Download or read book Reservoir Sedimentation in Dryland Catchments Modelling and Management written by George Leite Mamede and published by . This book was released on 2008 with total page 97 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Measurement and Modelling of Water and Sediment Fluxes in Meso scale Dryland Catchments written by Till Konrad Otto Francke and published by . This book was released on 2009 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Reservoir Sedimentation written by Anton J. Schleiss and published by CRC Press. This book was released on 2014-08-12 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt: Despite the mechanisms of reservoir sedimentation being well known for a long time, sustainable and preventive measures are rarely taken into consideration in the design of new reservoirs. To avoid operational problems of powerhouses, sedimentation is often treated for existing reservoirs with measures which are efficient only for a limited time.Th

Download or read book Reservoir Sedimentation written by Kumkum Bhattacharyya and published by CRC Press. This book was released on 2019-01-03 with total page 343 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reservoir Sedimentation: Assessment and Environmental Controls appraises the issues of sedimentation in reservoirs and discusses measures that can be employed for the effective management of sediment to prolong the operational life of reservoirs. It provides information for professional consultants and policymakers to enable them to manage dams in the best possible way, in order to ensure their sustainability as well as the sustainability of water resources in general. It examines the effects of anthropogenic intervention and management of sediment in dams and reservoirs, as water resources become more sensitive and the demand for clean water continues to increase. Features: Examines the issue of sedimentation in dams and reservoirs and presents water management strategies to alleviate environmental issues Presents methods to help ensure the environmental sustainability of dams and reservoirs, as well as the sustainability of water resources- with consideration of climate change and increased demand Illustrates the spatial distribution of sedimentation characteristics for several dams using geographic information systems (GIS) Explains the relationships between loss in capacity and catchment characteristics Examines regional variation in sediment yield, defines geomorphic regions on the basis of similar hydrometeorology, physiography, geology, and vegetation affecting reservoirs

Download or read book Reservoir Sedimentation Handbook written by Gregory L. Morris and published by McGraw Hill Professional. This book was released on 1998 with total page 864 pages. Available in PDF, EPUB and Kindle. Book excerpt: Focusing on reservoir sedimentation management and control, this work defines the nature and severity of sedimentation, reviews relevant physical processes, describes techniques used to combat sedimentation, and presents detailed case studies.

Download or read book Reservoir Sedimentation written by G.W. Annandale and published by Elsevier. This book was released on 1987-01-01 with total page 233 pages. Available in PDF, EPUB and Kindle. Book excerpt: Research on reservoir sedimentation in recent years has been aimed mainly at water resources projects in developing countries. These countries, especially in Africa, often have to cope with long droughts, flash floods and severe erosion problems. Large reservoir capacities are required to capture water provided by flash floods so as to ensure the supply of water in periods of drought. The problem arising however is that these floods, due to their tremendous stream power, carry enormous volumes of sediment which, due to the size of reservoirs, are virtually deposited in toto in the reservoir basin, leading to fast deterioration of a costly investment. Accurate forecasting of reservoir behaviour is therefore of the utmost importance.This book fills a gap in current literature by providing in one volume comprehensive coverage of techniques required to practically investigate the effects sediment deposition in reservoirs has on the viability of water resources projects. Current techniques for practically estimating sediment yield from catchments, estimating the volume of sediment expected to deposit in reservoirs, predicting sediment distribution and calculating scour downstream of reservoirs are evaluated and presented. The liberal use of diagrams and graphs to explain the various techniques enhances understanding and makes practical application simple. A major feature of the book is the application of stream power theory to explain the process of reservoir sedimentation and to develop four new methods for predicting sediment distribution in reservoirs.The book is primarily directed at practising engineers involved in the planning and design of water resources projects and at post-graduate students interested in this field of study.

Download or read book Reservoir Sediment Management written by Sahnaz Tigrek and published by CRC Press. This book was released on 2011-09-15 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt: Siltation in reservoirs has become an important problem when dams are getting older and stop functioning when the sediment has accumulated to a certain extent. With proper sediment management techniques, negative effects of sediment can be avoided and reservoir life and performance can be improved. This volume deals with reservoir sedimentation, deposition and removal. It provides the principles of sediment transport and gives guidelines to predict reservoir life. It presents several removal techniques, accompanied with detailed operation descriptions. With the help of the RESCON open source software, cost analysis tools to determine the optimum method for maintenance and operation of a reservoir can be applied. To illustrate practice and to assist the reader in setting up a sediment management operation, a number of case studies of existing large dams are included. Written by two experts on reservoir operation, this volume is intended for professionals and advanced students working on dam and reservoir design, construction, operation, maintenance and rehabilitation.

Download or read book Dryland Rivers written by L. J. Bull and published by John Wiley & Sons. This book was released on 2002-03-22 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: Examines the processes operating in the headwaters and main channels of ephemeral rivers in semi-arid environments and includes coverage of current fieldwork investigations, modeling approaches, and management issues. focuses on dryland channel networks and processes presents a historical framework for research discusses examples of current studies and evaluates contemporary modelling approaches Emphasis is on the Mediterranean region, with comparisons to other dryland regimes eg California, Australia, Chile.

Download or read book Sediment Dynamics in a Dryland River written by Franklin Jacob Dekker and published by . This book was released on 2012 with total page 73 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dryland rivers are fundamentally different from humid rivers because large infrequent floods often set channel form and sediment grain size patterns for long periods of time. The large natural variability in dryland river stream flow causes susceptibility to geomorphic alteration when they are dammed. Cosmogenic nuclide analysis, a tool for determining catchment-wide erosion rates and addressing associated geomorphic questions, has seen few applications to large dryland rivers and dammed rivers. Here, three questions are addressed concerning dam effects on sediment supply and grain size: (1) What is the downstream extent of dam effects on sediment supply, as a function of both supply reductions from the upstream watershed and supply from downstream tributaries? (2) what is the pattern of grain size in a dryland river, downstream of a dam, and (3) how do valley confinement and tributaries control that pattern? The Bill Williams River (BWR) in western Arizona is dammed by Alamo Dam and is well suited to addressing these questions. Twenty cosmogenic nuclide samples were collected in the mainstem of the BWR upstream and downstream of the Alamo Dam and from tributaries downstream of the dam. Grain size data were also collected upstream and downstream of Alamo Dam with 70 bulk samples, 18 pebble counts and 411 grain size photos. Cosmogenic nuclide analysis revealed that erosion rates vary considerably in the BWR watershed between the upper catchment (136 t/km^2/yr^1) and tributaries downstream of Alamo Dam (45.5 t/km^2/yr^1). Mixing equations showed that sediments from large dryland catchments were well mixed and nuclide concentrations could determine dam effects. However, nuclide concentrations were small in the mainstem of the BWR, and additional data are needed to adequately determine the downstream extent of dam effects. Grain size was coarsest immediately downstream of Alamo Dam (D50= 41 mm) but fined exponentially downstream. Tributary confluence effects had no statistically significant effect on mainstem grain sizes; it is possible their ephemeral flow does not yield enough sediment to have grain size effects. Wide floodplain reaches appeared to have a fining effect on grain size but were not a significant predictor of grain size.

Download or read book Integrated Catchment Modelling of Sedimentation Processes of Reservoirs a Case Study of the Welbedacht Reservoir South Africa written by Dunisani Thomas Chabalala and published by . This book was released on 2014 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt: Discusses the main objective of this research was to investigate and develop an integrated catchment modelling of sedimentation processes and management for the Welbedacht reservoir. The specific objectives of the study were: 1. to determine the various sources and rates of sediment transport.; 2. to develop a model for integrated catchment sedimentation processes and 3. to apply the model developed in (2) in order to design integrated catchment sedimentation management strategies for the Welbedacht reservoir.

Download or read book HEC 6 written by and published by . This book was released on 1995 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Geomorphology of Desert Environments written by Anthony J. Parsons and published by Springer Science & Business Media. This book was released on 2009-03-20 with total page 824 pages. Available in PDF, EPUB and Kindle. Book excerpt: About one-third of the Earth’s land surface experiences a desert climate, and this area supports approximately 15% of the planet’s population. This percentage continues to grow, and with this growth comes the need to acquire and apply an understanding of desert geomorphology. Such an understanding is vital in managing scarce and fragile resources and in mitigating natural hazards. This authoritative reference book is comprehensive in its coverage of the geomorphology of desert environments, and is arranged thematically. It begins with an overview of global deserts, proceeds through treatments of weathering, hillslopes, rivers, piedmonts, lake basins, and aeolian surfaces, and concludes with a discussion of the role of climatic change. Written by a team of international authors, all of whom are active in the field, the chapters cover the spectrum of desert geomorphology.

Download or read book Reservoir Siltation in Ethiopia written by Lulseged Tamene Desta and published by Cuvillier Verlag. This book was released on 2005 with total page 219 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 898 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Sustainable Reservoir Management Approaches Under Impacts of Climate Change A Case Study of Mangla Reservoir Pakistan written by Muhammad Adnan Khan and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reservoir sedimentation is a major issue for water resource management around the world. It has serious economic, environmental, and social consequences, such as reduced water storage capacity, increased flooding risk, decreased hydropower generation, and deteriorated water quality. Increased rainfall intensity, higher temperatures, and more extreme weather events due to climate change are expected to exacerbate the problem of reservoir sedimentation. As a result, sedimentation must be managed to ensure the long-term viability of reservoirs and their associated infrastructure. Effective reservoir sedimentation management in the face of climate change necessitates an understanding of the sedimentation process and the factors that influence it, such as land use practices, erosion, and climate. Monitoring and modelling sedimentation rates are also useful tools for forecasting future impacts and making management decisions.The goal of this research is to create long-term reservoir management strategies in the face of climate change by simulating the effects of various reservoir-operating strategies on reservoir sedimentation and sediment delta movement at Mangla Reservoir in Pakistan (the second-largest dam in the country). In order to assess the impact of the Mangla Reservoir's sedimentation and reservoir life, a framework was developed. This framework incorporates both hydrological and morphodynamic models and various soft computing models. In addition to taking climate change uncertainty into consideration, the proposed framework also incorporates sediment source, sediment delivery, and reservoir morphology changes. Furthermore, the purpose of this study is to provide a practical methodology based on the limited data available.In the first phase of this study, it was investigated how to accurately quantify the missing suspended sediment load (SSL) data in rivers by utilizing various techniques, such as sediment rating curves (SRC) and soft computing models (SCMs), including local linear regression (LLR), artificial neural networks (ANN) and wavelet-cum-ANN (WANN). Further, the Gamma and M-test were performed to select the best-input variables and appropriate data length for SCMs development. Based on an evaluation of the outcomes of all leading models for SSL estimation, it can be concluded that SCMs are more effective than SRC approaches. Additionally, the results also indicated that the WANN model was the most accurate model for reconstructing the SSL time series because it is capable of identifying the salient characteristics in a data series.The second phase of this study examined the feasibility of using four satellite precipitation datasets (SPDs) which included GPM, PERSIANN_CDR, CHIRPS, and CMORPH to predict streamflow and sediment loads (SL) within a poorly gauged mountainous catchment, by employing the SWAT hydrological model as well as SWAT coupled soft computing models (SCMs) such as artificial neural networks (SWAT-ANN), random forests (SWAT-RF), and support vector regression (SWAT-SVR). SCMs were developed using the outputs of un-calibrated SWAT hydrological models to improve the predictions. The results indicate that during the entire simulation, the GPM shows the best performance in both schemes, while PERSIAN_CDR and CHIRPS also perform well, whereas CMORPH predicts streamflow for the Upper Jhelum River Basin (UJRB) with relatively poor performance. Among the best GPM-based models, SWAT-RF offered the best performance to simulate the entire streamflow, while SWAT-ANN excelled at simulating the SL. Hence, hydrological coupled SCMs based on SPDs could be an effective technique for simulating streamflow and SL, particularly in complex terrain where gauge network density is low or uneven.The third and last phase of this study investigated the impact of different reservoir operating strategies on Mangla reservoir sedimentation using a 1D sediment transport model. To improve the accuracy of the model, more accurate boundary conditions for flow and sediment load were incorporated into the numerical model (derived from the first and second phases of this study) so that the successive morphodynamic model could precisely predict bed level changes under given climate conditions. Further, in order to assess the long-term effect of a changing climate, a Global Climate Model (GCM) under Representative Concentration Pathways (RCP) scenarios 4.5 and 8.5 for the 21st century is used. The long-term modelling results showed that a gradual increase in the reservoir minimum operating level (MOL) slows down the delta movement rate and the bed level close to the dam. However, it may compromise the downstream irrigation demand during periods of high water demand. The findings may help the reservoir managers to improve the reservoir operation rules and ultimately support the objective of sustainable reservoir use for societal benefit.In summary, this study provides comprehensive insights into reservoir sedimentation phenomena and recommends an operational strategy that is both feasible and sustainable over the long term under the impact of climate change, especially in cases where a lack of data exists. Basically, it is very important to improve the accuracy of sediment load estimates, which are essential in the design and operation of reservoir structures and operating plans in response to incoming sediment loads, ensuring accurate reservoir lifespan predictions. Furthermore, the production of highly accurate streamflow forecasts, particularly when on-site data is limited, is important and can be achieved by the use of satellite-based precipitation data in conjunction with hydrological and soft computing models. Ultimately, the use of soft computing methods produces significantly improved input data for sediment load and discharge, enabling the application of one-dimensional hydro-morphodynamic numerical models to evaluate sediment dynamics and reservoir useful life under the influence of climate change at various operating conditions in a way that is adequate for evaluating sediment dynamics.

Download or read book Manual on Sediment Management and Measurement written by Xiaoqing Yang and published by World Meteorological Organization. This book was released on 2003 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report covers a wide range of issues related to sedimentation. Its objectives are to present to readers a basic understanding of operational methods of sediment transport measurement, and serve as a practical reference in dealing with sedimentation engineering.--Publisher's description.

Download or read book Modelling Nature based Solutions written by Neil Sang and published by Cambridge University Press. This book was released on 2020-03-12 with total page 379 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book will help decision makers model nature-based solutions to the complex problem of sustainable development, locally and globally.