Sökning: "Erosion Pit"

Visar resultat 1 - 5 av 7 uppsatser innehållade orden Erosion Pit.

  1. 1. Aspects of erosion of restored trout spawning beds in two streams in Northern Sweden

    Master-uppsats, SLU/Dept. of Wildlife, Fish and Environmental Studies

    Författare :Frida Michelle Granlund; [2021]
    Nyckelord :in-stream restoration; reproductive habitat; salmonids; passive integrated transponders tags PIT-tags ;

    Sammanfattning : Many rivers and streams in northern Sweden have been channelized due to timber floating. This has severely degraded the spawning habitats for salmon and trout, and therefore a common action when restoring channelized rivers is to establish new spawning beds by adding gravel to the streambed. LÄS MER

  3. 2. Physical microhabitat requirements for Margaritifera margaritifera and the influence of hydro- and morphodynamics on mussel bed stability

    Master-uppsats, Umeå universitet/Institutionen för ekologi, miljö och geovetenskap

    Författare :Tove Westberg; [2020]
    Nyckelord :Stream restoration; Freshwater pearl mussel; Microhabitat requirements; Sediment transport; Mussel translocation;

    Sammanfattning : Margaritifera margaritifera is an endangered freshwater pearl mussel with population declines throughout its Holarctic range. Boulder-bed channels with little input of fine sediment in previously channelized streams are abundant in Sweden. Hence, restoration efforts for M. LÄS MER

  4. 3. Fluid/Material Coupled Numerical Analysis of Single Bubble Collapse Near a Pit on a Wall

    Master-uppsats, KTH/Strömningsmekanik och Teknisk Akustik

    Författare :Daiki Makii; [2020]
    Nyckelord :Bubble Dynamics; Cavitation Erosion; Numerical Analysis; Fluid Material Coupled Numerical Method; Homogeneous Model; Elastic Body Material; Erosion Pit;

    Sammanfattning : In order to elucidate the progression mechanism of cavitation erosion, the behaviors of a single cavitation bubble collapse near a pit on a wall and both the resulting pressure wave in fluid and stress wave in material are investigated in detail. To find out the mechanism of cavitation erosion, many experimental studies on the bubble collapse behavior near a flat rigid wall and the resulting material damage have been conducted so far. LÄS MER

  5. 4. Utredning av erosionsnötning på material till bergborrningsverktyg

    M1-uppsats, Högskolan i Gävle/Maskinteknik

    Författare :Joona Loikkanen; Fredrik Hemgren; [2018]
    Nyckelord :;

    Sammanfattning : Sandvik Mining and Rock Technology (SMRT) är ett världsledande företag som tillverkar komplett utrustning till gruvindustrin. Några bergborrverktyg som utvecklas och tillverkas i Sandviken är bergborrkronor. Dessa kan delas in i tre produktgrupper, topphammar-, sänkborr- och rullborrkronor. LÄS MER

  7. 5. Predicting spawning bed erosion and longevity : a case study in tributaries to river Vindelälven, northern Sweden

    Master-uppsats, SLU/Dept. of Wildlife, Fish and Environmental Studies

    Författare :Viktor Tylstedt; [2013]
    Nyckelord :Salmo trutta; stream restoration; longevity; erosion; spawning bed; Vindelälven;

    Sammanfattning : Timber floating operations in Scandinavia during the 19th and 20th centuries has contributed to severe negative impacts on riverine ecosystems. Increase in water velocity and lack of stream bed heterogeneity as a result of stream channelization lead to increased bed load transport. LÄS MER