Download or read book A Full scale Simulation Study of Stochastic Water Demands on Distribution System Transport written by Xueyao Yang and published by . This book was released on 2010 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: Typical network modeling in distribution system analysis assumes the water demands are known and constant over 1 hour. However, as utilities move towards "all-pipe" network models, continuing to ignore the stochastic water demands may not adequately account for the impacts of demand variability on the underlying transport and water quality characteristics. The objective of this research is to evaluate the potential impacts of different levels of temporal aggregation of water demands on the underlying hydraulic, transport, and water quality simulations for both a small network and a large "all-pipe" network system. A non-homogeneous Poisson Rectangular Pulse model was used to generate stochastic water demands aggregated at 1-min, 10-min, and 1-hr time steps, and linked with EPANET to perform hydraulic and water quality simulations. The impacts of the three temporal aggregations of water demands were evaluated with respect to: 1) hydraulics by evaluating pressure and flow rate variability; 2) transport and water quality characteristics using "conservative chemical intrusion" events and evaluating transport times and cumulative mass. Additional studies were performed to interpret the chemical analysis within a risk analysis framework, and investigated the impact of temporal aggregation with different injection durations. For a small skeletonized network, results showed for main trunk lines, the demand variability had little influence on the flow rate, chemical concentration, and risk assessment. However, as dead end nodes or pipes were analyzed, there was an increase in the flow rate variability with decreasing temporal aggregation that impacted the chemical concentration time series and risk assessment by altering the travel paths and times. For the large "all-pipe" network model, the results illustrated a greater frequency in flow reversals as well as meaningful differences in the initial arrival time and half-mass arrival time of chemical with decreasing temporal aggregation scales. Upon analyzing the Monte Carlo ensemble of results, the majority of nodes that resulted in meaningful initial chemical arrival time differences tended to be located at the edges of the network. With respect to the half-mass arrival time, a spatial analysis indicated there were a number of nodes within a blending region that had meaningful differences within a majority of the Monte Carlo realizations. Finally, a comparison of the stochastic water demand simulations to the original deterministic simulation indicated that the intra-hour variability resulting from the stochastic demands was more important than the variability resulting from the temporal aggregation scale. The results associated with a risk assessment also showed meaningful differences in the time until 1% and 50% of the population at a node infected by a toxic chemical between the shorter temporal aggregation scales and the 1-hr case. The impacts of injection duration illustrated the injection duration had little impact on the initial chemical arrival time. However, decreasing the injection duration had greater impacts on the differences of half-mass chemical arrival time and cumulative mass between the 10-min and 1-hr aggregation cases. These results indicate that there are portions of a distribution system where the typical network modeling assumptions may not be appropriate to adequately represent localized transport.
Download or read book Stochastic Water Demand Modelling written by Mirjam Blokker and published by IWA Publishing. This book was released on 2011-09-19 with total page 181 pages. Available in PDF, EPUB and Kindle. Book excerpt: Water quality processes in the drinking water distribution network are strongly influenced by the flow velocity and residence time of the water in the network. In order to understand how the water quality changes in the drinking water distribution network, a good understanding of hydraulics is required. Specifically in the periphery of the network, where customers are connected, the hydraulics can change rapidly. During the night time the water is almost stagnant and the residence time increases. In the morning, when everybody gets up and flushes the toilet and takes a shower, high flow velocities can occur. During the remainder of the day flow velocities are low. The stochastic endues model SIMDEUM was developed to simulate water use on a small time scale (1 s) and small spatial scale (per fixture). SIMDEUM enables a good model of flow velocities, residence times and the connected water quality processes in the water distribution network. Stochastic Water Demand Modelling: Hydraulics in Water Distribution Networks describes the requirements of hydraulics in water quality modelling and provides insight into the development of detailed residential and non-residential water demand models. The book illustrates the use of detailed demand models in water quality models with respect to the variation in residence times and the relation with particle accumulation and resuspension. The models are compared to measurements in several real drinking water distribution networks.
Download or read book Stochastic Hydrology and its Use in Water Resources Systems Simulation and Optimization written by J.B. Marco and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 470 pages. Available in PDF, EPUB and Kindle. Book excerpt: Stochastic hydrology is an essential base of water resources systems analysis, due to the inherent randomness of the input, and consequently of the results. These results have to be incorporated in a decision-making process regarding the planning and management of water systems. It is through this application that stochastic hydrology finds its true meaning, otherwise it becomes merely an academic exercise. A set of well known specialists from both stochastic hydrology and water resources systems present a synthesis of the actual knowledge currently used in real-world planning and management. The book is intended for both practitioners and researchers who are willing to apply advanced approaches for incorporating hydrological randomness and uncertainty into the simulation and optimization of water resources systems. (abstract) Stochastic hydrology is a basic tool for water resources systems analysis, due to inherent randomness of the hydrologic cycle. This book contains actual techniques in use for water resources planning and management, incorporating randomness into the decision making process. Optimization and simulation, the classical systems-analysis technologies, are revisited under up-to-date statistical hydrology findings backed by real world applications.
Download or read book Integrating Water Systems written by Joby Boxall and published by CRC Press. This book was released on 2009-07-24 with total page 834 pages. Available in PDF, EPUB and Kindle. Book excerpt: A collection of articles by leading international experts on modeling and control of potable water distribution and sewerage collection systems, focusing on advances in sensors, instrumentation and communications technologies; assessment of sensor reliability, accuracy and fitness; data management including SCADA and GIS; system
Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1991 with total page 962 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Parameter Estimation and Uncertainty Quantification in Water Resources Modeling written by Philippe Renard and published by Frontiers Media SA. This book was released on 2020-04-22 with total page 177 pages. Available in PDF, EPUB and Kindle. Book excerpt: Numerical models of flow and transport processes are heavily employed in the fields of surface, soil, and groundwater hydrology. They are used to interpret field observations, analyze complex and coupled processes, or to support decision making related to large societal issues such as the water-energy nexus or sustainable water management and food production. Parameter estimation and uncertainty quantification are two key features of modern science-based predictions. When applied to water resources, these tasks must cope with many degrees of freedom and large datasets. Both are challenging and require novel theoretical and computational approaches to handle complex models with large number of unknown parameters.
Download or read book Peterson s Guide to Graduate Programs in Engineering and Applied Sciences written by and published by . This book was released on 1986 with total page 1110 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1991 with total page 1210 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Water Resources Research Catalog written by United States. Office of Water Research and Technology and published by . This book was released on 1976 with total page 1046 pages. Available in PDF, EPUB and Kindle. Book excerpt: Beginning with vol. 9, only new and continuing but modified projects are listed. Vols. 8- should be kept as a record of continuing but unchanged projects.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energy Research Abstracts written by and published by . This book was released on 1994-06 with total page 544 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bibliography of Agriculture written by and published by . This book was released on 1975 with total page 1922 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Assessment of Non Point Source Pollution in the Vadose Zone written by Dennis L. Corwin and published by American Geophysical Union. This book was released on 1999-01-26 with total page 369 pages. Available in PDF, EPUB and Kindle. Book excerpt: Published by the American Geophysical Union as part of the Geophysical Monograph Series, Volume 108. Non-point source (NPS) pollution in the vadose zone (simply defined as the layer of soil extending from the soil surface to the groundwater table) is a global environmental problem. Characteristically, NPS pollutants are widespread and occasionally ubiquitous in extent, thus making remediation efforts difficult and complex; have the potential for maintaining a relatively long active presence in the global ecosystem; and may result in long?]term, chronic health effects in humans and other life forms. Similar to other global environmental issues, the knowledge and information required to address the problem of NPS pollutants in the vadose zone cross several technological and subdisciplinary lines: spatial statistics, geographic information systems (GIS), hydrology, soil science, and remote sensing. Cooperation between disciplines and scientific societies is essential to address the problem. Evidence of such cooperation was the jointly sponsored American Geophysical Union Chapman/Soil Science Society of America (SSSA) Outreach Conference that occurred in October 1997, entitled “Applications of GIS, Remote Sensing, Geostatistics, and Solute Transport Modeling to the Assessment of Non-Point Source Pollution in the Vadose Zone.” The objective of the conference and this book, which was developed from the conference, was to explore current multidisciplinary research for assessing NPS pollution in soil and groundwater resources.
Download or read book Transactions of the American Society of Civil Engineers written by American Society of Civil Engineers and published by . This book was released on 2005 with total page 1176 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vols. 29-30 contain papers of the International Engineering Congress, Chicago, 1893; v. 54, pts. A-F, papers of the International Engineering Congress, St. Louis, 1904.
Download or read book Radioactive Waste Management written by and published by . This book was released on 1989 with total page 526 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book EPA Publications Bibliography written by United States. Environmental Protection Agency and published by . This book was released on 1985 with total page 478 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Computer Simulation 1951 1976 written by Per A. Holst and published by . This book was released on 1979 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt:
