This paper describes the fundamental characteristics of an open channel in a tidal flat. In this study, the open channel was characterized using a topographic survey. Because of the limited resources available and special measurement conditions at the study area, cranes and cables were used to transport a sounding weight to the measurement point, and pressure gauges hanging on the sounding weight were used to measure the water depth. The coordinates and altitude of the surface point above the sound weight were measured using a total station. The kriging interpolation was applied to discrete geographic data to create contour lines and a topographic map of the open channel in the tidal flat. This methodology is simple, accurate, and cost-effective. Therefore, the developed methodology and theory can be applied to bathymetry measurements of river terrains with similar conditions.

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