The paper presents the results of a series of experiments conducted on physical models of Quarter-circle breakwater (QBW) in a two dimensional monochromatic wave flume. The purpose of the experiments was to evaluate the reflection coefficient Kr of QBW models of different radii (R) for different submergence ratios (d/hc), where d is the depth of water and hc is the height of the breakwater cres...

I. INTRODUCTIONThe Parshall Flume, which was invented in 1920 by R. Parshall, is mostly used wastewater and crop supply. Utilizing equations, established dimensions that fit the design, one of advantages conversion position energy to velocity since other measurement structures there are minimum losses this it does not allow sedimentation.
 The structuring project adhered different models d...

Microsensors, including a recently developed NO3(-) biosensor, were applied to measure O(2) and NO3(-) profiles in marine sediments from the upwelling area off central Chile and to investigate the influence of Thioploca spp. on the sedimentary nitrogen metabolism. The studies were performed in undisturbed sediment cores incubated in a small laboratory flume to simulate the environmental conditi...

Background: The stabilization of fine sediments via biofilms (‘biostabilization’) has various economic and ecological implications but is presently unaddressed within lotic waters. To investigate natural biofilm growth and functionality in freshwater sediments under controlled boundary conditions, a unique mesocosm was constructed that combines established know-how from engineering and natural ...

The influence of woody debris on channel morphology and aquatic habitat has been recognized for many years. Unlike sediment, however, little is known about how wood moves through river systems. We examined some dynamics of wood transport in streams through a series of flume experiments and observed three distinct wood transport regimes: uncongested, congested and semi-congested. During unconges...

Distributed Information Flow Control (DIFC) is a systemlevel security mechanism that can simplify program security but requires that a programmer supply policy code in any programs it helps to secure. Writing this policy code is not a simple matter, and is thus likely to consume significant programmer attention and introduce bugs. Thus do we implement Boat, a means to simplify DIFC programming....

This paper presents the new boundary condition implemented in the LNEC (Laboratório Nacional de Engenharia Civil) SPH (Smoothed Particle Hydrodynamics) numerical model based on the SPHysics model and on a standard SPH formulation: This piston-type wave-maker now includes dynamic wave absorption and allows the simulation of a semi-infinite flume. Verification of the active wave-maker absorption ...

As a debris-flow control and mitigation countermeasure, flexible net barriers can effectively mitigate debris flows. The interception characteristics of barrier play an important role in engineering design. Many influencing factors exist processes. In order to explore the most factors, flume-based experimental study was carried out by selecting four main i.e., flume slope, flow bulk density, in...

Pools are often observed in gravel-bed rivers, together with the presence of vegetation patches. In present study, a conceptual model gradual varied flow both convective deceleration and acceleration sections has been constructed flume to study turbulent structures. Vegetation patches extended canopies were planted pool order increase thickness boundary layer inside inner zone. The effects diff...