Sökning: "catchments"

Visar resultat 21 - 25 av 163 uppsatser innehållade ordet catchments.

1. 21. Long-term phosphorus trends in Swedish rivers and streams : widespread and persistent nutrient decline

   Master-uppsats, SLU/Dept. of Aquatic Sciences and Assessment

   Författare :Sara Camiolo; [2021]
   Nyckelord :eutrophication; rivers; streams; phosphorus;

   Sammanfattning : Phosphorus (P) is often considered the limiting nutrient for freshwater productivity because of its relevant role in regulating algal production and determining community composition. The concern for increasing anthropogenic P inputs registered since the last century has shaped environmental policies around the world to limit the effects of algal bloom (also known as eutrophication) in freshwater ecosystems through the establishment of maximum threshold nutrient concentrations. LÄS MER

3. 22. Flood modelling in urban areas : A comparative study of MIKE 21 and SCALGO Live

   Master-uppsats, KTH/Hållbar utveckling, miljövetenskap och teknik

   Författare :Evelina Andersson; [2021]
   Nyckelord :SCALGO Live; MIKE 21; Stormwater Model; Flood Model; Cloudburst; Inundation; Comparative;

   Sammanfattning : Pluvial flooding originating from extreme rainfall is problematic and an increasing issue in Sweden. Higher requirements on adapting cities in urban areas to these challenges have been placed on both municipalities and the county administration. Thus, an increased need for water modelling, both in existing and planned areas have emerged. LÄS MER

4. 23. How design storms with normally distributed intensities customized from precipitation radar data in Sweden affect the modeled hydraulic response to extreme rainfalls

   Master-uppsats, Uppsala universitet/Luft-, vatten- och landskapslära

   Författare :Daniel Elfström; Max Stefansson; [2021]
   Nyckelord :cloudbursts; cloudburst mapping; spatial rain variation; pluvial flooding; hydraulic response; Swedish precipitation radar data; idealized urban catchment; hydrodynamic modeling; skyfall; skyfallskartering; gaussisk regnfördelning; spatial regnvariation; pluvial översvämning; hydraulisk respons; svensk nederbördsradardata; idealiserat urbant avrinningsområde; hydrodynamisk modellering;

   Sammanfattning : Intense but short-term cloudbursts may cause severe flooding in urban areas. Such short-term cloudbursts mostly are of convective character, where the rain intensity may vary considerably within relatively small areas. Using uniform design rains where maximum intensity is assumed over the whole catchment is common practice in Sweden, though. LÄS MER

5. 24. Temporal Trends in Dissolved Inorganic Carbon in a Swedish Boreal Catchment

   Master-uppsats, Uppsala universitet/Institutionen för geovetenskaper

   Författare :Lukas Rehn; [2021]
   Nyckelord :Boreal catchments; carbon cycling; carbon dioxide; DIC; headwater streams; Krycklan Catchment Study; trend analysis;

   Sammanfattning : Inland waters are important systems for transforming, storing and transporting carbon along the aquatic continuum, but also by emitting carbon dioxide (CO2) and methane (CH4) to the atmosphere. In light of the last decades observed increase in dissolved organic carbon (DOC) in many inland waters across the northern hemisphere, a logical question arise whether other aquatic carbon species display similar trends. LÄS MER

7. 25. A Nonlinear Reservoir Model to Simulate Blue-Green Stormwater Systems – An Application to Augustenborg Catchment in Malmö, Sweden

   Master-uppsats, Lunds universitet/Kemiteknik (CI)

   Författare :Emmanuel Ekwu; [2021]
   Nyckelord :Blue-green stormwater control; Nonlinear reservoir routing model; Stormwater; Modelling; Calibration; Water engineering; Technology and Engineering;

   Sammanfattning : The increasingly rapid urbanization has led to vast impervious surface areas in the urban environment. This situation of impervious surfaces has increased the surface temperature and interrupted the natural water circle, which has negatively impacted the urban environment. LÄS MER