منابع مشابه
Respiratory disease and particulate air pollution in Santiago Chile: contribution of erosion particles from fine sediments.
Air pollution in Santiago is a serious problem every winter, causing thousands of cases of breathing problems within the population. With more than 6 million people and almost two million vehicles, this large city receives rainfall only during winters. Depending on the frequency of storms, statistics show that every time it rains, air quality improves for a couple of days, followed by extreme l...
متن کاملErosion Mechanisms in Marine Sediments
Erosion of intertidal sediments may be influenced by several factors. In this study, the influence on sediment erosion of some physical mechanisms such as the sediment bed roughness, suspended particles and surface waves was investigated. Because of the complexity of the phenomena involved, careful experiments have been planed in order to make each mechanism dominant and to assess its contribut...
متن کاملFormation of a sandy near-bed transport layer from a fine-grained bed under oscillatory flow
[1] Bed surface coarsening was found to be an important effect for the formation of ripples and the dynamics of the boundary layer above a predominantly silt-sized sediment bed (median particle size equal to 26 mm; 20% fine sand, 70% silt, 10% clay) under oscillatory flow (with orbital velocities of 0.32–0.52 m/s) in a laboratory wave duct. Following bed liquefaction, substantial winnowing of t...
متن کاملErosion of biofilm-bound fluvial sediments
The movement of fluvial sediment shapes our rivers. Understanding sediment entrainment has been a goal of hydraulic engineers for almost a century1,2. Previous sediment entrainment models have been informed by laboratory experiments using grains that were free from biological material3. In natural river settings, however, sediments are invariably covered by bacteria, often forming visible biofi...
متن کاملAccounting for Rough Bed Friction Factors of Mud Beds as a Result of Biological Activity in Erosion Experiments
The average bed shear stress and bed friction factor of samples with any roughness was derived from the head loss between upstream and downstream of a test section in an erosion tunnel. The method was validated in both hydraulically smooth (plexiglass; Reynolds number less than 25,000) and rough regimes (calibrated particles with known roughness). As a first step toward using this method on nat...
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ژورنال
عنوان ژورنال: E3S Web of Conferences
سال: 2018
ISSN: 2267-1242
DOI: 10.1051/e3sconf/20184005058