농업용수로의 표면유속 환산계수 산정

Abstract

The continuous flow velocity monitoring has become a difficult and expensive task in hydrological survey
 due to unpredictable rainfall patterns. Therefore, the velocity measurements using a non-contact type
 flowmeter is more effective and easy to use. The generally used average velocity conversion factor 0.85
 does not take into account the regional characteristics such as curves of a river, bed materials which
 consequentially affects the vertical flow characteristics. Therefore, considering the those characteristics of
 irrigation channels of two small reservoirs (Ssangam and Hangye reservoir), results showed that the gentle
 bed slope of irrigation channel of the Ssangam reservoir, has a velocity conversion factor of 1.06 and the
 depth-averaged velocity of V0.6, was measured to be higher compared to the surface velocity. On the other
 hand, velocity conversion factor of 0.83 was computed in case of Hangye reservoir with a relatively sharp
 bed slope, which is similar to the generally used velocity conversion factor of 0.85. This shows that the
 bed slope is the dominant factor in affecting the depth-wise velocity characteristics of a waterway.