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Dr. Dariusz Młyński
Department of Sanitary Engineering and Water Management, University of Agriculture in Krakow, 30-059 Krakow, Poland

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0 Climate Change
0 Flood
0 Drought
0 wastewater management
0 Mathematical modeling in hydrology and meteorology

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Journal article
Published: 16 December 2020 in Sustainability
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The paper presents modelling of wastewater treatment plant (WWTP) operation work efficiency using a two-stage method based on selected probability distributions and the Monte Carlo method. Calculations were carried out in terms of sewage susceptibility to biodegradability. Pollutant indicators in raw sewage and in sewage after mechanical treatment and biological treatment were analysed: BOD5, COD, total suspended solids (TSS), total nitrogen (TN) and total phosphorus (TP). The compatibility of theoretical and empirical distributions was assessed using the Anderson–Darling test. The best-fitted statistical distributions were selected using Akaike criterion. Performed calculations made it possible to state that out of all proposed methods, the Gaussian mixture model (GMM) for distribution proved to be the best-fitted. Obtained simulation results proved that the statistical tools used in this paper describe the changes of pollutant indicators correctly. The calculations allowed us to state that the proposed calculation method can be an effective tool for predicting the course of subsequent sewage treatment stages. Modelling results can be used to make a reliable assessment of sewage susceptibility to biodegradability expressed by the BOD5/COD, BOD5/TN and BOD5/TP ratios. New data generated this way can be helpful for the assessment of WWTP operation work and for preparing different possible scenarios for their operation.

ACS Style

Dariusz Młyński; Anna Młyńska; Krzysztof Chmielowski; Jan Pawełek. Investigation of the Wastewater Treatment Plant Processes Efficiency Using Statistical Tools. Sustainability 2020, 12, 10522 .

AMA Style

Dariusz Młyński, Anna Młyńska, Krzysztof Chmielowski, Jan Pawełek. Investigation of the Wastewater Treatment Plant Processes Efficiency Using Statistical Tools. Sustainability. 2020; 12 (24):10522.

Chicago/Turabian Style

Dariusz Młyński; Anna Młyńska; Krzysztof Chmielowski; Jan Pawełek. 2020. "Investigation of the Wastewater Treatment Plant Processes Efficiency Using Statistical Tools." Sustainability 12, no. 24: 10522.

Journal article
Published: 10 November 2020 in Sustainability
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The aim of this study was to identify the form of the dependence describing the relationship between rainfall (P) and the curve number (CN) parameter using the Natural Resources Conservation Service (NRCS-CN) method in the mountain catchments of the Western Carpathians. The study was carried out in 28 catchments areas in the Western Carpathians in the Upper Vistula Basin, Poland. The study was conducted in the following stages: determination of the volume of the direct runoff using the NRCS-CN method, determination of the P–CN relationship using asymptotic functions, kinetic equation and complementary error function; determination of the volume of the direct runoff from the catchment area, accounting for the correction of the decline; determination of the value of the efficiency coefficient of the analysed models. On the basis of the conducted study, a strong relationship was found between the direct runoff and the rainfall that caused it. The study showed that the empirical values of the CN parameter differed from the values determined on the basis of the volume of rainfall and runoff. The vast majority of study catchments were characterised by a standard P–CN relationship. The kinetic model was found to be the best model to describe the P–CN relationship. The asymptotic model showed the greatest stability for high rainfall episodes. It was shown that the application of the catchment slope correction improved the quality of the NRCS-CN model.

ACS Style

Dariusz Młyński; Andrzej Wałęga. Identification of the Relationship between Rainfall and the CN Parameter in Western Carpathian Mountain Catchments in Poland. Sustainability 2020, 12, 9317 .

AMA Style

Dariusz Młyński, Andrzej Wałęga. Identification of the Relationship between Rainfall and the CN Parameter in Western Carpathian Mountain Catchments in Poland. Sustainability. 2020; 12 (22):9317.

Chicago/Turabian Style

Dariusz Młyński; Andrzej Wałęga. 2020. "Identification of the Relationship between Rainfall and the CN Parameter in Western Carpathian Mountain Catchments in Poland." Sustainability 12, no. 22: 9317.

Journal article
Published: 22 October 2020 in Sustainability
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Environmental flow assessments (e-flows) are relatively new practices, especially in developing countries such as Nepal. This study presents a comprehensive analysis of the influence of hydrologically based e-flow methods in the natural flow regime. The study used different hydrological-based methods, namely, the Global Environmental Flow Calculator, the Tennant method, the flow duration curve method, the dynamic method, the mean annual flow method, and the annual distribution method to allocate e-flows in the Kaligandaki River. The most common practice for setting e-flows consists of allocating a specific percentage of mean annual flow or portion of flow derived from specific percentiles of the flow duration curve. However, e-flow releases should mimic the river’s intra-annual variability to meet the specific ecological function at different river trophic levels and in different periods over a year covering biotas life stages. The suitability of the methods was analyzed using the Indicators of Hydrological Alterations and e-flows components. The annual distribution method and the 30%Q-D (30% of daily discharge) methods showed a low alteration at the five global indexes for each group of Indicators of Hydrological Alterations and e-flows components, which allowed us to conclude that these methods are superior to the other methods. Hence, the study results concluded that 30%Q-D and annual distribution methods are more suitable for the e-flows implementation to meet the riverine ecosystem’s annual dynamic demand to maintain the river’s health. This case study can be used as a guideline to allocate e-flows in the Kaligandaki River, particularly for small hydropower plants.

ACS Style

Naresh Suwal; Alban Kuriqi; Xianfeng Huang; João Delgado; Dariusz Młyński; Andrzej Walega. Environmental Flows Assessment in Nepal: The Case of Kaligandaki River. Sustainability 2020, 12, 8766 .

AMA Style

Naresh Suwal, Alban Kuriqi, Xianfeng Huang, João Delgado, Dariusz Młyński, Andrzej Walega. Environmental Flows Assessment in Nepal: The Case of Kaligandaki River. Sustainability. 2020; 12 (21):8766.

Chicago/Turabian Style

Naresh Suwal; Alban Kuriqi; Xianfeng Huang; João Delgado; Dariusz Młyński; Andrzej Walega. 2020. "Environmental Flows Assessment in Nepal: The Case of Kaligandaki River." Sustainability 12, no. 21: 8766.

Journal article
Published: 14 October 2020 in Sustainability
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The use of the Mike11 one-dimensional (1D) hydraulic model, together with official hydrology, represents a standard approach of the National Water Management Authority (NWMA) in Poland for flood mapping procedures. A different approach, based on the hydrological Event-Based Approach for Small and Ungauged Basins (EBA4SUB) model and the Flood-2 Dimensional (FLO-2D) hydraulic model has here been investigated as an alternative procedure. For the analysis, two mountainous rivers in Poland were selected: Kamienica Nawojowska is characterized by a narrow valley, while Skawinka has a broad valley. It was found that the flood zones can enormously differ locally, with larger zones generated by the Mike11/NWMA model in some cases and by the EBA4SUB/FLO-2D model in other situations. The benefits of using the two-dimensional (2D) model are consistent in areas without drainage and where the connection to the main channel is insufficient. The use of 1D modeling is preferred for the possibility of mapping the entire river network in a short computational time.

ACS Style

Andrea Petroselli; Jacek Florek; Dariusz Młyński; Leszek Książek; Andrzej Wałęga. New Insights on Flood Mapping Procedure: Two Case Studies in Poland. Sustainability 2020, 12, 8454 .

AMA Style

Andrea Petroselli, Jacek Florek, Dariusz Młyński, Leszek Książek, Andrzej Wałęga. New Insights on Flood Mapping Procedure: Two Case Studies in Poland. Sustainability. 2020; 12 (20):8454.

Chicago/Turabian Style

Andrea Petroselli; Jacek Florek; Dariusz Młyński; Leszek Książek; Andrzej Wałęga. 2020. "New Insights on Flood Mapping Procedure: Two Case Studies in Poland." Sustainability 12, no. 20: 8454.

Journal article
Published: 02 September 2020 in Sustainability
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This work aimed to quantify how the different parameters of the Snyder model influence the errors in design flows. The study was conducted for the Kamienica Nowojowska catchment (Poland). The analysis was carried out according to the following stages: determination of design precipitation, determination of design hyetograph, sensitivity analysis of the Snyder model, and quality assessment of the Snyder model. Based on the conducted research, it was found that the Snyder model did not show high sensitivity to the assumed precipitation distribution. The parameters depending on the retention capacity of the catchment had much greater impact on the obtained flow values. The verification of the model quality showed a significant disproportion in the calculated maximum flow values with the assumed return period.

ACS Style

Dariusz Młyński. Analysis of Problems Related to the Calculation of Flood Frequency Using Rainfall-Runoff Models: A Case Study in Poland. Sustainability 2020, 12, 7187 .

AMA Style

Dariusz Młyński. Analysis of Problems Related to the Calculation of Flood Frequency Using Rainfall-Runoff Models: A Case Study in Poland. Sustainability. 2020; 12 (17):7187.

Chicago/Turabian Style

Dariusz Młyński. 2020. "Analysis of Problems Related to the Calculation of Flood Frequency Using Rainfall-Runoff Models: A Case Study in Poland." Sustainability 12, no. 17: 7187.

Journal article
Published: 10 July 2020 in Water
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Urban development causes multiple water losses. Some of them may be ignored but some could have a huge influence on the whole catchment, including soil drought. As urban sprawl rises, space for unaffected infiltration and retention is increasingly limited. The objective of this study was to backcast and to estimate water-retention loss due to urbanization during the period of 1990–2018. We used landcover data, meteorological and hydrological data and data on soil water-holding capacity. Water-retention loss was expressed as soil water retention capacity loss, net precipitation loss and total sum of precipitation loss. Historical change in urban extension has led to large impacts on the hydrological cycle of the study area. Progressive urban development caused water-retention losses which range from 3.380 to 14.182 millions of cubic meters—depending on the methodology used. Hydrological analysis showed the lack of a significant trend (decrease trend) of low flow which is caused by the high percentage of natural land use in the upper part of catchment. Our results show that backcasting of water retention change using CLC data (a) brings new and plausible data on retention loss, (b) is possible to replicate and (c) data used are common and easy-to-get.

ACS Style

Tomáš Lepeška; Jakub Wojkowski; Andrzej Wałęga; Dariusz Młyński; Artur Radecki-Pawlik; Branislav Olah. Urbanization—Its Hidden Impact on Water Losses: Prądnik River Basin, Lesser Poland. Water 2020, 12, 1958 .

AMA Style

Tomáš Lepeška, Jakub Wojkowski, Andrzej Wałęga, Dariusz Młyński, Artur Radecki-Pawlik, Branislav Olah. Urbanization—Its Hidden Impact on Water Losses: Prądnik River Basin, Lesser Poland. Water. 2020; 12 (7):1958.

Chicago/Turabian Style

Tomáš Lepeška; Jakub Wojkowski; Andrzej Wałęga; Dariusz Młyński; Artur Radecki-Pawlik; Branislav Olah. 2020. "Urbanization—Its Hidden Impact on Water Losses: Prądnik River Basin, Lesser Poland." Water 12, no. 7: 1958.

Journal article
Published: 20 May 2020 in Water
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The aim of the study was to analyze the possibility of using selected rainfall-runoff models to determine the design hydrograph and the related peak flow in a mountainous catchment. The basis for the study was the observed series of hydrometeorological data for the Grajcarek catchment area (Poland) for the years 1981–2014. The analysis was carried out in the following stages: verification of hydrometeorological data; determination of the design rainfall; and determination of runoff hydrographs with the following rainfall-runoff models: Snyder, NRCS-UH, and EBA4SUB. The conducted research allowed the conclusion that the EBA4SUB model may be an alternative to other models in determining the design hydrograph in ungauged mountainous catchments. This is evidenced by the lower values of relative errors in the estimation of peak flows with an assumed frequency for the EBA4SUB model, as compared to Snyder and NRCS-UH.

ACS Style

Dariusz Młyński; Andrzej Wałęga; Leszek Książek; Jacek Florek; Andrea Petroselli. Possibility of Using Selected Rainfall-Runoff Models for Determining the Design Hydrograph in Mountainous Catchments: A Case Study in Poland. Water 2020, 12, 1450 .

AMA Style

Dariusz Młyński, Andrzej Wałęga, Leszek Książek, Jacek Florek, Andrea Petroselli. Possibility of Using Selected Rainfall-Runoff Models for Determining the Design Hydrograph in Mountainous Catchments: A Case Study in Poland. Water. 2020; 12 (5):1450.

Chicago/Turabian Style

Dariusz Młyński; Andrzej Wałęga; Leszek Książek; Jacek Florek; Andrea Petroselli. 2020. "Possibility of Using Selected Rainfall-Runoff Models for Determining the Design Hydrograph in Mountainous Catchments: A Case Study in Poland." Water 12, no. 5: 1450.

Journal article
Published: 30 March 2020 in Water
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Designing hydraulic structures, such as culverts, bridges, weirs, and check dams, while planning new flood inundation areas, needs correct assessment of design discharges. In gauged catchments with long time series of discharges, statistical methods are commonly used based on fixed theoretical distributions and on empirical distributions. However, in ungauged catchments, this approach is not possible. In addition to more advanced methods, which are used today, e.g., rainfall–runoff models, much more simple approaches are still needed based on regionalization and empirical models. Thus, the objective of this work is to develop a new empirical model for calculating peak discharge expressed as the median of annual peak discharge (QMED). The innovative aspect of this paper is the use of a new parameter, named landscape hydric potential (LHP), as a descriptor of water storage in catchments. LHP has a crucial role as the descriptor of water storage in catchment and, thus, it has an influence on forming discharges. The work was done in the Upper Vistula basin in the Polish Carpathians. This study was carried out in mountain catchments located in the Upper Vistula basin, in the south part of Poland in in the Polish Carpathians. Results show that the proposed model could provide appropriate calculations in changing climate conditions, as well as when land use is changed. The proposed model is simple and effective; for calculating QMED, it needs only two parameters: catchment area and LHP. Since the model has a significant and high correlation coefficient, it could be used for assessing of QMED in ungauged mountain catchments. The determined form of the empirical equation finds application in the entire Upper Vistula basin, for catchments with a surface area from 24 km2 up to 660 km2.

ACS Style

Andrzej Wałęga; Dariusz Młyński; Jakub Wojkowski; Artur Radecki-Pawlik; Tomáš Lepeška. New Empirical Model Using Landscape Hydric Potential Method to Estimate Median Peak Discharges in Mountain Ungauged Catchments. Water 2020, 12, 983 .

AMA Style

Andrzej Wałęga, Dariusz Młyński, Jakub Wojkowski, Artur Radecki-Pawlik, Tomáš Lepeška. New Empirical Model Using Landscape Hydric Potential Method to Estimate Median Peak Discharges in Mountain Ungauged Catchments. Water. 2020; 12 (4):983.

Chicago/Turabian Style

Andrzej Wałęga; Dariusz Młyński; Jakub Wojkowski; Artur Radecki-Pawlik; Tomáš Lepeška. 2020. "New Empirical Model Using Landscape Hydric Potential Method to Estimate Median Peak Discharges in Mountain Ungauged Catchments." Water 12, no. 4: 983.

Journal article
Published: 30 January 2020 in Science of The Total Environment
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The classification of river catchments according to their hydrological regime is crucial elements of regionalisation. In absence of hydrological data, the regionalisation of catchment method may be used to asses many flows characteristics like regime or design flow and thus provide help in the analysis of hydrological and ecological processes and also in the management of water resources. Correct clarification of catchments requires knowledge about the main factors that influence on river regime, like meteorologic conditions, land cover/land use, geology, soil properties terrain features, human activities. The aim of the study was to analyse the relationship between selected catchment attributes along with precipitation climatology and seasonality of mean flows (MQ) in the mountainous rivers in the Upper Vistula basin (the biggest and the most important river in Poland) and regionalisation catchments based on seasonality index. To achieve the objective of the study, we concentrated on the mountain stream and river catchments that are regionalised to the Upper Vistula basin (all of which are Vistula tributaries) and we employed the Colwell's seasonality index in an attempt to clear up the said ecohydrological measures. The study confirmed that in mountainous catchments, where response time to rainfall is shorter due to larger slopes, higher seasonality of mean monthly discharges, as expressed by the seasonality index M, is observed. In this case, variability of seasonal rainfall affected seasonality of MQ. In case of smaller slopes and large forest cover and catchment areas, seasonality of flows was lower. The innovative aspect of the presented study is the attempt to correlate the Colwell's seasonality index with the physiographic and meteorological characteristics of the catchment. Until now, the characteristics of the catchments have been used as factors differentiating the hydrological regime of the catchments, thus allowing for agglomeration of similar catchments. Our results foster better understanding of the natural processes in the river basin, which definitely would help in better management of the environment and its relationship with huge number of people living there and depend on it. These results show that the regression tree methods based on CART algorithm can be used as effective tool for classification of catchments.

ACS Style

Artur Radecki-Pawlik; Andrzej Wałęga; Dariusz Młyński; Wojciech Młocek; Rafał Kokoszka; Tamara Tokarczyk; Wiwiana Szalińska. Seasonality of mean flows as a potential tool for the assessment of ecological processes: Mountain rivers, Polish Carpathians. Science of The Total Environment 2020, 716, 136988 .

AMA Style

Artur Radecki-Pawlik, Andrzej Wałęga, Dariusz Młyński, Wojciech Młocek, Rafał Kokoszka, Tamara Tokarczyk, Wiwiana Szalińska. Seasonality of mean flows as a potential tool for the assessment of ecological processes: Mountain rivers, Polish Carpathians. Science of The Total Environment. 2020; 716 ():136988.

Chicago/Turabian Style

Artur Radecki-Pawlik; Andrzej Wałęga; Dariusz Młyński; Wojciech Młocek; Rafał Kokoszka; Tamara Tokarczyk; Wiwiana Szalińska. 2020. "Seasonality of mean flows as a potential tool for the assessment of ecological processes: Mountain rivers, Polish Carpathians." Science of The Total Environment 716, no. : 136988.

Journal article
Published: 27 December 2019 in Water
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The aim was to assess the stability of the chemical composition of the groundwater in terms of maintaining the status of therapeutic waters in accordance with the Geological and Mining Law in Poland. The basis for the analysis was the results of stationary observations for nine hydrogeological wells for the needs of the Mineral Water Bottling Plant “Piwniczanka”. The database used for the analysis covered the years 2008–2018 and concerned the content of selected ions as well as total dissolved solids and CO2 content. For each of the analyzed boreholes, the analysis of the variability of the content was performed using graphical Schoeller–Berkaloff plots and statistical investigations (GWSDAT and STATISTICA). This hydrogeochemical investigation has demonstrated that groundwater in the Piwniczna area occur as natural “carbonated waters” and “waters containing carbon dioxide”. Summing up the analysis, it can be stated that the content of basic ions of the exploited water show a small variability and does not threaten the loss of therapeutic water status for seven of the boreholes. Two of them have a little risk of loss of therapeutic water status. Variable content of sodium ions causes changes in the hydrogeochemical type of water without affecting the maintenance of the status.

ACS Style

Karolina Kurek; Agnieszka Operacz; Piotr Bugajski; Dariusz Młyński; Andrzej Wałęga; Jan Pawełek. Prediction of the Stability of Chemical Composition of Therapeutic Groundwater. Water 2019, 12, 103 .

AMA Style

Karolina Kurek, Agnieszka Operacz, Piotr Bugajski, Dariusz Młyński, Andrzej Wałęga, Jan Pawełek. Prediction of the Stability of Chemical Composition of Therapeutic Groundwater. Water. 2019; 12 (1):103.

Chicago/Turabian Style

Karolina Kurek; Agnieszka Operacz; Piotr Bugajski; Dariusz Młyński; Andrzej Wałęga; Jan Pawełek. 2019. "Prediction of the Stability of Chemical Composition of Therapeutic Groundwater." Water 12, no. 1: 103.

Journal article
Published: 03 December 2019 in Journal of Cleaner Production
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The paper analyses selected problems with the estimation of environmental flows (EF) in the aspect of hydroelectric potential of rivers. The study was conducted for mountain catchments located in the upper Vistula catchment in Poland: Mszanka, Poroniec, Grajcarek, Ochotnica, and Kamienica Nawojowska. The data for calculations, in the form of observational series of daily flows in the years 1985-2014, were obtained from the Institute of Meteorology and Water Management of the National Research Institute in Warsaw. Based on the data, environmental flows were calculated as 25% Mean Annual Flow (MAF), 70% Median Flow, Q90, 7Q10, 7Q2, and additionally with the Eflows Management Framework and Upscaling method (EMFU). The calculations made it possible to indicate the main problems related to the calculation of environmental flows using hydrological methods: selection of the appropriate characteristic flow, the method of determining guaranteed flows, selection of appropriate statistical distributions or sensitivity of environmental flows to the length of the observation series for which they are esteemed. In addition, the paper showed that the choice of method for calculating the environmental flow influences the volume of electricity production in hydroelectric plants. For watercourses not covered by specific forms of protection, the compromise between environmental protection and investment economics seems to be calculating the EF value by 25% MAF or Q90. It was also found that it is optimal to maintain the value of EF (from the point of view of caring caring for the aquatic environment) along with choosing the economically justified options.

ACS Style

Dariusz Młyński; Agnieszka Operacz; Andrzej Wałęga. Sensitivity of methods for calculating environmental flows based on hydrological characteristics of watercourses regarding the hydropower potential of rivers. Journal of Cleaner Production 2019, 250, 119527 .

AMA Style

Dariusz Młyński, Agnieszka Operacz, Andrzej Wałęga. Sensitivity of methods for calculating environmental flows based on hydrological characteristics of watercourses regarding the hydropower potential of rivers. Journal of Cleaner Production. 2019; 250 ():119527.

Chicago/Turabian Style

Dariusz Młyński; Agnieszka Operacz; Andrzej Wałęga. 2019. "Sensitivity of methods for calculating environmental flows based on hydrological characteristics of watercourses regarding the hydropower potential of rivers." Journal of Cleaner Production 250, no. : 119527.

Journal article
Published: 16 May 2019 in Science of The Total Environment
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This study aimed to determine the link between a hydric potential of catchments (LHP) and the predictability (P) of maximum flow of selected rivers in southern Poland (within the Upper Vistula basin) and Slovakia. The LHP method refers to the ability of ecosystems to slow down runoff and retain water. The LHP method is focused on the analysis of the following indicators, shaping the geosphere at the catchment scale: hydrogeological conditions, soil conditions, meteorological conditions, geomorphological conditions, and land use. The predictability of river flows, calculated as one of the Colwell's indices, represents a measure of confidence with regard to the state of a flood event at a given point. To determine links between the LHP and P, a cluster analysis was used with the Ward method of agglomeration. The mean LHP varied between 1.2 for the Skawa River and 20.1 for the Vistula River. Only the Vistula River has very high LHP. The rest of the investigated rivers had medium and low values of LHP. The mean predictability of maximum flows for all rivers was relatively high (0.54), with the highest value obtained for the Wisłok River (0.69) and the lowest one for the Białka River (0.40). Cluster analysis showed that the studied catchments may be aggregated into four homogeneity clusters: first - catchments with high P and limited LHP, second - catchments with mean P and low LHP, third - with low P and average LHP and fourth - with very high P and medium and excellent LHP. The results are important for the management of catchments, especially for planning of any land use changes and investment projects related to water retention.

ACS Style

Jakub Wojkowski; Dariusz Młyński; Tomas Lepeška; Andrzej Wałęga; Artur Radecki-Pawlik. Link between hydric potential and predictability of maximum flow for selected catchments in Western Carpathians. Science of The Total Environment 2019, 683, 293 -307.

AMA Style

Jakub Wojkowski, Dariusz Młyński, Tomas Lepeška, Andrzej Wałęga, Artur Radecki-Pawlik. Link between hydric potential and predictability of maximum flow for selected catchments in Western Carpathians. Science of The Total Environment. 2019; 683 ():293-307.

Chicago/Turabian Style

Jakub Wojkowski; Dariusz Młyński; Tomas Lepeška; Andrzej Wałęga; Artur Radecki-Pawlik. 2019. "Link between hydric potential and predictability of maximum flow for selected catchments in Western Carpathians." Science of The Total Environment 683, no. : 293-307.

Journal article
Published: 26 April 2019 in Water
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The aim of the present work was the modeling of the wastewater treatment plant operation work using Monte Carlo method and different random variables probability distributions modeling. The analysis includes the following pollutants indicators; BOD5 (Biochemical Oxygen Demand), CODCr (Chemical Oxygen Demand), Total Suspended Solids (SSt), Total Nitrogen (TN), and Total Phosphorus (TP). The Anderson–Darling (A–D) test was used for the assessment of theoretical and empirical distributions compatibility. The selection of the best-fitting statistical distributions was performed using peak-weighted root mean square (PWRMSE) parameter. Based on the performed calculations, it was stated that pollutants indicators in treated sewage were characterized by a significant variability. Obtained results indicate that the best-fitting pollutants indicators statistical distribution is Gauss Mixed Model (GMM) function. The results of the Monte Carlo simulation method confirmed that some problems related to the organic and biogenic pollutants reduction may be observed in the Wastewater Treatment Plant, in Jaworzno.

ACS Style

Dariusz Młyński; Piotr Bugajski; Anna Młyńska. Application of the Mathematical Simulation Methods for the Assessment of the Wastewater Treatment Plant Operation Work Reliability. Water 2019, 11, 873 .

AMA Style

Dariusz Młyński, Piotr Bugajski, Anna Młyńska. Application of the Mathematical Simulation Methods for the Assessment of the Wastewater Treatment Plant Operation Work Reliability. Water. 2019; 11 (5):873.

Chicago/Turabian Style

Dariusz Młyński; Piotr Bugajski; Anna Młyńska. 2019. "Application of the Mathematical Simulation Methods for the Assessment of the Wastewater Treatment Plant Operation Work Reliability." Water 11, no. 5: 873.

Article
Published: 28 March 2019 in Environmental Monitoring and Assessment
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The scarcity of water can result in a direct conflict between the protection of aquatic resources and water use. For many agencies, environmental flow (EF) methods are essential in environmental impact assessments and in the protection of important fisheries resources. The objective of this paper is to compare selected hydrological and hydraulic methods and determine the scientifically acceptable and cost-effective way to environmental flow within a section of a mountain river with high naturalness, on the example of the Wisłoka. In this paper, environmental flow was calculated using conventional hydrological methods: Tennant’s, Tessman’s, flow duration curve and hydraulic methods, wetted perimeter method (WPM) and method based directly on ichthyofauna habitat requirements (spawn and migration). The novelty is the combined use of the hydraulic and hydrological methods which relates to flow hydraulics based directly on ichthyofauna habitat conditions. The hydraulic methods provide lower values of environmental flow in comparison with the hydrological methods. The key issue in the use of the hydraulic methods is the choice of criteria. The development of the required set of parameters while taking into account their seasonal nature shifts the method toward habitat modeling methods. However, the scope of habitat requirements of ecosystems must be defined, including the set of aquatic organisms and watercourse type before a hydraulic method may be widely used. Being generally low-cost and simple, the methods presented in this paper can be applied in the water management legislative process.

ACS Style

Leszek Książek; Agnieszka Woś; Jacek Florek; Maciej Wyrębek; Dariusz Młyński; Andrzej Wałęga. Combined use of the hydraulic and hydrological methods to calculate the environmental flow: Wisloka river, Poland: case study. Environmental Monitoring and Assessment 2019, 191, 1 -17.

AMA Style

Leszek Książek, Agnieszka Woś, Jacek Florek, Maciej Wyrębek, Dariusz Młyński, Andrzej Wałęga. Combined use of the hydraulic and hydrological methods to calculate the environmental flow: Wisloka river, Poland: case study. Environmental Monitoring and Assessment. 2019; 191 (4):1-17.

Chicago/Turabian Style

Leszek Książek; Agnieszka Woś; Jacek Florek; Maciej Wyrębek; Dariusz Młyński; Andrzej Wałęga. 2019. "Combined use of the hydraulic and hydrological methods to calculate the environmental flow: Wisloka river, Poland: case study." Environmental Monitoring and Assessment 191, no. 4: 1-17.

Journal article
Published: 22 March 2019 in Water
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The aim of the work was to develop a new empirical model for calculating the peak annual flows of a given frequency of occurrence (QT) in the ungauged catchments of the upper Vistula basin in Poland. The approach to the regionalization of the catchment and the selection of the optimal form of the empirical model are indicated as a novelty of the proposed research. The research was carried out on the basis of observation series of peak annual flows (Qmax) for 41 catchments. The analysis was performed in the following steps: statistical verification of data; estimation of Qmax flows using kernel density estimation; determination of physiographic and meteorological characteristics affecting the Qmax flow volume; determination of the value of dimensionless quantiles for QT flow calculation in the upper Vistula basin; verification of the determined correlation for the calculation of QT flows in the upper Vistula basin. Based on the research we conducted, we found that the following factors have the greatest impact on the formation of flood flows in the upper Vistula basin: the size of catchment area; the height difference in the catchment area; the density of the river network; the soil imperviousness index; and the volume of normal annual precipitation. The verification procedure that we performed made it possible to conclude that the developed empirical model functions correctly.

ACS Style

Dariusz Młyński; Andrzej Wałęga; Tomasz Stachura; Grzegorz Kaczor. A New Empirical Approach to Calculating Flood Frequency in Ungauged Catchments: A Case Study of the Upper Vistula Basin, Poland. Water 2019, 11, 601 .

AMA Style

Dariusz Młyński, Andrzej Wałęga, Tomasz Stachura, Grzegorz Kaczor. A New Empirical Approach to Calculating Flood Frequency in Ungauged Catchments: A Case Study of the Upper Vistula Basin, Poland. Water. 2019; 11 (3):601.

Chicago/Turabian Style

Dariusz Młyński; Andrzej Wałęga; Tomasz Stachura; Grzegorz Kaczor. 2019. "A New Empirical Approach to Calculating Flood Frequency in Ungauged Catchments: A Case Study of the Upper Vistula Basin, Poland." Water 11, no. 3: 601.

Journal article
Published: 18 February 2019 in Polish Journal of Environmental Studies
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Our paper analyzes nitrogen and phosphorus removal from sewage in a biofilter. The analysis was based on the multi-variant simulations of the combined system: fixed-film – activated sludge performance. An activated sludge ASIM 2d model related with the model of pollutions’ transformations in fixed film was used for the calculations. The results of exploitation analyses performed on the objective treatment plant – average daily rate of wastewater, pH, COD values, total suspended solids, total Kjeldahl nitrogen, nitrate nitrogen, total phosphorus, and alkalinity – were used as input parameters for the calculations. The results indicated that there is a possibility of including fixed-film in the activated sludge technology in order to improve nitrogen and phosphorus removal from the sewage. The nitrification process will be performed in fixed-film, whereas nitrogen and phosphorus removal from the sewage will be performed in anoxic chambers, which operate in the activated sludge technology. Denitrifying the dephosphatation process guarantees the high level of total phosphorus reduction (81%) and the 42% total nitrogen reduction, but only if the whole easily decomposable substrate will be consumed by microorganisms in the anoxic chamber and if enough nitrates will be present in the environment.

ACS Style

Andrzej Wałęga; Krzysztof Chmielowski; Dariusz Młyński. Nitrogen and Phosphorus Removal from Sewage in Biofilter – Activated Sludge Combined Systems. Polish Journal of Environmental Studies 2019, 28, 1939 -1947.

AMA Style

Andrzej Wałęga, Krzysztof Chmielowski, Dariusz Młyński. Nitrogen and Phosphorus Removal from Sewage in Biofilter – Activated Sludge Combined Systems. Polish Journal of Environmental Studies. 2019; 28 (3):1939-1947.

Chicago/Turabian Style

Andrzej Wałęga; Krzysztof Chmielowski; Dariusz Młyński. 2019. "Nitrogen and Phosphorus Removal from Sewage in Biofilter – Activated Sludge Combined Systems." Polish Journal of Environmental Studies 28, no. 3: 1939-1947.

Journal article
Published: 23 January 2019 in Atmosphere
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The aim of this study was to determine the best probability distributions for calculating the maximum annual daily precipitation with the specific probability of exceedance (Pmaxp%). The novelty of this study lies in using the peak-weighted root mean square error (PWRMSE), the root mean square error (RMSE), and the coefficient of determination (R2) for assessing the fit of empirical and theoretical distributions. The input data included maximum daily precipitation records collected in the years 1971–2014 at 51 rainfall stations from the Upper Vistula Basin, Southern Poland. The value of Pmaxp% was determined based on the following probability distributions of random variables: Pearson’s type III (PIII), Weibull’s (W), log-normal, generalized extreme value (GEV), and Gumbel’s (G). Our outcomes showed a lack of significant trends in the observation series of the investigated random variables for a majority of the rainfall stations in the Upper Vistula Basin. We found that the peak-weighted root mean square error (PWRMSE) method, a commonly used metric for quality assessment of rainfall-runoff models, is useful for identifying the statistical distributions of the best fit. In fact, our findings demonstrated the consistency of this approach with the RMSE goodness-of-fit metrics. We also identified the GEV distribution as recommended for calculating the maximum daily precipitation with the specific probability of exceedance in the catchments of the Upper Vistula Basin.

ACS Style

Dariusz Młyński; Andrzej Wałęga; Andrea Petroselli; Flavia Tauro; Marta Cebulska. Estimating Maximum Daily Precipitation in the Upper Vistula Basin, Poland. Atmosphere 2019, 10, 43 .

AMA Style

Dariusz Młyński, Andrzej Wałęga, Andrea Petroselli, Flavia Tauro, Marta Cebulska. Estimating Maximum Daily Precipitation in the Upper Vistula Basin, Poland. Atmosphere. 2019; 10 (2):43.

Chicago/Turabian Style

Dariusz Młyński; Andrzej Wałęga; Andrea Petroselli; Flavia Tauro; Marta Cebulska. 2019. "Estimating Maximum Daily Precipitation in the Upper Vistula Basin, Poland." Atmosphere 10, no. 2: 43.

Journal article
Published: 01 January 2019 in Journal of Ecological Engineering
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Karolina Kurek; Dariusz Młyński; Piotr Bugajski; Elwira Nowobilska-Majewska. The Impact of Treated Sewage on Water Quality in Mordarka Stream. Journal of Ecological Engineering 2019, 20, 39 -45.

AMA Style

Karolina Kurek, Dariusz Młyński, Piotr Bugajski, Elwira Nowobilska-Majewska. The Impact of Treated Sewage on Water Quality in Mordarka Stream. Journal of Ecological Engineering. 2019; 20 (1):39-45.

Chicago/Turabian Style

Karolina Kurek; Dariusz Młyński; Piotr Bugajski; Elwira Nowobilska-Majewska. 2019. "The Impact of Treated Sewage on Water Quality in Mordarka Stream." Journal of Ecological Engineering 20, no. 1: 39-45.

Journal article
Published: 01 January 2019 in Acta Scientiarum Polonorum Formatio Circumiectus
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Cel pracy: Celem pracy była weryfikacja wzorów empirycznych do wyznaczania przepływów średnich niskich (SNQ) w aspekcie szacowania zasobów dyspozycyjnych, dla wybranych zlewni górskich Polski południowej. Analizie poddano wzory empiryczne Punzeta i Stachý. Materiał i metody:...

ACS Style

Dariusz Piotr Młyński; University of Agriculture in Krakow; Andrzej Wałęga; Piotr Bugajski; Agnieszka Operacz; Karolina Kurek. VERIFICATION OF EMPIRICAL FORMULAS FOR CALCULATING MEAN LOW FLOW WITH THE VIEW TO EVALUATING AVAILABLE WATER RESOURCES. Acta Scientiarum Polonorum Formatio Circumiectus 2019, 2, 83 -92.

AMA Style

Dariusz Piotr Młyński, University of Agriculture in Krakow, Andrzej Wałęga, Piotr Bugajski, Agnieszka Operacz, Karolina Kurek. VERIFICATION OF EMPIRICAL FORMULAS FOR CALCULATING MEAN LOW FLOW WITH THE VIEW TO EVALUATING AVAILABLE WATER RESOURCES. Acta Scientiarum Polonorum Formatio Circumiectus. 2019; 2 (2):83-92.

Chicago/Turabian Style

Dariusz Piotr Młyński; University of Agriculture in Krakow; Andrzej Wałęga; Piotr Bugajski; Agnieszka Operacz; Karolina Kurek. 2019. "VERIFICATION OF EMPIRICAL FORMULAS FOR CALCULATING MEAN LOW FLOW WITH THE VIEW TO EVALUATING AVAILABLE WATER RESOURCES." Acta Scientiarum Polonorum Formatio Circumiectus 2, no. 2: 83-92.

Journal article
Published: 01 January 2019 in Acta Scientiarum Polonorum Formatio Circumiectus
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ACS Style

Dariusz Piotr Młyński; University of Agriculture in Krakow; Andrzej Wałęga; Piotr Bugajski; Agnieszka Operacz; Karolina Kurek. VERIFICATION OF EMPIRICAL FORMULAS FOR CALCULATING MEAN LOW FLOW WITH THE VIEW TO EVALUATING AVAILABLE WATER RESOURCES. Acta Scientiarum Polonorum Formatio Circumiectus 2019, 2, 83 -92.

AMA Style

Dariusz Piotr Młyński, University of Agriculture in Krakow, Andrzej Wałęga, Piotr Bugajski, Agnieszka Operacz, Karolina Kurek. VERIFICATION OF EMPIRICAL FORMULAS FOR CALCULATING MEAN LOW FLOW WITH THE VIEW TO EVALUATING AVAILABLE WATER RESOURCES. Acta Scientiarum Polonorum Formatio Circumiectus. 2019; 2 (2):83-92.

Chicago/Turabian Style

Dariusz Piotr Młyński; University of Agriculture in Krakow; Andrzej Wałęga; Piotr Bugajski; Agnieszka Operacz; Karolina Kurek. 2019. "VERIFICATION OF EMPIRICAL FORMULAS FOR CALCULATING MEAN LOW FLOW WITH THE VIEW TO EVALUATING AVAILABLE WATER RESOURCES." Acta Scientiarum Polonorum Formatio Circumiectus 2, no. 2: 83-92.