Wave-frequency flows within a near-bed vegetation canopy

摘要

We study water flows and wave dissipation within near-bed pneumatophore canopies at the wave-exposed fringe of a mangrove forest on Cu Lao Dung Island, in the Mekong Delta. To evaluate canopy drag, the three-dimensional geometry of pneumatophore stems growing upward from the buried lateral roots of Sonneratia caseolaris mangroves was reconstructed from photogrammetric surveys. In cases where hydrodynamic measurements were obtained, up to 84 stems per square meter were observed, with stem heights < 0.6 m, and basal diameters 0.01-0.02 m. The parameter a = (frontal area of pneumatophores blocking the flow)/(canopy volume) ranged from zero to 1.8 m(-1). Within-canopy water velocity displayed a phase lead and slight attenuation relative to above-canopy flows. The phase lead was frequency-dependent, ranging from 0 to 30 degrees at the frequencies of energetic waves (> 0.1 Hz), and up to 90 degrees at lower frequencies. A model is developed for wave-induced flows within the vertically variable canopy. Scaling suggests that acceleration induced forces and vertical mixing were negligible at wave frequencies. Consistent with theory, drag-induced vertical variability in velocity scaled with A = T-w/(2 pi T-f), where T-w = wave period, T-f = 2/(C(D)a vertical bar u vertical bar) is the frictional time scale, CD; 1 2 is the drag coefficient, and vertical bar u vertical bar is a typical flow speed. For fixed wave conditions (vertical bar u vertical bar and T-w), theory predicts increasing dissipation with increasing vegetation density (i.e. increasing a), until a maximum is reached for order-one A. For larger A, within-canopy flow is so inhibited by drag that further increases in a reduce within-canopy dissipation. For observed cases, Lambda <= 0.38 at energetic wave frequencies, so wave dissipation near the forest edge is expected to increase with increasing pneumatophore canopy density. However, under different wave conditions, the most dense canopies may occasionally approach the dissipation maximum (Lambda approximate to 1). Predicted dissipation by the pneumatophore canopy was sufficient to attenuate most wave energy over distances slightly less (more) than 100 m into the marsh in 1 m (2 m) water depth.