Flow structures and preservation mechanism in concavity zones for improving ecological environment in rivers

河流生态环境改善的空间形态多样。通过野外观测、室内试验和数值模拟，研究了边界条件对水流运动和泥沙输移的影响。对于滨江，从河涌形态和水流阶段的形成过程出发，阐明了河涌的水流特征和泥沙淤积机理。指出了利用透水丁坝和漂石创造水池和河道多样性的要点。

Various configurations were considered as concavity spaces for improving ecological environment in rivers. The effects of their boundary conditions on flow behaviors and sediment transport were investigated by field observations, laboratory experiments and numerical simulations. As to the riverside embayments, flow characteristics and sand deposition mechanism were clarified with respect to the configuration process of embayments and flow stage. The important points were indicated for creating pools and river course diversity by using permeable groynes and boulders.