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Author : Amin A. Elshorbagy
Publisher :
ISBN 13 :
Total Pages : 225 pages
Book Rating : 4.:/5 (184 download)
Download or read book Group-based estimation of missing hydrological data written by Amin A. Elshorbagy and published by . This book was released on 2001 with total page 225 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Group-based Estimation of Missing Hydrological Data written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Water resources planning and management require complete data sets of many variables, such as rainfall, streamflow, and temperature. Unfortunately, records of hydrologic processes are usually short and often have missing observations. Attracted by the importance of estimating missing data, hydrologic researchers have adopted and developed various models and techniques to in-fill missing data. The diversity of the adopted techniques does not necessarily indicate diversity in the approach. A major commonality exists in most of the applications of these techniques; that is, any hydrologic time series record is perceived as a sequence of single-valued observations irrespective of the time scale of the data or their underlying structure. In this research, the group approach, different from the traditional single-valued approach, is proposed. The approach perceives the periodic hydrologic data as sequence of groups rather than single-valued observations. The techniques suggested to handle the group approach, after modification, are regression, time series analysis, partitioning modeling, and artificial neural networks. Various models representing these four techniques are briefly presented and applied to single series and bi-series cases, respectively. Also group time series models are developed in this thesis for the same purpose. It turns out that the group approach is highly useful for estimating consecutive missing values, and possibly other applications, such as long-term forecast. On the other hand, in non-periodic data (e.g., daily flows) where seasonality does not play a major role and a definite number of repetitive low dimensional groups of observations cannot be found in the geophysical year, another approach of identifying and modeling groups is sought. The nonlinearity and dynamic behavior of non-periodic hydrologic data sets have been indicated in water resources literature as issues that influence the performance of modeling tools that ignore nonl nearity a.
Download or read book Group-based Estimation of Missing Hydrological Data written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Ramesh S. V. Teegavarapu
Publisher : Springer Nature
ISBN 13 : 3031609468
Total Pages : 532 pages
Book Rating : 4.0/5 (316 download)
Download or read book Imputation Methods for Missing Hydrometeorological Data Estimation written by Ramesh S. V. Teegavarapu and published by Springer Nature. This book was released on with total page 532 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
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ISBN 13 :
Total Pages : 896 pages
Book Rating : 4.F/5 ( download)
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2002 with total page 896 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Ibrahim Dincer
Publisher : Springer Science & Business Media
ISBN 13 : 1461475880
Total Pages : 1171 pages
Book Rating : 4.4/5 (614 download)
Download or read book Causes, Impacts and Solutions to Global Warming written by Ibrahim Dincer and published by Springer Science & Business Media. This book was released on 2013-10-29 with total page 1171 pages. Available in PDF, EPUB and Kindle. Book excerpt: Global Warming: Causes, Impacts and Solutions covers all aspects of global warming including its causes, impacts, and engineering solutions. Energy and environment policies and strategies are scientifically discussed to expose the best ways to reduce global warming effects and protect the environment and energy sources affected by human activities. The importance of green energy consumption on the reduction of global warming, energy saving and energy security are also discussed. This book also focuses on energy management and conservation strategies for better utilization of energy sources and technologies in buildings and industry as well as ways of improving energy efficiency at the end use, and introduces basic methods for designing and sizing cost-effective systems and determining whether it is economically efficient to invest in specific energy efficiency or renewable energy projects, and describes energy audit producers commonly used to improve the energy efficiency of residential and commercial buildings as well as industrial facilities. These features and more provide the tools necessary to reduce global warming and to improve energy management leading to higher energy efficiencies. In order to reduce the negative effects of global warming due to excessive use of fossil fuel technologies, the following alternative technologies are introduced from the engineering perspective: fuel cells, solar power generation technologies, energy recovery technologies, hydrogen energy technologies, wind energy technologies, geothermal energy technologies, and biomass energy technologies. These technologies are presented in detail and modeling studies including case studies can also be found in this book.
Author : Vijay P. Singh
Publisher : McGraw Hill Professional
ISBN 13 : 0071835105
Total Pages : 1438 pages
Book Rating : 4.0/5 (718 download)
Download or read book Handbook of Applied Hydrology, Second Edition written by Vijay P. Singh and published by McGraw Hill Professional. This book was released on 2016-03-07 with total page 1438 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fully Updated Hydrology Principles, Methods, and Applications Thoroughly revised for the first time in 50 years, this industry-standard resource features chapter contributions from a “who’s who” of international hydrology experts. Compiled by a colleague of the late Dr. Chow, Chow’s Handbook of Applied Hydrology, Second Edition, covers scientific and engineering fundamentals and presents all-new methods, processes, and technologies. Complete details are provided for the full range of ecosystems and models. Advanced chapters look to the future of hydrology, including climate change impacts, extraterrestrial water, social hydrology, and water security. Chow’s Handbook of Applied Hydrology, Second Edition, covers: · The Fundamentals of Hydrology · Data Collection and Processing · Hydrology Methods · Hydrologic Processes and Modeling · Sediment and Pollutant Transport · Hydrometeorologic and Hydrologic Extremes · Systems Hydrology · Hydrology of Large River and Lake Basins · Applications and Design · The Future of Hydrology
Author : R.S. Govindaraju
Publisher : Springer Science & Business Media
ISBN 13 : 9401593418
Total Pages : 338 pages
Book Rating : 4.4/5 (15 download)
Download or read book Artificial Neural Networks in Hydrology written by R.S. Govindaraju and published by Springer Science & Business Media. This book was released on 2013-03-09 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt: R. S. GOVINDARAJU and ARAMACHANDRA RAO School of Civil Engineering Purdue University West Lafayette, IN. , USA Background and Motivation The basic notion of artificial neural networks (ANNs), as we understand them today, was perhaps first formalized by McCulloch and Pitts (1943) in their model of an artificial neuron. Research in this field remained somewhat dormant in the early years, perhaps because of the limited capabilities of this method and because there was no clear indication of its potential uses. However, interest in this area picked up momentum in a dramatic fashion with the works of Hopfield (1982) and Rumelhart et al. (1986). Not only did these studies place artificial neural networks on a firmer mathematical footing, but also opened the dOOf to a host of potential applications for this computational tool. Consequently, neural network computing has progressed rapidly along all fronts: theoretical development of different learning algorithms, computing capabilities, and applications to diverse areas from neurophysiology to the stock market. . Initial studies on artificial neural networks were prompted by adesire to have computers mimic human learning. As a result, the jargon associated with the technical literature on this subject is replete with expressions such as excitation and inhibition of neurons, strength of synaptic connections, learning rates, training, and network experience. ANNs have also been referred to as neurocomputers by people who want to preserve this analogy.
Author : K J Gregory
Publisher : SAGE Publications Limited
ISBN 13 : 9781412907873
Total Pages : 424 pages
Book Rating : 4.9/5 (78 download)
Download or read book Physical Geography written by K J Gregory and published by SAGE Publications Limited. This book was released on 2005-10-10 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt: This four-volume set begins by examining the knowledge of physical geography: from the quantitative revolution to current state of mathematical models. The principal environment spheres – for example, the biosphere – are examined to show the greater concern with environmental dynamics now central to the discipline. This work includes studies of environmental change, looking at short term as well as longer term change, and evaluating aspects of global change. Volume IV focuses on the total physical environment, examining human activity and human impact; environmental hazards; and applied physical geography.
Author :
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ISBN 13 :
Total Pages : 808 pages
Book Rating : 4.0/5 ( download)
Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1991 with total page 808 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : D.R. Helsel
Publisher : Elsevier
ISBN 13 : 0080875084
Total Pages : 539 pages
Book Rating : 4.0/5 (88 download)
Download or read book Statistical Methods in Water Resources written by D.R. Helsel and published by Elsevier. This book was released on 1993-03-03 with total page 539 pages. Available in PDF, EPUB and Kindle. Book excerpt: Data on water quality and other environmental issues are being collected at an ever-increasing rate. In the past, however, the techniques used by scientists to interpret this data have not progressed as quickly. This is a book of modern statistical methods for analysis of practical problems in water quality and water resources. The last fifteen years have seen major advances in the fields of exploratory data analysis (EDA) and robust statistical methods. The 'real-life' characteristics of environmental data tend to drive analysis towards the use of these methods. These advances are presented in a practical and relevant format. Alternate methods are compared, highlighting the strengths and weaknesses of each as applied to environmental data. Techniques for trend analysis and dealing with water below the detection limit are topics covered, which are of great interest to consultants in water-quality and hydrology, scientists in state, provincial and federal water resources, and geological survey agencies. The practising water resources scientist will find the worked examples using actual field data from case studies of environmental problems, of real value. Exercises at the end of each chapter enable the mechanics of the methodological process to be fully understood, with data sets included on diskette for easy use. The result is a book that is both up-to-date and immediately relevant to ongoing work in the environmental and water sciences.
Author : Angela Gorgoglione
Publisher : MDPI
ISBN 13 : 3039282107
Total Pages : 94 pages
Book Rating : 4.0/5 (392 download)
Download or read book Overcoming Data Scarcity in Earth Science written by Angela Gorgoglione and published by MDPI. This book was released on 2020-05-22 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt: heavily Environmental mathematical models represent one of the key aids for scientists to forecast, create, and evaluate complex scenarios. These models rely on the data collected by direct field observations. However, assembly of a functional and comprehensive dataset for any environmental variable is difficult, mainly because of i) the high cost of the monitoring campaigns and ii) the low reliability of measurements (e.g., due to occurrences of equipment malfunctions and/or issues related to equipment location). The lack of a sufficient amount of Earth science data may induce an inadequate representation of the response’s complexity in any environmental system to any type of input/change, both natural and human-induced. In such a case, before undertaking expensive studies to gather and analyze additional data, it is reasonable to first understand what enhancement in estimates of system performance would result if all the available data could be well exploited. Missing data imputation is an important task in cases where it is crucial to use all available data and not discard records with missing values. Different approaches are available to deal with missing data. Traditional statistical data completion methods are used in different domains to deal with single and multiple imputation problems. More recently, machine learning techniques, such as clustering and classification, have been proposed to complete missing data. This book showcases the body of knowledge that is aimed at improving the capacity to exploit the available data to better represent, understand, predict, and manage the behavior of environmental systems at all practical scales.
Author :
Publisher :
ISBN 13 :
Total Pages : 204 pages
Book Rating : 4.:/5 (319 download)
Download or read book Guidelines for Determining Flood Flow Frequency written by and published by . This book was released on 1981 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Keith W. Hipel
Publisher : Springer Science & Business Media
ISBN 13 : 9401730830
Total Pages : 469 pages
Book Rating : 4.4/5 (17 download)
Download or read book Stochastic and Statistical Methods in Hydrology and Environmental Engineering written by Keith W. Hipel and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 469 pages. Available in PDF, EPUB and Kindle. Book excerpt: International experts from around the globe present a rich variety of intriguing developments in time series analysis in hydrology and environmental engineering. Climatic change is of great concern to everyone and significant contributions to this challenging research topic are put forward by internationally renowned authors. A range of interesting applications in hydrological forecasting are given for case studies in reservoir operation in North America, Asia and South America. Additionally, progress in entropy research is described and entropy concepts are applied to various water resource systems problems. Neural networks are employed for forecasting runoff and water demand. Moreover, graphical, nonparametric and parametric trend analyses methods are compared and applied to water quality time series. Other topics covered in this landmark volume include spatial analyses, spectral analyses and different methods for stream-flow modelling. Audience The book constitutes an invaluable resource for researchers, teachers, students and practitioners who wish to be at the forefront of time series analysis in the environmental sciences.
Author : Hong-Yue Zhang
Publisher : Elsevier
ISBN 13 : 9780080555393
Total Pages : 1576 pages
Book Rating : 4.5/5 (553 download)
Download or read book Fault Detection, Supervision and Safety of Technical Processes 2006 written by Hong-Yue Zhang and published by Elsevier. This book was released on 2007-03-01 with total page 1576 pages. Available in PDF, EPUB and Kindle. Book excerpt: The safe and reliable operation of technical systems is of great significance for the protection of human life and health, the environment, and of the vested economic value. The correct functioning of those systems has a profound impact also on production cost and product quality. The early detection of faults is critical in avoiding performance degradation and damage to the machinery or human life. Accurate diagnosis then helps to make the right decisions on emergency actions and repairs. Fault detection and diagnosis (FDD) has developed into a major area of research, at the intersection of systems and control engineering, artificial intelligence, applied mathematics and statistics, and such application fields as chemical, electrical, mechanical and aerospace engineering. IFAC has recognized the significance of FDD by launching a triennial symposium series dedicated to the subject. The SAFEPROCESS Symposium is organized every three years since the first symposium held in Baden-Baden in 1991. SAFEPROCESS 2006, the 6th IFAC Symposium on Fault Detection, Supervision and Safety of Technical Processes was held in Beijing, PR China. The program included three plenary papers, two semi-plenary papers, two industrial talks by internationally recognized experts and 258 regular papers, which have been selected out of a total of 387 regular and invited papers submitted. * Discusses the developments and future challenges in all aspects of fault diagnosis and fault tolerant control * 8 invited and 36 contributed sessions included with a special session on the demonstration of process monitoring and diagnostic software tools
Author : Tondani Patricia Makhuvha
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (15 download)
Download or read book The Estimation of Missing Values in Hydrological Records Using the EM Algorithm and Regression Methods written by Tondani Patricia Makhuvha and published by . This book was released on 1988 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Patrick E. McKnight
Publisher : Guilford Press
ISBN 13 : 1606238205
Total Pages : 269 pages
Book Rating : 4.6/5 (62 download)
Download or read book Missing Data written by Patrick E. McKnight and published by Guilford Press. This book was released on 2007-03-28 with total page 269 pages. Available in PDF, EPUB and Kindle. Book excerpt: While most books on missing data focus on applying sophisticated statistical techniques to deal with the problem after it has occurred, this volume provides a methodology for the control and prevention of missing data. In clear, nontechnical language, the authors help the reader understand the different types of missing data and their implications for the reliability, validity, and generalizability of a study’s conclusions. They provide practical recommendations for designing studies that decrease the likelihood of missing data, and for addressing this important issue when reporting study results. When statistical remedies are needed--such as deletion procedures, augmentation methods, and single imputation and multiple imputation procedures--the book also explains how to make sound decisions about their use. Patrick E. McKnight's website offers a periodically updated annotated bibliography on missing data and links to other Web resources that address missing data.
