A stem spacing-based non-dimensional model for predicting longitudinal dispersion in low-density emergent vegetation

Acta Geophysica

F. Sonnenwald¹  V. Stovin¹  I. Guymer¹ 

[1] University of Sheffield

关键词: Stem spacing;    Longitudinal dispersion;    Solute transport;    1D modelling;    Vegetated flows;    Cylinder arrays;   

DOI  :  10.1007/s11600-018-0217-z

学科分类：地球科学(综合)

来源: Polska Akademia Nauk * Instytut Geofizyki

【 摘 要 】

Predicting how pollutants disperse in vegetation is necessary to protect natural watercourses. This can be done using the one-dimensional advection dispersion equation, which requires estimates of longitudinal dispersion coefficients in vegetation. Dye tracing was used to obtain longitudinal dispersion coefficients in emergent artificial vegetation of different densities and stem diameters. Based on these results, a simple non-dimensional model, depending on velocity and stem spacing, was developed to predict the longitudinal dispersion coefficient in uniform emergent vegetation at low densities (solid volume fractions < 0.1). Predictions of the longitudinal dispersion coefficient from this simple model were compared with predictions from a more complex expression for a range of experimental data, including real vegetation. The simple model was found to predict correct order of magnitude dispersion coefficients and to perform as well as the more complex expression. The simple model requires fewer parameters and provides a robust engineering approximation.

【 授权许可】

Unknown