Propagules go with the flow: Near‐field particle dispersion in reaches with different hydrodynamic conditions

IF 3.8 1区 地球科学 Q1 LIMNOLOGY
Christopher R. Farrow, Loong‐Tak Lim, Josef D. Ackerman
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引用次数: 0

Abstract

We examined the effects of riverbed roughness and turbulence (shear velocity, ) on propagule dispersion in the near‐field region (< 100 m) by releasing microbead models of larval and juvenile unionid mussels in tributaries of the Grand River (Ontario, Canada). The Conestogo River had the roughest bed and highest mean , followed by the Grand and Speed rivers. We predicted more downstream transport with higher velocities and that longitudinal dispersion coefficients (Kx) would match the patterns in roughness and . The Conestogo River had the highest downstream particle flux and Kx as predicted by simple empirical equations. Inconsistent with model predictions, however, the Grand River had the lowest particle flux and Kx. These differences were greater than expected based on the small differences in reach‐averaged mean velocities between the Grand and Conestogo rivers. This mismatch between Kx predicted by simple empirical models and those fit to an advection–diffusion model was related to the inertial properties of the flow in the advective zone (i.e., near field) of the reaches. Streamwise, lateral, and especially vertical velocities at drift nets were spatially heterogeneous within and among reaches, demonstrating the influence of the flow direction on particle flux. Although bulk fluid statistics provided a useful indication of how dispersal distances vary among rivers, our results suggest that near‐field dynamics can be complex, requiring high‐resolution bathymetry and velocity data for the development of improved advection–diffusion models. Care should be exercised in predicting the dispersal of particles at ecologically relevant spatial scales in rivers.
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来源期刊
Limnology and Oceanography
Limnology and Oceanography 地学-海洋学
CiteScore
8.80
自引率
6.70%
发文量
254
审稿时长
3 months
期刊介绍: Limnology and Oceanography (L&O; print ISSN 0024-3590, online ISSN 1939-5590) publishes original articles, including scholarly reviews, about all aspects of limnology and oceanography. The journal''s unifying theme is the understanding of aquatic systems. Submissions are judged on the originality of their data, interpretations, and ideas, and on the degree to which they can be generalized beyond the particular aquatic system examined. Laboratory and modeling studies must demonstrate relevance to field environments; typically this means that they are bolstered by substantial "real-world" data. Few purely theoretical or purely empirical papers are accepted for review.
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