Results elucidate channel width, slope, discharge, and sediment dynamics consistent with a gradual transition from detachment- to transport-limited incision in fluvial adjustment to local base-level lowering. A meander is another name for a bend in a river. More than half of the river provides views of magnificently adjoined snowcapped mountains. Today, diffusion dominates incision of a 500-m-long knickzone upstream of the gorge, where sediment transport likely limits ongoing adjustments to the anthropogenic cutoff. 83 mi / 133.5 km inside Gates of the Arctic National Park & Preserve Scenic Quality The Alatna River corridor has stunning scenery that includes views of the Arrigetch Peaks, a granitic disturbance that is a natural national landmark. Initial fast knickpoint propagation (23 m/yr 1900β1903 CE) slowed (4 m/yr 1903β1981 CE) to diffusion (1981β2019 CE) as knickpoint slope decreased, yielding an ~350-m-long, 6-m-deep gorge within the preβ1900 CE channel. Tectonic quiescence, consistent rock erosivity, and low millennial erosion rates provide ideal boundary conditions for this 10 2 yr gorge-formation experiment. Download The Meander of the Walker Fork River - The landscape around Taylor Highway, Alaska, USA Stock Photo and explore similar images at Adobe Stock. Miners cut off the meander in 1900 CE, abruptly lowering local base level by 6 m and forcing narrowing and steepening of the channel across a knickpoint that rapidly incised upstream. I quantify 10 2 yr rates and processes of gorge incision using historical records, field observations, and topographic and image analysis of a human-caused bedrock meander cutoff along the North Fork Fortymile River in Alaska (USA). Figure 18. The erosion problems are taking place in four locations. by Jenessa Duncombe 13 January 2022 In 1900, gold. The river is eroding at cut bank meanders as much as 6 feet per year but that would be a maximum amount. One hundred years later, the new channel is teaching scientists how rivers shape Earth. Bedrock river-gorge incision represents a fundamental landscape-shaping process, but a dearth of observational data at >10 yr timescales impedes understanding of gorge formation. In fact, portions of a stream may be straight, some meandering and others. Miners in Alaska rerouted a river to search for gold.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |