scholarly journals Study on Unsteady Flow Based on Optimized Water Distribution Model in Irrigation District

2020 ◽  
Vol 12 (4) ◽  
pp. 1580
Author(s):  
Jingjing Wu ◽  
Jian Chen ◽  
Yu Han ◽  
Tongshu Li
Keyword(s):  
Unsteady Flow ◽  
Water Distribution ◽  
Search Algorithm ◽  
Optimal Solution ◽  
Irrigation District ◽  
Distribution Model ◽  
Research Areas ◽  
Distribution Process ◽  
Agricultural Areas ◽  
Water Distribution Model

The canal delivery system is the main infrastructure of agricultural irrigation. The efficiency of water use in agriculture can be achieved by mastering the dynamic process of unsteady flow in the channel. In this study, an unsteady flow model for the calculation of the water flow transition information of the river channel during the water distribution process was established, based on the water distribution scheme given by the backtracking-search algorithm (BSA). This model was more suitable for areas with inefficient channel systems. The research areas included the main irrigation channels in Xiying City, which is one of the typical agricultural areas in northwestern China. The scheme obtained by optimal solution proposed for Xiying Irrigation District was feasible. According to the results of the flow simulations, the sluice gate calculation correlation could determine the change process of the gate opening of each channel, which provided a basis to realize the modernization of the irrigation area.

scholarly journals Elevation Effect in Urban Water Distribution Model

2018 ◽  
Vol 153 ◽  
pp. 09001
Author(s):  
Rangsan Wannapop ◽  
Thira Jearsiripongkul ◽  
Krit Jiamjiroch
Keyword(s):  
Water Supply ◽  
Water Distribution ◽  
Supply System ◽  
Distribution Model ◽  
Pipeline System ◽  
Urban Water ◽  
Main Pipeline ◽  
Pipe Network ◽  
Pipeline Network ◽  
Water Distribution Model

Metropolitan Waterworks Authority (MWA) is Thailand's national government agency responsible for the supply of water to 3 provinces Bangkok, Nonthaburi and Samut Prakan with more than 2,384.9 km2 of service area and 2,281,058 consumers in the year 2016. Bangkok, which is both the capital and the economic center of the country, is densely populated. Consequently, there is a huge demand for water; MWA has to supply 5.914 million cubic meters of water per day. Because the metropolitan water supply area is a densely populated city, the water supply system is very complex like a spider’s web. For this reason, MWA has adopted EPANET software for its water supply managing tool in the main pipeline system. There are some mistakes in the main pipe network; the elevations of the nodes are not assigned, so there are some errors. In this study, we have assigned elevations for all nodes on the pipeline network based on mean sea level (MSL). After adjusting the elevation of each node, it was found that the new pipeline network has increased the correlation between means to 0.893 from the existing model mean of that is 0.803 of accuracy up 0.09 (11.2%).

scholarly journals Fuzzy optimization based Water Distribution Network design using Self-Adaptive Cuckoo Search Algorithm

2021 ◽  
Author(s):  
A. Vasan ◽  
K. Srinivasa Raju ◽  
B. Sriman Pankaj
Keyword(s):  
Membership Function ◽  
Water Distribution ◽  
Search Algorithm ◽  
Fuzzy Optimization ◽  
Optimal Solution ◽  
Water Distribution Network ◽  
Cuckoo Search ◽  
Cuckoo Search Algorithm ◽  
Pareto Optimal Solutions ◽  
Optimal Solutions

Abstract Water Distribution Network(s) (WDN) design is gaining prominence in the urban planning context. Several factors that play a significant role in design are uncertainty in data, non-linear relation of head loss & discharge, combinatorial nature of the problem, and high computational requirements. In addition, many conflicting objectives are possible and required for effective WDN design, such as cost, resilience, and leakage. Most of the research work published has used multiobjective evolutionary optimization in solving such complex WDN. However, the challenge of such population based evolutionary approaches is that they provide multiple trade-off Pareto optimal solutions to the decision-maker who will have to choose another set of techniques to arrive at a single optimal solution. The present study employs a fuzzy optimization approach that would provide a single optimal WDN design for Hanoi and Pamapur, India. Maximization of network resilience (NR) and minimization of network cost (NC) are employed in a multiobjective context. Later, minimization of network leakages (NL) is also incorporated, leading to three objective problems. Hyperbolic Membership Function (HMF), Exponential Membership Function (EMF), and Non-linear Membership Function (NMF) are employed in Self-Adaptive Cuckoo Search Algorithm based fuzzy optimization. HMF is found suitable to determine the best possible WDN design for chosen case studies based on the highest degree of satisfaction. HIGHLIGHT Most of the research conducted till now have used evolutionary multiobjective optimization in solving WDNs. But, the challenge of such evolutionary approaches is that they provide multiple trade-off pareto optimal solutions to the decision maker who will have to further choose another methodology to converge to a single optimal solution. The proposed methodology would simplify the decision-making process for an engineer.

A dynamic control water distribution model of steel in continuous casting

2012 ◽  
Vol 33 ◽  
pp. 012016
Author(s):  
Jian-Xun Fu ◽  
Weng-Sing Hwang ◽  
De-Chang Tsai ◽  
MingHsiu Tsai ◽  
Chien-Hsun Wang
Keyword(s):  
Continuous Casting ◽  
Water Distribution ◽  
Dynamic Control ◽  
Distribution Model ◽  
Water Distribution Model ◽  
Control Water

scholarly journals Water distribution model for center pivot end gun sprinklers

2019 ◽  
Vol 23 (7) ◽  
pp. 477-483
Author(s):  
Giuliani Prado ◽  
Alberto Colombo ◽  
Antônio C. Barreto
Keyword(s):  
Water Distribution ◽  
Working Condition ◽  
Field Tests ◽  
Distribution Model ◽  
Absolute Difference ◽  
Working Pressure ◽  
Irrigated Area ◽  
Center Pivot ◽  
Substantial Investment ◽  
Water Distribution Model

ABSTRACT End gun sprinklers can increase the irrigated area by center pivot irrigation systems without a substantial investment. This study was carried out at the Universidade Federal de Lavras, MG state, Brazil, and aimed to describe and validate a water distribution model for center pivot end gun sprinklers. The gun sprinkler PLONA-RL250®, attached at the end point of a center pivot, was used to evaluate the model in field tests. The sprinkler working conditions considered were nozzle diameters of 14 x 6 mm, working pressure of 292 kPa, and four asymmetric wetted angle adjustments (95 + 20º; 90 + 90º; 60 + 60º; 45 + 45º). These tests were carried out for wind speed lower than 0.9 m s-1. The measured and simulated irrigation depths showed an average absolute difference of 0.65 mm and determination coefficients from 71.55 to 89.37%. Based on the confidence coefficient (c = 0.82) the model can be classified as very good (0.76 ≤ c ≤ 0.85). Sprinkler wetted angle adjustment of 110º (95 + 20º) resulted in uniform water distribution and, for effective radius of throw between 70 to 90% of the gun sprinkler´s radius of throw, this working condition resulted in Christiansen’s uniformity greater than 80%.

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