Fundamental Studies for River-Training Works

The main purpose of river-training works is flood control. Recently, the Ministry of Land, Infrastructure, Transport and Tourism (MLIT), Japan, has decided to incorporate environmental conservation to river training policies, which involves water quality, landscape, and diversity of wildlife habitats. To take those aspects into account, geological deformations by fluvial processes in river channels need to be simulated appropriately. However, it is still difficult to conduct river training works based on reliable predictions. This paper will introduce one of the examples of river-training works and associated fluvial processes, which were unpredictable and brought about unwelcome consequences. Also, the paper described an aDcp-based field survey and a resultant flow field. Finally, the authors will discuss the limitation of aDcp-based measurements and the conventional data processing method, and propose an alternative method to elevate simulation accuracy.