scholarly journals Improving water management efficiency by using optimization-based control strategies: the Barcelona case study

2009 ◽  
Vol 9 (5) ◽  
pp. 565-575 ◽  
Author(s):  
C. Ocampo-Martinez ◽  
V. Puig ◽  
G. Cembrano ◽  
R. Creus ◽  
M. Minoves
Keyword(s):  
Drinking Water ◽  
Flow Control ◽  
Large Scale ◽  
Control Strategies ◽  
Management Strategies ◽  
Economic Cost ◽  
Performance Indexes ◽  
Future Demands ◽  
Control Stability

This paper describes the application of model-based predictive control (MPC) techniques to the flow management in large-scale drinking water networks including a telemetry/telecontrol system. MPC technique is used to generate flow control strategies from the sources to the consumer areas to meet future demands, optimizing performance indexes associated to operational goals such as economic cost, network safety volumes and flow control stability. The designed management strategies are applied to a real case study based on a representative model of the drinking water network of Barcelona (Spain).

scholarly journals Modular Feedback Control of Networked Systems by Clustering: A Drinking Water Network Case Study

Processes ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 389 ◽  
Author(s):  
José María Maestre ◽  
Francisco Lopez-Rodriguez ◽  
Francisco Javier Muros ◽  
Carlos Ocampo-Martinez
Keyword(s):  
Drinking Water ◽  
Feedback Control ◽  
Large Scale ◽  
Control Strategies ◽  
System Stability ◽  
Linear Matrix ◽  
Water Network ◽  
Common Lyapunov Function ◽  
Network Topologies

This article presents a method based on linear matrix inequalities (LMIs) for designing a modular feedback control law, whose synthesis guarantees the system stability, while switching to different network topologies. Such stability is achieved by means of a common Lyapunov function to all network admissible configurations. Several mechanisms to relieve the computational burden of this methodology in large-scale systems are also presented. To assess its applicability, the modular controller is tested on a real case study, namely the Barcelona drinking water network (DWN), and its performance is compared with that of other control strategies, showing the effectiveness of the proposed approach.

scholarly journals A Predictive Fleet Management Strategy for On-Demand Mobility Services: A Case Study in Munich

Electronics ◽  
2020 ◽  
Vol 9 (6) ◽  
pp. 1021
Author(s):  
Michael Wittmann ◽  
Lorenz Neuner ◽  
Markus Lienkamp
Keyword(s):  
Service Quality ◽  
Large Scale ◽  
Management Strategies ◽  
Global Market ◽  
Fleet Management ◽  
Bipartite Matching ◽  
Fleet Size ◽  
Original Size ◽  
Real Time Information

The global market for MoD services is in a state of rapid and challenging transformation, with new market entrants in Europe, such as Uber, MOIA, and CleverShuttle, competing with traditional taxi providers. Rapid developments in available algorithms, data sources, and real-time information systems offer new possibilities of maximizing the efficiency of MoD services. In particular, the use of demand predictions is expected to contribute to a reduction in operational costs and an increase in overall service quality. This paper examines the potential of predictive fleet management strategies applied to a large-scale real-world taxi dataset for the city of Munich. A combination of state-of-the art dispatching algorithms and a predictive RHC optimization for idle vehicle rebalancing was developed to determine the scale by which a fleet size can be reduced without affecting service quality. A simulation study was conducted over a one-week period in Munich, which showed that predictive fleet strategies clearly outperform the present strategy in terms of both service quality and costs. Furthermore, the results showed that current taxi fleets could be reduced to 70% of their original size without any decrease in performance. In addition, the results indicated that the reduced fleet size of the predictive strategy was still 20% larger compared to the theoretical optimum resulting from a bipartite matching approach.

scholarly journals Water demand forecasting for the optimal operation of large-scale drinking water networks: The Barcelona Case Study.

2014 ◽  
Vol 47 (3) ◽  
pp. 10457-10462 ◽  
Author(s):  
Ajay Kumar Sampathirao ◽  
Juan Manuel Grosso ◽  
Pantelis Sopasakis ◽  
Carlos Ocampo-Martinez ◽  
Alberto Bemporad ◽  
...  
Keyword(s):  
Drinking Water ◽  
Water Demand ◽  
Large Scale ◽  
Demand Forecasting ◽  
Optimal Operation ◽  
Water Networks ◽  
Water Demand Forecasting

scholarly journals The Panglima Laot of Aceh: a case study in large-scale community-based marine management after the 2004 Indian Ocean tsunami

Oryx ◽  
2012 ◽  
Vol 46 (4) ◽  
pp. 495-500 ◽  
Author(s):  
Crispen Wilson ◽  
Matthew Linkie
Keyword(s):  
Indian Ocean ◽  
Local Knowledge ◽  
Large Scale ◽  
Management Strategies ◽  
Indian Ocean Tsunami ◽  
Government Officials ◽  
2004 Indian Ocean Tsunami ◽  
Marine Management ◽  
Data Points

AbstractDespite dating back over 400 years the relevance of traditional fisheries management in Aceh, Indonesia, still remains high. Aceh was, however, greatly affected by the December 2004 Indian Ocean tsunami that claimed an estimated 167,000 lives, including 14,000 fishermen and 59 of the 193 traditional marine leaders (Panglima Laot). This tragic loss of life was accompanied by a substantial loss of local knowledge, such as the locations of hazardous fishing grounds. In this study we describe an innovative project that sought to rebuild a post-tsunami fisheries sector by re-engaging and empowering the Panglima Laot. During April–June 2008 GPS (global positioning system) sounding devices were installed on 53 local fishing boats and hazardous fishing areas mapped based on local knowledge, and shared amongst fishermen. During July–December 2008 nearly five million GPS data points were collected, from which detailed bathymetric maps were produced and shared between fishermen and Aceh government officials. Significant project outputs included a map of fishing areas over 20,000 km2, which included three new seamounts, one of which expanded Aceh's provincial boundary by > 1.3 million ha, and a Panglima Laot decree that reduced fishing in hazardous areas of high coral density by 23.3%. Our findings have wide applicability. Locally, the introduction of GPS technology and sharing of traditional knowledge resulted in fishermen developing and implementing their own management strategies and demonstrating their ability to stay out of restricted areas. Provincially, this project provided a framework through which government agencies and academic institutions could effectively engage with local customary leaders and their fishing communities.

scholarly journals Rabies control in wildlife: the golden jackal (Canis aureus) requests for attention – a case study

2020 ◽  
Vol 24 (2) ◽  
Author(s):  
Péter Kemenszky ◽  
Ferenc Jánoska ◽  
Gábor Nagy ◽  
Ágnes Csivincsik
Keyword(s):  
Paradigm Shift ◽  
Large Scale ◽  
Control Strategies ◽  
Control Programme ◽  
Wild Boar Population ◽  
Research Groups ◽  
Multidisciplinary Research ◽  
Natural Reservoir ◽  
Rabies Control

In Hungary, the rabies control programme with oral bait immunisation of wild carnivores dates back to 1992. Since than, the rules of vaccine placement on bait density has not changed, in spite of drastic expansion of both the carnivore community and the wild boar population in Europe. Though, all these elements of the concerned ecosystem compete for the baits. This case study was based on the accidental finding of vaccine blisters in jackal stomachs during a large-scale investigation on jackals’ feeding ecology. The results showed 3.17% (0.57-10.87%) frequency of bait occurrence in jackal specimens harvested during the vaccination term. This finding contradicted previous reports on high bait uptake rate and rabies seroconversion in golden jackals. These results called the attention the need for paradigm shift in management of diseases maintained in a natural reservoir. In the authors’ opinion, for reassuring result, multidisciplinary research groups should re-evaluate disease control strategies time and again.

Analyzing Simulation-Based Active Traffic Management Impact on a Large-Scale Regional Network

2019 ◽  
Vol 2673 (8) ◽  
pp. 638-647
Author(s):  
Minha Lee ◽  
Chenfeng Xiong ◽  
Zheng Zhu ◽  
Weiyi Zhou ◽  
Lei Zhang
Keyword(s):  
Traffic Management ◽  
Large Scale ◽  
Dynamic Traffic Assignment ◽  
Management Strategies ◽  
Ramp Metering ◽  
Vast Number ◽  
Traffic Conditions ◽  
Road Systems ◽  
Traffic Impacts

A vast number of real-time corridor management strategies have been introduced because the dynamics of traffic patterns and increased congestion result in challenging problems on road systems. Although these strategies can offer positive impacts on regional traffic, their evaluation tools are often limited to the scope of one specific corridor. To fill this gap, this study integrates a mesoscopic dynamic traffic assignment simulation model with an existing traffic-responsive ramp metering strategy. This integrated model is suitable for network-wide analysis and large-scale simulation of integrated corridor management strategies. The integrated modeling platform is demonstrated as a practice-ready tool. We present a case study that explores the benefits of metering control under various traffic conditions in a real-world network in Maryland. Both local and network-wide impacts are illustrated in the case study. This is one of the first attempts to simultaneously analyze network-wide traffic impacts and capture minute-by-minute demand–supply interactions under managed corridor strategies. The results indicate that ramp metering is beneficial even under non-recurrent traffic conditions at multiple spatial resolutions.

Identification of Energy Storage Capacities Within Large-Scale Power Plants and Development of Control Strategies to Increase Marketable Grid Services

2015 ◽  
Author(s):  
Moritz Huebel ◽  
Juergen Nocke ◽  
Sebastian Meinke ◽  
Egon Hassel
Keyword(s):  
Energy Storage ◽  
Power Plants ◽  
Large Scale ◽  
Control Strategies ◽  
Electrical Grid ◽  
Additional Control ◽  
Dynamic Simulation Model ◽  
Future Demands ◽  
Critical Components ◽  
Dynamic Investigation

In order to meet future demands, existing and new plants need to be optimized to offer additional control reserves to stabilize an electrical grid, which is highly penetrated by fluctuating renewables. Since this requires a dynamic investigation, transient physical based models of different power plants have been developed to evaluate effects of increased flexibility as well as to develop optimization strategies. The approach has been tested for a specific 500 MW lignite-fired power plant. It includes detailed modeling of the incorporated sub-systems and their interactions as well as the implementation of the power plant’s control system. The dynamic simulation model is used for the identification of energy storage potentials within the process and for testing and developing control strategies in order to increase flexibility and marketable output of the process. The strategies are benchmarked and evaluated based on the consideration of exergetic efficiency and lifetime-consumption of critical components.

scholarly journals Environmental Impacts of Reusable Transport Items: A Case Study of Pallet Pooling in a Retailer Supply Chain

2019 ◽  
Vol 11 (11) ◽  
pp. 3147 ◽  
Author(s):  
Riccardo Accorsi ◽  
Giulia Baruffaldi ◽  
Riccardo Manzini ◽  
Chiara Pini
Keyword(s):  
Information System ◽  
Supply Chain ◽  
Geographic Information System ◽  
Environmental Impacts ◽  
Large Scale ◽  
Best Practice ◽  
Management Strategies ◽  
Geographic Information ◽  
Pollutant Emissions

Manufacturing, storage, and transportation processes are typically facilitated by pallets, containers, and other reusable transport items (RTIs) designed to guarantee many cycles along a lifespan of several years. As a consequence, both supply and reverse transportation of RTIs need to be managed to avoid stockout along the supply chain and the unsustainable production of new tools from virgin materials. This paper focuses on the business of pallet management by analyzing the transport operations of a pallet pooling network serving a large-scale nationwide retailer. The pooler is responsible for supplying, collecting, and refurbishing pallets. The combination of the pooler’s management strategies with different retailer network configurations results in different pooling scenarios, which are assessed and compared in this paper through a what-if analysis. The logistical and environmental impacts generated by the pallet distribution activities are quantified per each scenario through a tailored software incorporating Geographic Information System (GIS) and routing functionalities. Findings from this analysis suggest how to reduce vehicle distance traveled (vehicles-km) by 65% and pollutant emissions by 60% by combining network infrastructures and pooling management strategies—identifying an empirical best practice for managers of pallet businesses.

scholarly journals Low Trihalomethane Formation during Managed Aquifer Recharge with Chlorinated Desalinated Water

Water ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 711 ◽  
Author(s):  
Anat Bernstein ◽  
Raz Studny ◽  
Vinolia Shyntychea ◽  
Daniel Kurtzman ◽  
Yonatan Ganot ◽  
...  
Keyword(s):  
Drinking Water ◽  
Vadose Zone ◽  
Large Scale ◽  
Managed Aquifer Recharge ◽  
Small Scale ◽  
Aquifer Recharge ◽  
Unique Case ◽  
Order Of Magnitude ◽  
By Products

Trihalomethanes (THMs) are toxic disinfection by-products, formed in the reaction of chlorine with organic matter. This work aimed to study THM formation during a unique case study of managed aquifer recharge (MAR) with chlorinated desalinated seawater. THM formation was tested in the field, along a 3.0 m deep vadose zone gallery. Two small-scale experiments were conducted in the site, with untreated and with bromide spiked desalinated seawater. These were accompanied by a large-scale, ~1-month long operational MAR event. In the small-scale experiments, THM concentrations were shown to increase with bromide concentrations, with increasing dominance of the brominated species. Nevertheless, concentrations remained within the single µg/L range, which is an order of magnitude lower than drinking water regulations. Such low THM concentrations were also determined in the large-scale event. In both cases, THM formation occurred in the ponding water, without significant formation or degradation in the upper 3.0 m of the vadose zone. This study shows that MAR with chlorinated (<0.5 mg/L) desalinated seawater through sandy infiltration basins does not pose a threat to drinking water quality at this site.

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