Multibeam echosounder (MBES) for mapping subaqueous topography in rivers, lakes and seas

我们申请经费购买一台多波束回声测深仪。该仪器测量河流、湖泊或沿海海域几到几米宽（取决于水深）的相对深度。将相邻的轨迹结合起来，就能以厘米级的精度绘制出河床、湖底或海底的地形图。信号从探测头同时发送和接收，在140度的范围内产生512个独特的探测。原则上，它结合了许多传统的回声探测仪，但这些信号可以绘制出水下表面的完整地图——这是单波束探测仪实际上不可能做到的。根据温度、压力、声速变化和船只运动对测深结果进行校正。处理软件允许将相对深度校正为当地大地基准。

We request funds for a multibeam echosounder (MBES). The instrument measures relative depth in rivers, lakes or coastal seas in 'swaths' several to many meters wide (depending on water depth). Combining adjacent tracks enables one to make a map of the topography of a channel bed, lake bottom or sea floor with centimeter precision. Signals are simultaneously sent and received from a sounding head that produces 512 unique soundings across a 140 degree swath. In principle, it combines many conventional echo-sounders, but the signals permit a complete map of the subaqueous surface to be made - something not practically possible with a single-beam sounder. The soundings are corrected for temperature, pressure, sound velocity changes and boat motion. Processing software allows relative depths to be corrected to local geodetic datums.