the parameter estimation problem, an intensive calibration and validation study is undertaken. Findings show that calibrated parameters result in improved performance over default, proxy …
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A mathematical model of browse and herbage production in communal grazing lands of semi-arid regions
… of growing cattle and grass production in a semi-arid rangeland.The existing model which is basically Dye's (1983) model in differential equation form handles: i) the growth and performance of cattle measured in terms of weight, ii) the initiation of grass growth in early rainy season and its …
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Ecological and Aesthetic Factors' Preferences of Urban Riparian Corridor in Arid Regions: A Visual Choice Experiment
… preferences for urban riparian corridors in arid regions, by testing to what extent people are willing to trade-off unmaintained ecological landscape for aesthetics offered by specific micro and macro environmental factors. Landscape design reflects ecological and aesthetic values, and …
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Assessing the salinity effects and economic feasibility of on-farm desalination technology in irrigated semi-arid regions
… can inhibit agricultural productivity. Semi-arid regions where irrigation is used to support crop growth are particularly impacted by the quality of surface and groundwater sources. In this study, we use a combined numerical modeling and economic analysis approach to estimate the regional …
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The Potential of Watershed Development for Enhancing Agricultural Livelihood: Three Essays from the Semi-arid Regions of India
… capacity of the, otherwise, rainfed agricultural regions. Irrigation capacity is built via the adoption of various soil and water conservation measures, which then facilitate recharge of groundwater tables within an identified micro-watershed (typically consisting of one or two village …
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The value of Mopane worms: quantifying ecosystem services in terms of nutrient cycling in semi-arid regions of Limpopo
Mopane worms are the late-instar stage caterpillars of the mopane moth, Imbrasia belina/ Gonimbrasia belina, found in southern Africa virtually following their hosts' trees, Colophospermum mopane, Terminalia seriscea, and Sclerocarya birrea, among others. The caterpillars are harvested for …
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Human-Plant Interactions in Semi-Arid Regions: An Archaeobotanical Study of the Iron Age Site of Mtanye, Southwestern Zimbabwe
… underpinned their ability to survive in a semi-arid environment for a prolonged time.
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Biosphere-atmosphere interactions over semi-arid regions : modeling the role of mineral aerosols and irrigation in the regional climate system
… role of land surface processes in shaping semi-arid climates, namely those of Southwest Asia and Northwest Africa. The interactions between dust emissions, irrigation, and climate processes are studied and quantified using a regional climate model to perform a series of carefully designed …
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Leveraging improved seed technology, migration and climate information for building the adaptive capacity and resilience to climate risks in semi-arid regions
… in the farming communities residing in semiarid lands. These include the use of adaptive seed technology, migration as a livelihood diversification and adaptive strategy, and the use of climate information in farm decision-making. The second chapter evaluates the impact of improved adaptive …
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The use of remote sensing and GIS for water resources management in large semi-arid regions: A case study of the Lake Chad Basin, Africa.
… management of the water resources in large semi-arid regions. In the Lake Chad Basin, Africa, it is demonstrated how remotely sensed data can contribute significantly to a groundwater problem, something which historically has not often been achieved, particularly in semi-arid areas.<br/><br/>In …
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CENÁRIO DA AGRICULTURA ORGÂNICA NO SEMIARIDO BRASILEIRO
… for organic production, especially in semi-arid regions, where information does not always reach producers. Thus, this paper aims to present a characterization of family and organic agriculture in the Brazilian Semi - arid, identifying among the units of the federation those that present a …
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Holocene vegetation and palaeoenvironments of the Southern Cederberg mountains of South Africa : palynological evidence from fossil hyrax (Procavia) dung middens
… are relatively easy to reconstruct in humid regions as polled traps (swamps and peat bogs) there are usually abundant. However arid and semi-arid regions (such as southern Africa) lack fossil pollen because of the scarcity of pollen preserving bodies. This attribute results in difficulties in …
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