Author(s): Yoshiki Motonaga; Atsuhiro Yorozuya; Kazuhiko Fukami; Masashige Yamasaka
Linked Author(s): Masashige Yamasaka
Keywords: Utomatic Water-discharge measurement system; ADCP; Velocity Index; Vertical velocity distribution of flow; Sand wave; Riverbed condition
Abstract: 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 in rivers with riverbed change. In the case of river with sand waves, the width of velocity index was wider than that in the case of rivers with single riverbed fluctuation, and sometimes, the index exceeded 1. 0 in the river with sand waves. However, in the case of rivers without riverbed fluctuation, the index did not change clearly.
Year: 2013