저수시 하상상황에 따른 조도계수의 적용에 관한 연구

A Study on the Application of Roughness Coefficient to Low Water by Channel Factor

&nbsp;&nbsp;As the roughness coefficient by existing Manning table is used by technician&quot;s experience and judgement, it isn&quot;t always correct.<BR>&nbsp;&nbsp;This study as a try to make quantitative roughness coefficient is to suggest a new application mode computerizing roughness coefficient by surveying the velocity and hydraulic condition of small rivers.<BR>&nbsp;&nbsp;The bound of roughness coefficient was 0.027～0.180 and its values distribute uniformly. This means that the roughness coefficient adapt value by Manning table cannot fill up the transformed value when the small rivers are low.<BR>&nbsp;&nbsp;The roughness coefficient computation mode in this study with hydraulic radius(R), channel slope(I), average grain diameter(D) as subject factors presents as follows.<BR>&nbsp;&nbsp;n´ = 5.97 R&lt;SUP&gt;0.671&lt;/SUP&gt; I&lt;SUP&gt;0.452&lt;/SUP&gt; D&lt;SUP&gt;0.059&lt;/SUP&gt;