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035 a| (Sirsi) o173495571;

035 a| (OCoLC)173495571;

043 a| n-uss--;

049 a| ERE#;

074 a| 0620-A (online);

086 0 a| I 19.4/2:1301;

100 1 a| Blevins, Dale W.=| ^A573246;

245 14 a| The response of suspended sediment, turbidity, and velocity to historical alterations of the Missouri River /c| by Dale W. Blevins.;

260 a| Reston, Va. :b| U.S. Dept. of the Interior, U.S. Geological Survey,c| 2007.;

300 a| iv, 8 pages :b| digital, PDF file.;

336 a| text2| rdacontent;

337 a| computer2| rdamedia;

338 a| online resource2| rdacarrier;

490 1 a| Circular ;v| 1301;

500 a| "Prepared in cooperation with the U.S. Environmental Protection Agency.";

500 a| Title from Web page (viewed on Sept. 28, 2007).;

504 a| Includes bibliographical references (p. 8).;

520 a| "Median suspended-sediment concentrations in the lower Missouri River appear to have decreased by at least 70 to 80 percent from predevelopment conditions, although two semiquantitative sediment-settling observations made by William Clark and Edward Harris indicate even larger reductions in maximum concentrations. Regardless of the amount of reliability that might be ascribed to the Clark and Harris measurements, the decrease in suspended-sediment concentrations and increase in water clarity of the Missouri River is remarkable. Most of this decrease occurred after the closure of dams and massive bank stabilization activities that occured in the 1950s and 1960s. The ecological change that may have resulted from the decrease in suspended-sediment and turbidity has not been documented. However, numerous ecological changes can be postulated from fundamental principles of aquatic ecology (Horne and Goldman, 1994). For example, the greater range in velocities likely resulted in a greater range in turbidity and a greater variety of fish habitat. Also, increased water clarity may permit algal photosynthesis at low river stages providing a new energy source for the food chain and a niche for nonnative planktivorus fish. Increased water clarity should benefit sight-feeding fish, perhaps at the expense of native fish such as catfish, drum, and the endangered pallid sturgeon, that need little light to find food. Thus, the top end of the food chain also may be altered with a potential trophic cascade that could substantially alter the food chain and populations of many species. Conversely, drinking-water suppliers and other users who must remove river sediments benefit from the decrease in suspended material."--Conclusions and implications.;

538 a| System requirements: PDF reader.;

538 a| Mode of access: World Wide Web from the USGS web site. Address as of 7/17/08: http://pubs.usgs.gov/circ/2006/1301/pdf/circ%5F1301.pdf ; current access available via PURL.;

650 0 a| Sediment transportz| Missouri River.=| ^A20741;

650 0 a| River engineeringx| Environmental aspectsz| Missouri River Watershed.=| ^A200178;

710 2 a| Geological Survey (U.S.)=| ^A964818;

830 0 a| U.S. Geological Survey circularv| 1301.=| ^A367656;

856 40 u| https://purl.fdlp.gov/GPO/LPS97391;

994 a| C0b| ERE;

998 a| 1394925;

998 a| u1394925;

596 a| 1;

999 a| CLICK ON WEB ADDRESSw| ASISc| 1i| MQ2602133l| JNETm| JOYNERr| Ys| Yt| JNE1DOu| 8/27/2008x| EDOCUMENTz| JERESOURCEo| .STAFF. 0;

The response of suspended sediment, turbidity, and velocity to historical alterations of the Missouri River / by Dale W. Blevins.

Author/creator	Blevins, Dale W.
Other author	Geological Survey (U.S.)
Format	Electronic
Publication Info	Reston, Va. : U.S. Dept. of the Interior, U.S. Geological Survey, 2007.
Description	iv, 8 pages : digital, PDF file.
Supplemental Content	https://purl.fdlp.gov/GPO/LPS97391
Subjects	Sediment transport--Missouri River. River engineering--Environmental aspects. --Missouri River Watershed.

Series	Circular ; 1301 U.S. Geological Survey circular 1301. ^A367656
Abstract	"Median suspended-sediment concentrations in the lower Missouri River appear to have decreased by at least 70 to 80 percent from predevelopment conditions, although two semiquantitative sediment-settling observations made by William Clark and Edward Harris indicate even larger reductions in maximum concentrations. Regardless of the amount of reliability that might be ascribed to the Clark and Harris measurements, the decrease in suspended-sediment concentrations and increase in water clarity of the Missouri River is remarkable. Most of this decrease occurred after the closure of dams and massive bank stabilization activities that occured in the 1950s and 1960s. The ecological change that may have resulted from the decrease in suspended-sediment and turbidity has not been documented. However, numerous ecological changes can be postulated from fundamental principles of aquatic ecology (Horne and Goldman, 1994). For example, the greater range in velocities likely resulted in a greater range in turbidity and a greater variety of fish habitat. Also, increased water clarity may permit algal photosynthesis at low river stages providing a new energy source for the food chain and a niche for nonnative planktivorus fish. Increased water clarity should benefit sight-feeding fish, perhaps at the expense of native fish such as catfish, drum, and the endangered pallid sturgeon, that need little light to find food. Thus, the top end of the food chain also may be altered with a potential trophic cascade that could substantially alter the food chain and populations of many species. Conversely, drinking-water suppliers and other users who must remove river sediments benefit from the decrease in suspended material."--Conclusions and implications.
General note	"Prepared in cooperation with the U.S. Environmental Protection Agency."
General note	Title from Web page (viewed on Sept. 28, 2007).
Bibliography note	Includes bibliographical references (p. 8).
Technical details	System requirements: PDF reader.
Technical details	Mode of access: World Wide Web from the USGS web site. Address as of 7/17/08: http://pubs.usgs.gov/circ/2006/1301/pdf/circ%5F1301.pdf ; current access available via PURL.
Issued in other form	Blevins, Dale W. Response of suspended sediment, turbidity, and velocity to historical alterations of the Missouri River. Reston, Va. : U.S. Dept. of the Interior, U.S. Geological Survey, 2007
GPO item number	0620-A (online)
Govt. docs number	I 19.4/2:1301

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The response of suspended sediment, turbidity, and velocity to historical alterations of the Missouri River / by Dale W. Blevins.

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