| Abstract: | Bank erosion and changes in channel width, length, and pattern were determined for the Powder River between Moorhead and Broadus, Montana using maps of the bankfull channel made from aerial photographs taken during 1939, 1954, 1967, 1973, and 1978. Contemporaneous daily mean and peak discharge records from Moorhead provide the hydrologic data used to interpret the measurements. Magnitudes and frequency of flows were determined for each interval of time delimited by photographs. Bank erosion is related to the number of days that mean discharge was equal to or greater than bankfull (1.5-year flood). Mean channel width ranged between 264 ft (1973) and 415 ft (1967). The channel was wider after periods of higher annual peak flows. The channel lengthened between 1939 and 1978, although at least 12 meanders cut off between Moorhead and Broadus. Variable rates of lengthening in the reach reflect the degree of bedrock control in the valley and local variations in valley slope. Data from the Powder River verify the concept of thresholds of channel pattern stability that were demonstrated experimentally. (USGS) |
| Genre: | USGS Numbered Series |
| ProdID: | 28579 |
| Citation Author: | Martinson, H. A. |
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| Citation Language: | ENGLISH |
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| Citation Phsyical Description: | vi, 62 p. :ill., maps ;28 cm. |
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| Citation Publisher: | U.S. Geological Survey, |
| Citation Series: | Water-Resources Investigations Report |
| Citation Series Code: | WRI |
| Citation Series Number: | 83-4128 |
| Citation Search Results Text: | Channel changes of Powder River between Moorhead and Broadus, Montana, 1939-1978; 1984; WRI; 83-4128; Martinson, H. A. |
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| Citation Year: | 1984 |
| Type: | citation/reference |
| Text: | Channel changes of Powder River between Moorhead and Broadus, Montana, 1939-1978; 1984; WRI; 83-4128; Martinson, H. A. |
| URL (THUMBNAIL): | http://pubs.usgs.gov/wri/1983/4128/report-thumb.jpg |
| URL (DOCUMENT): | http://pubs.usgs.gov/wri/1983/4128/report.pdf |
| Date Other: | Sat, 1 Jan 1994 00:00 -0600 |
| Publisher: | U.S. Geological Survey, |
