Nitrate Nitrogen (NO3-N) Export Regimes Based on High-frequency Measurements in the Kuzlovec Stream Catchment
Režimi iznosov nitratnega dušika (NO3-N) na podlagi meritev s kratkim časovnim korakom na porečju vodotoka Kuzlovec
- Avtorji: Klaudija Sapač, Nejc Bezak, Andrej Vidmar, Simon Rusjan
- Citat: Acta hydrotechnica, vol. 34, no. 60, pp. 25-38, 2021. https://doi.org/10.15292/acta.hydro.2021.03
- Povzetek: V prispevku je predstavljena določitev režimov iznosa nitratnega dušika (NO3-N) s porečja vodotoka Kuzlovec med padavinskimi dogodki z različnimi metodami: razmerjem koeficientov variacije koncentracije NO3-N in pretoka (CVC/CVQ), naklonom premice skozi točke logaritmov pretoka in koncentracij (b), obeh omenjenih kazalnikov hkrati ter relativne spremembe koncentracije NO3-N med dogodkom (Crs). Količine NO3-N med padavinskimi dogodki namreč po predhodnih ocenah predstavljajo kar 30 % celotne iznesene količine NO3-N s porečja, časovno pa padavinski dogodki predstavljajo zgolj 10 % časa. Režime smo opredelili kot kemostatične (koncentracija se s pretokom ne spreminja) in kemodinamične (koncentracija se s pretokom spreminja), slednje pa dodatno še na režim spiranja in redčenja. V analizo je bilo vključenih 43 padavinskih dogodkov iz obdobja april 2018–april 2020, za katere smo razpolagali z 20-minutnimi podatki meritev koncentracije in pretoka. Vsi kazalniki so pokazali, da se porečje z vidika iznosa NO3-N glede na spremembo pretoka različno odzove in da je pretežen kemodinamični odziv s pogostejšo prisotnostjo spiranja. Morebitno povezanost raznolikosti režimov z obdobjem leta smo preverili z neparametričnim statističnim Wilcoxonovim testom. Za nobenega od kazalnikov nismo ugotovili statistično značilne razlike med sezonama, smo pa s podrobnejšo analizo kazalnika CVC/CVQ ugotovili, da je zelo verjetno povezan s sezonsko spremenljivostjo lastnosti padavin in posledično hidroloških razmer. V prihodnje bi bilo zato smiselno v raziskavo dodatno vključiti tudi spremenljivke, s katerimi opišemo lastnosti padavin in hidroloških razmer na porečju.
- Ključne besede: nitratni dušik (NO3-N), režim iznosa, razmerje koncentracija–pretok, Wilcoxonov test.
- Polno besedilo: a34ks.pdf
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