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The Luke and Higley basins of Phoenix, AZ The Luke and Higley basins of Phoenix, AZ (USA) were once endorheic basins that gradually filled up with sediments (i.e., they aggraded). At the start of the Pleistocene ( ~2.5 Ma), the Salt and Gila rivers integrated into these basins, changing them to exoreic rivers. Aggradation remained after integration and persisted to the present day, producing a continuous local base-level rise. In the presence of aggradation, the expectation is to observe channel infilling on pediments and alluvial fans. However, we observed the exact opposite condition in some cases: increased incision. We hypothesize that a massive lateral shift in piedmont base-level produced by Salt and Gila rivers integration explains the increase in the local incision, despite the basin aggradation. We tested our hypothesis through a 1D diffusion model representing an idealized piedmont profile under different toe displacement conditions. The diffusion simulations support the hypothesis that base-level rise and lateral shifting can generate piedmont incisions. Indeed, incisions would only appear if u*tan( β)/v > 1, where u, v, and β are the rate of lateral shift, rate of base-level rise, and initial elevation angle of the piedmont, respectively. Our findings suggest that some past sedimentological records of pediments and alluvial-fan systems could have been misinterpreted (i.e., associated with base-level fall). However, additional research is necessary to confirm our initial findings.is necessary to confirm our initial findings.  +
A new explanation for bedrock-pediment incisions under toe-moving conditions described as a diffusive system  +
Christian  +, Mark  +  and Ron  +
Gonzalez  +, Schmeeckle  +  and Dorn  +
mmkelle4@asu.edu  +
Arizona State University  +
4129566373  +
3) The Art of Modeling  +
3) Introduction to Landlab  +
1) Component Creation with Landlab  +
United States  +
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18:21:12, 23 March 2022  +
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18:21:12, 23 March 2022  +
{{{OtherCountry}}}  +
Arizona  +
Terrestrial Working Group  +