Glacial Isostatic Adjustment Modulates Lateral Migration Rate and Morphology of the Red River (North Dakota, USA and Manitoba, Canada)

Abstract The lateral migration of a river meander is driven by erosion on the outer bank and deposition inner bank, both which are affected shear stress (and therefore channel slope) through complex morphodynamic feedbacks. To test sensitivity to slope, we quantify slope change induced glacial isostatic adjustment along Red River (North Dakota, USA Manitoba, Canada) two its tributaries over past 8.5 ka. We demonstrate statistically significant, positive relationship between normalized cutoff count, interpret as proxy for rate, change. this signature modulating magnitude riverbanks, suggesting that changes occur thousands years recorded in floodplain morphology.