River Bed Degradation due to Abrupt Outfall Lowering
Publication: Journal of Hydraulic Engineering
Volume 118, Issue 6
Abstract
Lower reaches of tributaries to the Missouri River were straightened in the late 19th and early 20th century. Channel degradation has progressed upstream as a result. Channel deepening and widening have caused problems at stream crossings and have resulted in gully encroachment into cultivated fields. A diffusion model and an hyperbolic model, each describing channel degradation, are solved using a Laplace transform approach. A closed‐form solution is obtained for the diffusion model, but numerical methods are necessary for evaluation of the inverse transform of the hyperbolic model. A closed‐form asymptotic solution is found for the hyperbolic case. This asymptotic solution is shown to contain the solution to the diffusion model as a special case. The asymptotic solution is compared with observed degradation of West Tarkio Creek, a small river in northwestern Missouri and southwestern Iowa, with good results.
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Published In
Journal of Hydraulic Engineering
Volume 118 • Issue 6 • June 1992
Pages: 918 - 933
Copyright
Copyright © 1992 ASCE.
History
Published online: Jun 1, 1992
Published in print: Jun 1992
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