Search for dissertations about: "Water cycle"

Showing result 1 - 5 of 294 swedish dissertations containing the words Water cycle.

  1. 1. Global and continental perspectives on the sustainability of future agricultural water management

    University dissertation from Stockholm : Stockholm University

    Author : Luigi Piemontese; Stockholms universitet.; [2019]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; water; sustainable water management; agriculture; water harvesting; climate change; vetenskap om hållbar utveckling; Sustainability Science;

    Abstract : Ensuring water and food security in the Anthropocene requires an understanding of combined climate change patterns and land and water management options from local to global scale. In many regions, irrigation from river and groundwater sources is being used at unsustainable rates and climate change will further threaten those water sources. READ MORE

  2. 2. Heat and water flows in freezing and thawing soils numerical modelling, laboratory and field observations

    University dissertation from Luleå : Luleå tekniska universitet

    Author : Helén Engelmark; [1993]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Vattenteknik; Water Resources Engineering;

    Abstract : A laboratory study of infiltration rates into frozen and unfrozen fine sand, including temperature effects of both soil and infiltration water, is reported. The average infiltration rate varied from about 10.6 mm/min for unfrozen conditions, to about 1-2 mm/min for frozen conditions. READ MORE

  3. 3. Advanced power cycles with mixture as the working fluid

    University dissertation from Stockholm : Kemiteknik

    Author : Maria Jonsson; KTH.; [2003]
    Keywords : power cycle; mixture working fluid; Kalina cycle; ammonia-water mixture; reciprocating internal combustion engine; bottoming cycle; gas turbine; evaporative gas turbine; air-water mixture; exergy;

    Abstract : The world demand for electrical power increasescontinuously, requiring efficient and low-cost methods forpower generation. This thesis investigates two advanced powercycles with mixtures as the working fluid: the Kalina cycle,alternatively called the ammonia-water cycle, and theevaporative gas turbine cycle. READ MORE

  4. 4. Changes of evapotranspiration and water cycle in China during the past decades

    University dissertation from Stockholm : Kemiteknik

    Author : Ge Gao; Göteborgs universitet.; Gothenburg University.; [2010]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Potential evapotranspiration; Actual evapotranspiration; Spatial and temporal characteristic; Trend; Controlling factors; Water cycle; Thornthwaite water balance; China;

    Abstract : Evapotranspiration is the second largest quantity in the water cycle and an important indicator for climate changes. Accurate estimations and better understanding of evapotranspiration are required in hydrologic studies and water resources modelling under stationary and changing climate conditions. READ MORE

  5. 5. Fresh Perspectives on the Assessment of Sewage Sludge Management

    University dissertation from Stockholm : Kemiteknik

    Author : Robin Harder; [2015]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; life cycle assessment; biosolids; land application; sewage sludge; pathogen risk; risk assessment; life cycle impact assessment; human toxicity; wastewater; chemical risks;

    Abstract : Sewage sludge management and its role in closing nutrient cycles have received considerable attention in recent years. This thesis quantified phosphorus flows in Gothenburg, Sweden, under current and possible future waste management practices, and aimed to improve the assessment of wastewater and sludge management from an environmental and human health perspective through blending risk assessment (RA) and life cycle assessment (LCA). READ MORE