北江干流某大型水利枢纽工程对河势影响的模型试验研究

An experimental investigation on the impact of a large-scale hydro-project to the river regime at the Beijiang River

清远水利枢纽工程是继飞来峡水利枢纽后在北江干流上拟建的又一大型水利枢纽工程,由于该工程所处的特殊地理位置,其工程建设对全国七大必保堤围之一的北江大堤安全影响成为焦点问题。通过定床物理模型试验,研究比较了有岛和无岛两种枢纽布置方案,分析了枢纽建成后带来的水位壅高、流场变化、分流比变化及下游流场改变给北江大堤的安全带来的影响。依据试验研究成果为设计部门推荐了较优的无岛枢纽布置方案,并就枢纽运行后对北江大堤可能造成的影响提出了相应的保护补救措施。

The Qingyuan Hydro-Project is another large-scale water control project proposed after the Feilaixia Project at the Beijiang River. Because the special geographical location of the Qingyuan Project, its effect on the safety of the Beijiang levee, one of the seventh most important levees in China, becomes a key issue. In this research, fixed-bed experiments have been carried out using two scenarios--with-island and without-island. The backwater effect, velocity distribution variation, flow ratio re-distribution are observed and investigated during the experiments. The results indicate that without-island scenario is a better performer and therefore, recommended. Other protective measures are also recommended for protecting the Beijiang levee.