scholarly journals Applying micro-genetic algorithm in the one-dimensional unsteady hydraulic model for parameter optimization

2013 ◽  
Vol 16 (4) ◽  
pp. 772-783 ◽  
Author(s):  
Tsun-Hua Yang ◽  
Yu-Chi Wang ◽  
Shun-Chung Tsung ◽  
Wen-Dar Guo
Keyword(s):  
Evaluation Criteria ◽  
Hydraulic Modeling ◽  
Hydraulic Model ◽  
Roughness Coefficient ◽  
Limited Information ◽  
Good Tool ◽  
Physical Conditions ◽  
The One ◽  
Flow Quantity ◽  
River Meandering

Selection of an appropriate value for Manning's roughness coefficient could significantly impact the accuracy of a hydraulic model. However, it is highly variable and depends on flow circumstances, such as water stage and flow quantity; a stream's geomorphology, such as the fluvial process and river meandering; and physical conditions, such as the channel surface roughness and irregularities. Nevertheless, choosing proper roughness coefficients is not easy, especially with limited information and time in a practical application. Even it is done for a specific event it may not apply to another event due to its time- and site-dependency. This study proposes a Visual Basic (VB)-based system, which integrates the HEC-RAS modeling tool and the μGA to efficiently search for Manning's roughness coefficients. The matching coefficients will thereafter improve the accuracy of hydraulic modeling. Two events in the Yilan River Basin were applied to test the feasibility of the system and four evaluation criteria were used to evaluate the system performance. The results showed that μGA efficiently converged and the hydraulic model showed good agreement in comparison with the measured data. The system can be used as a good tool for finding onsite Manning's roughness coefficients in hydraulic modeling when detailed information is not available.

scholarly journals Pursuing the SDG11 Targets: The Role of the Sustainability Protocols

2021 ◽  
Vol 13 (7) ◽  
pp. 3858
Author(s):  
Francesca Abastante ◽  
Isabella M. Lami ◽  
Marika Gaballo
Keyword(s):  
Direct Relationship ◽  
Evaluation Criteria ◽  
Assessment Tools ◽  
Social Aspects ◽  
Sustainable Cities ◽  
Sustainable Development Goal ◽  
The Social ◽  
Research Questions ◽  
The One

This paper is built on the following research questions: (i) What are the direct/indirect relationships between Sustainable Development Goal 11 (SDG11) and sustainability protocols? (ii) Could the sustainability protocols constitute a solution towards the achievement of SDG11? We underline that, on the one hand, the SDGs are guidelines to support the development of sustainable policies and thus address all elements that may affect them, and on the other hand, sustainability protocols are assessment tools to promote sustainability-conscious design while remaining focused on the built environment. In the Italian regulatory context, the paper highlights how this difference in terms of focus and scale means that they only overlap and mutually reinforce each other with regard to certain aspects, more related to energy and air pollution issues and less to the social aspects of sustainability. Even if there is not always a direct relationship between the evaluation criteria of the protocols and the indicators of SDG11, it is possible to conclude that the sustainability protocols can facilitate the achievement of the SDG11 targets, acting as a key for the implementation of sustainable cities and helping in structuring the process leading to sustainability in a broader framework.

scholarly journals Hydraulic modeling of combined sewers overflow integrating the results of the SWMM and CFX models.

2021 ◽  
Vol 37 (1) ◽  
Author(s):  
D. Pulgarín ◽  
J. Plaza ◽  
J. Ruge ◽  
J. Rojas
Keyword(s):  
Three Dimensional ◽  
Hydraulic Modeling ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
One Dimensional ◽  
Ansys Cfx ◽  
Combined Sewer ◽  
The One ◽  
Swmm Model

This study proposes a methodology for the calibration of combined sewer overflow (CSO), incorporating the results of the three-dimensional ANSYS CFX model in the SWMM one-dimensional model. The procedure consists of constructing calibration curves in ANSYS CFX that relate the input flow to the CSO with the overflow, to then incorporate them into the SWMM model. The results obtained show that the behavior of the flow over the crest of the overflow weir varies in space and time. Therefore, the flow of entry to the CSO and the flow of excesses maintain a non-linear relationship, contrary to the results obtained in the one-dimensional model. However, the uncertainty associated with the idealization of flow methodologies in one dimension is reduced under the SWMM model with kinematic wave conditions and simulating CSO from curves obtained in ANSYS CFX. The result obtained facilitates the calibration of combined sewer networks for permanent or non-permanent flow conditions, by means of the construction of curves in a three-dimensional model, especially when the information collected in situ is limited.

Disinfection By-Products (DBPs) in Drinking Water from Eight Systems Using Chlorine Dioxide

2008 ◽  
Vol 43 (1) ◽  
pp. 11-22 ◽  
Author(s):  
Rocio Aranda Rodriguez ◽  
Boniface Koudjonou ◽  
Brian Jay ◽  
Guy L. LeBel ◽  
Frank M. Benoit
Keyword(s):  
Drinking Water ◽  
Chlorine Dioxide ◽  
Distribution System ◽  
Cold Water ◽  
Spatial Variations ◽  
Water Disinfection ◽  
Limited Information ◽  
Disinfection Process ◽  
The One ◽  
By Products

Abstract A study was initiated to determine the presence of organic disinfection by-products (DBPs) in drinking water treated with chlorine dioxide (ClO2). One potential advantage for the use of ClO2 as a disinfectant is the reduced formation of organic DBPs. Generally, water treated with ClO2 produces chlorite and chlorate ions, but there is limited information regarding the presence of halogenated organic DBPs. Eight systems that use chlorine dioxide as part of the water disinfection process were investigated. All systems in this study applied chlorine as a primary or secondary disinfectant in addition to ClO2. To evaluate seasonal and spatial variations, water samples were collected during cold water (February to March 2003) and warm water (July to August 2003) months at five sites for each system: raw water (R, before treatment), treated water (T, after treatment but before distribution), and three points along the same distribution line (D1, D2, D3). Sampling and analysis were conducted according to established protocols. A suite of 27 organic DBPs including haloacetic acids (HAA), trihalomethanes (THM), haloacetonitriles (HAN), haloketones, haloacetaldehydes (HA), chloropicrin, and cyanogen chloride were examined. In addition, the concentration of oxyhalides (chlorite and chlorate ions) and auxiliary parameters were also determined. Chlorite was found in treated (T) and distributed (Dx) waters. The chlorite ion levels decreased along the distribution system (T > D1 > D2 > D3). At T sites, the levels ranged from 10 to 870 µg/L (winter), and from 300 to 1,600 µg/L (summer). Chlorite was not found in treated or distributed water in the one system that used ozone. Chlorate ion levels ranged from 20 to 310 µg/L (winter), and 80 to 318 µg/L (summer). Chlorate levels remained relatively constant throughout the distribution system. THM and eight HAA (HAA8) accounted for approximately 85% of the total DBPs (wt/wt) analyzed, followed by total HA (up to 7%) and HAN (3%). THM in distributed water were found at concentrations between 1.8 and 30.6 µg/L (winter), and 3.3 and 93.6 µg/L (summer). For HAA8, the levels ranged from 13 to 52 µg/L (winter), and 16 to 111 µg/L (summer). Chloral hydrate ranged from 0.2 to 5.2 µg/L (winter), and 0.4 to 12.2 µg/L (summer). The temporal and spatial variations observed in previous studies were confirmed in the current study as well.

scholarly journals Manning’s roughness coefficient for the Doce River

RBRH ◽  
2018 ◽  
Vol 23 (0) ◽  
Author(s):  
Emmanuel Kennedy da Costa Teixeira ◽  
Márcia Maria Lara Pinto Coelho ◽  
Eber José de Andrade Pinto ◽  
Jéssica Guimarães Diniz ◽  
Aloysio Portugal Maia Saliba
Keyword(s):  
River Flow ◽  
Hydraulic Modeling ◽  
Roughness Coefficient ◽  
Local Approach ◽  
Water Courses ◽  
Time Variations ◽  
The Subject ◽  
Manning’S Roughness Coefficient ◽  
Doce River ◽  
Water Depths

ABSTRACT The Manning’s roughness coefficient is used for various hydraulic modeling. However, the decision on what value to adopt is a complex task, especially when dealing with natural water courses due to the various factors that affect this coefficient. For this reason, most of the studies carried out on the subject adopt a local approach, such as this proposal for the Doce River. Due to the regional importance of this river in Brazil, the objective of this article was to estimate the roughness coefficient of Manning along the river, in order to aid in hydraulic simulations, as well as to discuss the uncertainties and variations associated with this value. For this purpose, information on flow rates and water depths were collected at river flow stations along the river. With this information, the coefficients were calculated using the Manning equation, using the software Canal, and their space-time variations were observed. In addition, it was observed that the uncertainties in flow and depth measurements affect the value of the Manning coefficient in the case studied.

scholarly journals Flood maps and their potential role in local spatial planning: a case study from Slovakia

Water Policy ◽  
2018 ◽  
Vol 20 (5) ◽  
pp. 1042-1058 ◽  
Author(s):  
Matej Vojtek ◽  
Jana Vojteková
Keyword(s):  
Land Use ◽  
Spatial Planning ◽  
Local Development ◽  
Hydraulic Modeling ◽  
Acceptable Risk ◽  
Gis And Remote Sensing ◽  
Remote Sensing Techniques ◽  
The One ◽  
Flood Maps

Abstract The article is focused on the creation of flood maps for ungauged basins (i.e. local spatial scale areas), using a hydrologic-hydraulic approach, geographic information systems (GIS) and remote sensing techniques, and their role in local spatial planning. The case study is represented by the Turniansky potok catchment which was not mapped in the preliminary flood risk assessment (EU Floods Directive) as an area with existing potential risk. The design discharges were estimated by applying the regional formula. The design discharge with 100-year return period was chosen for hydraulic modeling using the one-dimensional HEC-RAS model. The basis for creating the flood vulnerability map for the selected hydraulic domain was the current land use. Each land use category was assigned a category of acceptable risk (low, medium, high). Furthermore, the vulnerability was defined by digitizing buildings within the hydraulic domain. The role of the created flood maps, as regulatory tools in local spatial planning (i.e. local development plan of municipality), was highlighted and discussed. The importance of flood maps is primarily seen in limiting the irresponsible expansion and densification of construction in the areas near the watercourse which were assigned the low acceptable risk.

Goods

2018 ◽  
Author(s):  
Emanuele Coccia
Keyword(s):  
Political Life ◽  
Ethical Life ◽  
Legal Tradition ◽  
New Politics ◽  
Physical Conditions ◽  
To Come ◽  
The One

Objects are all around us—and images of objects, advertisements for objects. Things are no longer merely purely physical or economic entities: within the visual economy of advertising, they are inescapably moral. Any object, regardless of its nature, can for at least a moment aspire to be “good,” can become not only an object of value but also a complex of possible happiness, a moral source of perfection for any one of us. This book argues that our relation to things is what makes us human. It shows how objects become the medium through which a city enunciates its ethos, making an ethical life available to those who live among them. Humans have revealed themselves as organisms that are ethically inseparable from the very things they produce, exchange, and desire. The alienation commodities cause and express is moral rather than economic or social; we need our own products not just to survive biologically or to improve the physical conditions of our existence, but to live morally. Ultimately, this book offers a rethinking of the power of images. Through images, we already live another form of political life, which has very little to do with the one invented and formalized by the legal tradition. All we need to do is to recognize it. Advertising and fashion are just the primitive, sometimes grotesque, but ultimately irrepressible prefiguration of the new politics to come.

Reconstructing a hydraulic model for historic flood levels in the city of Bath, United Kingdom

2020 ◽  
Author(s):  
Ioanna Stamataki ◽  
Thomas Kjeldsen
Keyword(s):  
United Kingdom ◽  
Cross Sections ◽  
Flood Risk ◽  
Hydraulic Model ◽  
Water Levels ◽  
Roughness Coefficient ◽  
Documentary Evidence ◽  
Flood Events ◽  
Historical Evidence ◽  
The City

<p>Assessing the risk of future flood events and the implications for flood risk in cities is an economically and socially costly problem. In this research, we assess the utility of documentary evidence of past flood events for contemporary flood risk assessments to reduce the uncertainty in flood frequency estimation due to the interpolation from short annual maximum series (AMS) records.</p><p>The historical city of Bath, United Kingdom, developed in close relation to the River Avon, and evidence of flooding in the city of Bath can be traced back to Roman occupation. For this research a particularly rich record of historical evidence was chosen occurring from the 19<sup>th</sup> century onwards with flood marks on buildings through-out the city as well as documentary evidence in contemporary newspapers and technical reports. The earliest flood mark found in the city of Bath dates to 1823 with 15 more extreme floods after that marked as well. The extensive flooding in 1947 initiated work on what eventually became the present-day Bath flood protection scheme (BFS) which was implemented after the 1960 catalyst flood event.</p><p>Using an existing one-dimensional hydraulic model representing the current hydraulic system of the River Avon in Bath, a historical survey of how the river and its management has changed over time was conducted. The model was developed using historical evidence (e.g. maps, flood marks, photographs, newspaper articles etc), surveyed river cross sections, recorded and design hydrographs from National datasets.</p><p>The 1960 flood is reconstructed numerically using all available data, from flood marks to old surveyed river cross sections.  The resulting hydraulic model is used to investigate the effect of the Bath Flood Defence Scheme. Sensitivity studies with different values for the roughness coefficient are also presented in order to assess the uncertainty on water levels during extreme events. Finally, the numerically reconstructed historical peak flood discharge is compared with the results obtained using a simple Manning equation approach to assess the two methods. This paper demonstrates how hydraulic modelling can be applied to historical data and offers considerable potential to further investigations in the improvement of design flood flows.</p>

Honors Programs as a Way to Grow the Discipline

2008 ◽  
Vol 12 (2) ◽  
pp. 50-53 ◽  
Author(s):  
Renae R. Schumann
Keyword(s):  
Clinical Research ◽  
Evaluation Criteria ◽  
Student Growth ◽  
Honors Programs ◽  
Nursing Research ◽  
Honors Program ◽  
Faculty Roles ◽  
Honors Courses ◽  
Advanced Education ◽  
The One

Honors programs and courses can be characterized by large impersonal classes with differences in assignments and evaluation criteria compared to non-honors courses. This article begins to tell the story of a nursing honors program in which expert researchers and educators mentor highly motivated students, introducing them to nursing research and to faculty roles. The one-on-one relationships developed during the two-semester program encourage student growth and academic and career success. Mentored students are more confident in their ability to participate in clinical research and pursue advanced education.

scholarly journals PERCEPTION OF COMPETITIVENESS IN THE CONTEXT OF SUSTAINABLE DEVELOPMENT: FACETS OF “SUSTAINABLE COMPETITIVENESS”

2010 ◽  
Vol 11 (2) ◽  
pp. 341-365 ◽  
Author(s):  
Audronė Balkytė ◽  
Manuela Tvaronavičienė
Keyword(s):  
Sustainable Development ◽  
Evaluation Criteria ◽  
Theoretical Models ◽  
Research Area ◽  
Social Progress ◽  
Future Research ◽  
Europe 2020 ◽  
New Strategy ◽  
The One ◽  
Research Initiatives

European Council agreed to the European Commission's proposal to launch a new strategy for jobs and growth ‐ the new European Union strategy for smart, sustainable and inclusive growth ‐ “Europe 2020”. This will lead to a new concept of the competitiveness and deeper relationship between sustainable development and competitiveness. The aim of this article is to set out the future research area of competitiveness theory taking into account the development of competitiveness concept and existing research tendencies. On the one hand, for developing the new concept of competitiveness, it is necessary to critically analyse existing studies on competitiveness. Researchers, examining the problems of competitiveness, differently approach the concept of competitiveness, suggesting different definitions, classification, factors, models of competitiveness, and evaluation criteria. Despite all the discussions on competitiveness however, no clear definition or model of competitiveness has yet been developed. On the other hand, globalization, economic dynamism and social progress, sustainability and competitiveness go hand‐in‐hand. Competitiveness should be underpinned by a broad vision for the economy and society. There is a need of research initiatives to develop the new concept of “Sustainable competitiveness” in the context of globalisation, with much of the research focusing on how sustainable development and competitiveness interact. Such additional research will lead to new theoretical models describing the relationships between international globalization, economic growth, sustainable development, wellbeing and competitiveness. Santrauka Europos Vadovu Taryba pritare Europos Komisij os pasiūlytai ekonomikos augimo ir darbo vietu kūrimo strategijai ‐ “Europa 2020” ‐ naujai Europos Sajungos strategijai del pažangaus, tvaraus ir integruoto augimo. Tai sudaro prielaidas naujai konkurencingumo sampratai ir gilesniam darnaus vystymosi ir konkurencingumo saryšiui. Šio straipsnio tikslas yra nustatyti tolesniu konkurencingumo teorijos tyrimu sriti, atsižvelgiant i konkurencingumo koncepcijos pletra ir egzistuojančias moksliniu tyrimu tendencijas. Iš vienos puses, siekiant pletoti konkurencingumo teorija, būtina kritiškai ivertinti egzistuojančias konkurencingumo studijas. Mokslininkai, nagrinedami konkurencingumo problematika, pateikia ivairias konkurencingumo koncepcijas, siūlydami skirtingus apibrežimus, klasifikacija_, veiksnius, konkurencingumo modelius ir vertinimo kriterijus. Nepaisant plačiu diskusiju, kol kas nera susitarta del aiškaus konkurencingumo apibrežimo ar visuotinai pripažistamo modelio. Iš kitos puses, globalizacija, ekonomikos dinamiškumas ir socialine pažanga, darnus vystymasis ir konkurencingumas yra tarpusavyje glaudžiai susije. Plati ekonomikos ir visuomenes vizija turetu būti konkurencingumo pagrindas. Egzistuojantis moksliniu tyrimuporeikis veda link naujos "darnaus kon‐kurencingumo” koncepcijos kūrimo iniciatyvu, ivertinant globalizacija ir daugiau demesio skiriant dar‐naus vystymosi bei konkurencingumo tarpusavio ryšiams. Tokie tolesni tyrimai padetu atrasti naujus teorinius modelius, charakterizuojančius tarptautines globalizacijos, ekonomikos augimo, darnaus vystymosi, geroves kūrimo ir konkurencingumo saryši.

scholarly journals Development of an integrated computational tool to improve performance of irrigation districts

2012 ◽  
Vol 14 (3) ◽  
pp. 716-730 ◽  
Author(s):  
L. Pérez Urrestarazu ◽  
J. A. Rodríguez Díaz ◽  
E. Camacho Poyato ◽  
R. López Luque ◽  
F. M. Borrego Jaraba
Keyword(s):  
Performance Indicators ◽  
Network Performance ◽  
Hydraulic Modeling ◽  
Hydraulic Model ◽  
Irrigation District ◽  
Improve Performance ◽  
Computer Tool ◽  
Calculation Module ◽  
And Performance

Nowadays irrigation district managers require several tools to assess irrigation networks' performance such as hydraulic models, geographic information systems (GIS) or decision support systems (DSS) which are available but as independent elements. Thus, simplifying the use of these tools by means of applications that integrate all these components would be helpful for irrigation district managers. In this paper, a computer tool combining a GIS, a hydraulic model and performance indicators (PIs) has been developed creating a database to deal with most information required in an irritation district. MapObjects Java Edition was used for the GIS integration and EPANET calculation module for the hydraulic modeling. This tool enables the study of the network performance, taking into account real measures (data from the remote control system) and simulated measures (obtained when running the hydraulic model) which are stored in a database and used to calculate different indicators that can be represented in the GIS. The PIs calculated with this tool give important information regarding the network response to different conditions, malfunction problems and failures in supply. Therefore, this tool is also useful to study the effects of improvements and the quality of service provided to farmers.

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