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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Orsaker till allvarliga körskador vid överfarter i samband med slutavverkning / Causes of serious soil damage at crossings inconnection with final felling

Norin, Björn January 2021 (has links)
I samband med slutavverkning uppstår ibland körskador på skogsmarken. Stora Enso Skog har sedan flera år tillbaka problem med allvarliga körskador kopplat till överfarter vid slutavverkning. I den här studien identifierades och analyserades orsakerna till varför de allvarliga körskadorna uppkom vid överfarterna. Studien är en analys av trakter med betygsatta överfarter i Stora Ensos Skogs Grönt bokslut för 2019 och 2020 samt Egenkontroll och Traktdirektiv för trakterna som kompletterades med en fältinventering. Detta möjliggjorde att se samband och utfall mellan planering och avverkningslagens utförande samt faktorer till avvikelser. Studiens resultat visade på brister i hanteringen av överfarter hos både planeringen och avverkningslagen. Resultatet visade även att avverkningslagen anser att överfarterna är underkända i klart lägre utsträckning än Grönt bokslut. Slutsatsen är att de allvarliga körskadorna uppkommer på grund av en kombination av flera olika faktorer.
2

Karinių poligonų dirvožemio pažeidimų ir taršos tyrimai bei elektrokinetinio metodo taikymo galimybės / Research on soil disturbance and pollution with heavy metals in military grounds and potential of electrokinetic remediation application

Greičiūtė, Kristina 05 March 2007 (has links)
Military grounds are territories with specific purpose. Various kinds of military installations, ammunitions and explosives are used in such areas. Because of these reasons, soil in military grounds is very often polluted with heavy metals and oil products; because of continuous damages, made to the top soil, vegetation is very scarce, in some spots missing – sandy wastelands are formed. Explosions, performed in military grounds, can be characterized by both thermal and chemical effect (soil pollution with such compounds, like lead, zinc, copper etc). Not only soils in military grounds and surrounding areas can be polluted because of military activities, but surface water bodies and groundwater as well. Aiming on determination and estimation of the level of pollution and disturbance of superficial layer of soil in military grounds, it is essential to do comprehensive research on physical (explosions and other mechanical effects) and chemical (pollution with heavy metals) effects on soil, caused by militaryactivities, and to evaluate potential danger of pollutants spread and groundwater pollution. It is important to foreseen changes of soil damage and pollution depending on impact strength, type and intensity of military action, performed in specific area, and to evaluate pollution dispersion in deeper layers of soil, relying on investigation results and long-term prognosis. It is necessary to apply and elaborate effective methods for cleaning of polluted soils from military... [to full text]

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