Dredging Technology Book 2
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| Author | : John B. Herbich |
| Publisher | : McGraw Hill Professional |
| Total Pages | : 1522 |
| Release | : 2000 |
| Genre | : Reference |
| ISBN | : 9780071343060 |
Authoritative, up-to-date guide to dredging theory and practice. From selecting the right equipment, to evaluating environmental impact, to bidding on a project, Handbook of Dredging Engineering, Second Edition, is the last word on modern hydraulic dredging. Edited by John B. Herbich, with contributions by well-know experts in the field, the Handbook examines basic fluid mechanics; dredge pumps; dredging equipment; sediment; pipeline transport of solids; dredging methods; disposal and placement of dredged material; numerical models for predicting the fate of dredged material placed in open water; environmental effects of dredging activities; instrumentation and automation; and project planning. This vital new edition covers major advances made over the last seven years. Three chapters are new to this edition: numerical models for predicting the fate of dredged material...subaqueous capping of contaminated sediment...and removal of contaminated sediments by dredging, with illustrative case studies.
| Author | : G L M Van Der Schrieck |
| Publisher | : |
| Total Pages | : 110 |
| Release | : 2020-10-13 |
| Genre | : |
| ISBN | : |
This book is derived from chapter 5.1 of the main book "Dredging Technology Book1: The Basics". In order to keep track of things section numbers and formula numbers are kept the same as in book 1.The centrifugal pump and its drive react to changes in the valve opening as follows:1) Blocking the flow causes the pump pressure to rise, however at the same time the drive uses less fuel and delivers less power and starts to rotate faster. Generating the high pressure apparently is not a problem for the drive. 2) Increasing the flow by removing the outgoing hydraulic resistance causes higher fuelconsumption and slower rotation speed.Generating less pressure is apparently a problem for the drive.It is these phenomena that the operator and engineer must understand very well whenthey use a centrifugal pump and drive. In this book the how and why of the working of a centrifugal dredge pump with a diesel drive or electric drive is explained in detail. Following subjects are described: - Changing the impellar diameter to adapt to a changing pipeline length .- Situation at the suction side of the pump.- The "cavitation" phenomenon, which is the start of the boiling of the fluid. - The working of the diesel motor and electro motor. - The influence of the motor characteristic on the pump characteristic. The theory of an Ejector pump is described, complete with the pump characteristic and the efficiency curve. The advantage of an ejector pump is the absence of moving parts. One has to take special attention to the nozzle design and nozzle maintenance. (see Book 1 chapter 1.8) An important conclusion is the very low theoretical max pump efficiency of 29%.
| Author | : Richard Nicholas Bray |
| Publisher | : |
| Total Pages | : 434 |
| Release | : 2005 |
| Genre | : Dredging |
| ISBN | : |
| Author | : D. Eisma |
| Publisher | : CRC Press |
| Total Pages | : 272 |
| Release | : 2005-12-22 |
| Genre | : Technology & Engineering |
| ISBN | : 9780415391115 |
The varied use of dredgers has led to the development of a variety of dredger types, from small ones appropriate to modest inshore projects, to very large sea-going dredgers for large-scale projects calling for the storage of dredged material within the ship. This book, which is the first book dedicated to dredging and its environmental impact in the widest sense, contains chapters on dredging operations in the Netherlands, Belgium, the UK, Spain, the US, China and Singapore. Additional chapters discuss more general aspects such as dredging techniques, monitoring of dredging operations, and the prospects of dredging in a changing environment. As well as providing information on dredging activities in different areas, it gives an insight into the activities and problems (environmental or other) involved in modern dredging. It will be of interest to professionals and students alike.
| Author | : G. L. M. van der Schrieck |
| Publisher | : |
| Total Pages | : 106 |
| Release | : 2021-10 |
| Genre | : |
| ISBN | : |
This is the 2021 issue of book 2 of my series on Dredging Technology. It is a compact reference manual for project engineers involved in large scale land and water projects. As a project owner or project engineer this kind of short reference books will help you in the field. The book describes a lot of relevant technical processes that determine the progress and profitability of your project. Subjects: -Basic Soil Mechanics -Basic Fluid Mechanics for Pumps and Waterjets. -Stability calculations for Pontoons -Optimising large scale Pump Process -Basic Electric Theory and practical applications -Production of large scale floating Equipment -Loading a Trailing Suction Hopper Dredge
| Author | : Jan van 't Hoff |
| Publisher | : CRC Press |
| Total Pages | : 674 |
| Release | : 2012-12-18 |
| Genre | : Science |
| ISBN | : 0415698448 |
Without proper hydraulic fill and suitable specialised equipment, many major infrastructure projects such as ports, airports, roads, industrial or housing projects could not be realised. Yet comprehensive information about hydraulic fill is difficult to find. This thoroughly researched book, written by noted experts, takes the reader step-by-step through the complex development of a hydraulic fill project. Up-to-date and in-depth, this manual will enable the client and his consultant to understand and properly plan a reclamation project. It provides adequate guidelines for design and quality control and allows the contractor to work within known and generally accepted guidelines and reasonable specifications. The ultimate goal is to create better-designed, more adequately specified and less costly hydraulic fill projects. The Hydraulic Fill Manual covers a range of topics such as: • The development cycle of a hydraulic fill project • How technical data are acquired and applied • The construction methods applicable to a wide variety of equipment and soil conditions, the capabilities of dredging equipment and the techniques of soil improvement • How to assess the potentials of a borrow pit • Essential environment assessment issues • The design of the hydraulic fill mass, including the boundary conditions for the design, effects of the design on its surroundings, the strength and stiffness of the fill mass, density, sensitivity to liquefaction, design considerations for special fill material such as silts, clays and carbonate sands, problematic subsoils and natural hazards • Quality control and monitoring of the fill mass and its behaviour after construction. This manual is of particular interest to clients, consultants, planning and consenting authorities, environmental advisors, contractors and civil, geotechnical, hydraulic and coastal engineers involved in dredging and land reclamation projects.
| Author | : Gerard Van Der Schrieck |
| Publisher | : |
| Total Pages | : 48 |
| Release | : 2020-09-16 |
| Genre | : |
| ISBN | : |
The Quick Reference Guide: This reference guide is book 2 from a series of Dredging Technology related books and contains the basic theories and formula's a project engineer needs when acting in the field of dredging projects. It serves as a quick and compact reminder of theories and formulas he needs during preparation, excecution and possibly the handling of a claim during dredging project. The guide is compact and meant to be used on-site. The emphasis of this guide lies on quickly reminding the subjects and being able to quantify the parameters involved. However should there be a need for a more extensive description than a refer is made to the main textbook "Dredging Technology". This guide starts with the basic soilmechanic concepts and formulas which are relevant for any dredging project, such as: Soil stability (retaining walls and quick sand condition), compaction and dilatancy (slope stability and cutting forces) . Next the basic fluid mechanic parameters, such as concentration and density, for pumping soil and water are described and also the parameters of waterjets . Formula's for Pump Production calculation and Degree of Loading of a Hopperdredge are given. The stability of a pontoon, often used on a dredging project, is explained and formula's for the calulation of the metacenterheight are described. A compact description of theories of a centrifugal dredge pump is given together with a description of the pump drive. Especially the specific impact on a centrifugal pump characteristic by a diesel drive is explained. The effect of the pipeline length on the working point and therefore on the effective use of the diesel drive is explained.The effect of a change in the pump impellar diameter or a change in the gear ratio is explained. These are real practical problems on a dredging project and therefore a general procedure for solving a pump question is given. The suction process with the vacuum and the limiting vacuum and cavitation at the pump entrance is described. This is the most important part of the hydraulic transport process, since it is the starting point of the soil volume production in cubic meter per hour when using a suction dredger. The vacuum production is analysed resulting in an optimisation of the suction production. A compact description of an electric generator and motor is given and the difference between DC and AC is explained. The three phase alternating current motor is explained and also the principle of the "Electrical Shaft" is explained. Finally production calculation formula's are given for a cutter suction dredger (CSD) and a trailing suction hopper dredger (TSHD).
| Author | : S.A. Miedema |
| Publisher | : IOS Press |
| Total Pages | : 572 |
| Release | : 2014-10-29 |
| Genre | : Technology & Engineering |
| ISBN | : 1614994544 |
Sand, clay and rock have to be excavated for a variety of purposes, such as dredging, trenching, mining (including deep sea mining), drilling, tunnel boring and many other applications. Many excavations take place on dry land, but they are also frequently required in completely saturated conditions, and the methods necessary to accomplish them consequently vary widely. This book provides an overview of cutting theories. It begins with a generic model, valid for all types of soil (sand, clay and rock), and continues with the specifics of dry sand, water-saturated sand, clay, atmospheric rock and hyperbaric rock. Small blade angles and large blade angles are discussed for each soil type, and for each case considered the equations/model for cutting forces, power and specific energy are given. With models verified by laboratory research, principally from the Delft University of Technology, and data from other recognized sources, this book will prove an invaluable reference for anybody whose work involves major excavations of any kind.
| Author | : Vince Beiser |
| Publisher | : Penguin |
| Total Pages | : 306 |
| Release | : 2019-08-06 |
| Genre | : Science |
| ISBN | : 0399576444 |
A finalist for the PEN/E. O. Wilson Literary Science Writing Award The gripping story of the most important overlooked commodity in the world--sand--and the crucial role it plays in our lives. After water and air, sand is the natural resource that we consume more than any other--even more than oil. Every concrete building and paved road on Earth, every computer screen and silicon chip, is made from sand. From Egypt's pyramids to the Hubble telescope, from the world's tallest skyscraper to the sidewalk below it, from Chartres' stained-glass windows to your iPhone, sand shelters us, empowers us, engages us, and inspires us. It's the ingredient that makes possible our cities, our science, our lives--and our future. And, incredibly, we're running out of it. The World in a Grain is the compelling true story of the hugely important and diminishing natural resource that grows more essential every day, and of the people who mine it, sell it, build with it--and sometimes, even kill for it. It's also a provocative examination of the serious human and environmental costs incurred by our dependence on sand, which has received little public attention. Not all sand is created equal: Some of the easiest sand to get to is the least useful. Award-winning journalist Vince Beiser delves deep into this world, taking readers on a journey across the globe, from the United States to remote corners of India, China, and Dubai to explain why sand is so crucial to modern life. Along the way, readers encounter world-changing innovators, island-building entrepreneurs, desert fighters, and murderous sand pirates. The result is an entertaining and eye-opening work, one that is both unexpected and involving, rippling with fascinating detail and filled with surprising characters.
| Author | : National Research Council |
| Publisher | : National Academies Press |
| Total Pages | : 137 |
| Release | : 2002-08-09 |
| Genre | : Science |
| ISBN | : 0309083400 |
Concerns over the potential ecological effects of fishing have increased with the expansion of fisheries throughout the marine waters of the United States. Effects of Trawling and Dredging on Seafloor Habitat describes how assessment of fishing impacts depends on gear type, number and location of bottom tows, and the physical and biological characteristics of seafloor habitats. Many experimental studies have documented acute, gear-specific effects of trawling and dredging on various types of habitat. These studies indicate that low mobility, long-lived species are more vulnerable to towed fishing gear than short-lived species in areas where the seabed is often disturbed by natural phenomena. Trawling and dredging may also change the composition and productivity of fish communities dependent on seafloor habitats for food and refuge. The scale of these impacts depends on the level of fishing effort. This volume presents color maps of fishing effort for all regions with significant bottom trawl or dredge fisheries-the first time that such data has been assembled and analyzed for the entire nation.
