1111 KB50 KB199920252001Cepuder, PeterVeselič, MiranZupanc, Vesnaletnik:19številka:31str. 117-135ISSN:0352-3551COBISSID:3271801URN:URN:NBN:SI:doc-89Q5I4GZenslFakulteta za gradbeništvo in geodezijoActa hydrotechnicaagregatiamonijdifuzijakolonski poskusinitratpodtalnicaVpliv agregacije poroznega medija na prenos nitrata in amonija v zemeljskih kolonah| The influence of porous media aggregation on the nitrate and ammonium transport in soil columns|The displacement of one fluid by another miscible fluid under saturated conditions and at different average flow velocites in one - dimensional soil columns was studied. For the tracer solute, nitrogen fertilizer (combination of ammonium NH4+ and nitrate NO3- form of nitrogen) was used to observe the behaviour of the nitrogen in the transport processes. For the displacing fluid, distilled water was used. In the course of the experiments, conditions in soil columns with <2 mm soil fraction were altered. The size of the chosen aggregates influenced the behaviour of the tracer. Breakthrough curves of NO3- were compared to the NH4+ breakthrough curves symmetrical with all aggregate sizes. The BTC of the NH4+ obtained a clear shape with the larger aggregate sizes 0.63- 2 mm and 2-4 mm. The greatest influence on the NH4+ transport had the ability of the NH4+ to fixate on the negatively charged particle surfacesV enodimenzionalnih kolonah smo preučevali prenos tekočine z drugo mešajočo tekočino v nasičenih pogojih. Kot sledilo za opazovanje obnašanja dušika v procesih prenosa, smo uporabili dušično gnojilo (mešanica amonijske NH4+ in nitratne NO3- oblike dušika). Za premikajočo tekočino smo uporabili destilirano vodo. Med izvajanjem poskusov so se pogoji v kolonah, napolnjenih z medijem frakcije tal <2 mm spremenili. Izbrana velikost agregatnih delcev je imela vpliv na obnašanje sledila. Krivulje prehoda NO3- oblike so bile v primerjavi s krivuljami prehoda NH4+ simetrične oblike pri vseh velikostih agregatnih delcev. Krivulje prehoda NH4+ so dobile simetrično obliko pri večjih delcih od 0.63 do 2 mm in od 2 do 4 mm. Največji vpliv na prenos NH4+ je imela sposobnost fiksacije NH4+ na negativne površine delcevTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaUniverza v Ljubljani, Fakulteta za gradbeništvo in geodezijo