Abstract: To address the limitations of traditional observation methods in terms of observation efficiency and data accuracy for hydrological sediment monitoring in mountainous reservoir environments,this study proposes an integrated land-water measurement technology based on manned vessel platforms.By integrating laser scanners,inertial navigation systems (INS),GNSS,single/multi-beam echosounders,and water level gauges on dedicated hydrological survey vessels,we establish a comprehensive reservoir-borne measurement platform.This system enables simultaneous monitoring of multiple hydrological elements including littoral zone topography,underwater terrain,water level,and surface flow velocity/direction.Application in the Baihetan reservoir area and accuracy analysis demonstrate that the shipborne integrated measurement system improves field observation efficiency by 4.5 times,with relative errors of topographic measurement accuracy better than 2%and water level accuracy errors below 1%.The proposed vessel-based integrated hydrological measurement technology proves feasible for rapidly acquiring comprehensive hydrological data including complex land-water terrain in mountainous reservoir regions.

Key words: hydrological parameters, shipborne integration, data accuracy analysis, the Baihetan reservoir area