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- Title
Effects of simulated submerged and rigid vegetation and grain roughness on hydraulic resistance to simulated overland flow.
- Authors
Yang, Ping-ping; Zhang, Hui-lan; Ma, Chao
- Abstract
Better understanding of the role of vegetation and soil on hydraulic resistance of overland flow requires quantitative partition of their interaction. In this paper, a total of 144 hydraulic flume experiments were carried out to investigate the hydraulic characteristics of overland flow. Results show that hydraulic resistance is negatively correlated with Reynolds number on non-simulated vegetated slopes, while positively on vegetated slopes. The law of composite resistance agrees with the dominant resistance, depending on simulated vegetation stem, surface roughness, and discharge. Surface roughness has greater influence on overland flow resistance than vegetation stem when unit discharge is lower than the low-limited critical discharge, while vegetation has a more obvious influence when unit discharge is higher than the upper-limited critical discharge. Combined effects of simulated vegetation and surface roughness are unequal to the sum of the individual effects through t-test, implying the limitation of using linear superposition principle in calculating overland flow resistances under combined effect of roughness elements.
- Subjects
HYDRAULICS; FLUID flow; PLANTS; REYNOLDS number; SUPERPOSITION principle (Physics)
- Publication
Journal of Mountain Science, 2017, Vol 14, Issue 10, p2042
- ISSN
1672-6316
- Publication type
Article
- DOI
10.1007/s11629-016-4280-0