Channel Stability Assessment for Flood Control Project
File : pdf, 7.7 MB, 114 pages
TOC
Chapt 1 Introduction
Purpose
Applicability
References
Explanation of Terms
General Approach
Discussion
Systematic Approach to Channel Stability
Chapt 2 Channel Stability Principles
Section I Characteristics of Channels in Erodible Materials Geomorphic Context
Common Channel Types
Channel Geometry and Processes
Section II Principles of Channel Equilibrium and Response Basic Concepts
Applicability to Flood Control Projects
Response of Channels to Altered Conditions
Channel Evolution and Geomorphic Thresholds
Chapt 3 Stability Problems with Flood Control Channels
Section I Types of Channel Modification for Flood Control
General
Clearing and Snagging
Cleanout
Enlargement
Realignment
Levees
Flood Bypass Channels
Flow Diversions
Section II Case Examples of Stability Problems
Twenty Mile Creek
Puerco River
Grapevine Spillway Channel
Snake River
Little Tallahatchie River
Red River
Sacramento River
Long Creek Basin
Tanana River
Section III Causes and Forms of Instability
General
Continuation of Pre-existing Processes, e.g., Meandering
Increased Discharges
Realignment and Channel Improvement
Flow Regulation by Reservoirs
Sediment Transport and Channel
Stability
Chapt 4 Assembly of Information for Stability Evaluation
General
Review of Historical Developments
Map and Aerial Photo Interpretation
Field Inspection
Key Points and Features
Channel and Floodplain Surveys
Streamflow and Related Data
Geologic and Geotechnical Information
Sediment Transport
Chapt 5 Evaluation of Stability
General
Levels of Detail
Technical Approaches and Their Application
Allowable Velocity and Shear Stress
Empirical Relationships for Channel Properties
Analytical Relationships for Channel Properties
Sediment Transport and Sediment Budget
Slope Stability
Meander Geometry
Basinwide Evaluation for System Rehabilitation
General Stepwise Approach
Checklist of Items to Consider
Example of Qualitative Evaluation
Chapt 6 Practical Aspects of Stability Design
General
Ranking of Flood Control Methods
Alignment and Planform
Single-Channel Streams
Multichannel Streams
Alluvial Fans
Longitudinal Profile and Grade Controls
Cross Sections and Hydraulic Capacities
Control of Meandering
Bank Protection
Control of Sediment Deposition
