吉野川河道内に残留した水防竹林の管理計画に関する数値解析的検討

摘要

This study is concerned with a management plan of riverine bamboo groves which used to play an important role of flood protection but have been neglected in a river course after levee construction. The study site is a river channel between Tachino and Kamo on the right and left sides, respectively, and located in an upstream reach of the Yoshino River in Shikoku, Japan. A numerical model of two-dimensional shallow water flow was composed by taking account of form drag of bamboo bodies and influence of secondary flow on bed shear stress. This model was validated based on an observation results of surface velocity of an actual flood flow and was utilized to clarify the variation of river flow due to reduction of area and population density of bamboo forests. As a result, useful information was obtained for drawing up a reasonable bamboo grove management plan.