悬移质积时式取样方法再探

Further Study of Suspended Load Time-Integrating Sampling Method

以缆道为测验载体的水文站进行悬移质输沙率测验时,流速仪测流与调压积时式采样器取样分步进行,受流速脉动影响,悬移质取样容积不准确而影响测验成果精度。本文通过对控制悬移质取样的因素进行分析研究,提出了采用流速仪信号作为控制悬移质取样信息的取样方法,既解决了实现流速仪测流与调压积时式采样器取样同步进行的问题,又消除了流速脉动对积时式取样器取样容积精度的影响,完善了悬移质输沙率测验方案。

While suspended load sediment test is being made in hydrometric station in which cableway is used as test carrier,hydrometric propeller flow gaging and regulating time-integrating sampler are being sampled step by step.Influenced by velocity pulsation effects,suspended load sampling volume will be inaccurate.Thus test precision will be affected.The factor of suspended load sampling control is analysed,and a new sampling method of using velocity signal as control suspended load sampling information is put forwards.In this way,not only can the sampling synchronisation of hydrometric propeller flow gaging and regulating time-integrating sampler be realized but also the influence of velocity pulsation on time-integrating sampler sampling accuracy be removed and suspended load sediment rate test scheme be completed.