USGS

Geomorphic and Vegetative Recovery Processes Along Modified Stream Channels of West Tennessee

U.S. Geological Survey, Open-File Report 91-502

by Andrew Simon and C.R. Hupp


Table of Contents

Abstract

Introduction

Historical background

Purpose and scope

Study area

Acknowledgments

Consequences of channel modifications

Channel adjustment--general

Vegetation response

Examples from West Tennessee studies

Channel bed-level adjustments

Lateral adjustments

Methods of investigation

Site selection

Data collection, compilation, and analysis

Channel morphology

Channel-bed elevations

Channel width, bank height, and bank angles

Volumetric changes in channel size

Geomorphic surfaces and stage identification

Shear strength and bank stability

Analysis of bank stability

Factors of safety

Critical-bank conditions

Dendrogeomorphic analyses

Channel widening

Bank accretion

Woody vegetative cover

Timing of restabilizing bank conditions

plant ecology analyses

Detailed accretion analyses

Geomorphic and vegetative recovery processes

Channel bed-level changes

Theoretical considerations

Empirical data by river mile

Degradation

Aggradation

Bank processes and evolution

Bank-material properties

Bank evolution--general

Stage I - premodified

Stage II - constructed

Stage III - degradation

Stage IV - threshold

Rotational compared against planar failures

Stage V - aggradation

Stage VI - restabilization

Critical bank conditions

Channel widening

Recent widening

Total widening

Volumes of bank erosion

Projected widening

Obion-Forked Deer River Forks

Obion River main stem

Cane Creek

Wolf River

Cub and Porters Creeks

Hoosier and Pond Creeks

System-wide channel recovery--from dendrogeomorphic and plant ecological evidence

Bank-stability index

Accretion and channel pattern

Development of long-term channel geometry

Riparian-vegetation recovery

Species distribution--six-stage model

Vegetation recovery and life history

Species ordination

Summary and conclusions

Selected references

 


 

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