侧槽底坡变化对侧堰淹没度影响研究  

Research on the Effect of the Changes of the Bottom Slope of the Side Channel on the Submergence Degree of the Side Weir

作　　者：周鑫宇 邱勇 吴锦钢 谢红英 周艺 ZHOU Xin-yu;QIU Yong;WU Jin-gang;XIE Hong-ying;ZHOU Yi(College of Water Resources and Hydraulic Engineering,Yunnan Agricultural University,Kunming 650201,China)

机构地区：[1]云南农业大学水利学院,昆明650201

出　　处：《中国农村水利水电》2022年第9期44-48,共5页China Rural Water and Hydropower

摘　　要：侧槽设计时,应保证侧堰为自由出流,亦即需要按照校核流量进行槽首断面水深计算。通过数值模拟,研究侧槽底坡变化对槽首淹没的影响。成果表明:(1)在不同底坡条件下,侧堰过流能力的增幅均出现先增大后减小的情况;(2)在所研究的纵坡变化范围内,均可通过增大侧堰长度(槽首、槽末高差不变),减小侧槽底坡的方式避免侧堰被淹没。限于地质条件,槽首底板高差难以降低时,可通过增加顺等高线布置的侧堰长度来保证其过流不出现淹没,适当提高侧槽溢洪道的超泄能力。The design of the side channel should ensure that the side weir is free outflow,which means that the water depth of the channel head section needs to be calculated according to the check flow.The effect of the change of bottom slope of the side channel on the submerge of the channel head is studied by numerical simulation.The results show that:(1) under different bottom conditions,the increase in the flow capacity of the side weir increased first and then decreased;(2) the submerge of the side weir can be avoided by increasing the length of the side weir(the difference in height between the head and the end of the channel remains unchanged)and decreasing the bottom slope of the side channel within the range of the studied longitudinal slope changes.When it is difficult to reduce the height difference of the bottom plate at the beginning of the weir due to geological conditions,the length of the side weir arranged along the contour can be increased to ensure that it will not be submerged when it overflows,and the super discharge capacity of the side channel spillway can be appropriately improved.

关 键 词：侧堰长度 淹没度 泄流能力 底坡变化 侧槽溢洪道 

分 类 号：TV135[水利工程—水力学及河流动力学]