CAJ | 학술논문

为了研究丁坝群对河流系统的作用，通过对不同间距下非淹没双体丁坝流场的比较分析，提出基于大尺度涡不相重叠、基于双丁坝断面流速分布相似和基于下游丁坝断面流速分布恢复的3种非淹没双体丁坝作用尺度划分准则，并对3种准则的优缺点及适用范围进行分析。在此基础上，分别运用3种划分准则对同一工况下非淹没双体丁坝的间距阈值进行计算，计算结果与恢复段长度的经验值进行对比，结果表明基于双丁坝断面流速分布相似和基于下游丁坝断面流速分布恢复准则的计算结果相近且均在经验范围之内，基于大尺度涡不相重叠准则的计算结果偏小，但计算简单，可结合丁坝回流区长度计算公式用于对丁坝群作用尺度进行初步估算。
위료연구정패군대하류계통적작용，통과대불동간거하비엄몰쌍체정패류장적비교분석，제출기우대척도와불상중첩、기우쌍정패단면류속분포상사화기우하유정패단면류속분포회복적3충비엄몰쌍체정패작용척도화분준칙，병대3충준칙적우결점급괄용범위진행분석。재차기출상，분별운용3충화분준칙대동일공황하비엄몰쌍체정패적간거역치진행계산，계산결과여회복단장도적경험치진행대비，결과표명기우쌍정패단면류속분포상사화기우하유정패단면류속분포회복준칙적계산결과상근차균재경험범위지내，기우대척도와불상중첩준칙적계산결과편소，단계산간단，가결합정패회류구장도계산공식용우대정패군작용척도진행초보고산。
In order to investigate the impact of spur dike group acting on river system ,three classification criteria of impact scale of non‐submerged double spur dikes w ere presented according to the comparison of non‐submerged double spur dikes’ flow field under different dike spacing ,which were respectively based on large‐scale vortexes nonoverlapping , the cross‐section velocity of double spur dikes similarly distributing and the cross‐section velocity of downstream dike recovering .Meanwhile ,their advantages , disadvantages and application scopes were analyzed .On this basis ,three criteria were applied to calculate the threshold of dike spacing under a same condition .The comparison between the calculation results and empirical value of the length of recovery segment shows that the calculation values based on the cross‐section velocity of double spur dikes similarly distributing and the cross‐section velocity of dow nstream dike recovering are similar and both in the empirical range ,while the value based on large‐scale vortexes nonoverlapping is smaller than empirical value but simple to calculate ,and it can be used to preliminarily estimate the impact scale of spur dikes through combining with the length formula of spur dike back‐flow zone .