三峡工程临时引航道泥沙淤积数值模拟

本文针对三峡工程临时引航道泥沙淤积问题，建立了异重流数学模型，对临时引航道的泥沙淤积进行了数值模拟，计算结果与观测资料符合良好。模型计算还区分了引航道口门段平面环流带来的淤积量和异重流淤积量，说明引航道的泥沙淤积主要发生在汛期水流含沙量较高时期，异重流淤积超过80%。计算还说明，引航道的泥沙淤积随水深和含沙量而增大。

Numerical simulation of sedimentation deposition in access channel of temporal shiplock in Three Gorges Project

The 2-D density flow model is established for numerically study the sedimentation deposition occurred in the access channel of temporal shiplock in the Three Gorges Project. The calculation result is in good agreement with the prototype observation data. The numerical simulation shows that about 20% of the deposition is caused by the horizontal circulation existing at the entrance of the channel and about 80% of the deposition is due to density current. It demonstrates that the deposition is mainly taken place at the flood season, during which the concentration of sediment is relatively high. It also reveals that the deposition is almost in linear correlation with the water depth and sediment concentration.