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 19 of 19 for “"Agricultural irrigation"”.
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An analysis of water consumption rates in agricultural irrigation systems
… of the high water consumption rates found in irrigation systems which use projectile-type sprinkler heads, the history and evolution of irrigation systems is discussed. The effect of evaporation is studied as as explanation for the water losses, but it is found to be insignificant. Having …
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Characterization and remediation of toxic metals in wastewater reuse for agricultural irrigation
Expanding agricultural water demand has led to the reuse of wastewaters for irrigation purposes. Left untreated, these reused wastewaters may contaminate agricultural land, plants, and thereby food products. Common contaminants include toxic metals, which are conservative within the …
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Estimating the marginal value of agricultural irrigation water: A methodology and empirical application to the Berg River Catchment
… study develops an economic model of irrigated agricultural production that recognises the multi-output nature of irrigated agriculture as well as the institutional setting in which commercial irrigation water is allocated in South Africa. The model is then used to econometrically estimate the …
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Water reuse and conservation in the United States Virgin Islands
… in response to water scarcity for such things as irrigation and toilet flushing, but few practice water conservation. Unfortunately, the municipal wastewater treatment plants do not practice any form of reuse. Because of the need for reuse and conservation planning in the community, eight reuse …
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Computational design and optimization of infrastructure policy in water and agriculture
… the feasibility of seawater desalination for agricultural irrigation under different water costing schemes. Further, we use numerical simulations of partial differential equations to study the conflicting interests between agricultural and municipal water demands in groundwater aquifer …
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Assessing long-term conservation of groundwater resources in the Ogallala Aquifer Region using hydro-agronomic modeling
… is vital for domestic use, municipalities, agricultural irrigation, industrial processes, etc. Over the past century, excessive groundwater depletion has occurred globally and regionally, notably in arid and semi-arid regions, often due to providing irrigation water for crop cultivation. The …
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Geophysical, technical, and engineering feasibility assessment of solar-powered groundwater abstraction in rural areas of Greater Giyani Municipality, Limpopo
… access to energy and water that may be used for agricultural irrigation. Solar-powered irrigation for agriculture is a desirable use of renewable energy. However, for the system to be practical, it must be technically and economically feasible. This study assesses the geophysical, technical, and …
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The impact of global climate change on the runoff and ecological sustainability of the Breede River
… which demands the majority of river water for irrigation. The Department of Water Affairs and Forestry are currently investigating the future demand for water from the river, in this respect it is important to know what effect climate change will have on the change in river flow. Self …
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Advancing Forward Osmosis for Energy-efficient Wastewater Treatment towards Enhanced Water Reuse and Resource Recovery
… (DS), harvesting fresh water towards direct agricultural irrigation. However, using nutrient-rich fertilizers as DS resulted in an elevated reverse solute flux (RSF). This RSF, known as the cross-membrane diffusion of DS to the feed solution, led to deteriorated solute buildup on the feed …
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Location, location: Factors influencing greenhouse gas fluxes from the Mississippi Delta agricultural region
… (N2O), and carbon dioxide (CO2) fluxes from agricultural landscapes may contribute significantly to regional greenhouse gas budgets due to stimulation of soil microbial activity through fertilizer application. Few studies have made measurements of CH4, N2O, and CO2 from the dominant landscape …
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Water, Agriculture + settlement design in the arid lower Colorado River Basin : 3 new models
… of an increasingly unviable type of irrigated agricultural landscape, seen under the influences of three simultaneous processes: urban growth, change of cropping practice and return to the desert. Three new prototypical models are designed and tested: an urban-rural oasis, an adapted rural …
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Evaluation of irrigation water demand and agricultural land use in relation to surface water availability in Chongwe catchment.
… growth has been characterised by an increase in agricultural irrigation activities, competitiveness in water use which have caused water stress and conflicts in some catchments. Some water availability assessment works in Chongwe Catchment have been done by various researchers but very little …
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Evaluation of irrigation water demand and agricultural land use in relation to surface water availability in Chongwe catchment.
… growth has been characterised by an increase in agricultural irrigation activities, competitiveness in water use which have caused water stress and conflicts in some catchments. Some water availability assessment works in Chongwe Catchment have been done by various researchers but very little …
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Assessing climate and terrestrial water storage controls on evapotranspiration variability: towards improved understanding of watersheds as coupled nature-human systems
… represents the largest water consumption from agricultural sector. Although advances have been made in monitoring and simulating terrestrial ET in last decades, there are still challenges in reconciling and cross-validating ET observation and numerical model simulation results. In particular, …
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Thermodynamically-driven Advances in Efficient and Cost-Effective Desalination and Brine Concentration
… led to increased water demand for domestic use, agricultural irrigation, and industrial processes. The effects of climate change have resulted in changes to historical patterns of rainfall and water supply. Severe and lasting water shortages are becoming more common and widespread, so that …
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Efeitos do turno de rega, da densidade de plantio e da aplicação de fungicida no controle do mofo-branco na cultura do feijão
A pesquisa foi conduzida em Viçosa, MG, na Área Experimental "Aeroporto , pertencente ao Departamento de Fitotecnia da Universidade Federal de Viçosa, nos anos 2011 e 2012, cultivando-se feijoeiro comum (Phaseolus vulgaris L.), cultivar Madrepérola, na época de inverno, em quatro densidades de …
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Impact of climate variability and human activities on water resources.
… in water resources. Human activities, such as agricultural irrigation expansion and urbanization alter runoff regimes and have an impact on the availability of water resources. Significant LULC has occurred in southeastern Spain since the 1970s, as a result of the increasing abandonment of …
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Distribution and Transport of Nitrate in an Unconfined Alluvial Aquifer, Carson Valley, Douglas County, Nevada, 2009.
… alluvial aquifer for drinking water and agricultural irrigation (although the Carson River is also used for irrigation). Since the 1970's, there has been a rapid increase in population in several parts of the valley with little economic incentive for commercial builders to construct …
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Elaboration d’un modèle d’écobilan de l’exploitation agricole irriguée. Cas du périmètre du Tadla – Maroc
… waters quality and a soils salinization under irrigation. In the, studied zone of the present work, the lands irrigation started since several decades by using waters of sometimes very degraded mineral quality, on one hand, and the agricultural intensification essentially marked by the …