Feedback Mechanism in Bifurcating River Systems: the Effect on Water-Level Sensitivity

摘要: Accurate and reliable estimates of water levels are essential to assess flood risk in river systems. In current practice, uncertainties involved the sensitivity these studied single-branch rivers, while many rivers deltas consist multiple distributaries. a bifurcating river, feedback mechanism exists between downstream discharge distribution at bifurcation. This paper aims quantify main channel roughness system. Water modelled for various scenarios under wide range conditions using one-dimensional hydraulic model. The results show that reduces local changes comparison river. However, smaller branches system, water-level variations induced by can exceed Therefore, throughout entire system dominated largest branch. As is important, should be considered as one interconnected maintenance flood-risk analyses, future planning engineering works.