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Vpliv rečne zapornice na Ambroževem trgu na temperaturne in kisikove razmere v Ljubljanici
Lebar, Klaudija (Author), Zabret, Katarina (Author), Vidmar, Andrej (Author), Sečnik, Matej (Author), Brilly, Mitja (Author)

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Abstract
Cilj projekta Ljubljanica povezuje je izboljšati življenjske razmere ogroženih ribjih vrst v reki. Ustrezne življenjske razmere so poleg povezanosti reke odvisne tudi od fizikalnih in kemijskih lastnosti vode (npr. temperatura in kisik), katerih vrednosti spremljamo s kontinuiranimi meritvami. Analizirali smo izmerjene vrednosti temperature vode in koncentracije raztopljenega kisika na merilnih mestih nad in pod zapornico na Ambroževem trgu. Za obdobje meritev med januarjem 2013 in julijem 2014 smo izračunali povprečne mesečne vrednosti obeh parametrov, določili njuno medsebojno odvisnost in odvisnost temperature vode od temperature zraka ter preverili vpliv zapornice na Ambroževem trgu na koncentracijo raztopljenega kisika v vodi pod zapornico. Ugotovili smo, da so povprečne mesečne vrednosti koncentracije raztopljenega kisika nad zapornico večji del obravnavanega obdobja nižje od koncentracij pod zapornico. Vzrok za razliko med koncentracijami pripisujemo turbulentnemu toku, za katerega je značilno učinkovitejše raztapljanje kisika v vodi. Med temperaturo vode in koncentracijo raztopljenega kisika je visoka negativna linearna korelacija, med temperaturo zraka in temperaturo vode pa visoka pozitivna linearna korelacija. Ugotavljamo tudi, da so na obravnavanih merilnih mestih kisikove in temperaturne razmere ugodne za ciljne ribje vrste projekta. Na 17 merilnih mestih vzdolž reke Ljubljanice bomo nadaljevali s kontinuiranimi meritvami parametrov vode, s katerimi bomo pridobili večji nabor podatkov.

Language:Slovenian
Keywords:Ljubljanica povezuje, raztopljeni kisik, temperatura vode, korelacija, vodostaj
Work type:Not categorized (r6)
Tipology:1.01 - Original Scientific Article
Organization:FGG - Faculty of Civil and Geodetic Engineering
Year:2014
Publisher:Univerza v Ljubljani, Fakulteta za gradbeništvo in geodezijo
Number of pages:Str. 85-102
Numbering:Letn. 27, št. 47
UDC:556.5:626.8(282)(497.4)
ISSN on article:1581-0267
COBISS.SI-ID:7377249 This link opens in a new window
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Downloads:669
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Record is a part of a journal

Title:Acta hydrotechnica
Shortened title:Acta hydrotech.
Publisher:Fakulteta za gradbeništvo in geodezijo
ISSN:1581-0267
COBISS.SI-ID:1838689 This link opens in a new window

Secondary language

Language:English
Title:Impact of the river gate on the Ambrož square on the temperature and oxygen conditions in the Ljubljanica river
Abstract:
The aim of the project Ljubljanica connects is to improve the habitat conditions of endangered fish species in the Ljubljanica River. Adequate living conditions in addition to river connectivity depend, among other things, on the physical and chemical characteristics of water (e.g. temperature, concentration of dissolved oxygen), which are monitored by continuous measurements. In this paper we analysed the measured parameters from two measuring stations, above and under the river gate on the Ambrož Square in Ljubljana. We analysed the data for water temperature and dissolved oxygen concentrations. For the measurement period between January 2013 and August 2014 we calculated the average monthly values of the two analysed parameters, calculated their interdependence and dependence of water temperature and air temperature. We verified the impact of the river gate on Ambrož Square on the concentration of dissolved oxygen under the gate. We found that the average monthly values of dissolved oxygen concentration above the gate are lower than concentrations under the gate for most of the analysed period. This shows the impact of turbulent flow under the gate. High negative linear correlation was observed between water temperature and dissolved oxygen concentration, while between air temperature and water temperature the linear correlation was highly positive. We note also that in the area of the gate, oxygen and temperature conditions are favourable for life of targeted fish species. With continuous measurements of water quality parameters at 17 monitoring sites along the Ljubljanica River we will be able to obtain a larger dataset.

Keywords:Ljubljanica connects, dissolved oxygen, water temperature, correlation, water level

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