【摘要】 矩型薄壁堰是一种重要的量水工具 ,使用中发现 ,当小流量通过薄壁堰时 ,易发生水流贴壁现象。通过反复的现场放水试验研究 ,发现矩型薄壁堰发生贴壁堰流时的水位流量关系与正常堰流时的水位流量关系不一致 ,相同水位时贴壁流的过流能力大。本文提出了防止贴壁流现象发生的方法和措施。以期引起使用者的注意 ,在应用矩型薄壁堰时应注意避免水流贴壁现象的发生 ,以免影响测流的准确性。更多还原

【Abstract】 Rectangle thin-wall weir is a main implement to measure water flow. A phenomenon of wall pressing flow is found frequently when the small water runoff passes the thin-wall weir. A lot of on-spot experiments discovered that the water level and flow rate of wall-pressing weir flow are not accord with that of the normal weir flow. The pressing wall water flow rate is bigger than the later under same water level. The present paper put forward the control measures preventing the water from press the wall; For the more accruate flow rate measurement, the phenomenon of wall pressing flow should be avoid when using the rectangle thin-wall weir to measure the water flow rate.更多还原