Related Experiment Video
Updated: Jun 25, 2026

Visualizing Hyporheic Flow Through Bedforms Using Dye Experiments and Simulation
Published on: November 18, 2015
Application of computational fluid dynamic to model the hydraulic performance of subsurface flow wetlands
Liwei Fan1, Reti Hai, Wenxing Wang
1Center of Resources and Environment, Beijing University of Chemical Technology, Beijing 100029, China. fanlw@163.com
Abstract:
A subsurface flow wetland (SSFW) was simulated using a commercial computational fluid dynamic (CFD) code. The constructed media was simulated using porous media and the liquid resident time distribution (RTD) in the SSFW was obtained using the particle trajectory model. The effect of wetland configuration and operating conditions on the hydraulic performance of the SSFW were investigated. The results indicated that the hydraulic performance of the SSFW was predominantly affected by the wetland configuration. The hydraulic efficiency of the SSFW with an inlet at the middle edge of the upper media was 0.584 and the best among the SSFWs with an inlet at the top, the middle, and the bottom edge of the upper media. The constructed media affected the hydraulic performance by the ratio (K) of the upper and lower media resistance. The selection of appropriate media resistance in the protection layer can improve the hydraulic efficiency. When the viscous resistance coefficient of the media in the protection layer changed from 2.315 x 10(5) to 1.200 x 10(8), the hydraulic efficiency of the SSFW increased from 0.301 to 0.751. However, the effect of operating conditions on the hydraulic efficiency of the SSFW was slight.
Related Concept Videos
Design Example: Creating a Hydraulic Model of a Dam Spillway
Typical Model Studies
Rapidly Varying Flow
Hydraulic Jump: Problem Solving
Weir: Problem Solving
Gradually Varying Flow

