不同开挖条件对山区挖入式码头通航水流条件影响分析

Influence of different excavation conditions on navigable flow conditions for excavated wharf in mountainous area

开挖进出港航道与港池将会改变河道原有的河床地形高程,进而改变其原有的水动力条件及其泥沙冲淤状况,对通航条件造成影响。以犍为孝姑码头为依托,采用Mike21建立二维水沙数值模型,分析开挖进出港航道和港池工程前后,以及改变进港航道的深度、宽度、角度等之后的水流运动形态和泥沙淤积的情况。结果表明:开挖进出港航道和港池后对原有的主航道整体水流和泥沙条件影响较小,对船舶进出港的通航条件影响较小;不同的开挖条件对进出港航道和港池的水沙条件影响不同,不同开挖角度对孝姑码头的水沙影响较大,30°布置形式更能满足孝姑码头的通航水流条件。

Excavating channels for entering and leaving harbor and harbor basin can change the original riverbed topography and elevation,thereby altering its hydrodynamic conditions and sediment erosion and deposition,and affecting its navigation conditions.In response to this issue,we take Xiaogu Wharf in Qianwei as a basis,use Mike21 to build a two-dimensional numerical model of water and sediment,and analyze the water flow pattern and sediment accumulation before and after excavation of channels for entering and leaving harbor and harbor basin engineering,as well as after changing the depth,width,angle,etc.of the channel for entering harbor.The results show that excavation of channels for entering and leaving harbor and harbor basin has a relatively small impact on the overall water flow and sediment conditions of the original main channel,and a relatively small impact on the navigation conditions for ships entering and leaving harbor.Different excavation conditions have different impacts on the water and sediment conditions of channels for entering and leaving harbor and harbor basin.Different excavation angle conditions have a greater impact on the water and sediment conditions of Xiaogu Wharf,and the 30°layout can better meet the navigation flow conditions of Xiaogu Wharf.