Sökning: "pollutant transport"

Visar resultat 1 - 5 av 33 avhandlingar innehållade orden pollutant transport.

  1. 1. Waterborne sediment and pollutant transport into lakes and accumulation in lake sediments

    Detta är en avhandling från Stockholm : Institutionen för naturgeografi och kvartärgeologi

    Författare :Gull Olli; Stockholms universitet.; [2008]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Catchment; environmental projects; erosion; eutrophication; phosphorous transport and retention; soil transport; sediment accumulation; NATURAL SCIENCES Earth sciences Exogenous earth sciences Physical geography; NATURVETENSKAP Geovetenskap Exogen geovetenskap Naturgeografi; naturgeografi; Physical Geography;

    Sammanfattning : The general objective of this thesis is to contribute to the knowledge of the transport of sediments and pollutants from catchments to downstream water recipient systems and their accumulation in these systems, such as lakes and lake sediments. One part of the thesis studies the importance of drainage reach morphology and water flow for the phosphorous (P) transport and retention in the reaches, and the main controlling processes of the P retention in the reach sediments. LÄS MER

  2. 2. Numerical study on flow and pollutant dispersion inside street canyons

    Detta är en avhandling från Stockholm : KTH Royal Institute of Technology

    Författare :Yang Yunkai; KTH.; [2013]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Flow; Pollutant dispersion; CFD; Street canyon; Reliability; SRA - Energy; SRA - Energi;

    Sammanfattning : This thesis analyzes the characteristics of flow pattern and vehicle-emitted pollutant dispersion in roughness surface layer. In an urban environment, wind flow and transported-pollutant source interfere strongly with buildings and other roughness elements on the surface ground, which results in complex characteristics of flow pattern and pollutant dispersion in 3D circumstances. LÄS MER

  3. 3. Physical process effects on catchment-scale pollutant transport-attenuation, coastal loading and abatement efficiency

    Detta är en avhandling från Stockholm : KTH

    Författare :Georg Lindgren; KTH.; [2006]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Efficient pollutant load abatement; groundwater-surface water interactions; biogeochemical cycles; nitrogen; Lagrangian stochastic travel time approach; GIS; NATURAL SCIENCES Earth sciences Atmosphere and hydrosphere sciences Hydrology; NATURVETENSKAP Geovetenskap Atmosfärs- och hydrosfärsvetenskap Hydrologi;

    Sammanfattning : Pollutants follow various subsurface and surface water pathways from sources within a catchment to its outlet and may cause detrimental effects on downstream water quality and ecosystems. Along their different transport pathways through a catchment, pollutants may be attenuated subject to different physical and biogeochemical processes. LÄS MER

  4. 4. Watershed-based design of stormwater treatment facilities model development and applications

    Detta är en avhandling från Institutionen för anläggning och miljö

    Författare :Thomas Larm; KTH.; [2000]
    Nyckelord :watershed; stormwater; runoff; pollutant transport; design criteria; constructed wetland; wet pond; filter strip; swale; reduction efficiency; monitoring program; StormTac;

    Sammanfattning : .... LÄS MER

  5. 5. Long-term development, modeling and management of nutrient loading to inland and coastal waters

    Detta är en avhandling från Stockholm : Institutionen för naturgeografi och kvartärgeologi

    Författare :Amélie Darracq; Stockholms universitet.; Stockholms universitet.; [2007]
    Nyckelord :Physical Geography; geografi med naturgeografisk inriktning; Nutrients; catchments; environmental management; climate change; population and lifestyle development; subsurface-surface water interactions; long-term simulations; nutrient retention; modeling; hydrology; transport processes; biogeochemistry; scaling; transport and reaction rates; nutrients; climate chage;

    Sammanfattning : Environmental and water system protection and restoration require accurate knowledge and quantification of waterborne pollutant transport, retention-release and transformation processes taking place in the subsurface, river, lake and sea water systems, and at the interfaces between these systems. This thesis investigates the importance of spatial model resolution for such quantification and the possible long-term nutrient load development under different human perturbations and nutrient source management scenarios in the Swedish Norrström drainage basin, based on simulations with the GIS-based dynamic nutrient transport-attenuation model POLFLOW. LÄS MER