Hydraulic Simulation of Step–Pool Channels in Mountain Streams Using High-Density Topographic Observation

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Key Points

This research aims to develop a method for accurately simulating flow dynamics in step-pool channels using detailed topographic data.
Conducted field observations and numerical analysis to capture high-resolution flow fields.
Surveyed 60 cross-sections with 1000 measurement points using smartphone LiDAR.
Integrated topographic data to create 3D terrain and conducted flow simulations with iRIC Nays2D.
Adjusted roughness parameters using observed flow rates and water surface elevations.
Achieved a root mean square error (RMSE) of 3.3 cm in water depth distribution.
Effectively reproduced flow conditions specific to mountain streams, including sharp water level drops and reduced flow zones.
Demonstrated significant performance decline in simulations with reduced measurement density, increasing RMSE to 4.2 cm and 5.9 cm.

Analysis demonstrates hydraulic simulation accuracy in mountain streams, highlighting effective observation methods.

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Wakamatsu et al. (2026) studied this question.

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