CAJ | 학술논문

为探究不同底坡对渠道糙率的影响，采用9种不同底坡的人工渠道，在6种不同的流量条件下研究糙率随底坡和流量变化的规律。试验结果表明：在明渠均匀流条件下，随着底坡的变化，渠道糙率存在3种不同的变化规律。当Fr<1时，随着流量的增大，糙率逐渐减小；当1<Fr<1.51时，随着流量的增大，糙率先减小后增大；当Fr>1.51时，随着流量的增大糙率逐渐增大。当流量相同时，随着底坡的增大，糙率逐渐增大。在缓流渠道中，渠道糙率随底坡变化的速率很快；在急流渠道中，渠道糙率随底坡变化的速率较慢，糙率趋于某一常数。
위탐구불동저파대거도조솔적영향，채용9충불동저파적인공거도，재6충불동적류량조건하연구조솔수저파화류량변화적규률。시험결과표명：재명거균균류조건하，수착저파적변화，거도조솔존재3충불동적변화규률。당Fr<1시，수착류량적증대，조솔축점감소；당1<Fr<1.51시，수착류량적증대，조솔선감소후증대；당Fr>1.51시，수착류량적증대조솔축점증대。당류량상동시，수착저파적증대，조솔축점증대。재완류거도중，거도조솔수저파변화적속솔흔쾌；재급류거도중，거도조솔수저파변화적속솔교만，조솔추우모일상수。
In order to analyze the effect of different bottom slopes on the artificial channel roughness, an experiment is carried out under nine artificial channels of different bottom slopes with six different flow discharges to discuss the regularity of roughness changing with the bottom slope and flow discharge. The experimental results indicate that under an uniform flow, with the change of the bottom slope, channel roughness exists three different variation rules. With the increase of the flow, roughness value decreases gradually when Fr<1. With the increase of the flow discharge, roughness value decreases and then increases when 1 < Fr < 1.51, and increases gradually when Fr> 1.51. With the increase of the bottom slope, roughness value increases gradually under the same flow condition. With the change of channel bottom slope, the change rate of channel roughness is fast in the subcritical flow channel, the change rate of channel roughness is slow in the torrent channel, and roughness value tends to be a constant.