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Wyświetlanie 1-15 z 89
Tytuł:
Fluvial processes as a reflection of river sediment transport. Examples from Russia
Autorzy:
Chalov, Roman S.
Powiązania:
https://bibliotekanauki.pl/articles/634169.pdf
Data publikacji:
2011
Wydawca:
Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Opis:
Sediment transport is one of the main elements of fluvial processes; and with it fluvial processes themselves are elements of sediment supply into rivers. The amount of sediment transported by a stream is determined by its carrying capacity, which changes in line with spatial and temporal changes in stream hydraulic characteristics. Correlations between them set the conditions for vertical channel deformation. When a riverbed is composed of heavy material, stream carrying capacity is realized due to horizontal channel deformations. The complexity of correlations between fluvial processes and sediment transport is determined by the transport of the latter in suspended and bed load forms, permanent conversions from one form to another in line with changes in stream hydraulic characteristics along and across the river channel, from the high-water to the low-water period versus the water flow in river branches. Sediment load itself and its magnitude determine the development of channel relief forms and the transformation of straight channels to meandering or braided channels. The main role in channel development is played by bed load flow. The ratio of bed load to suspended load determines changes in morphometric channel characteristics and its stability as well as effects the development of channel meanders and river bifurcations. At the same time, it is important to take into account the proportion of suspended and bed load components and their proportion in channel-forming sediment.
Źródło:
Prace Geograficzne; 2011, 127
1644-3586
Pojawia się w:
Prace Geograficzne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of overlying water pH, dissolved oxygen and temperature on heavy metal release from river sediments under laboratory conditions
Autorzy:
Huang, Y.
Zhang, D.
Xu, Z.
Yuan, S.
Li, Y.
Wang, L.
Powiązania:
https://bibliotekanauki.pl/articles/204852.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
heavy metal
release
river sediment
Opis:
The heavy metal release experiments were conducted in the laboratory to examine the effects of 3 factors - pH, dissolved oxygen (DO), and temperature on the metal release from sediments taken from the Huangpu River. The metal concentrations in the dry sediments ranged from 0.030 to 0.296 mg g-1 for Cr, 0.021 to 0.097 mg g-1 for Ni, 0.014 to 0.219 mg g-1 for Cu, 0.035 mg to 0.521 mg g-1 for Zn, 0.0002 to 0.001 mg g-1 for Cd and 0.023 to 0.089 mg g-1 for Pb. Most of the metals found in the sediments were in the form of residual fraction, the exchangeable fraction consisted of only a small portion of total metals. The average dissolved metal concentrations in the overlying water during the 13-day period under different conditions were ranging from 0.82 to 1.93 μg L-1 for Cr, 1.08 to 4.19 μg L-1 for Ni, 40.79 to 82.28 μg L-1 for Cu, 20.30 to 29.96 μg L-1 for Zn, 1.57 to 4.07 μg L-1 for Cd, and 22.26 to 75.50 μg L-1 for Pb, respectively. Statistical interpretation of the data indicated that pH (7, 8, 9), dissolved oxygen DO (1.0 and 5.0 mg L-1) and temperature (4, 16, 25°C) had no significant effects on the heavy metal release under the studied conditions. Cu and Pb had the highest release flux, while Cd, Pb and Cu had higher mobility. The main factors controlling the metals release might be the inherent characters of metals and sediments.
Źródło:
Archives of Environmental Protection; 2017, 43, 2; 28-36
2083-4772
2083-4810
Pojawia się w:
Archives of Environmental Protection
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determining water and sediment quality related to lead-zinc mining activity
Autorzy:
Yucel, D. S.
Baba, A.
Powiązania:
https://bibliotekanauki.pl/articles/205465.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
metal contamination
Pb-Zn mining
river sediment
Umurbey dam basin
water resources
water quality
Opis:
This study focuses on the Koru and Tesbihdere Pb-Zn mining districts, located at the upstream areas of the Umurbey dam basin. Mining activities in Koru, one of the longest operated mines in NW Turkey, date back to the beginning of the 1900s. The purpose of the study is to (1) determine the hydrochemical properties of the water resources and to assess the potential environmental consequences of mining activities in the Koru and Tesbihdere mining districts, and (2) investigate the effects caused by mining activities on the water resources and sediment quality in the Umurbey dam basin. Concentrations of As, Cd, Cu, Fe, Mn, Pb, and Zn in river sediments downstream of the Tesbihdere and Koru mining district, and in the Umurbey dam sediments were higher than the world average for river sediments. The geoaccumulation index and enrichment factor revealed that sediments were strongly polluted with Pb and Zn, moderately to strongly polluted with Cd and moderately polluted with Cu. The chemical analyses of water resources revealed that the maximum Fe, Zn, Pb, Mn, and Cu concentrations reached 2890 μg/l, 1785 μg/l, 1180 μg/l, 984 μg/l, and 419 μg/l, respectively. The Koru River is classified as polluted water according to Turkish inland water quality regulations. The environmental contamination problems in the local drainage system are caused by leakage from past and current tailing ponds into the Koru River.
Źródło:
Archives of Environmental Protection; 2018, 44, 3; 19-30
2083-4772
2083-4810
Pojawia się w:
Archives of Environmental Protection
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A comparative study of artificial intelligence models for predicting monthly river suspended sediment load
Autorzy:
Rezaei, Khalil
Vadiati, Meysam
Powiązania:
https://bibliotekanauki.pl/articles/292569.pdf
Data publikacji:
2020
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
artificial intelligence
data-driven methods
Karaj dam
suspended sediment load
the Karaj River
Opis:
When high precision modelling is required, for example, with the estimation of suspended sediment load (SSL), data-driven models are preferred over physically-based numerical models for their real-time, short-horizon prediction ability. The investigation of SSL, as an important index in engineering practices assessment, like design and operation of the hydraulic structures not only shows the hydrological behaviour of the river, but also illustrates the valuable information about the water quality deterioration, surface-groundwater interaction and land-use changes of the watershed. The following data-driven methods were compared in order to predict SSL at the Seyra gauging station on the Karaj River in Iran: Fuzzy logic (FL), two adaptive neuro-fuzzy inference systems (i.e., ANFIS-GP and ANFIS-FCM models), an artificial neural network (ANN), and least squares support vector machine (LSSVM). Monthly average river flow and SSL data for 50 years were obtained from the Tehran Regional Water Authority (TRWA). The data was first divided into training, validation and test sets and the SSL was then predicted using the ANN, FL, ANFIS, and LSSVM models. The reliability of the applied models was evaluated by the correlation coefficient (R), root mean square error (RMSE), and mean absolute error (MAE). The results showed that the ANFIS models outperformed the ANN, FL, and LSSVM models for predicting SSL using the given input and output data. Overall, the performances of the artificial intelligence models used in the present study were satisfactory in predicting the non-linear behaviour of the SSL.
Źródło:
Journal of Water and Land Development; 2020, 45; 107-118
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Performance Comparison of Various Artificial Intelligence Approaches for Estimation of Sediment of River Systems
Autorzy:
Hayder, Gasim
Solihin, Mahmud Iwan
Kushiar, Khairul Faizal Bin
Powiązania:
https://bibliotekanauki.pl/articles/1955428.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
sediment estimation
artificial intelligence
machine learning prediction
river system
visual programming
hydro-informatics system
Opis:
Sediment is a universal issue that is generated in the river catchment and affects the river flow, reservoir capacity, hydropower generation and dam structure. This paper aims to present the result of experimentation in sediment load estimation using various machine learning algorithms as a powerful AI approach. The data was collected from eight locations in upstream area of Ringlet reservoir catchment. The input variables are discharge and suspended solid. It was found that there is strong correlation between sediment and suspended solid with correlation coefficient of R = 0.9 . The developed ML model successfully estimated the sediment load with competitive results from ANN, Decision Tree, AdaBoost and SVM. The best result was produced by SVM (v-SVM version) where very low RMSE was generated for both training and testing dataset despite its more complicated hyperparameters setup. The results also show a promising application of machine learning for future prediction in hydro-informatic systems.
Źródło:
Journal of Ecological Engineering; 2021, 22, 7; 20-27
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Water Quality Examination in the Stream Sediment of River Sitnica – the Assessment of Toxic Trace Elements
Autorzy:
Troni, Naser
Hoti, Ramiz
Halili, Jeton
Omanovic, Dario
Laha, Fisnik
Gashi, Fatbardh
Powiązania:
https://bibliotekanauki.pl/articles/1839079.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
Sitnica river
river water
stream sediment
quality assessment
inductively coupled plasma
mass spectroscopy
Opis:
It is presently well-recognized that the contamination of aquatic sediments in Kosovo is a widespread phenomenon. The observation of the chemical analyses of water and sediments is essential to determine the extent of trace elements in these ecosystems. Hence, in order to be able to determine the mass concentration of the predominant elements present in river Sitnica, inductively coupled plasma mass spectroscopy (ICP-MS) was used for this research. Moreover, a comparison of the mass concentration of water elements with the mass concentration of the elements found in the Sitnica sediments was provided. Utilizing the results obtained from the ICP-MS analysis, it was shown that the mass concentration of nickel, arsenic, zinc, cadmium, lead, copper, aluminum in certain water sample stations exceeds the permissible sediment quality criteria. Considering the toxicity that heavy metals exert on the aquatic environment, this research aimed to assess and measure the metal toxicity, because only then, a proper solution can be suggested to sustain freshwater ecosystems and to prevent constant damage from the human activity.
Źródło:
Journal of Ecological Engineering; 2021, 22, 2; 234-243
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Theoretical and experimental analysis on the interaction properties between tracks and sediments considering sand content for unmanned underwater tracked bulldozer
Autorzy:
Li, Yong
He, Dingchang
Si, Qiaorui
Powiązania:
https://bibliotekanauki.pl/articles/2173566.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
unmanned underwater tracked bulldozer
underwater robot
river bed sediment
shear stress
pressure-sinkage
spychacz gąsienicowy bezzałogowy podwodny
robot podwodny
osad z koryta rzeki
naprężenie ścinające
spadek ciśnienia
Opis:
The unmanned underwater tracked bulldozer (UUTB) is an indispensable equipment for dredging and cleaning obstacles on the river bed in the flood season. The investigation on the interaction properties between the UUTB tracks and sediments provides foundation for the evaluation of operation performance when it works on the inland river bed. Based on the current worldwide research, the sediments mixed by sand, bentonite and water with sand content 0%, 10% and 20% were configured in this study to replace the real sediments on the inland river bed in China. The current pressure-sinkage model and shear stress-shear displacement model were discussed. Three different tracks were tested for the pressure-sinkage and the shear stress-shear displacement on the platform. The relationship between pressure and sinkage under sand content 0%, 10% and 20% are revealed based on the experimental results. The modulus of cohesive deformation and friction deformation of the sediments under said sand content are presented. The curves of shear stress and shear displacement are also obtained, which demonstrates the properties between the tracks and configured sediments under sand content 0%, 10% and 20%. The relationship between the tractive force and slip ratio with three different tracks under said sand content is also presented based on the quantitative analysis, which provides reference for the dynamics control and performance evaluation of UUTB on the inland river bed.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 1; art. no. e136036
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Theoretical and experimental analysis on the interaction properties between tracks and sediments considering sand content for unmanned underwater tracked bulldozer
Autorzy:
Li, Yong
He, Dingchang
Si, Qiaorui
Powiązania:
https://bibliotekanauki.pl/articles/2090708.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
unmanned underwater tracked bulldozer
underwater robot
river bed sediment
shear stress
pressure-sinkage
spychacz gąsienicowy bezzałogowy podwodny
robot podwodny
osad z koryta rzeki
naprężenie ścinające
spadek ciśnienia
Opis:
The unmanned underwater tracked bulldozer (UUTB) is an indispensable equipment for dredging and cleaning obstacles on the river bed in the flood season. The investigation on the interaction properties between the UUTB tracks and sediments provides foundation for the evaluation of operation performance when it works on the inland river bed. Based on the current worldwide research, the sediments mixed by sand, bentonite and water with sand content 0%, 10% and 20% were configured in this study to replace the real sediments on the inland river bed in China. The current pressure-sinkage model and shear stress-shear displacement model were discussed. Three different tracks were tested for the pressure-sinkage and the shear stress-shear displacement on the platform. The relationship between pressure and sinkage under sand content 0%, 10% and 20% are revealed based on the experimental results. The modulus of cohesive deformation and friction deformation of the sediments under said sand content are presented. The curves of shear stress and shear displacement are also obtained, which demonstrates the properties between the tracks and configured sediments under sand content 0%, 10% and 20%. The relationship between the tractive force and slip ratio with three different tracks under said sand content is also presented based on the quantitative analysis, which provides reference for the dynamics control and performance evaluation of UUTB on the inland river bed.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 1; e136036, 1--13
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza procesu transportu rumowiska unoszonego na tle dynamiki przepływów rzeki Pilicy z wykorzystaniem metod statystycznych
Application of statistical methods to analysing of the Pilica river suspended sediment transport depending on discharge-characteristic of a reservoir supply
Autorzy:
Kiedrzynska, E.
Jozwik, A.
Powiązania:
https://bibliotekanauki.pl/articles/60973.pdf
Data publikacji:
2006
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
Tematy:
rzeki
rzeka Pilica
przeplyw wody
dynamika przeplywu
rumowiska unoszone
transport rumowiska
analiza danych
analiza statystyczna
Zbiornik Sulejowski
eutrofizacja
Opis:
Badania realizowane w zlewni rzeki Pilicy, w ramach projektów badawczych KBN i środków ONZ, przyczyniają się do rozpoznania dynamiki procesu zasilania i eutrofizacji Zbiornika Sulejowskiego, a także służą opracowaniu naukowych podstaw ekohydrologicznego podejścia do ochrony zasobów wodnych. Artykuł przedstawia analizę procesu transportu rumowiska unoszonego na tle dynamiki przepływu rzeki Pilicy, pod kątem rozpoznania procesu zasilania Zbiornika Sulejowskiego materią mineralną i organiczną z wykorzystaniem metod analizy statystycznej. Metody te pozwalają na określenie powiązań i zależności pomiędzy wynikami opisującymi transport rumowiska unoszonego systemem rzecznym a przepływami niskimi, średnimi oraz wezbraniowymi.
Poland, as a member state of European Union, is obliged to implement Union Directives, aimed at achieving good ecological state of the environment. Which conforms to standards of EU member states. Sulejow Reservoir is a source of drinking water for Lodz Agglomeration in which severe symptoms of eutrophication have been observed. High catchment surface to reservoir surface ratio and agricultural use of catchment (64% of surface) result in high loads of sediments and nutrients (phosphorus among others) reaching the reservoir through the Pilica River. The aim of this paper is better understanding of processes of the suspended sediment transport by the Pilica River during low and high discharges. For an analysis methods offered by statistical pattern recognition theory has been used.
Źródło:
Infrastruktura i Ekologia Terenów Wiejskich; 2006, 4/3
1732-5587
Pojawia się w:
Infrastruktura i Ekologia Terenów Wiejskich
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Scale of pollutions with heavy metals in water and sediment of River Ibër from landfill in Kelmend, Kosovo
Autorzy:
Kadriu, Sadija
Sadiku, Milaim
Kelmendi, Mensur
Mulliqi, Ismet
Aliu, Mehush
Hyseni, Arbër
Powiązania:
https://bibliotekanauki.pl/articles/89156.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
Tematy:
river
waters
sediments
heavy metals
Opis:
Pollution with heavy metals and waters in Mitrovica with surroundings, both in the past and in present days, is a preoccupation for the citizens of Mirtovica, as well as for the other inhabitants living around it. Such a problem has been a concern which still continues for a number of researchers who have been dealing with this issue, and who still continue to be preoccupied with the issue of heavy metal (habitat) pollution in this part of Kosovo. Heavy metal's contamination of the environment's main components, dates back to the 1970s/90s to this date. This pollution, especially of the rivers, is due to the industrial activity taking place in the Trepça Combine and the presence of industrial landfill sites of this Combine near the flow of two main rivers: the Sitnica and Ibër River waters, in the city of Mitrovica. The focus of our study, this time consists solely in the research and illumination of pollution with these heavy metals and waterworks of the Ibër River, as a result of the pollution caused by the industrial waste landfill located in Kelmend village. In the paper, we have attempted to show the concentration of heavy metals in sediment and water, by pointing at four sample sites of the Ibër river: in the Bosniak U1 neighborhood, then in the flow in front the U2 landfill, discharge flows from landfill U3 and a certain distance from the U4 landfill.
Źródło:
Mining Science; 2019, 26; 147-155
2300-9586
2353-5423
Pojawia się w:
Mining Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of bottom position changes in a lowland river on the basis of sediment transport
Autorzy:
Coufal, R.
Meyer, Z.
Powiązania:
https://bibliotekanauki.pl/articles/241067.pdf
Data publikacji:
2001
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
Odra River
bed position
sediment transport rate
Ackers-White's method
Opis:
The paper present an analysis of changes in the Odra River bed position, which is based upon the evaluations of intensity of the sediment transport rate, which is spe-cified by the modified Ackers-White's method. The case of flow between groins and the change of hydraulic conditions has been presented for the newly designed longit-udinal dam. The analyses were carried out for different flow intensities, comparing the results achieved with the measurement in the Hohensaaten-Bielinek section.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2001, 48, 3; 7-16
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Exposure assessment of heavy metals pollution enriched in core sediment samples of river Nile, Aswan, Egypt
Autorzy:
Fawzy, E.M.
Rashed, M.N.
Soltan, M.E.
Powiązania:
https://bibliotekanauki.pl/articles/9993.pdf
Data publikacji:
2017
Wydawca:
Fundacja na Rzecz Młodych Naukowców
Tematy:
exposure assessment
heavy metal
environment pollution
core
sediment
Nile River
Aswan city
Egypt
Opis:
The river Nile is a dominating physical feature of the north- eastern part of the African continent, covering areas exhibiting varieties and contrasts in topography, climate vegetation and people. So, in this study, we estimated the contamination of the Nile sediment with some major and trace heavy metals in core samples which can cause some undesirable health effects. Concentrations of all elements shows that the maximum enrichment is found in the top subsamples, while the most elements shows low contents in the lower layer reflecting the impact of human activity on the sediment contents. Different normalizing methods were used, i.e. geoaccumulation (Igeo) and enrichment factor (EF), for the influence of the natural variability in sediment mineralogy and to assess whether the concentrations observed in surface sediment represent background or contaminated levels. The study has also shown the importance of different sediment characteristics in spatial distribution of heavy metals in the sediments of river Nile. To protect the ecological system of river Nile watershed, industrial mining and agricultural activities along river stream should to be strictly regulated.
Źródło:
Environment, Earth and Ecology; 2017, 1, 1
2543-9774
2451-4225
Pojawia się w:
Environment, Earth and Ecology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of conditions of suspended sediment transport in river and water reservoir
Określenie warunków transportu rumowiska unoszonego w rzece i w zbiorniku wodnym
Autorzy:
Michalec, B.
Tarnawski, M.
Powiązania:
https://bibliotekanauki.pl/articles/81889.pdf
Data publikacji:
2008
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
determination
condition
suspended sediment transport
river
water reservoir
sediment transport
suspended sediment concentration
transport parameter
suspended load transport
bottom material
Opis:
The carried out measurement of waters flow and suspended sediment concentration in the river Wisłoka and the small water reservoir at Krempna constituted the basis of determination of conditions of suspended load transport at low water flow according to van Rijn’s criteria (1984). The results of measurements carried out in the river and in the reservoir permitted elaboration of profi les of suspended sediment concentration Ca on the reference level “a”. The reference level was established according to van Rijn’s methods. In the river the reference level was adopted as 0.5 of the diameter of the biggest particle, and in the water reservoir 0.01 of elevation in a given hydrometric vertical. Measurement were performed at a flow equalling 0.89 m3⋅s–1. Concentration Ca in the river in fi ve hydrometric verticals, determined from the concentration profile, ranged from 11.4 to 25.3 g⋅m–3. The concentration value, calculated according to van Rijn’s formula was within the range 11.2–36.5 g⋅m–3 and the average it was over 26% higher than that determined from the concentration profile. In the water reservoir concentration measurements were performed in appointed verticals in eight cross-sections. At a flow 0.89 m3⋅s–1 in the water reservoir critical bed shear velocities causing movement of bottom material will not be exceeded. The calculated stage transport parameter (T) equaled from –0.9961 to –0.9996 in particular verticals of cross-sections. With regard to the negative values of the stage transport parameter (T) it proved impossible to calculate concentration Ca in the reservoir by use of the van Rijn’s formula.
Określenie ilości rumowiska unoszonego transportowanego w rzekach jest istotne ze względu na zamulanie zbiorników wodnych. Opisanie warunków transportu rumowiska unoszonego na podstawie badań empirycznych wiąże się z koniecznością wprowadzenia parametrów hydraulicznych opisujących przepływ wody i parametrów charakteryzujących rumowisko unoszone. Badania warunków transportu rumowiska unoszonego przeprowadzono w rzece Wisłoce i w zbiorniku wodnym w Krempnej na podstawie teorii podanej przez van Rijna [1984]. Zaproponowane przez van Rijna empiryczne równanie służące obliczeniu tej koncentracji uwzględnia podstawowe parametry, takie jak: parametr ziarnowy (D*) i parametr transportu (T). Ocena możliwości zastosowania tej metody wiąże się z określeniem warunków transportu rumowiska unoszonego. Na podstawie przeprowadzonych badań w rzece i małym zbiorniku wodnym, obejmujących pomiary przepływu wody i koncentracji rumowiska unoszonego, określono warunki transportu rumowiska przy przepływie niskim według kryteriów podanych przez van Rijna [1984], a także na podstawie opracowanych profi li koncentracji obliczono koncentrację na poziomie odniesienia „a”. Wykonane pomiary przepływu wody i koncentracji rumowiska unoszonego w rzece Wisłoce i małym zbiorniku wodnym w Krempnej stanowiły podstawę określenia warunków transportu rumowiska przy przepływie niskim, według kryteriów podanych przez van Rijna [1984]. Wyniki pomiarów w rzece i w zbiorniku umożliwiły opracowanie profi li koncentracji i określenie koncentracji rumowiska unoszonego Ca na poziomie odniesienia „a”. Poziom odniesienia ustalono według metodyki van Rijna. W rzece przyjęto poziom odniesienia równy 0,5 średnicy największego ziarna, a w zbiorniku równy 0,01 napełnienia w danym pionie hydrometrycznym. Pomiary wykonano przy przepływie wynoszącym 0,89 m3⋅s–1. Koncentracja Ca w pięciu pionach hydrometrycznych, określona z profi li koncentracji, wynosiła od 11,4 do 25,3 g⋅m–3. Obliczona wzorem van Rijna wartość koncentracji Ca mieściła się w przedziale 11,2–36,5 g⋅m–3 i była średnio ponad 26% wyższa od określonej z profi li koncentracji. W zbiorniku wodnym przy przepływie 0,89 m3⋅s–1 nie zostaną przekroczone krytyczne prędkości ścinające, powodujące ruch materiału dennego. Obliczony parametr transportu (T) w poszczególnych pionach przekroi poprzecznych wynosił od –0,9961 do –0,9996. Ze względu na ujemne wartości parametru transportu (T) niemożliwe okazało się obliczenie koncentracji Ca w zbiorniku. Została ona ustalona z profi li koncentracji. Przy przepływie średnim niskim w rzece Wisłoce koncentracja Ca rumowiska unoszonego, określona według metodyki van Rijna jest średnio ponad 26% wyższa od określonej z profi li koncentracji. Koncentracja na poziomie odniesienia „a” określona z profili koncentracji opracowanych według danych z pięciu pionów hydrometrycznych wynosiła od 11,4 do 25,3 g⋅m–3. Najwyższe koncentracje odnotowano w głównym nurcie rzeki. Określenie koncentracji Ca w zbiorniku wodnym przy przepływie 0,89 m3⋅s–1 według wzoru van Rijna nie jest możliwe, gdyż ze względu na panujące warunki hydrodynamiczne nie zostają przekroczone krytyczne prędkości ścinające (u*cr), powodujące ruch mineralnego materiału dennego.
Źródło:
Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation; 2008, 39
0208-5771
Pojawia się w:
Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Relacje między wybranymi formami fosforu a rumowiskiem unoszonym w rzece Zagożdżonce
Relation between chosen phosphorus forms and suspended sediment in Zagozdzonka River
Autorzy:
Hejduk, L.
Powiązania:
https://bibliotekanauki.pl/articles/886409.pdf
Data publikacji:
2011
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
rzeka Zagozdzonka
hydrologia
rumowiska unoszone
fosfor
zlewnie rolnicze
Źródło:
Scientific Review Engineering and Environmental Sciences; 2011, 20, 4[54]
1732-9353
Pojawia się w:
Scientific Review Engineering and Environmental Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Water and Sediment Quality Status of the Toplluha River in Kosovo
Autorzy:
Shehu, Ilir
Powiązania:
https://bibliotekanauki.pl/articles/124899.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
water
sediment
quality
river
Toplluha river
Kosovo
Opis:
The surface water quality and level of metal contents in the contamination of the Toplluha river sediment were determined by means of statistical techniques and pollution indicators. The samples of water and sediments were taken in five different locations along the Toplluha river in the spring period 2013 and 2019 using standard methods for analysis. International standards (WHO 2004) were used to assess the quality of water. The samples of water in some of the locations were above these criteria levels. The heavy metal contents in the sediment were in the following order: Cu > Zn > Cr > Ni > Pb > Cd. For the evaluation of the heavy metal content, some factors were applied: enrichment factor (EF), pollution load index (PLI) and index of geoccumulation (Igeo). Cu and Pb have a significance enrichment according to the calculated EF values. The Igeo index values for Cu and Zn were at a higher level. The PLI index values were at a progressive high level from stations S3 to S5. Therefore, the preliminary treatment of the discharging waters is indispensable.
Źródło:
Journal of Ecological Engineering; 2019, 20, 11; 266-275
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
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