Andrew Moodie, Paola Passalacqua 

Deltas exhibit spatially and temporally variable subsidence, including vertical displacement due to movement along fault planes. Faulting-induced subsidence perturbs delta-surface gradients, potentially causing distributary networks to shift sediment dispersal within the landscape. Sediment dispersal restricted to part of the landscape could hinder billion-dollar investments aiming to restore delta land, making faulting-induced subsidence a significant, yet unconstrained hazard to these projects. In this study, we modeled a range of displacement events in disparate deltaic environments, and observe that a channelized connection with the displaced area determines whether a distributary network reorganizes. When this connection exists, the magnitude of distributary network reorganization is predicted by a ratio relating dimensions of faulting-induced subsidence and channel geometry. We use this ratio to extend results to real-world deltas and assess hazards to deltaic-land building projects.