complex culverts have a change of section (transition) at one or more positions along their lengths. the hydraulic performance cannot be estimated using simple culvert methods because the transition may change the control point. by modeling the flow through a transition as free flow, sluice flow, pipe flow and treating a complex culvert, as a series of simple culverts with the appropriate hydra...

Stream restoration often focuses on increasing habitat heterogeneity to reverse ecosystem degradation. However, the connection between heterogeneity and ecosystem structure and processes is poorly understood. We looked to investigate this interaction from both applied and basic science perspectives. For the applied study, we examined two culvert replacements designed to mimic natural stream cha...

The outlet pressure box culvert is often used as the drainage building of a pumping station. Because its compact structure, it produces transverse flow velocity and then forms poor patterns, such bias flow, reflux, separation, which affect discharge efficiency Based on combination physical model test numerical simulation, hydraulic characteristics an eccentric tapering were analyzed. Focusing p...

Abstract The main problem of road construction on saturated soft soils is due to their low bearing capacity and large settlement. One the solutions such problems install piled box culverts-geofoam. In this study, pile culvert-geofoam was modelled as raft foundation. This experimental study conducted by making a prototype file foundation gradually loaded with maximum vertical load 20 kN. Differe...

Living just under the moor, I have always known that drainage can cause problems. There are a number of obvious culverts near the house, and a well and sump in the front garden. But it was not until we excavated to create more space around the front door that we discovered the true extent of the drainage system, which must be Victorian if not older. There is a culvert running parallel to the ho...

Artificial reefs continue to be added as habitat throughout the world, yet questions remain about how reef design affects fish diversity and abundance. In the present study, the effects of reef density were assessed for fish communities and sizes of economically valuable Lutjanus campechanus 13 km off Port Mansfield, Texas, at a reef composed of more than 4000 concrete culverts. The study spann...

A computational fluid dynamics (CFD) model of a railway culvert was established based on the two-phase flow theory to investigate wind-blown sand transport and sedimentation in around culvert. Then field accumulation distribution particles were analyzed through numerical simulation. The results show that can be divided into deceleration, acceleration, vortex areas. curve horizontal wind speed a...