Sökning: "Dammar"

Visar resultat 16 - 20 av 40 avhandlingar innehållade ordet Dammar.

1. 16. Characterisation of pollutants in stormwater treatment facilities

   Författare :Kristin Karlsson; Davis Butler; Luleå tekniska universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; VA-teknik; Urban Water Engineering;

   Sammanfattning : The overall objective of this thesis is to increase the knowledge of both the pollutants within stormwater treatment facilities and the maintenance of these facilities. This objective has been achieved by studying water and sediment with respect to metal concentrations, fractionation, and toxicity from ponds, sedimentation tanks, and gully pots with different catchment characteristics as well as from the sediment removal process. LÄS MER

3. 17. Analytical and numerical approaches to estimate peak shear strength of rock joints

   Författare :Francisco Ríos Bayona; Stefan Larsson; Fredrik Johansson; Diego Mas Ivars; José Muralha; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Rock joint; Shear strength; Failure criterion; Numerical shear tests; Bergsprickor; Skjuvhållfasthet; Brottkriterium; Numeriska skjuvförsök; Byggvetenskap; Civil and Architectural Engineering;

   Sammanfattning : In Sweden, there exists a large number of dams. Many of them are founded on rock masses normally affected by the presence of sub-horizontal rock fractures, which makes sliding along rock joints under the dam foundation one of the most critical failure mechanism. LÄS MER

4. 18. Terrestrial Si dynamics in the Arctic: a study on biotic and abiotic controls

   Författare :Hanna Alfredsson; Kvartärgeologi; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

   Sammanfattning : Silicon is the next most abundant element in the Earth’s crust and its biogeochemical cycle is linked with that of carbon. Further, silicon is a beneficial nutrient for plants in terrestrial ecosystems and a key nutrient for diatoms in aquatic ecosystems. LÄS MER

5. 19. Toward Realistic Failure Evaluations for Concrete Buttress Dams

   Författare :Jonas Enzell; Anders Ansell; Erik Nordström; Andreas Sjölander; Richard Malm; Leif Lia; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; concrete dams; buttress dams; stability analysis; dam failure behavior; physical model tests; FEM; betongdammar; lamelldammar; stabilitetsanalys; dammbrott; fysiska modellförsök; FEM; Betongbyggnad; Concrete Structures;

   Sammanfattning : Concrete dams, complex structures supporting massive loads, have traditionally been assessed using simplified 2D analytical stability analyses based on the rigid body assumption. Previous studies have shown that 3D behavior, such as the interaction between the monoliths and the valley's geology, can greatly impact the load-bearing capacity of gravity dams but remains largely unexplored in buttress dams. LÄS MER

7. 20. Sediment transport from source to sink in the Lake Baikal basin : Impacts of hydroclimatic change and mining

   Författare :Jan Pietroń; Jerker Jarsjö; Enrica Viparelli; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; sediment transport; human impact; hydroclimatic change; surface mining; metal-enriched sediment; Lake Baikal; the Selenga River; the Selenga Delta; Physical Geography; naturgeografi;

   Sammanfattning : Different magnitude, intensity and timing of precipitation can impact runoff, hillslope erosion and transport of sediment along river channels.  Human activities, such as dam construction and surface mining can also considerably influence transport of sediment and sediment-bound contaminants. LÄS MER