抄録
After the high-growth era started from the 1960`s, most of the small and medium-sized urban rivers in Japan were reconstructed with concrete walls on all sides. Despite the significant improvement for flood protection purposes, such river reconstruction resulted in incuriosity or indifference among people because the flow feature lost its variety due to simple and monochrome river works. In light of the present poor urban river status, this study aims at improving the stream landscape by installing small-sized structures into originally monotonous flow. We propose two types of stream landscape structures, i.e. a double arch type structure and submerged island type structures. The first type generates an oscillating hydraulic jump artificially between two low weirs. The second type produces large scale Karman vortices in shallow water depth conditions. The hydraulic features of each type are examined in detail experimentally by using a flume specifically designed for the present purposes
