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1092. Reklama
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Language:
- Slovak
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
1093. Reklama
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Language:
- Slovak
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
1094. Reklama
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Language:
- Slovak
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
1095. Reklama
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Language:
- Slovak
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
1096. Reklama
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Language:
- Slovak
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
1097. Relation between phase density and component concentration in groundwater flow modelling
- Creator:
- Ondovčin, Tomáš and Mls, Jiří
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- groundwater flow, density-dependent flow, solution density, contaminant concentration, mathematical modelling, contaminant hydrogeology, proudění podzemní vody, hustotně závislé proudění, hustota roztoku, koncentrace kontaminantu, matematické modelování, and kontaminační hydrogeologie
- Language:
- Slovak
- Description:
- When investigating contaminant transport in groundwater aquifers, it is important to take into account the aqueous-phase density. In order to get the required information, the knowledge of functional relationship between the contaminant concentration and the aqueous-phase density is necessary. In this paper, the relationship was found for ten solutes commonly occurring in groundwater, namely CaCl2, KCl, K2CO3, K2SO4, KHSO4, Na2CO3, NaCl, Na2SO4, MgSO4 and MgCl2. Linear, parabolic and power functions have been applied and several quantities (mass fraction, molality, molarity, molar fraction, ionic strength and mass-volume concentration) have been considered in order to get the best accuracy of the obtained relationship. Finally, the problem of multicomponent solutions was solved. A new method of density determination was developed which makes use of known single-component relationships. The method was tested and its efficiency was verified and documented. and Při řešení problémů transportu kontaminantů v prostředí podzemní vody je důležité vzít v úvahu hustotu proudící fáze. K její znalosti je nezbytně nutná znalost závislosti hustoty fáze na koncentraci kontaminantu. Článek přináší potřebné funkční závislosti získané pro deset různých látek běžně se vyskytujících v prostředí podzemní vody, konkrétně pro CaCl2, KCl, K2CO3, K2SO4, KHSO4, Na2CO3, NaCl, Na2SO4, MgSO4 a MgCl2. Tři funkce, lineární, kvadratická a mocninná byly použity v kombinaci s různými veličinami (hmotnostní zlomek, molalita, molarita, molární zlomek, iontová síla a koncentrace) při hledání nejpřesnější formy výsledného vztahu. Problém byl následně řešen pro vícesložkové roztoky. Byla nalezena nová metoda využívající znalosti jednosložkových závislostí. Přesnost této metody byla v článku ověřena a dokumentována.
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
1098. Relation of influencing variables and weather conditions on rainfall partitioning by birch and pine trees
- Creator:
- Zabret, Katarina and Šraj, Mojca
- Format:
- počítač and online zdroj
- Type:
- model:article and TEXT
- Subject:
- throughfall, stemflow, rainfall interception, rainfall microstructure, boosted regression trees, and random forest
- Language:
- Slovak
- Description:
- General weather conditions may have a strong influence on the individual elements of the hydrological cycle, an important part of which is rainfall interception. The influence of general weather conditions on this process was analysed, evaluating separately the influence of various variables on throughfall, stemflow, and rainfall interception for a wet (2014), a dry (2015), and an average (2016) year. The analysed data were measured for the case of birch and pine trees at a study site in the city of Ljubljana, Slovenia. The relationship between the components of rainfall partitioning and the influential variables for the selected years was estimated using two statistical models, namely boosted regression trees and random forest. The results of both implemented models complemented each other well, as both indicated the rainfall amount and the number of raindrops as the most influential variables. During the wet year 2014 rainfall duration seems to play an important role, correlating with the previously observed influence of the variables during the wetter leafless period. Similarly, during the dry year 2015, rainfall intensity had a significant influence on rainfall partitioning by the birch tree, again corresponding to the influences observed during the drier leafed period.
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
1099. Relationships between soil water repellency and microbial community composition under different plant species in a Mediterranean semiarid forest
- Creator:
- Lozano, Elena, García-Orenes, Fuensanta, Bárcenas-Moreno, Gema, Jiménez-Pinilla, Patricia, Mataix-Solera, Jorge, Arcenegui, Victoria, Morugán-Coronado, Alicia, and Mataix-Beneyto, Jorge
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- soil hydrophobicity, phospholipids fatty acids, microbial community structure, biohydrology, actinobacteria, and glomalin related soil protein
- Language:
- Slovak
- Description:
- Soil water repellency (SWR) can influence many hydrological soil properties, including water infiltration, uneven moisture distribution or water retention. In the current study we investigated how variable SWR persistence in the field is related to the soil microbial community under different plant species (P. halepensis, Q. rotundifolia, C. albidus and R. officinalis) in a Mediterranean forest. The soil microbial community was determined through phospholipid fatty acids (PLFA). The relationships between microbiological community structure and the soil properties pH, Glomalin Related Soil Protein (GRSP) and soil organic matter (SOM) content were also studied. Different statistical analyses were used: Principal Component Analysis (PCA), ANOVA, Redundancy Analysis and Pearson correlations. The highest concentrations of PLFA were found in the most water repellent samples. PCA showed that microorganism composition was more dependent of the severity of SWR than the type of plant species. In the Redundancy Analysis, SWR was the only significant factor (p<0.05) to explain PLFA distributions. The only PLFA biomarkers directly related to SWR were associated with Actinobacteria (10Me16:0, 10Me17:0 and 10Me18:0). All the results suggest that a strong dependence between SWR and microbial community composition.
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
1100. Remote-sensing based groundwater recharge estimates in the Danube-Tisza sand plateau region of Hungary
- Creator:
- Szilágyi, József, Kovács, Ákos, and Józsa, János
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- groundwater recharge, MODIS data, Danube-Tisza sand plateau, doplňovanie podzemných vôd, MODIS, and plató Dunaj-Tisa
- Language:
- Slovak
- Description:
- Mean annual recharge in the Danube-Tisza sand plateau region of Hungary over the 2000-2008 period was estimated at a 1-km spatial resolution as the difference of mean annual precipitation (P) and evapotranspiration (ET). The ET rates were derived from linear transformations of the MODIS daytime land surface temperature (Ts) values with the help of ancillary atmospheric data (air temperature, humidity, and sunshine duration). The groundwater under the sand plateau receives about 75 ± 50 mm of recharge annually (the plus/minus value is the associated error, resulting from an assumed 5% error in both the P and ET values), which is about 14 ± 9 % of the regional mean annual P value of 550 mm. The largest continuous region with elevated recharge rates (about 180 ± 50 mm a-1 or 30 ± 8 % of P) occur in the south-western part of the plateau due to more abundant precipitation (around 580 mm a-1), while recharge is the smallest (about 40 ± 40 mm a-1 or 7 ± 7 % of P) under forested areas. Typically, lakes, wetlands, river valleys, and certain afforested areas in the north-central part of the region act as discharge areas for groundwater. and Priemerný ročný úhrn doplňovania podzemných vôd plošiny zloženej z pieskov medzi riekami Dunaj a Tisa s rozlíšením 1 km, pre roky 2000-2008 bol určený ako rozdiel medzi priemerným ročným úhrnom zrážok (P) a evapotranspiráciou (ET). ET bolo určené z lineárnej transformácie teploty povrchu počas dňa (Ts) získanej systémom MODIS pomocou údajov o vlastnostiach atmosféry (teplota vzduchu, vlhkosť vzduchu a trvanie slnečného svitu). Podzemná voda pod pieskovým masívom dostáva ročne asi 75 ± 50 mm vody (znamienka plus/mínus znamenajú chybu, vyplývajúcu z predpokladanej 5% chyby hodnôt P a ET), ktorá je asi 14 ± 9 % regionálnej priemernej ročnej hodnoty P, ktorá je 550 mm. Najväčšia spojitá oblasť so zvýšeným doplňovaním podzemnej vody (približne 180 ± 50 mm za rok alebo 30 ± 8 % P) sa nachádza v juhozápadnej časti plató a je dôsledkom vyššieho ročného úhrnu zrážok (okolo 580 mm), doplňovanie je nižšie v zalesnených oblastiach (okolo 40 ± 40 mm, alebo 7 ± 7 % P). Jazerá, mokrade, rieky a niektoré zalesnené oblasti v strednej a severnej časti tejto oblasti drénujú podzemné vody.
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public