Abstract: Lanjiangji is a typical hazardous reef shoal in the lower Yangtze River with both flow pattern and sediment problems.Based on analysis of alluvial process and model tests,the feature and changing law of the navigation-obstructing flow of the shoal reach is studied.Then,the layout of reef blasting works is researched in model tests,and the improvement of flow pattern and the stability of navigable waterway in the shoal reach are analyzed and estimated.The results show that after performance of reef blasting ...