常用单波束对水下工程进行测量，且建成后的整体运行情况很少受到关注。应用多波束测深系统对建成后4年的长江铰链沉排护岸工程运行状况进行扫测，通过与建成时地形进行对比，观察工程经历多个汛期后的稳定情况。对比结果是断面形状比较稳定，达到了设计的效果。

Underwater engineering surveying is usually to use single-beam echo sounders and a little attention is paid to the engineering after completion. A multi-beam echo sounder is used to survey the engineering of precast concrete slabs connected with hinges to protect the Yangtze River embankment of Nanjing river stretch which has been built for four years. Through the contrast of the terrain of cross-sections among a recent observation and before construction and after construction, the form of cross-sections and the engineering area are stable, the design indexes reach the desired effects.