Work

Estimation of friction factor and bed shear stress considering bedform effect in rivers

Year: 2024

Type: article

Abstract: The roughness height plays a crucial role, especially in shallow‐water environments with rough‐bed conditions. Specifically, it is a key parameter for predicting flow velocity and bed shear stress. Therefore, an accurate determination of roughness height is essential for precise predictions of hydraulic phenomena. In this study, we propose a method to estimate form roughness height and friction factor using bathymetry data, with a focus on cross‐sectional data in the transverse direction. To overcome the limitations of using lateral direction data, we derived an empirical formula for estimating bedform length from the bed profiles in the streamwise direction. To assess the validity of bedform analysis and estimated form roughness height based on lateral direction data, we compared the characteristics of bedform and form roughness height analysed using lateral direction data with those analysed using the streamwise direction data. Furthermore, we confirmed the importance of considering the form roughness height in estimating bed shear stress through a comparison with bed shear stress calculations considering only grain roughness height.

Source: Earth Surface Processes and Landforms

DOI: 10.1002/esp.5954

Authors: Minjae Lee, Yong Sung Park, Mikyung Lee, Yong‐Sik Song, Chanho Park

Institutions: Seoul National University, National Institute of Environmental Research, Institute of Construction and Environmental Engineering

Language: English

Topic: Hydrology and Sediment Transport Processes

Subfield: Ecology

Field: Environmental Science

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $5,080

Funders: National Institute of Environmental Research, Korea Institute of Marine Science and Technology promotion