Hydraulic properties affected by litter and stem cover under overland flow

Abstract

Vegetation stems and litter cover have different effects on sediment transport capacity under the same experimental conditions, which in essence, may be due to differences in their hydraulic properties, but the availability of comparative studies is limited. This study aimed to compare the hydraulic properties affected by litter and stem cover, compare differences in the drag forces exerted by litter and stems on overland flow, and develop new Manning's n and flow velocity equations for litter cover. Two series of flume experiments were conducted with the same slope gradients (8.8%, 17.6%, 26.8%) and flow discharge rates (0.5, 1.0 × 10 −3 m 3 s −1). Artificial Gramineae stems with a 0%-30% cover level and Pinus tabulaeformis litter with a 0%-70% cover level were used in series 1 and series 2, respectively. The flow veloc

Experimental study on the effect of simulated grass and stem coverage on resistance coefficient of overland flow

“…Ding and Li (2016) also found that there was little difference in Re on slopes with different grass cover, and identified that Re increased with the rise of discharge. Ding et al (2021) reached a similar conclusion. found no obvious trend between Re and the amount of litter after having conducted experimental tests simulating rainfall on a slope covered by litter.…”

Near surface roughness estimation: A parameterization derived from artificial rainfall experiments and two-dimensional hydrodynamic modelling for multiple vegetation coverages

“…A newer formulation describing depth-dependent roughness based on the Manning equation has been provided by Fu et al (2019). Later the equation has been adapted to be valid for litter cover (Ding et al, 2021). Fu conducted several laboratory experiments for a vegetation cover from 0 to 30% with artificial plants with a height of 12 cm.…”