本文概述了航测在铁路桥涵水文勘测中的应用,并着重阐述了航测水文技术在桥渡水文调查与测绘中的应用。文中结合生产中的典型实例,说明在桥渡水文调查中,如桥渡位置的选择,水文断面的布置,河道变迁及古河道,河床冲刷及淤积,洪水泛滥线,流域特征,特殊水文情况(如泥石流、洪积扇、漫流、潜流、沼泽等),以及既有水工建筑物的调查研 This paper summarizes the application of aerial survey in hydrological survey of railway bridges and culverts, and emphatically expounds the application of aerial hydrological techniques in the investigation and survey of bridge crossing hydrology. Based on the typical examples in the production, this paper describes the investigation of the cross-river hydrological survey, such as the choice of location of the bridge crossing, the arrangement of the hydrological section, the change of the river course, the ancient river course, riverbed erosion and siltation, flood flooding line, Such as debris flow, alluvial fans, diffuse, undercurrents, swamps, etc.), as well as the investigation of existing hydraulic structures