Sökning: "vattendrag"

Visar resultat 1 - 5 av 70 avhandlingar innehållade ordet vattendrag.

  1. 1. Freshwater methane and carbon dioxide fluxes : Spatio-temporal variability and an integrated assessment of lake and stream emissions in a catchment

    Författare :Sivakiruthika Natchimuthu; David Bastviken; Åsa Danielsson; Peter A. Raymond; Linköpings universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Lakes; streams; spatio-temporal variability; CH4 flux; CO2 flux; gas transfer velocity; Sjöar; vattendrag; rumsliga och tidsmässiga variationer; CH4-flöden; CO2-flöden; gasutbyteshastighet;

    Sammanfattning : Freshwater bodies such as lakes and streams release the greenhouse gases methane (CH4) and carbon dioxide (CO2) into the atmosphere. Global freshwater CH4 and CO2 emissions have been estimated to be of a similar magnitude to the global land or ocean carbon sink, and are thus significant components of global carbon budgets. LÄS MER

  3. 2. Breaking the ice : effects of ice formation and winter floods on vegetation along streams

    Författare :Lovisa Lind; Christer Nilsson; Christine Weber; Michael Scott; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; anchor ice; climate change; in-stream; riparian; river ice; streams; vegetation;

    Sammanfattning : Streams in cold regions are characterized by unique hydrological processes that control flow regime and water levels. One of the most important processes is the formation, growth and melting of different types of ice in and around the stream channel during winter. LÄS MER

  4. 3. "Under pressure" : interaction between pharmaceuticals and river bacteria

    Författare :Aleksandra Hagberg; Madeleine Ramstedt; Mette Burmølle; Jerker Fick; Rikke Louise Meyer; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Biofilms; river bacteria; pharmaceutical contamination;

    Sammanfattning : Pharmaceuticals are often entering the environment without being completely decomposed. Once released in the environment they continue to carry on their main function but instead targeting the inhabitants of the aquatic ecosystem. Our interest was drawn towards the bacteria, that are often present in the environment in the form of biofilms. LÄS MER

  5. 4. Beräkningar av icke stationära flödesförlopp i reglerade vattendrag och dagvattensystem

    Författare :Anders Sjöberg; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : .... LÄS MER

  7. 5. Water Realities and Development Trajectories : Global and Local Agricultural Production Dynamics

    Författare :Mats Lannerstad; Jan Lundqvist; Malin Falkenmark; David Molden; Paul Appasamy; Linköpings universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Agriculture development; food production; per capita food supply; consumptive water use; evaporation; transpiration; hydro-climatic variability; blue water resource; green water resource; irrigation; river depletion; river basin closure; adaptive water management; vegetal and animal foods; Jordbruksutveckling; matproduktion; per capita mattillgång; konsumerande vattenanvändning; evaporation; transpiration; hydroklimatisk variabilitet; blåvattenresurs; grönvattenresurs; bevattning; uttorkning av vattendrag; överintecknade avrinningsområden; anpassad vattenhantering; vegetarisk och animalisk föda.; Water in nature and society; Vatten i natur och samhälle;

    Sammanfattning : Water constraints for humans and nature are gaining more and more public attention as a critical environmental dilemma that needs to be addressed. When aquifers and rivers are running dry, the debate refers to an ongoing “world water crisis”. LÄS MER