The erosion threshold of sand-mud mixtures is investigated by analyzing the momentum balance a sand particle or mud parcel in mixture bed surface, and formula for critical shear stress developed, which also applies pure mud. developed suggests that variation over content mainly caused varying dry bulk density component mixture. reproduces well can predict both process consolidation. promises to...

Stochastic modeling of soil water fluxes in the absence of measured hydraulic parameters requires a knowledge of the expected istribution of the hydraulic parameters in different soil types. Predictive relationships describing the hydraulic parameter distributions must be developed based on the common descriptors of the physical properties of soils (e.g., texture, structure, particle size distr...

Following an oil spill on a sandy shoreline, an alternative technique to sediment excavation consists in relocating the contaminated sediment into the surf zone. The sediments are thus subjected to the natural cleaning action of the sea. Waves break down the piles of oily sand, separate the oil from the sediment, spread out the sediment over the beach and clean it by agitation and abrasion, whi...

The role of spatial distribution of porous medium patchwise chemical (charge) heterogeneity in colloid transport in packed bed columns is investigated. Colloid transport experiments with carboxyl latex particles flowing through columns packed with chemically heterogeneous sand grains were carried out. Patchwise chemical heterogeneity was introduced to the granular porous medium by modifying the...

The first granulometrical analysis of soil samples from nesting banks of the Malachite Kingfisher Alcedo cristata is reported. In total 56 samples from the Kinshasa area were analysed. Three standardised particle size fractions were determined in all groups of samples (percentage of sand, clay and silt). Mean particle percentage of soil samples from banks occupied by Malachite Kingfishers avera...

Auditory evoked potentials (AEP) were used to measure the hearing range and auditory sensitivity of the American sand lance Ammodytes americanus. Responses to amplitude-modulated tone pips indicated that the hearing range extended from 50 to 400 Hz. Sound pressure thresholds were lowest between 200 and 400 Hz. Particle acceleration thresholds showed an improved sensitivity notch at 200 Hz but n...

heavy metals due to their non biodegradability properties and can accumulate in living tissues, thus becoming concentrated throughout the food chain and can be readily absorbed into the human body. among them manganese was examined in this study as a pollutant. the aim of this study is the manganese removal from aqueous solution using a windy sand fixed bed column of sistan plain. flow rate, in...

The properties of nanoparticles, however, are not only dependent on their size and shape, but also are determined by surface modification. As a novel in-depth profile control agent, nanoscale water-soluble cross-linked polyacrylamide microsphere has better compatibility, sealing and oil property. To improve the salt tolerances and shearing resistance, hydrophobic monomer is introduced to invers...

Plant sand fixation is the most durable and environmentally friendly mitigation measure for windblown hazards. For aeolian–sand composite soil, fines content main factor affecting pore size distribution characteristics determines soil water retention characteristics. Sandy with uniform particle was used as material, low-plasticity clay a fine particle, soils different were prepared. The evoluti...