Changes in channel characteristics, 1938-74, of the Homochitto River and tributaries, Mississippi

Wilson, K.V.

doi:10.3133/ofr79554

Cited by 24 publications

(17 citation statements)

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“…Data indicate that, on average, bess in Kansas and Nebraska are considerably more cohesive, ranging from 35 to 69 kPa (Turnbull, 1948;Lohnes and Handy, 1968). Cohesion and friction-angle values obtained in Mississippi for bess-derived sediments range from 9.2 to 34 kPa, and from 16 to 35°, respectively (Turnipseed and Wilson, 1992;Wilson andTurnipseed, 1993, 1994). The mean value of cohesion reported for 23 borehole shear-strength tests conducted in bess-derived sediments in northern Mississippi is relatively high, (54 kPa) by Thorne et al (1981).…”

Section: Natural Factorsmentioning

confidence: 99%

“…A survey of 15 counties in northwestern Missouri identified 957 highway structures as damaged by channel degradation. Degradation and channel widening in the bess area led to the collapse of several bridges in West Tennessee (Robbins and Simon, 1983), southwest Mississippi (Wilson, 1979), Missouri (Emerson, the midwestern United States focused additional attention on channel-stability problems in the bess area because scores of bridges were either closed or failed during and immediately after the floods.…”

Section: Introductionmentioning

confidence: 99%

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CHANNEL INSTABILITY IN THE LOESS AREA OF THE MIDWESTERN UNITED STATES¹

Simon

Rinaldi

2000

J American Water Resour Assoc

168

110

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The bess area of the midwestern United States contains thousands of miles of unstable stream channels that are undergoing system-wide channel-adjustment processes as a result of (1) modifications to drainage basins dating back to the turn of the 20th century, including land clearing and poor soil-conservation practices, which caused the filling of stream channels, and consequently (2) direct, human modifications to stream channels such as dredging and straightening to improve drainage conditions and reduce the frequency of out-of-bank flows. Today, many of these channels are still highly unstable and threaten bridges, other structures, and land adjacent to the channels. The most severe, widespread instabilities are in western Iowa where a thick cap of bess and the lack of sand-and gravel-sized bed sediments in many channels hinders downstream aggradation, bed-level recovery and the consequent reduction of bank heights, and renewed bank stability. In contrast, streams draining west-central Illinois, east-central Iowa, and other areas, where the bess cap is relatively thin and there are ample supplies of sand-and gravel-sized material, are closer to recovery. Throughout the region, however, channel widening by mass-wasting processes is the dominant adjustment process.

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Section: Natural Factorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

CHANNEL INSTABILITY IN THE LOESS AREA OF THE MIDWESTERN UNITED STATES¹

Simon

Rinaldi

2000

J American Water Resour Assoc

168

110

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“…Site 21 is on a streambed consisting of sand, which degraded about 15 ft between 1941and 1974(Wilson, 1979. By plotting the annual minimum stages through time, the bed at this with a streambed consisting of sand that has degraded about 15 ft. Also, the channel at this site has moved laterally about 790 ft northward causing as much as 49 ft of total scour on the overbank.…”

Section: Measured Total-scour Depthsmentioning

confidence: 99%

Scour at selected bridge sites in Mississippi

Wilson¹

1995

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“…Other examples can be found that describe bridge failures following channel modifications that caused accelerated channel instability (e.g. see Ruhe (1970); Emerson (1971); Wilson (1979) and Simon (1989Simon ( , 1992). Similar examples can be found in other parts of the world.…”

Section: Introductionmentioning

confidence: 99%

Physiographic characteristics of bridge‐stream intersections

Johnson

2006

River Research & Apps

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Bridges that cross streams can be greatly affected by channel instabilities, such as channel widening, lateral migration and channel bed degradation. Attention to channel conditions in the vicinity of bridges is an important aspect of bridge maintenance and safety. Channel stability is also critical to goals of multi-objective river management. Given that channel stability is important for both river management and the structural stability of bridges, any river management scheme should consider the stability of bridge-stream intersections. In this paper, the characteristics of bridge-stream intersections across the United States are described based on existing literature and recent field observations. A set of recommendations for addressing and improving channel stability at bridges is suggested, including: (1) controlling water and sediment discharges at the catchment level; (2) revegetating channel banks with woody vegetation; (3) reshaping the channel cross-section to a more stable, configuration; (4) removing disturbances from the stream channel, such as cattle and (5) using structures to control flow near channel beds and banks. The physiographic setting is a factor in the solution of at least the first three suggestions in this list. Attention to the physical characteristics of bridge-stream intersections in the various physiographic regions can lead to sustainable solutions for stabilizing channels at bridge-stream intersections.

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Changes in channel characteristics, 1938-74, of the Homochitto River and tributaries, Mississippi

Cited by 24 publications

References 0 publications

CHANNEL INSTABILITY IN THE LOESS AREA OF THE MIDWESTERN UNITED STATES¹

CHANNEL INSTABILITY IN THE LOESS AREA OF THE MIDWESTERN UNITED STATES¹

Scour at selected bridge sites in Mississippi

Physiographic characteristics of bridge‐stream intersections

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Changes in channel characteristics, 1938-74, of the Homochitto River and tributaries, Mississippi

Cited by 24 publications

References 0 publications

CHANNEL INSTABILITY IN THE LOESS AREA OF THE MIDWESTERN UNITED STATES1

CHANNEL INSTABILITY IN THE LOESS AREA OF THE MIDWESTERN UNITED STATES1

Scour at selected bridge sites in Mississippi

Physiographic characteristics of bridge‐stream intersections

Contact Info

Product

Resources

About

CHANNEL INSTABILITY IN THE LOESS AREA OF THE MIDWESTERN UNITED STATES¹

CHANNEL INSTABILITY IN THE LOESS AREA OF THE MIDWESTERN UNITED STATES¹