| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To restore natural environments for the growth and the like of swimming fish by developing such a fish pass as to be properly constructible in a low-cost, small-space, short-time-work and maintenance-saving manner, when the run-up of the fish living in a mountain stream is hindered because a step is made in a water current in small-and-medium-sized rivers. <P>SOLUTION: A slope current in a mountain stream, a waterfall, and a deep pool are compactly reproduced. Contrivances are applied so that a strong eddy current pool for helping jumping of fish living in a mountain stream and discharge of small-particle refuse, a running waterfall and an inclined watercourse in a directly upper section and an upper strong eddy current pool in a front section can be continuously disposed by vertically stacking blocks in multi-tiers in spite of the small-size blocks. A basic block body is constituted by providing an opening so that a daylighting portion can necessarily exist in a run-up direction. <P>COPYRIGHT: (C)2012,JPO&INPIT</p> |
