Direct visualization of hyporheic exchange in an emergent vegetation canopy
Part Of
River Flow - Proceedings of the 11th Conference on Fluvial Hydraulics, 2022
Start Page
716
End Page
723
ISBN
9781003323037
Date Issued
2024
Author(s)
Yang, J.Q.
Abstract
Aquatic vegetation has been used to restore streams, stabilize riverbanks, and improve water quality. Field studies show that aquatic vegetation increases the in-stream transient storage in the hyporheic zone. However, the impact of vegetation on hyporheic exchange has not been quantified due to a lack of direct visualization of the three-dimensional (3D) pathway of hyporheic exchange in channels with vegetation. The goal of this study is to quantify hyporheic exchange induced by emergent vegetation through visualization in a laboratory flume. We proposed three probable mechanisms by which emergent vegetation impacts hyporheic exchange. To validate our hypotheses, we developed a refractive index match-based method to directly image the trajectories of fluorescent dye in a channel filled with transparent gravel sediment made from hydrogel beads and translucent acrylic vegetation dowels.
Event(s)
11th International Conference on Fluvial Hydraulics, River Flow 2022, 8 November 2022 - 10 November 2022, Kingston
Publisher
CRC Press/Balkema
Type
conference paper