Quantifying Streambed Hydrological Exchange Flows Using Structure-From-Motion Photogrammetry and Computational Fluid Dynamics Modeling

摘要: Streambed hydrological exchange flows (HEFs) are the exchange fluxes of water and concentration at the water-sediment interface. These fluxes are the primary control of nutrient dynamics, carbon cycles, and ecosystem health in dynamic riverine ecosystems. Despite their importance, quantifying HEFs at streambeds in a fast and accurate manner is still a challenge. To explore new directions, this work aims to establish a framework that enables HEFs prediction by combining structure-from-motion (SfM) photogrammetry and computational fluid dynamics (CFD) modeling. Specifically, the SfM photogrammetry was used to obtain millimeter to centimeter-scale resolution riverbed topography such that the sizes and shapes of fine-scale sediments can be measured and parameterized. With such a high-resolution riverbed, hyporheicFoam, a fully coupled groundwater-surface water CFD code in OpenFOAM, was then …