| 基于EGM模型的多波束无验潮测深技术应用 |
| Application of multibeam non-tidal sounding technology based on EGM |
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| DOI： |
| 中文关键词: 水深测量 无验潮 多波束 EGM2008模型 |
| 英文关键词:bathymetry non-tidal sounding multibeam EGM2008 |
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| 中文摘要: |
| 多波束水深测量中受潮汐因素的影响，测量垂直基准是变化的，具有瞬时性。传统多波束测量，需在测区内设立一个或多个验潮站进行同步水位观测，最终将水深归算到深度基准面上。针对多波束水深测量中垂直基准转换的复杂性问题，本文基于地球重力场模型，结合测区内实测的GNSS/水准数据，通过插值算法建立了测区范围内似大地水准面精化模型，构建了多波束无验潮水深测量的垂直基准转换模型。通过实例表明，该方法可有效地消除了潮汐、动态吃水及涌浪等因素影响，直接获取深度基准面的水深值，提高工作效率，满足近岸多波束水深测量的工作需求。 |
| 英文摘要: |
| In multibeam bathymetry, the vertical datum is variable and instantaneous, influenced by tides. In traditional multibeam bathymetry, we should set up one or more tide stations in the survey area, to synchronously observe the water level, and reduce the water depth to the chart datum. Due to the complexity of vertical datum conversion in multibeam bathymetry, we propose a vertical datum conversion model for multibeam non-tidal sounding, by building the quasi-geoid model with interpolation method in the survey area, with the EGM and the GNSS/leveling data. This method can directly obtain the bathymetric value of depth datum and meet the demand of offshore multibeam bathymetry. In terms of error, this method can effectively eliminate the effects of tides, dynamic draft, surging waves or other factors, which improve work efficiency. |
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