引黄渠首工程水沙测验中漏测底沙的定量分析

Quantitative Analysis of Bottom Sand Flow Failed to Measure in the Test of Water and Sand at Headwork of Yellow River Diversion

针对山东引黄渠首口门泥沙测验中,由于受取样仪器的制约,仅能取到距河底0.1～0.3m以上的悬移质泥沙,给引黄渠首真实引沙量的评价带来一定偏差的问题,采用了引黄渠首闸前与闸后断面对比的实测方法进行研究。结论认为:漏测泥沙数量占闸前断面总沙量的7.5％～11.0％,漏测粒径大于0.025mm的有害泥沙为5％～8％。

Aimed at the problem of sand Quantity failed to measure due to restrict of sampling instrument, which can take only the suspended sand at the depth of 0.1 -0.3 m above river bed, in the test of sand at headwork of Yellow River diversion, which will lead to error in the appraisal of the real sand quantity diverted. Research on the real measuring comparison between the cross - sections of before and after the water diversion gate from Yellow River is conducted. The conclusions are drawn that the sand quantity failed to measure is about 7.5%-11.0% of the total sand quantity diverted at the cross - section before the gate; the harmful sand with granule greater than 0.025 mm is 5 % - 8 % of the sand and which is failed to measure.