Stabilization mechanism of braided streams due to control of water and sediment supply

摘要

The mechanism of stabilization for braided streams through control of water and sediment supply is verified based on field observations and numerical computations. The results show that braided streams are dynamic and do not approach equilibrium bed geometry when water and sediment supply are not reduced by dam operations. Such rivers are expected to promote natural riverine ecosystems because they provide a diversified physical environment for the plants and animals that inhabit rivers. In contrast, reduction of water and sediment supply promotes river channel stability and simplifies the physical environment of the stream by decreasing water levels and promoting vegetation growth.