The Influence to the Riverbed Stability of the Different Intervals of the Ground Sills

• Main Author: 郭昌樺
• Other Authors: 段錦浩
• Format: Others
• Language: zh-TW
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/06152188741340497277

碩士 === 國立中興大學 === 水土保持學系 === 90 === The major purpose of this study is to discuss the influence that ground sills are established in riverbed. In addition, it conducts clear-water discharge flume experiments that can know the sand volumetric movement changes in different protection ranges of ground sills and the efficiency to stabilize the channel-bed. The result of the study infers that channel-bed scour has gone down with the decrease of the interval ground sills, this shows ground sills has the ability to stabilize the channel-bed. Besides, the influence of ground sills is lead channel-bed scour to pass through protection ranges of ground sills and make carry soils amount of water constant, not control the scour by gnawing water power. Another, we know the data intense increase and are close to extreme value when interval of ground sills are 2~7 times channel wide. Besides, the effect of full river length protection to steady channel and reduce scour rate is better than half section protection. By the relationship between average scour rate of riverbed and stream power,we know that have direct proportion between them. According to this, under the protection range of ground sills are based on known terms like components of the interval ground sills, we establish the relationship equation among average scour rate, stream power, critical silt start power, interval of ground sills and slope gradient: the related coefficient r2=0.89.We can figure out average scour rate of riverbed by interval ground sills have been known, and hope to provide for the field operation further.