Application Echo Sounders with Single Frequency of Klong Ban Na Lao

Abstract

The application of echo sounder is a method of determining the level in the bathymetric survey which water is obstruction that inevitable. such as ponds, reservoirs, canals, rivers or the sea etc., It must make a surveying the low height of the underwater soil surface to be presented as a topographic map and to calculate the desired surface volume. The main tools and equipment for measuring levels with depth instruments include: rowboat, network real time kinematic, and echo sounder. These instruments and equipment subject to surveying measurement and the precision resolution of the area survey, such as the vehicle carrying the equipment, rowboat, boat engine, an unmanned forced boat, submarine, an underwater drone, etc. The horizontal position instrument may be a theodolite, total station and can currently be used to measure with a network real time kinematic. Echo Sounder wave depth tool for measuring vertical distances can be divided into single frequencies, dual frequencies and multifrequency waves

This research used the application of echo sounder instruments with a single frequency wave to make a survey measuring for depth in ban Na Lao Canal. Which is deep 1-5 meters for bathymetric map, profiles and cross section. By calibration echo sounder for correction value at each distance of 1 meter, 2 meters and 3 meters at each distance 10 times, and the type of clearwater and turbid water. The total average correction value was -0.140±0.093 meters. When bathymetric survey in ban Na Lao canal, compared to the checkpoint, there was a discrepancy of -0.144 meter and the correction of the instrument test measurements was less inaccurate -0.046 meters. Conclusion measuring instrument for surveying must calibration.