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Journal articles on the topic 'Sewer design Mathematical models'

Author: Grafiati

Published: 10 December 2022

Last updated: 31 July 2025

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1

Wittmanová, R., I. Makro, J. Hrudka, M. Šutús, and Š. Stanko. "Modelling of Stormwater runoff and Wastewater Flow in the Sewer Network." IOP Conference Series: Materials Science and Engineering 1252, no. 1 (2022): 012068. http://dx.doi.org/10.1088/1757-899x/1252/1/012068.

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Abstract The purpose of mathematical modelling of sewer networks is mainly to assess the hydraulic capacity and monitor its behaviour under different conditions to predict the future state. Sewerage network models are also part of the design process. Their advantage is the possibility of simulating the future state of the network and the precipitation and runoff process in the context of climate change. With the help of simulations, it is possible to anticipate future conditions in urban catchments and thus effectively design new networks. The aim of this paper is to summarize mathematical sim

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Duque, Natalia, Daniel Duque, Andrés Aguilar, and Juan Saldarriaga. "Sewer Network Layout Selection and Hydraulic Design Using a Mathematical Optimization Framework." Water 12, no. 12 (2020): 3337. http://dx.doi.org/10.3390/w12123337.

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This paper proposes an iterative mathematical optimization framework to solve the layout and hydraulic design problems of sewer networks. The layout selection model determines the flow rate and direction per pipe using mixed-integer programming, which results in a tree-like structured network. This network layout parametrizes a second model that determines hydraulic features including the diameter and the upstream and downstream invert elevations of pipes using a shortest path algorithm. These models are embedded in an iterative scheme that refines a cost function approximation for the first m

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Csicsaiová, R., J. Hrudka, I. Marko, and Š. Stanko. "Application of mathematical models in design and assessment of sewer network facilities." IOP Conference Series: Materials Science and Engineering 867 (October 9, 2020): 012005. http://dx.doi.org/10.1088/1757-899x/867/1/012005.

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Gall, B., D. Averill, and D. Weatherbe. "Modelling, Design and Optimization of a Combined Sewer Overflow Treatment System." Water Quality Research Journal 32, no. 1 (1997): 139–54. http://dx.doi.org/10.2166/wqrj.1997.010.

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Abstract A process modelling and simulation program is being developed as part of a pilot-scale study of satellite treatment options for the control of combined sewer overflows (CSOs). The initial objectives are (1) the development of mathematical models for satellite wastewater treatment processes; (2) the implementation of these models in a computer simulator; and 3) the application of these models to provide a preliminary design of a full-scale CSO treatment facility that will satisfy the local regulatory agency. Results to date show that the models and simulation algorithms constitute a us

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Voronov, Yuri P. "DIGITAL TERRAIN MODELS IN SIBERIAN CITIES AND UTILITY NETWORKS DESIGN." Interexpo GEO-Siberia 3, no. 1 (2021): 152–61. http://dx.doi.org/10.33764/2618-981x-2021-3-1-152-161.

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The article considers one of the important directions of innovative technologies in the urban economy, application of digital terrain models in the design, development and operation of utility networks. The author considers the five tasks of using the digital model sequentially: ) development of a digital terrain model, 2) allocation of watersheds and facies, 3) plotting contours (ridges) for all facies, 4) two-level modeling of surface runoff and storm sewer, 5) solving practical problems of determining silting zones and optimizing snow removal. The original principle proposed in the article

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Mietzel, T., K. Klepiszewski, and G. Weiss. "Development and verification of a general approach to describe the efficiency of vortex separators in combined sewer systems." Water Science and Technology 55, no. 4 (2007): 165–73. http://dx.doi.org/10.2166/wst.2007.106.

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The water framework directive (CEC, 2000) asks for cost-effective measures for achieving good ecological conditions in receiving waters. Because of low operation costs and good pollutant removal efficiency, vortex separators (VS) are an attractive alternative to traditional stormwater tanks. The German design standard for CSO structures, ATV-A 128 (1992), demands long-term pollution load simulations. Today's simulation software, however, considers the removal processes in CSO structures either very rudimentarily or not at all. The higher pollutant removal efficiency of a structure like a VS ca

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Head, P. C., D. H. Crawshaw, P. Dempsey, and C. J. Hutchings. "Bathing in the Rain - The Use of Mathematical Models for Storm Water Management to Achieve Bathing Water Quality (The Fylde Coast-NW England)." Water Science and Technology 25, no. 12 (1992): 59–68. http://dx.doi.org/10.2166/wst.1992.0337.

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One of the major problems in trying to design wastewater treatment schemes to protect bathing water for coastal communities with combined sewerage systems, is to ensure that discharges of storm water do not prejudice compliance with the requirements of the EC Bathing Water Directive. In order to develop an appropriate storm water management strategy for the Fylde coast it was necessary to integrate a number of mathematical models simulating the hydraulic behaviour of the sewerage system and the dispersion of discharges in the receiving waters. From the sewerage system modelling it was apparent

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Telyatnikova, Anna, Sviatoslav Fedorov, Iurii Stolbikhin, and Elena Korneeva. "Prediction of hydrogen sulfide emission from an energy dissipation chamber and assessment of its distribution in the ambient air." E3S Web of Conferences 140 (2019): 06001. http://dx.doi.org/10.1051/e3sconf/201914006001.

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Wastewater transport in sewer networks contributes to the formation and emission of fetid and toxic sewage gases into the environment, one of which is hydrogen sulfide. The emission of gases can have a significant impact on the environment and health of maintenance workers and city residents. The object of the research is the study of the process of hydrogen sulfide emission in the energy dissipation chamber (EDC). The method of two-stage mathematical modeling in the program of finite element analysis ANSYS CFX is applied for the research. Two models have been created, the first one simulates

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Abdulmazhidov, Kh A. "Dependence of the performance of the reclaiming sewer cleaner with rigid guides from interchangeable bucket tools capabilities." Vegetable crops of Russia, no. 6 (December 10, 2022): 125–29. http://dx.doi.org/10.18619/2072-9146-2022-6-125-129.

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Relevance. Cleaning of reclamation channels is a very relevant event. The need to clean the canals and maintain them in working condition becomes obvious during the flood period, when it is necessary to remove excess water. The paper presents mathematical models for determining the performance of the PP-303 canal cleaner, a feature of which is the rectilinear movement of the bucket on rigid guides along the bottom along the axis of the canal to be cleaned.Methods. The article is formed on the basis of experimental research methods. The research was carried out based on experimental and calcula

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Dean, Justin, Evan Goldberg, and Franziska Michor. "Designing optimal allocations for cancer screening using queuing network models." PLOS Computational Biology 18, no. 5 (2022): e1010179. http://dx.doi.org/10.1371/journal.pcbi.1010179.

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Cancer is one of the leading causes of death, but mortality can be reduced by detecting tumors earlier so that treatment is initiated at a less aggressive stage. The tradeoff between costs associated with screening and its benefit makes the decision of whom to screen and when a challenge. To enable comparisons across screening strategies for any cancer type, we demonstrate a mathematical modeling platform based on the theory of queuing networks designed for quantifying the benefits of screening strategies. Our methodology can be used to design optimal screening protocols and to estimate their

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Plósz, Benedek Gy, Helge Liltved, and Harsha Ratnaweera. "Climate change impacts on activated sludge wastewater treatment: a case study from Norway." Water Science and Technology 60, no. 2 (2009): 533–41. http://dx.doi.org/10.2166/wst.2009.386.

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We present an investigation on climate change effects on a wastewater treatment system that receive sewage collected in a combined sewer system in Oslo, Norway, during winter operation. Results obtained, by contrasting meteorological data with sewage data, show that wastewater treatment plant (WWTP) influent flow rates are significantly increased during temporary snow melting periods above a critical daily air mean temperature of approx. −1.5°C degree (TCrit) identified in the area. In order to assess melting patterns, the number of days above and below TCrit was assessed, and the annual numbe

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Head, P. C., D. H. Crawshaw, and S. K. Rasaratnam. "Fylde Coast Bathing Water Improvements – Storm Water Management for Compliance with Bathing Water Directive." Water Science and Technology 22, no. 10-11 (1990): 223–30. http://dx.doi.org/10.2166/wst.1990.0308.

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As part of the investigations to determine the most appropriate scheme to bring the Fylde Coast bathing waters up to the quality required by the EC Bathing Water Directive, mathematical models have been used to examine the hydraulic behaviour of the sewerage system and the subsequent dispersion of effluent in the receiving waters. The discharge characteristics of the existing sewerage systems were examined by means of an extensive WASSP model, validated by means of flow measurements gathered from critical points of the sewer network. This model was then used, in conjunction with a time series

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Rodríguez, J. P., S. Achleitner, M. Möderl, et al. "Sediment and pollutant load modelling using an integrated urban drainage modelling toolbox: an application of City Drain." Water Science and Technology 61, no. 9 (2010): 2273–82. http://dx.doi.org/10.2166/wst.2010.139.

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Numerical and computational modelling of flow and pollutant dynamics in urban drainage systems is becoming more and more integral to planning and design. The main aim of integrated flow and pollutant models is to quantify the efficiency of different measures at reducing the amount of pollutants discharged into receiving water bodies and minimise the consequent negative water quality impact. The open source toolbox CITY DRAIN developed in the Matlab/Simulink© environment, which was designed for integrated modelling of urban drainage systems, is used in this work. The goal in this study was to i

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Mourato, S., J. Matos, M. Almeida, and T. Hvitved-Jacobsen. "Modelling in-sewer pollutant degradation processes in the Costa do Estoril sewer system." Water Science and Technology 47, no. 4 (2003): 93–100. http://dx.doi.org/10.2166/wst.2003.0229.

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Characteristics of wastewater vary during transportation through sewer systems as a result of a number of processes. Under aerobic conditions, in long sewer systems, the reduction of the BOD or COD may be similar to the reduction obtained in conventional primary settling tanks. The mathematical model that was developed is based on a number of different existing models: the ASM n. 1 and ASM n. 2 models, the AEROSEPT model and the WATS model. The model also includes a prediction of reaeration at falls. The module of the anoxic conditions was adapted from the ASM n. 2 model. This module is a firs

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Kutzner, R., H. Brombach, and W. F. Geiger. "Sewer solids separation by sedimentation – the problem of modeling, validation and transferability." Water Science and Technology 55, no. 4 (2007): 113–23. http://dx.doi.org/10.2166/wst.2007.101.

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Sedimentation of sewer solids in tanks, ponds and similar devices is the most relevant process for the treatment of stormwater and combined sewer overflows in urban collecting systems. In the past a lot of research work was done to develop deterministic models for the description of this separation process. But these modern models are not commonly accepted in Germany until today. Water Authorities are sceptical with regard to model validation and transferability. Within this paper it is checked whether this scepticism is reasonable. A framework-proposal for the validation of mathematical model

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Marsalek, J., T. O. Barnwell, W. Geiger, et al. "Urban Drainage Systems: Design and Operation." Water Science and Technology 27, no. 12 (1993): 31–70. http://dx.doi.org/10.2166/wst.1993.0291.

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Design and operation of urban drainage systems are addressed in the context of the urban water system comprising drainage, sewage treatment plants and receiving waters. The planning and design of storm sewers are reviewed with reference to planning objectives, design objectives, flows and pollutant loads, sewer system structures and urban runoff control and treatment. The discussion of combined sewers focuses on hydraulic design of combined sewer systems, including combined sewer overflow (CSO) structures, and the use of CSO structures and storage in control of CSOs. The section on operation o

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Kalinin, Anatoliy Vladimirovich. "CALCULATION OF FRICTION LOSSES COEFFICIENT IN COMBINED SEWER PIPS." Urban construction and architecture 4, no. 1 (2014): 58–61. http://dx.doi.org/10.17673/vestnik.2014.01.10.

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A result of experimental studies of coeffi cient of hydraulic friction on depending on the form of bott om microrelief is submitt ed. The comparative analysis of calculation of friction losses coeffi cient with the results of measurements made in the combined sewer pips in France is given. Further research in this area will improve the existing mathematical models of water movement in the storm sewer networks.

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18

Ayub, Nabende, Twaibu Semwogerere, and Richard O. Awichi. "Mathematical Modelling of Sewage Overflow Through Pipe-Manhole Drainage Sewer Systems Using CFD: A Case of Mbale City, Eastern Uganda." East African Journal of Engineering 2, no. 1 (2020): 33–45. http://dx.doi.org/10.37284/eaje.2.1.239.

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The major objective of this study was to design a model to optimize sewage flow through pipe-manhole drainage systems using Computational Fluid Dynamics (CFD). Multi-phase flows like two-phase flow in transport pipes is a common occurrence in many industrial applications such as sewage, water, oil, gas transportation and power generation. Accurate prediction of fluid velocity and pressure drop is of utmost importance to ensure effective design and operation of fluid transport systems. Numerical simulations were performed at different pipe inclinations and fluid flow velocities. A two-dimension

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Verbanck, Michel A. "Assessment of sediment behaviour in a cunette-shaped sewer section." Water Science and Technology 33, no. 9 (1996): 49–59. http://dx.doi.org/10.2166/wst.1996.0174.

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The accumulation of deposits in sewers causes widespread concerns of either operational or environmental nature. It is believed that a number of sediment-related nuisances can substantially be controlled in adapting the characteristics of sewer pipes as a function of local constraints and circumstances. In particular, key design parameters such as cross-section shape or hydraulic roughness of inner walls are currently selected basing more on empiricism and intuition than on full knowledge of the sediment transport driving processes. A valid track for optimization of these parameters is to run

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Kleijwegt, Rob A. "On the Prediction of Sediment Transport in Sewers with Deposits." Water Science and Technology 27, no. 5-6 (1993): 69–80. http://dx.doi.org/10.2166/wst.1993.0487.

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There is a need for models to predict the negative effects of sewer deposits in order to improve design, maintenance and operation of sewerage systems. The lack of success of deterministic sewer sediment models in the past is caused by a lack of basic knowledge, which causes unknown uncertainties in the model's results. The basic knowledge about non-cohesive sediment transport has been studied with laboratory experiments. This has resulted in an understanding of the non-cohesive sewer sediment transport and the related subjects of bed shear stress, incipient motion, bed forms and flow resistan

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Hansen, O. B., C. Jacobsen, P. Harremoës, and P. Skat Nielsen. "Stormwater Loading of Greater Copenhagen Sewage Treatment Plants." Water Science and Technology 27, no. 5-6 (1993): 49–59. http://dx.doi.org/10.2166/wst.1993.0485.

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The study presented in this paper deals with the computation of the increased hydraulic loading of the treatment plants in the Greater Copenhagen area due to the installation of more storage capacity in the combined sewer system in the future. A mathematical model is set up for the entire sewer catchment and predictions of future increased hydraulic loadings are made for various development scenarios. The computed inflow conditions are presented on a statistical form. The results show a significant increase in the hydraulic loading of the plants due to increased storage volume in the sewer sys

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Lebreton, J. D., and K. H. Pollock. "Methodological advances." Animal Biodiversity and Conservation 27, no. 1 (2004): 147–48. http://dx.doi.org/10.32800/abc.2004.27.0147.

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The study of population dynamics has long depended on methodological progress. Among many striking examples, continuous time models for populations structured in age (Sharpe & Lotka, 1911) were made possible by progress in the mathematics of integral equations. Therefore the relationship between population ecology and mathematical and statistical modelling in the broad sense raises a challenge in interdisciplinary research. After the impetus given in particular by Seber (1982), the regular biennial EURING conferences became a major vehicle to achieve this goal. It is thus not surprising th

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Fronteau, C., W. Bauwens, and P. A. Vanrolleghem. "Integrated modelling: comparison of state variables, processes and parameters in sewer and wastewater treatment plant models." Water Science and Technology 36, no. 5 (1997): 373–80. http://dx.doi.org/10.2166/wst.1997.0235.

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All the parts of an urban drainage system, i.e. the sewer system, the wastewater treatment plant (WWTP) and the river, should be integrated into one single model to assess the performance of the overall system and for the development of design and control strategies assisting in its sustainable and cost effective management. Existing models for the individual components of the system have to be merged in order to develop the integrated tool. One of the problems arising from this methodology is the incompatibility of state variables, processes and parameters used in the different modelling appr

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Stirrup, M., Z. Vitasovic, and E. Strand. "Real-Time Control of Combined Sewer Overflows in Hamilton-Wentworth Region." Water Quality Research Journal 32, no. 1 (1997): 155–68. http://dx.doi.org/10.2166/wqrj.1997.011.

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Abstract The Regional Municipality of Hamilton-Wentworth operates and maintains a large combined sewer system in the Great Lakes basin. During dry weather and small storm events, two large interceptor sewers convey all sanitary and storm flows to the Woodward Avenue wastewater treatment plant. Larger rainfall events, specifically high intensity summer thunderstorms, generate flows which exceed the design capacity of the sanitary interceptors and result in combined sewer overflows to Hamilton Harbour and Cootes Paradise, which ultimately discharge to Lake Ontario. The Region is implementing a c

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Goncharenko, Dmitriy, Ihor Shumakov, Olha Starkova, Alevtyna Aleinikova, and Revaz Mikautadze. "Methodological and computer-based support for choosing underground utility networks renovation method." MATEC Web of Conferences 230 (2018): 02010. http://dx.doi.org/10.1051/matecconf/201823002010.

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The article is devoted to the methodological and software tools for choosing organizational and technological solutions to maintain sewage collectors in an operable state to increase their service life. Such a tool must take into account a set of factors that affect the operation of sewer collectors and form a system, the implementation of which would improve the existing principles of monitoring the status of sewer collectors, identify effective organization and technological solutions of their renovation by taking into account factors that affect their safe operation, the facilities risk of

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Ahyerre, M., G. Chebbo, B. Tassin, and E. Gaume. "Storm water quality modelling, an ambitious objective?" Water Science and Technology 37, no. 1 (1998): 205–13. http://dx.doi.org/10.2166/wst.1998.0050.

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As a consequence of the awareness of the pollution impact of storm sewer overflows, managers need tools to evaluate and control stormwaters according to water quality criteria. After an experience of 25 years in storm water quality modelling, very few models are widely and regularly used. According to managers this is due to their cost and their low level of accuracy. The generation and the transport of the pollution in urban systems during a storm event are very complex because they concern many media and many space and time scales. Nevertheless, a typology of the existing models shows that t

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THOMPSON, G. "Mathematical Models and Engineering Design." Water and Environment Journal 7, no. 1 (1993): 18–23. http://dx.doi.org/10.1111/j.1747-6593.1993.tb00805.x.

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Huang, Chung-Fu, Wei-Ting Chen, Chuan-Ksing Kao, Han-Jung Chang, Po-Min Kao, and Terng-Jou Wan. "Application of Fuzzy Multi-Objective Programming to Regional Sewer System Planning." Processes 11, no. 1 (2023): 183. http://dx.doi.org/10.3390/pr11010183.

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Planning of sewer systems typically involves limitations and problems, regardless of whether traditional planning methods or optimization models are used. Such problems include non-quantifiability, fuzzy objectives, and uncertainties in decision-making variables which are commonly applied in the planning of any process. Particularly, uncertainties have prevented the inclusion of these variables in models. Consequently, the theoretical optional solution of the mathematical models is not the true optimum solution to practical problems. In this study, to solve the above problems for regional sewe

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Primin, Oleg, Andrey Ten, and Daria Khudyakova. "Hydraulic calculations of storm sewer networks." E3S Web of Conferences 163 (2020): 03012. http://dx.doi.org/10.1051/e3sconf/202016303012.

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Surface run-off (SR) produced on the territory of cities and other settlement as a result of atmospheric precipitation is an intensive source of the technogenic pollution of environment, including the waterbodies. In accordance with the existing legislation of the Russian Federation, SR requires organized disposal and treatment according to the standards of regulatory documents. In this article we analyze the European document BS EN 752:2017 with regard to determining the flow-rates of surface (storm-water) run-off, and the calculations are made by the authors, which demonstrate that the appli

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Mair, M., R. Sitzenfrei, M. Kleidorfer, M. Möderl, and W. Rauch. "GIS-based applications of sensitivity analysis for sewer models." Water Science and Technology 65, no. 7 (2012): 1215–22. http://dx.doi.org/10.2166/wst.2012.954.

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Sensitivity analysis (SA) evaluates the impact of changes in model parameters on model predictions. Such an analysis is commonly used when developing or applying environmental models to improve the understanding of underlying system behaviours and the impact and interactions of model parameters. The novelty of this paper is a geo-referenced visualization of sensitivity indices for model parameters in a combined sewer model using geographic information system (GIS) software. The result is a collection of maps for each analysis, where sensitivity indices (calculated for model parameters of inter

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Alfaisal, Faisal M., and Larry W. Mays. "Optimization Models for Layout and Pipe Design for Storm Sewer Systems." Water Resources Management 35, no. 14 (2021): 4841–54. http://dx.doi.org/10.1007/s11269-021-02958-5.

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Jung, Daniel, Laetitia Hatrait, Julien Gouello, Arnaud Ponthieux, Vincent Parez, and Christophe Renner. "Emission of hydrogen sulfide (H2S) at a waterfall in a sewer: study of main factors affecting H2S emission and modeling approaches." Water Science and Technology 76, no. 10 (2017): 2753–63. http://dx.doi.org/10.2166/wst.2017.428.

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Abstract Hydrogen sulfide (H2S) represents one of the main odorant gases emitted from sewer networks. A mathematical model can be a fast and low-cost tool for estimating its emission. This study investigates two approaches to modeling H2S gas transfer at a waterfall in a discharge manhole. The first approach is based on an adaptation of oxygen models for H2S emission at a waterfall and the second consists of a new model. An experimental set-up and a statistical data analysis allowed the main factors affecting H2S emission to be studied. A new model of the emission kinetics was developed using

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Huber, Franz, Georg Neugebauer, Thomas Ertl, and Florian Kretschmer. "Suitability Pre-Assessment of in-Sewer Heat Recovery Sites Combining Energy and Wastewater Perspectives." Energies 13, no. 24 (2020): 6680. http://dx.doi.org/10.3390/en13246680.

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In many countries around the world heating (and cooling) has been and will remain the biggest energy sector, but it is still widely dominated by fossil energy sources today. Wastewater as a source of renewable energy contains large amounts of heat and due to its place-bound localization in urban sewer systems it is usually also situated in very close distance to potential heat consumers. However, one has to keep in mind that heat extraction from wastewater might have undesired impacts on temperature-sensitive treatment processes in the related wastewater treatment plant (WWTP). To assess the p

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Michelbach, S., G. Weiß, and H. Brombach. "CSO-MASTERPLAN FOR THE CITY OF WALDENBURG, GERMANY." Water Science and Technology 30, no. 1 (1994): 43–52. http://dx.doi.org/10.2166/wst.1994.0005.

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The small town of Waldenburg in South Germany planned to continue the implementation of stormwater treatment. The CSO-Masterplan dated from the year 1976. Meanwhile, new guidelines were issued and new technologies became available, like mathematical sewer models. Since the ecological impact of stormwater treatment is today much more accounted for, it was decided to revise the CSO-Masterplan. The goal was to find a solution with minimized ecological impact at low costs. This urban hydrological study featured some unusual approaches. First, the present state of city, sewer system, treatment plan

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Capodaglio, Andrea G. "INTEGRAL CONTROL REQUIREMENTS FOR SEWERAGE SYSTEMS." Water Science and Technology 30, no. 1 (1994): 131–38. http://dx.doi.org/10.2166/wst.1994.0014.

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Sewerage systems and sewage treatment plants are often planned, designed and operated as totally separate entities. As a result, sewage treatment efficiency is subject to considerable variability, depending both on general hydrologic conditions in the urban watershed (wet versus dry periods), and on specific “instantaneous” operating conditions. It has been postulated that the integration of design and operation in urban drainage and wastewater treatment could allow minimization of the harmful effects of discharges from treatment plants, combined sewer overflows and surface runoff. This “ideal

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Han, Li. "Mathematical Models for Logical Design Methodology." International Journal of Design Education 16, no. 1 (2021): 105–15. http://dx.doi.org/10.18848/2325-128x/cgp/v16i01/105-115.

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Han, Li. "Mathematical Models for Logical Design Methodology." International Journal of Design Education 16, no. 1 (2021): 105–15. http://dx.doi.org/10.18848/2325-128x/cgp/v16i01/105-115.

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Mukhacheva, Elita A., and Tatiana A. Panyukova. "Mathematical Models of Cutting Process Design." IFAC Proceedings Volumes 42, no. 4 (2009): 1085–90. http://dx.doi.org/10.3182/20090603-3-ru-2001.0338.

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Seco, I., M. Gómez Valentín, A. Schellart, and S. Tait. "Erosion resistance and behaviour of highly organic in-sewer sediment." Water Science and Technology 69, no. 3 (2013): 672–79. http://dx.doi.org/10.2166/wst.2013.761.

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Reliable prediction of time-varying pollutant loads in combined sewer systems during storm periods can aid better management of the release of pollution into natural environments as well as enhancing storage tank design. Better understanding of the behaviour of sewer sediments is crucial for the development of models that adequately describe the transport of in-sewer solids and accurately predict the changes in pollutant concentration within combined sewers during storm events. This paper reports on the results of a test programme to examine the erosion of highly organic sewer sediment under t

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Yu, Zifeng, Xianfeng Li, and Lianpeng Sun. "A transformer cascaded model for defect detection of sewer pipes based on confusion matrix." Measurement Science and Technology 35, no. 11 (2024): 115410. http://dx.doi.org/10.1088/1361-6501/ad6f35.

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Abstract Urban sewerage systems are critical to urban infrastructure. However, they are often subject to defects that threaten their operational reliability and efficiency. Some different types of sewer defects often have similar features. Recently, a number of deep learning models have emerged to automatically identify sewer failures, but these models often fail to accurately distinguish between them. In this paper, we propose a cascaded model to address this problem. Our work is based on the confusion matrix, which is obtained from a baseline model. With the confusion matrix, we can group co

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Safari, Mir Jafar Sadegh, Akbar Shirzad, and Mirali Mohammadi. "Sediment transport modeling in deposited bed sewers: unified form of May's equations using the particle swarm optimization algorithm." Water Science and Technology 76, no. 4 (2017): 992–1000. http://dx.doi.org/10.2166/wst.2017.267.

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May proposed two dimensionless parameters of transport (η) and mobility (Fs) for self-cleansing design of sewers with deposited bed condition. The relationships between those two parameters were introduced in conditional form for specific ranges of Fs, which makes it difficult to use as a practical tool for sewer design. In this study, using the same experimental data used by May and employing the particle swarm optimization algorithm, a unified equation is recommended based on η and Fs. The developed model is compared with original May relationships as well as corresponding models available i

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Revilla, José A., Kalin N. Koev, Rafael Díaz, César Álvarez, and Antonio Roldán. "Methods for studying dissolved oxygen levels in coastal and estuarine waters receiving combined sewer overflows." Water Science and Technology 32, no. 2 (1995): 95–103. http://dx.doi.org/10.2166/wst.1995.0081.

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One factor in determining the transport capacity of coastal interceptors in Combined Sewer Systems (CSS) is the reduction of Dissolved Oxygen (DO) in coastal waters originating from the overflows. The study of the evolution of DO in coastal zones is complex. The high computational cost of using mathematical models discriminates against the required probabilistic analysis being undertaken. Alternative methods, based on such mathematical modelling, employed in a limited number of cases, are therefore needed. In this paper two alternative methods are presented for the study of oxygen deficit resu

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Moelants, N., I. Y. Smets, R. Van Den Broeck, et al. "Towards a low complexity carbon removal model for the optimal design of compact decentralised wastewater treatment systems." Water Science and Technology 61, no. 6 (2010): 1579–88. http://dx.doi.org/10.2166/wst.2010.099.

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On-site decentralised wastewater treatment systems can provide a financially attractive alternative to a sewer connection in locations far from existing sewer networks. Operational problems and shortcomings in the design of these systems still occur frequently. The aim of this paper is to provide a low complexity (i.e. easy to calibrate) but still accurate mathematical model that can be used to optimise the operational design of compact individual wastewater treatment systems. An integrated hydraulic and biological carbon removal model of a biofilm-based compact decentralised treatment system

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Alfakih, E., S. Barraud, and I. Martinelli. "A study of stormwater infiltration system feasibility and design." Water Science and Technology 39, no. 2 (1999): 225–31. http://dx.doi.org/10.2166/wst.1999.0122.

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There are numerous reasons, such the saturation of the existing downstream sewer system or its concentrate discharge impact on the receiving water, for using stormwater infiltration systems. However, their feasibility within an urban development project depends on physical soil characteristics and contamination risk, and also on socio-economic considerations. The choice should be based on multiple comparative evaluations. This paper is an overview of feasibility and decision criteria, taking stock of currently available models and approaches.

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Kalyakulin, S. Yu, E. V. Mitin, and S. P. Sul’din. "Classification of Mathematical Models for Process Design." Russian Engineering Research 41, no. 11 (2021): 1045–48. http://dx.doi.org/10.3103/s1068798x21110137.

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Staribratov, Ivaylo, and Nikol Manolova. "Application of Mathematical Models in Graphic Design." Mathematics and Informatics LXV, no. 1 (2022): 72–81. http://dx.doi.org/10.53656/math2022-1-5-app.

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The article shares the practical experience in creating graphic design in the implementation of projects in the field of applied information technology. The creation of digital art is largely based on mathematical models and concepts that give a good perception of graphics, and it is scientifically justified. The STEAM approach is considered with the idea of the transdisciplinary level of integration between mathematics, graphic design and production practice in student education. For the development of projects like logo design, magazine cover and others, we use software specialized in the fi

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Sonderman, David, and Philip G. Abrahamson. "Radiotherapy Treatment Design Using Mathematical Programming Models." Operations Research 33, no. 4 (1985): 705–25. http://dx.doi.org/10.1287/opre.33.4.705.

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Khan, Faisal I., and S. A. Abbasi. "Effective design of greenbelts using mathematical models." Journal of Hazardous Materials 81, no. 1-2 (2001): 33–65. http://dx.doi.org/10.1016/s0304-3894(00)00288-0.

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Gupta, Kapil, and Adrian J. Saul. "Suspended solids in combined sewer flows." Water Science and Technology 33, no. 9 (1996): 93–99. http://dx.doi.org/10.2166/wst.1996.0185.

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Many studies have identified the first flush phenomenon as being the relatively high concentration of pollutants in the initial phases of combined sewer flow following a storm. One way of controlling the first flush is by the provision of a storage tank such that the effluent can be discharged in a controlled manner. To optimise the storage volume, both the total pollutant load discharged and the temporal variation in pollutant concentration within an event need to be predicted. Sophisticated models to predict the pollutant concentrations in urban sewer flows, for example QSIM and MOUSETRAP ar

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Kleidorfer, Manfred, Robert Sitzenfrei, and Wolfgang Rauch. "Simplifying impact of urban development on sewer systems." Water Science and Technology 70, no. 11 (2014): 1808–16. http://dx.doi.org/10.2166/wst.2014.324.

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Linking urban development and urban drainage models is a more and more popular approach when impacts of pavement of urban areas on sewer system performance are evaluated. As such an approach is a difficult task, this is not a feasible procedure for everyday engineering practice. We propose an alternative method, based on a developed simple near-quadratic relationship, which directly translates change (increase or decrease) of paved area into a change in the return period (RP) of the design rainfall event or design rainfall intensity. This formula is simple to use and compatible with existing d

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