Sökning: "River ice"

Visar resultat 1 - 5 av 33 uppsatser innehållade orden River ice.

  1. 1. Korttidsprognoser av Kalixälvens vattenflöde

    Kandidat-uppsats, Lunds universitet/Statistiska institutionen

    Författare :Mathilda Carlsson; [2023]
    Nyckelord :ARIMA; RecursiveAR; forgetting factor; sliding window; Kalman filter; short-term predictions; water flows; Mathematics and Statistics;

    Sammanfattning : The Kalix River, located in the northern part of Sweden, experiences a slowdown in water flow during cold winters. However, in spring, when snow and ice melt in the mountains, the water flow starts to increase. Towards the end of spring, there is usually a rapid and unpredictable surge in water flow known as the spring flood. LÄS MER

  3. 2. När bildas is? : En studie om ispredicering och faktorer som påverkar isbildning

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

    Författare :Dennis Berglund; [2023]
    Nyckelord :Frazil ice; temperature; ice-prediction; accumulated degree-days.;

    Sammanfattning : An improved knowledge regarding what spatial scale temperature data is needed for ice-prediction would improve calculations how ice-coverage has been affected over time. Which by extension would give insight how ice might response to climate change. LÄS MER

  4. 3. Restaureringens effekt på öringpopulationen

    Kandidat-uppsats, SLU/Dept. of Forest Ecology and Management

    Författare :Ola Carlström; Sebastian Dagman; [2022]
    Nyckelord :restaurering; flottning; öring; älv; bäck;

    Sammanfattning : Until the 1970s, rivers in Sweden were used for timber floating. In order for the floating to be as efficient as possible, with a minimum of timber getting stuck, many rivers were cleared. Large rocks and boulders were removed from the main channel and tributaries, backwaters and shallow areas were secluded. LÄS MER

  5. 4. Reviving Skellefteå

    Master-uppsats, KTH/Stadsbyggnad

    Författare :Lubna Boltakke; [2021]
    Nyckelord :Riverpark; Skellefteå; 2050; co-working; canal; water treatment; business park;

    Sammanfattning : The changes that we are seeing and anticipating are largely due to human behaviour. Arctic sea ice is at the lowest levels ever recorded. The volume of Arctic ice has decreased dramatically over the past decade. . LÄS MER

  7. 5. Identifying subarctic river thermal and mechanical ice break-up using seismic sensing

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

    Författare :Stefania Ursica; [2021]
    Nyckelord :Ice break-up; River ice; Subarctic; Thermal melting; Mechanical break-up; Freeze-up; Environmental seismology; Seismic signals;

    Sammanfattning : River-ice break-up in high-latitude regions, despite its brevity, is a fundamental process, representing the most dynamic and complex period of fluvial processes. Moreover, ice break-up has significant cascading ecological effects, with a different severity for mechanical vs. LÄS MER