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Jason S. Alexander

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We used a before-and-after study design to examine effects of changes in cattle grazing practices on channel stability in Muddy Creek, an arroyo in the Colorado River headwaters. The changes in grazing practices were abrupt and focused on keeping cattle out of the riparian zone and increasing herd movement. We digitized 620 meander loop cutoff geometries within the alluvial valley bottom of Muddy Creek. Poisson regression modeling of meander loop cutoff rate indicated that the change in grazing practices caused a decline in meander loop cutoff rate that was on the scale of an order of magnitude and independent of other hydroclimatic and human-caused factors. The polyline data released here was used in our analysis...
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Sandbars are ubiquitous in wide, braided, sand-bed rivers throughout the world. In the Great Plains of the United States, recovery and expansion of emergent sandbar habitat (ESH) has been a priority in lowland rivers where the natural extent of sandbars has been degraded. Despite the importance of ESH to river ecology and management, quantitative observations of the deposition and erosion behaviors of populations of sandbars across long segments of braided rivers are rare. This data release provides a series of those observations in support of a case-study of emergent sandbar deposition and erosion behaviors in the Platte River in eastern Nebraska, a wide, sandy, braided river at the eastern margin of the Great...
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