Numerical Study of Winter Diurnal Convection Over the City of Krasnoyarsk: Effects of Non-freezing River,Undulating Fog and Steam Devils     

M. Hrebtov  K. Hanjalić 《Boundary-Layer Meteorology》2017,163(3):469-495

We performed a numerical simulation of penetrative convection of an inversion-topped weakly stratified atmospheric boundary layer over urban terrain with a strong localized source of heat and moisture. With some simplifications, the case mimics the real environment of the Krasnoyarsk region in Russia where the non-freezing river Yenisei acts as a thermal and humidity source during winter, generating an undulating fog pattern along the river accompanied with scattered ‘steam devils’. An idealized full diurnal cycle was simulated using an unsteady Reynolds-averaged Navier–Stokes (RANS) three-equation algebraic flux model and the novel buoyancy-accounting functions for treating the ground boundary conditions. The results show a significant effect of the river on the net temperature and moisture distribution. The localized heat and moisture source leads to strong horizontal convection and marked non-uniformity of humidity concentration in the air. An interplay of several distinct large-scale vortex systems leads to a wavy pattern of moisture plumes over the river. The simulations deal with rare natural phenomena and show the capability of the RANS turbulence closure to capture the main features of flow and scalar fields on an affordable, relatively coarse, computational grid.  相似文献   

Forecasting hourly particulate matter concentrations based on the advanced multivariate methods     

M. Perišić  D. Maletić  S. S. Stojić  S. Rajšić  A. Stojić 《International Journal of Environmental Science and Technology》2017,14(5):1047-1054

In this study, several multivariate methods were used for forecasting hourly PM₁₀ concentrations at four locations based on SO₂ and meteorological data from the previous period. According to the results, boosted decision trees and multi-layer perceptrons yielded the best predictions. The forecasting performances were similar for all examined locations, despite the additional PM₁₀ spatio-temporal analysis showed that the sites were affected by different emission sources, topographic and microclimatic conditions. The best prediction of PM₁₀ concentrations was obtained for industrial sites, probably due to the simplicity and regularity of dominant pollutant emissions on a daily basis. Conversely, somewhat weaker forecast accuracy was achieved at urban canyon avenue, which can be attributed to the specific urban morphology and most diverse emission sources. In conclusion to this, the integration of advanced multivariate methods in air quality forecasting systems could enhance accuracy and provide the basis for efficient decision-making in environmental regulatory management.  相似文献   

Informing and public awareness on waste separation: a case study of the City of Niš (Serbia)     

V. Miltojević  I. Ilić Krstić  A. Petković 《International Journal of Environmental Science and Technology》2017,14(9):1853-1864

  相似文献   

Possibility for hydroenergetic utilization of relatively researched water streams     

Uroš M. Karadžić  Vuko V. Kovijanić  Radoje V. Vujadinović 《Water Resources》2014,41(6):774-781

Small mountain water streams are lately more interesting from the aspect of hydroenergetic exploitation. Catchments area of smaller rivers and creeks are mostly not enough researched from hydroenergetic aspect, so the most difficult task for small hydropower plant designers is to determine hydroenergetic potential of discussed water streams, from short period of hydrological observations. Very often happens that existing measurement stations on discussed water streams are placed few kilometers from potentially place of water intake and the value of flow is drastically different on these two locations. In this work, two methods for determination of hydrological picture for the chosen location of water intake on discussed river are shown, correlation method and analogy method. Using these methods it is possible to use data that describes measured values of discharge from the old measurement stations, that is exists on the same or adjacent river, to determine flow duration curve on the place of interests. Results given from these two methods are compared with measured values of discharge and precipitation from last period that are collected from location of planed intake. Based on the good agreement of theoretical and measured values, it was concluded that these two methods can be also applied to the adjacent basins. Suggestion of hydroenergetic utilization of discussed water stream and its economic justification is also presented in this work.  相似文献   

A kinematic model of vertical geomagnetic field variation resulting from a steady convective flow     

Alexandra Marsenić 《地球物理与天体物理流体动力学》2014,108(2):191-212

  相似文献   

Use of Mosses as Biomonitors of Major,Minor and Trace Element Deposition Around the Largest Thermal Power Plant in Serbia          下载免费PDF全文

Mirjana Ćujić  Snežana Dragović  Marko Sabovljević  Latinka Slavković‐Beškoski  Milan Kilibarda  Jelena Savović  Antonije Onjia 《洁净——土壤、空气、水》2014,42(1):5-11

  相似文献   

Rock-slides on road cuttings in the Dinaric karst of Croatia: processes and factors   总被引：1，自引：0，他引：1  

T. Roje-Bonacci  P. Miščević  D. Števanić 《Environmental Geology》2009,58(2):359-369

The northern Adriatic coast, which forms part of the Dinaric karst system, is bordered by high mountains. Here, the occurrence of rock-slides and rock-falls in road sections with high cuttings excavated in recent times and more than one century ago has been documented. Some of these old slopes were stable for a long time before rock-slides started to occur. We propose that these mass movements are favoured by karstification processes acting along joints in the exposed rock mass. The stress changes induced by overburden removal (excavation) cause dilation in the mass joint systems reducing the rock mass strength and facilitating the circulation of aggressive water. Changes in water pressure and temperature, wetting and drying cycles, and corrosion processes along discontinuity planes entail a reduction through time of the shear strength of potential failure surfaces.  相似文献   

Northern Adriatic phytoplankton response to short Po River discharge pulses during summer stratified conditions     

Damir Vilicic  Milivoj Kuzmic  Igor Tomažić  Zrinka Ljubešić  Sunčica Bosak  Robert Precali  Tamara Djakovac  Danijela Marić  Jelena Godrijan 《Marine Ecology》2013,34(4):451-466

A 275‐km‐long transversel Northern Adriatic profile from the mouth of the Po River (Italian Adriatic coast) to the Kvarner region (Croatian coastal island area) was investigated in three successive case studies in August 2008, 2009 and 2010. The short Po River pulses in August result in the surface advection of riverine water, nutrients and phytoplankton from the western to the eastern side of the Adriatic. This surface spreading exhibits inter‐annual variability depending on the riverine discharge in the preceding period. The Po River discharge pulse in August 2010 in particular resulted in an extraordinary tongue‐like advection of riverine water, nutrients, and phytoplankton towards the Eastern Adriatic coast. The phenomenon was detected using both satellite imagery and classical oceanographic measurements. In the advective water, toxic dinoflagellates were most abundant in August 2010, when the influence of the Po was greatest.  相似文献   

Statistical methods as indicator of offset printing wastewater quality     

Jelena S. Kiurski  Ivana B. Oros  Nebojsa M. Ralevic  Jasmina Stefanov 《Stochastic Environmental Research and Risk Assessment (SERRA)》2015,29(6):1709-1720

This study presents the application of different chemometric approaches on the dataset obtained during the monitoring of offset printing wastewater quality in Pozarevac, Serbia. Collecting of wastewaters was performed during a working week, five working days, in five offset printing facilities. Twenty five physico-chemical parameters were analyzed in wastewaters using the standard analytical and instrumental methods. The obtained dataset were subjected to cluster analysis and principal component analysis. Cluster analysis showed four groups of similarity between the printing facilities reflecting the different physico-chemical characteristics and pollution levels of studied wastewaters. Principal component analysis identified two principal components responsible for the data structure explaining 86 % of total variance of offset printing wastewaters. The obtained principal components indicate the parameters that are the most responsible for variation of offset printing wastewaters. This study clearly demonstrates the usefulness of chemometric methods in analysis of printing wastewater quality, identification of the main sources and understanding of spatial variations in wastewater quality. Also, it could be useful for the selection of an appropriate wastewater treatment plant.  相似文献   

Determination of Emerging Substances in the Danube and Potential Risk Evaluation          下载免费PDF全文

Nevena N. Grujić Letić  Maja Lj. Milanović  Nataša B. Milić  Mirjana B.Vojinović Miloradov  Jelena R. Radonić  Ivana J. Mihajlović  Maja M. Turk Sekulić 《洁净——土壤、空气、水》2015,43(5):731-738

  相似文献