Sökning: "Lake"

Visar resultat 16 - 20 av 566 avhandlingar innehållade ordet Lake.

1. 16. Lake Hydrodynamics and Pollution Transport under Climate Change : The Case of Lake Victoria

   Författare :Seema Paul; Henrik Ernstson; Zahra Kalantari; Abhijit Mukherjee; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Bathymetry mapping; model verification; water balance; correlation; tracer transport; wind hydrodynamics; pollution and nutrient transport; climate effect; Mark- och vattenteknik; Land and Water Resources Engineering;

   Sammanfattning : A very small part of the total earth’s water is freshwater (only 2.5 %). Unfortunately, due to climate change and pervasive manmade activities, surface freshwater quality in many places of the world has become degraded. LÄS MER

3. 17. Studier över sörmländska sjönamn : Etymologi, namnbildning och formutveckling

   Författare :Svante Strandberg; Ortnamnsarkivet i Uppsala (OAU); []
   Nyckelord :HUMANIORA; HUMANITIES; Scandinavian languages; Swedish; lake names; river names; etymology; morphology; semantics; name formation; namnforskning; sjönamn; Namnforskning; Name Care and Name Planning; Place Names; Ortnamn;

   Sammanfattning : The study of Swedish lake names may involve difficulties of many different kinds. The varying themes of the individual studies making up this thesis reflect the wide span of hydronymic research. Lake names can be structured morphologically, semantically, chronologically and geographically. LÄS MER

4. 18. Gas Exchange over Aquatic Interfaces and its Importance for Greenhouse Gas Emission

   Författare :Jovana Kokic; Sebastian Sobek; Erik Sahlée; Marcus B. Wallin; Anne Ojala; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; gas exchange; lake; stream; lake sediment; headwaters; carbon dioxide; methane; greenhouse gas emission; carbon; turbulence; Biology with specialization in Limnology; Biologi med inriktning mot limnologi;

   Sammanfattning : Aquatic ecosystems play a substantial role in global cycling of carbon (C), despite covering only about 4% of the earth surface. They emit large amounts of greenhouse gases (GHG) to the atmosphere, comparable to the amount of C stored annually in terrestrial ecosystems. In addition, C can be buried in lake sediments. LÄS MER

5. 19. Lake sediment as environmental archive : natural and anthropogenic influence on the chronology of trace elements

   Författare :Evastina Grahn; Stefan Karlsson; Anders Düker; Bo Bergbäck; Örebro universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; lake sediment; environmental pollution; trace elements; chronology; diagenesis; Ag; Be; Ga; In; Pb; Sb; Tl; Environmental chemistry; Miljökemi; Enviromental Science; Miljövetenskap;

   Sammanfattning : The focus of this thesis is the historical pollution of some seldom-monitored trace elements (SMTEs; Ag, Be, Ga, In, Sb and Tl) that have been involuntarily released for several thousands of years but whose usage have increased during the industrial era. Sediment cores from four rural lakes in a south to north transect in central Sweden, and two urban lakes have been used as environmental archives for chronological studies. LÄS MER

7. 20. Hydrophysical processes governing brownification : A case study of Lake Bolmen, Sweden

   Författare :Clemens Klante; Avdelningen för Teknisk vattenresurslära; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Natural organic matter NOM ; Hydrodynamics; Lake; Hydrology; Drinking water production; Ecosystem;

   Sammanfattning : Access to water of good quality and quantity has become more challenging because of a changing climate, as well as an increase in the use of natural resources, which has lead to altered water chemistry. One of these changes is known as brownification, resulting from a higher organic matter content causing a yellow-brown color of surface waters. LÄS MER