طراحی هیدرولیکی سرریزهای لابیرنتی

This comprehensive handbook on the hydraulic design of labyrinth spillways - from theory to current practice - presents a state-of-the-art method for the effective design of labyrinth weirs. The book first provides a fundamental understanding of the theory of labyrinth weirs and continues with detailed sections on significant factors that affect the discharge characteristics of labyrinth weirs such as crest shape, weir height, and sidewall angle. The most common design curves are discussed, and from these a recommendation is developed for only one design curve to be used in future designs. But because site conditions often vary so much from the idealized conditions described in this book, a section on site-specific modeling criteria is included for making accurate predictions of prototype performance. In its review of past studies, the book closely examines many long held concepts, especially concerning the idea of interference, nappe oscillation, and the definition of which head to use in design computations, and revises them in an effort to advance current thinking based on the latest research. With its review of theoretical concepts and its straightforward presentation of the practical aspects of design, both practicing engineers and researchers will find this book to be a ''must-have'' reference for the hydraulic design of labyrinth weirs. The chapters include: Analytic Development; Nappe Interference; Crest Shapes; Design Curves; Downstream Chute; Nappe Oscillation; Design; Sedimentation and Ice; Aeration; Special Cases; and Model Studies. To help guide the designer, an appendix provides a representative sample of the prototype installations and their dimensions that have been constructed worldwide MuPDF error: syntax error: invalid key in dict MuPDF error: syntax error: invalid key in dict MuPDF error: syntax error: invalid key in dict MuPDF error: syntax error: invalid key in dict MuPDF error: syntax error: invalid key in dict MuPDF error: syntax error: invalid key in dict MuPDF error: syntax error: invalid key in dict MuPDF error: syntax error: invalid key in dict MuPDF error: syntax error: invalid key in dict Contents 8 Preface 4 Nomenclature 5 Chapter 1: Introduction 12 Purpose 12 Types of Spillways 12 Flow Characteristics 17 Other Purposes 17 Previous Installations 18 Chapter 2: Analytic Development 20 Approaches 20 Side Channel Spillways 20 Equations of Motion 20 Skew Weirs 26 Labyrinth Weirs 27 Conclusions 27 Chapter 3: Nappe Interference 30 Introduction 30 Theory 31 Model Studies 35 Chapter 4: Crests Shapes 42 Types of Crests 42 Theoretical Minimum Value of the Discharge Coefficient 43 Discharge Characteristics 43 Sharp Crest and Flat Top Profile 43 Quarter-Round Profile 44 Half-Round Profile 45 Nappe Profile or Ogee Crest Profile 48 Chapter 5: Design Curves 52 Introduction 52 Basic Parameters 53 Definition of Upstream Head 54 Design Curves Derived from Model Studies 55 Taylor 55 Darvas 58 Megalháes and Lorena 60 Lux 61 Tullis et al. 64 Example Computations 65 Critique of Design Curves 67 Chapter 6: Downstream Chute 72 Introduction 72 Supercritical Waves 72 Aprons 75 Submergence 78 Chapter 7: Nappe Oscillation 80 Introduction 80 Nappe Vibration 80 Case Study 81 Surging Flows 85 Conclusions 86 Chapter 8: Design 88 Significant Parameters 88 General Guidelines for Parameter Selection 88 Headwater Ratio 88 Vertical Aspect Ratio/Sidewall Angle 88 Magnification Ratio 89 Sidewall Angle/Magnification 89 Efficacy 90 Apex Ratio 92 Crest Shape 93 Interference Length Ratio 93 Approach Flow Conditions 93 Downstream Channel 95 Layout and Quantities 95 Design Procedure 99 Steps 99 Spreadsheet 100 Chapter 9: Sedimentation and Ice 106 Sedimentation Fundamentals 106 Boardman 107 Hellsgate 108 Garland Power Canal 109 Conclusions 111 Ice 111 Chapter 10: Aeration 114 Introduction 114 Theory 115 Falling Jet Types 115 Performance 117 Conclusions 118 Chapter 11: Special Cases 120 Introduction 120 FusegatesTM 120 Detention Dams 124 Sheet Piling 126 Chapter 12: Modeling Procedures 130 Introduction 130 Systematic Errors 130 Scale Effects Caused by Surface Tension 130 Method of Operation 132 Random Errors 134 Conclusions 135 Application 135 Case Study 136 Appendix A 142 Appendix B 156 Bibliography 160 Index 172 A 172 B 172 C 172 D 172 E 172 F 172 G 172 H 172 I 173 J 173 K 173 L 173 M 173 N 173 O 173 P 173 Q 173 R 173 S 173 T 173 U 173 V 173 W 173 Annotation A labyrinth weir is a series of duckbill spillways for controlling the flow of water over a dam or channel. This slim volume compares the crest shapes used on weirs, identifies considerations for designing downstream chutes and dealing with sedimentation, explores general guidelines for parameter selection, and offers an Excel spreadsheet for performing calculations. The advanced level of the book makes it most appropriate for practicing engineers. Annotation (c)2003 Book News, Inc., Portland, OR (booknews.com) Dealing with the hydraulic design of labyrinth spillways, this book presents a method for the design of labyrinth weirs. It provides a fundamental understanding of the theory of labyrinth weirs, and includes sections on factors that affect the discharge characteristics of labyrinth weirs such as crest shape, weir height, and sidewall angle. Henry Falvey compiles a comprehensive handbook on the hydraulic design of labyrinth spillways -- from theory to current practice -- and presents a state-of-the-art method for the effective design of labyrinth weirs.