岷江下段航道典型滩险整治技术

Regulation technique on Minjiang downstream waterway typical rapids

岷江干流龙溪口枢纽以下河段为天然航道,具有典型的山区河流特征,碍航特性极其复杂,加之河道历年来受挖沙采石影响,航道条件恶化严重。采用长河段平面二维水流数学模型对拟建岷江龙溪口枢纽至屏山镇岷江大桥段11处滩险的整治方案进行对比分析及优化研究。在碍航特性及滩险成因分析的基础上,选取该段航道内干龙子滩、白甲滩以及新开河滩段3个具有典型代表性的滩段,从通航水流改善程度、挖槽稳定性以及船舶自航上滩等方面进行多组方案的比选,总结岷江下段典型代表性滩险的整治技术。

The reach below Longxikou junction in the trunk stream of Minjiang River is a natural waterway,which has typical mountain river characteristics and is extremely complex in navigation obstruction.In addition,the waterway has been seriously deteriorated due to the influence of sand excavation and stone quarrying over the years.The two-dimensional flow mathematical model of long river is used to analyze and optimize the regulation scheme of 11 rapids in the proposed Longxikou junction of Minjiang River to Minjiang River Bridge section at Pingshan Town.Based on the analysis of the characteristics of navigation obstruction and the causes of rapids,three typical rapids,Ganlongzi rapid,Baijia rapid and Xinkai River rapid,are selected.The comparison and selection of several schemes are carried out from the aspects of the improvement of navigation flow,the stability of trenching and the self navigation of ships on the beach,and the regulation technology of typical representative rapids in the lower section of Minjiang River is summarized.