On the Drag Force of Flows over Engineered Log Jams
Publication: World Environmental and Water Resources Congress 2024
ABSTRACT
Engineered log jams (ELJs) using large wood (LW) are widely used in stream and watershed restoration projects. ELJs can create diverse eco-hydraulic and scouring conditions that may benefit aquatic habitat and provide stream bank protection. They are also economical as the materials are usually locally available. The use of ELJs, however, has its challenges. For example, the potential complex shapes (size, shape, placement location, etc.) make their impact on local flow and morphological conditions difficult to estimate, leading to the lack of good guidelines of their installation for a given restoration site. In this study, a practical, semi-automatic, 3D CFD model is used to simulate complex flows through ELJs. The purpose is to examine the ability of CFD model to compute the drag force acting on an ELJ under a giving a set of conditions, so that a better understanding of the ELJ drag force may be gained. Such knowledge is critical in developing a reliable method to represent ELJs in 2D depth-averaged numerical models which are the practical design tools for stream restoration projects in the foreseeable future.
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Information
Published In
World Environmental and Water Resources Congress 2024
Pages: 846 - 854
History
Published online: May 16, 2024
ASCE Technical Topics:
- Computational fluid dynamics technique
- Construction engineering
- Construction management
- Continuum mechanics
- Ecological restoration
- Ecosystems
- Engineering fundamentals
- Engineering mechanics
- Environmental engineering
- Flow (fluid dynamics)
- Flow simulation
- Fluid dynamics
- Fluid mechanics
- Hydraulic engineering
- Hydrologic engineering
- Models (by type)
- Project management
- River bank stabilization
- River engineering
- Rivers and streams
- Three-dimensional models
- Water and water resources
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