| Abstract: | Channel modifications from 1968 to 1969 on the South Fork Forked Deer River in western Tennessee have caused upstream degradation, downstream aggradation, and bank failures along the altered channels, adjacent reaches, and tributaries. The result of these adjustments is a general decrease in gradient as the channel attempts to absorb the imposed increase in energy conditions created by channelization. Headward degradation at a rate of approximately 2.57 km/yr on the South Fork Forked Deer River caused from 1.52 m to about 3.14 m of incision over a 13.5 km reach from 1969 to 1981. As a consequence of substantially increased sediment supply, approximately 2.13 m of aggradation was induced downstream of this reach during the same period. This accumulation represents a 60% recovery of bed level at the downstream site since the completion of channel work in 1969. Gradient adjustment with time is described by exponential decay functions. The length of time required for adjustment to some new quasi-equilibrium condition is computed by these decay functions and is about 20 years from the completion of channel work. Adjusted slopes are less than predisturbed values, probably because straightened channels dissipate less energy by friction, allowing more energy for sediment transport. An equivalent sediment load, therefore, can be transported at a considerably gentler slope. The predisturbed slope exceeds the adjusted slope by an order of magnitude on the downstream reach of the South Fork Forked Deer River. ?? 1987 Springer-Verlag New York Inc. |
| Genre: | Article |
| ProdID: | 70015310 |
| Citation Author: | Simon, A.; Robbins, C. H. |
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| Citation End Page: | 118 |
| Citation Issue: | 2 |
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| Citation Language: | English |
| Citation Larger Work Title: | Environmental Geology and Water Sciences |
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| Citation Number Of Pages: | 10 |
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| Citation Search Results Text: | Man-induced gradient adjustment of the South Fork Forked Deer River, west Tennessee; 1987; Article; Journal; Environmental Geology and Water Sciences; Simon, A.; Robbins, C. H. |
| Citation Start Page: | 109 |
| Citation Volume: | 9 |
| Citation Year: | 1987 |
| Type: | citation/reference |
| Text: | Man-induced gradient adjustment of the South Fork Forked Deer River, west Tennessee; 1987; Article; Journal; Environmental Geology and Water Sciences; Simon, A.; Robbins, C. H. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1007/BF02449942 |
| Date Other: | Thu, 1 Jan 1987 00:00 -0600 |
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