大淹没度低堰泄流能力研究

摘要

结合某工程实例,对大淹没度低堰选型以及大淹没度对低偃泄流能力的影响进行了研究.研究成果表明:在大淹没度下运行的低堰,堰的厚度与堰上水头之比δ/H≤0.67,且下游堰坡为陡坡的折线型实用堰比相同堰高的WES堰泄流能力大;在大淹没水深下运行的低堰,降低堰顶高程,减小堰高可增大泄流能力,但随着淹没水深的增加,低堰堰高以及堰面形式的变化对泄流能力的影响减小.%With a hydropower project as an engineering example,we researched the effect of weir type and big submergence depth on the discharge capacity of low weir.Results showed that:for low weir with big submergence flow,the ratio of weir thickness to waterhead δ/H≤0.67,and the discharge capacity of broken-line practical weir with steep slope in the downstream is larger than that of WES weir; for low weir with big submergence depth,the discharge capacity can be increased by declining the weir height,but with the increase of submergence depth,the influence of weir height and weir type on the discharge capacity is weakened.