2013 Volume 19 Pages 195-198
The authors of this paper have established an automatic water-discharge measurement system with a fixed type Non-Contact Current Meter (NCCM), especially Radio wave type. In the system, following three points must be discussed; 1) measurement of a representative flow velocity with the NCCM, 2) estimation of a velocity index, as well as 3) measurement of a river-bed fluctuation. In this paper, the authors mainly focused on the second aspect, which is, especially, the index with different riverbed condition. Based on our observation, the velocity index fluctuated widely when sand wave exists, though it does not so when the bed fixed. The authors measured the index beyond 1.0 when velocity measured at crests of sand wave, even though the index is widely accepted as 0.85.
