scholarly journals Experimental Study on the Inlet Discharge Capacity under Different Clogging Conditions

Water ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 826
Author(s):  
Xiaoli Hao ◽  
Jie Mu ◽  
Hongjian Shi
Keyword(s):  
Water Flow ◽  
Discharge Capacity ◽  
Drainage System ◽  
Early Warning Systems ◽  
Practical Significance ◽  
Formation Mechanisms ◽  
Flow State ◽  
Storm Drainage ◽  
Orifice Flow ◽  
The Impact

Storm drainage inlets transport urban runoff and discharge to underground sewer systems. If the inlet structure is blocked, the urban drainage system is hampered, leading to urban flooding. To quantitatively analyze the influence of clogging conditions on inlet discharge capacity, laboratory experiments were conducted to address the impact of different inlet clogging conditions on inlet discharge capacity under different upstream discharge conditions. These were based on a two-layer platform that mimicked a complete inlet structure including a drainage grate, a rainwater well, and a connecting pipe. The results show that the water flow near the inlet was similar to weir flow when the rainwater well was not full, whereas the water flow state near the inlet behaved similarly to orifice flow after becoming full. In addition, it was found that the clogging extent and position can significantly influence the comprehensive discharge capacity of the street inlet. The experimental dataset was used to calculate the inlet discharge coefficients of the weir and orifice flow states under different clogging conditions. The results are applicable to research addressing the formation mechanisms of urban floods. Additionally, this study is of practical significance for early warning systems and emergency response support during heavy rainfall.

A THEORETICAL DISCUSSION AND CASE STUDY ON THE DEVELOPMENT OF SMART STORM DRAINAGE UNIT FOR COMPACT CITIES

2016 ◽  
Vol 78 (5-3) ◽  
Author(s):  
Dedimuni Charmaine Nadeesha Chandraseana ◽  
Khamaruzaman Wan Yusof ◽  
Muhammad Raza Ul Mustafa ◽  
Zahiraniza Mustaffa ◽  
Salihi Ibrahim Umar
Keyword(s):  
Urban Form ◽  
Drainage System ◽  
Floating Population ◽  
Geographical Information ◽  
Computational Techniques ◽  
Highly Sensitive ◽  
Drainage Channels ◽  
Storm Drainage ◽  
Effective Drainage ◽  
The Impact

A moderate rainfall event can lead to harsh flash floods in most of the compact cities. Present urbanization happening in these cities creates an imbalance between generated urban runoff volume and effective drainage capacity. For the survival of these, it is vital in enhancing the efficiency of an urban drainage system. However, it is a complicated task due to the accumulation of solid waste in drainage channels. These drainage systems are super sensitive to some external factors caused by their immediate surroundings. This study found out the impact of the urban form, population agglomeration, floating population, imminent prone areas of urban sprawl and waste disposing patterns of settlers can be highly influenced to the efficiency of a storm drainage system. Hence, Geographical Information System based computational techniques and weighted fussy sets are being used to track the attention need areas of the system. These particular zones to be treated through the design of "Smart Storm Drainage Unit". By this, it is expected to maintain a clear drainage channel for transportation of surface runoff all the time. Thus, by Smart Storm Drainage will be fixed into the breakdown areas or highly sensitive areas of a drainage system. This paper discusses the impact of surrounding urban area to the breakdown of drainage system and fixates the problem by bypassing “Smart Storm Drainage Unit”.

scholarly journals Staged cost optimization of urban storm drainage systems based on hydraulic performance in a changing environment

2008 ◽  
Vol 5 (3) ◽  
pp. 1479-1509 ◽  
Author(s):  
M. Maharjan ◽  
A. Pathirana ◽  
B. Gersonius ◽  
K. Vairavamoorthy
Keyword(s):  
Environmental Changes ◽  
Cost Optimization ◽  
Rapid Change ◽  
Drainage System ◽  
Life Time ◽  
Hydraulic Performance ◽  
Economic Losses ◽  
Traditional Practice ◽  
Storm Drainage ◽  
The Impact

Abstract. Urban flooding causes large economic losses, property damage and loss of lives. The impact of environmental changes mainly, the urbanization and the climatic change leads to increased runoff and increased peak flows which the drainage system must be able to cope with to overcome possible damage and inconveniences caused by the induced flooding. Allowing for detention storage to compliment the capacity of the drainage system network is one of the approaches to reduce urban floods. The traditional practice was to design systems against stationary environmental forcings – including design rainfall, landuse, etc. Due to the rapid change in climate-environment, this approach is no longer economically viable and safe, and explicit consideration of changes that gradually take place during the life-time of the drainage system is warranted. In this paper, a staged cost optimization tool based on the hydraulic performance of the drainage system is presented. A one dimensional hydraulic model is used for hydraulic evaluation of the network together with a genetic algorithm based optimization tool to determine optimal intervention timings and amounts throughout the lifespan of the drainage network. The model was applied in a case study area in the city of Porto Alegre, Brazil. It was concluded that considerable financial savings and/or additional level of flood-safety can be achieved by approaching the design problem as a staged plan rather than one-off scheme.

scholarly journals Staged cost optimization of urban storm drainage systems based on hydraulic performance in a changing environment

2009 ◽  
Vol 13 (4) ◽  
pp. 481-489 ◽  
Author(s):  
M. Maharjan ◽  
A. Pathirana ◽  
B. Gersonius ◽  
K. Vairavamoorthy
Keyword(s):  
Environmental Changes ◽  
Cost Optimization ◽  
Rapid Change ◽  
Drainage System ◽  
Life Time ◽  
Hydraulic Performance ◽  
Economic Losses ◽  
Storm Drainage ◽  
Explicit Consideration ◽  
The Impact

Abstract. Urban flooding causes large economic losses, property damage and loss of lives. The impact of environmental changes, mainly urbanization and climatic change, leads to increased runoff and peak flows which the drainage system must be able to cope with to reduce potential damage and inconvenience. Allowing for detention storage to compliment the conveyance capacity of the drainage system network is one of the approaches to reduce urban floods. Contemporary practice is to design systems against stationary environmental forcings – including design rainfall, landuse, etc. Due to the rapid change in the climate- and the urban environment, this approach is no longer appropriate, and explicit consideration of gradual changes during the life-time of the drainage system is warranted. In this paper, a staged cost optimization tool based on the hydraulic performance of the drainage system is presented. A one dimensional hydraulic model is used for hydraulic evaluation of the network together with a genetic algorithm based optimization tool to determine optimal intervention timings and responses over the analysis period. The model was applied in a case study area in the city of Porto Alegre, Brazil. It was concluded that considerable financial savings and/or additional level of flood-safety can be achieved by approaching the design problem as a staged plan rather than one-off scheme.

scholarly journals Oddziaływanie przepustu na warunki hydrauliczne przepływu wody w głównym rowie systemu odwadniającego stopnia wodnego Łączany

2017 ◽  
Vol 26 (1) ◽  
pp. 28-37
Author(s):  
Agata Majerczyk ◽  
Bogusław Michalec
Keyword(s):  
Water Flow ◽  
Cross Section ◽  
Catchment Area ◽  
Drainage System ◽  
Flow Conditions ◽  
Vistula River ◽  
Hydraulic Conditions ◽  
The Impact ◽  
Heavy Rains

The aim of the study is to analyze the impact of the culvert on the hydraulic conditions of water flow in the “R” ditch. The culvert was located on the main ditch in drainage system of Łączany barrage on the Vistula river. The research on ditch’s capacity in analyzed cross-section showed that the capacity decreased. The changes of cross-section caused by construction of the culvert substantially affect the flow conditions of water in the channel. The calculations showed that the existing dimension of culvert is not enough to pass the reliable discharge. The reliable flow was set for catchment area of 3.32 km2, not 0.67 km2, which is bigger than catchment area estimated in drainage project. It includes watercourses leading water to ditch with surrounds Kasztelan Pond, and then to “R” ditch. Discharges larger than 2.27 m3·s–1, particularly reliable flow, reach banks of the ditch “R” and flows out the channel. Discharges larger than the reliable discharge do not fit into the analyzed cross-section causing pouring out the water from the channel. On the basis of information taken from the locals and serving the system it is known that such a phenomenon occurs during the periods of heavy rains and floods.

scholarly journals The model and simulation of low impact development of the sponge airport, China

2019 ◽  
Vol 20 (2) ◽  
pp. 383-394 ◽  
Author(s):  
Jing Peng ◽  
Jiayi Ouyang ◽  
Lei Yu ◽  
Xinchen Wu
Keyword(s):  
Flood Control ◽  
Low Impact Development ◽  
Water Environment ◽  
Drainage System ◽  
Practical Significance ◽  
International Airport ◽  
Model And Simulation ◽  
Impervious Area ◽  
Before And After ◽  
Airport Runway

Abstract Recently urban waterlogging problems have become more and more serious, and the construction of an airport runway makes the impervious area of the airport high, which leads to the deterioration of the water environment and frequent waterlogging disasters. It is of great significance to design and construct the sponge airport with low impact development (LID) facilities. In this paper, we take catchment N1 of Beijing Daxing International Airport as a case study. The LID facilities are designed and the runoff process of a heavy rainfall in catchment N1 is simulated before and after the implementation of LID facilities. The results show that the total amount of surface runoff, the number of overflow junctions and full-flow conduits of the rainwater drainage system in catchment N1 of Beijing Daxing International Airport are significantly reduced after the implementation of the LID facilities. Therefore, the application of LID facilities has greatly improved the ability of the airport to remove rainwater and effectively alleviated the risk of waterlogging in the airport flight area. This study provides theoretical support for airport designers and managers to solve flood control and rainwater drainage problems and has vital practical significance.

scholarly journals Erosion Transportation Processes as Influenced by Gully Land Consolidation Projects in Highly Managed Small Watersheds in the Loess Hilly–Gully Region, China

Water ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1540
Author(s):  
Qianqian Ji ◽  
Zhe Gao ◽  
Xingyao Li ◽  
Jian’en Gao ◽  
Gen’guang Zhang ◽  
...  
Keyword(s):  
Similarity Theory ◽  
Design Method ◽  
Simulation Method ◽  
Practical Significance ◽  
Land Consolidation ◽  
Small Watershed ◽  
Flood Peak ◽  
Erosion Area ◽  
The Impact ◽  
Erosion Environment

The Loess Hilly–Gully region (LHGR) is the most serious soil erosion area in the world. For the small watershed with high management in this area, the scientific problem that has been paid attention to in recent years is the impact of the land consolidation project on the erosion environment in the gully region. In this study, the 3D simulation method of vegetation, eroded sediment and pollutant transport was innovated based on the principles of erosion sediment dynamics and similarity theory, and the impacts of GLCP were analyzed on the erosion environment at different scales. The verification results show that the design method and the scale conversion relationship (geometric scale: λl = 100) were reasonable and could simulate the transport process on the complex underlying surface of a small watershed. Compared with untreated watersheds, a significant change was the current flood peak lagging behind the sediment peak. There were two important critical values of GLCP impact on the erosion environment. The erosion transport in HMSW had no change when the proportion was less than 0.85%, and increased obviously when it was greater than 3.3%. The above results have important theoretical and practical significance for watershed simulation and land-use management in HMSW.

scholarly journals Seasonality and Dynamics of Atmospheric Teleconnection from the Tropical Indian Ocean and the Western Pacific to West Antarctica

Atmosphere ◽  
2021 ◽  
Vol 12 (7) ◽  
pp. 849
Author(s):  
Hyun-Ju Lee ◽  
Emilia-Kyung Jin
Keyword(s):  
Indian Ocean ◽  
Rossby Wave ◽  
Tropical Indian Ocean ◽  
Western Pacific ◽  
Tropical Region ◽  
Formation Mechanisms ◽  
West Antarctica ◽  
Background Flow ◽  
The Impact ◽  
The Western Pacific

The global impact of the tropical Indian Ocean and the Western Pacific (IOWP) is expected to increase in the future because this area has been continuously warming due to global warming; however, the impact of the IOWP forcing on West Antarctica has not been clearly revealed. Recently, ice loss in West Antarctica has been accelerated due to the basal melting of ice shelves. This study examines the characteristics and formation mechanisms of the teleconnection between the IOWP and West Antarctica for each season using the Rossby wave theory. To explicitly understand the role of the background flow in the teleconnection process, we conduct linear baroclinic model (LBM) simulations in which the background flow is initialized differently depending on the season. During JJA/SON, the barotropic Rossby wave generated by the IOWP forcing propagates into the Southern Hemisphere through the climatological northerly wind and arrives in West Antarctica; meanwhile, during DJF/MAM, the wave can hardly penetrate the tropical region. This indicates that during the Austral winter and spring, the IOWP forcing and IOWP-region variabilities such as the Indian Ocean Dipole (IOD) and Indian Ocean Basin (IOB) modes should paid more attention to in order to investigate the ice change in West Antarctica.

scholarly journals System Dynamics Model for the Evolutionary Behaviour of Government Enterprises and Consumers in China’s New Energy Vehicle Market

2020 ◽  
Vol 12 (4) ◽  
pp. 1578 ◽  
Author(s):  
Hongxia Sun ◽  
Yao Wan ◽  
Huirong Lv
Keyword(s):  
System Dynamics ◽  
Motor Vehicle ◽  
Replicator Dynamics ◽  
Evolutionary Game ◽  
Practical Significance ◽  
Subsidy Policy ◽  
New Energy ◽  
New Energy Vehicle ◽  
The Impact ◽  
Vehicle Market

Exhaust pollution and energy crises are worsening worldwide. China has become the largest motor vehicle producer; thus, promoting the use of new energy vehicles (NEVs) in China has important practical significance. In this paper, considering the limited rationality of governments, NEV enterprises and consumers, we study the subsidy policy of the China NEV market using the evolutionary game and system dynamics (SD) methods. First, a tripartite evolutionary game model is developed and the replicator dynamics equations and Jacobian matrix are obtained. A SD simulation of the model was conducted to further clarify the impact of the initial market proportion and three variables used in the model. The results show that the initial market proportion affects the evolution speed but does not affect the evolution result when the three group players all choose a mixed strategy. For governments, they should not hastily cancel price subsidies provided to consumers; rather, they should dynamically adjust the rate of the subsidy decrease and increase the consumers’ extra cost for purchasing fuel vehicles (FVs). NEV enterprises should appropriately increase their investments in the research and development (R&D) of NEVs.

The Determinants and Consequences of Accurate Beliefs About Childhood Vaccinations

2017 ◽  
Vol 47 (3) ◽  
pp. 628-649 ◽  
Author(s):  
Mark R. Joslyn ◽  
Steven M. Sylvester
Keyword(s):  
Educational Attainment ◽  
Survey Data ◽  
Party Identification ◽  
Motivated Reasoning ◽  
Parental Choice ◽  
Practical Significance ◽  
The Public ◽  
Policy Attitudes ◽  
The Individual ◽  
The Impact

In this article, we examine the individual predictors that are responsible for accurate beliefs about the link between vaccinations and autism. We then show how these beliefs affect policy preferences about vaccines. We derive two hypotheses from motivated reasoning theory and test these on national survey data from Gallup and CBS News. Republicans were less likely to report accurate beliefs than Democrats. In addition, educational attainment modified the impact of party identification. The gap between Republicans and Democrats in likelihood of reporting accurate beliefs was largest among the most educated portion of the public. Finally, we show that accurate beliefs about vaccines, independent of statistical controls, are important predictors of policy attitudes about unvaccinated children attending public school and parental choice about the decision to vaccinate. We discuss the theoretical and practical significance of these findings.

Effect of international labor mobility on social-economic development of countries

2021 ◽  
pp. 54-59
Author(s):  
E.I. Huseinova ◽  
Keyword(s):  
Economic Development ◽  
Social Economic ◽  
Negative Impact ◽  
Research Work ◽  
Practical Significance ◽  
Problem Solution ◽  
International Mobility ◽  
Labor Resources ◽  
Social Economic Development ◽  
The Impact

The goal of the research is the specification of the effect of international mobility of labor resources on the social-economic development of a country, as well as the impact on the GDP volume. The main purpose set in the investigation is the study of international experience of the problem solution. Another goal of the research work is the international mobility of labor resources in conditions of national economy. The methods of analysis, grouping and analogy were used in the investigation. In the research work carried out by the author, the properties of international mobility of labor resources were commented, the factors and reasons of their occurrence specified as well. The analysis has been conducted and the system of effect mobility of labor resources on GDP growth in some countries and their impact on the state of labor market developed. Due to the research surveys, the reasons for development of international mobility of labor resources and direction of labor migration streams in Azerbaijan have been identified. The impact of international mobility of labor resources on social-economic development has been evaluated. Positive and negative impact of international mobility of labor resources on social-economic development of Azerbaijan, as well as setting measures on migrant admission as contributing country in case of negative effect have been specified in the innovation of research. Practical significance of the investigation lies in the regulation of international mobility of labor resources, introduction with experience of difference countries by the system of statistical figures and formation of their resources, grouping and using the data for problem solution in our country.

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