Relevant bibliographies by topics / Large culvert

Academic literature on the topic 'Large culvert'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Contents

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Large culvert.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Large culvert"

1

Crook, Natasha, Stuart C. Cairns, and Karl Vernes. "Bare-nosed wombats (Vombatus ursinus) use drainage culverts to cross roads." Australian Mammalogy 35, no. 1 (2013): 23. http://dx.doi.org/10.1071/am11042.

Full text
Abstract:
Despite drainage culverts being numerous along highways, there is a scarcity of data evaluating their use as roadway underpasses by wildlife, including the bare-nosed wombat (Vombatus ursinus), a large marsupial that is involved in substantial numbers of vehicle collisions in New South Wales. Culvert use was measured with camera traps positioned at 19 drainage culverts along an 8-km stretch of ‘Thunderbolt’s Way’ near Nowendoc on the Northern Tableland, north-eastern New South Wales. The estimated probability of the occupancy/use of a culvert by a wombat was 0.46 ± 0.10. Culvert use was related to structural variables (e.g. diameter and length) and both the distance to the next adjacent culvert and to forest cover. This suggests that wombats readily use drainage culverts to cross under roads and that these structures could be modified (e.g. by maintaining proximate forest cover) to increase the likelihood that wombats would use them, thus reducing vehicle collisions and road mortality of wombats.
APA, Harvard, Vancouver, ISO, and other styles
2

Ford, Adam T., and Anthony P. Clevenger. "Factors affecting the permeability of road mitigation measures to the movement of small mammals." Canadian Journal of Zoology 97, no. 4 (April 2019): 379–84. http://dx.doi.org/10.1139/cjz-2018-0165.

Full text
Abstract:
Mitigation measures, such as wildlife-exclusion fencing and crossing structures (overpasses, underpasses, culverts), have been widely demonstrated to reduce the negative effects of roads on medium-sized and large animals. It is unclear how these mitigation measures influence the movement of small mammals (<5 kg). Our study has three objectives: (1) to test whether culverts improve highway permeability; (2) to determine factors associated with culvert use, such as culvert obstruction by snow; (3) to evaluate factors contributing towards fence permeability, such as the presence of a culvert, snow depth, and fence mesh size. We used snow tracking to assess the movement for four small-mammal taxa along the Trans-Canada Highway corridor in Banff National Park, Alberta, Canada. We found that the presence of a culvert within 100 m of transects significantly improved fence and highway permeability. Obstruction of the culvert entrance by snow was negatively correlated with the probability of use, and therefore, of highway permeability. Furthermore, the mesh size of the fencing did not affect fence or highway permeability. We recommend that culvert entrances be located on the outside of fenced right-of-ways to reduce obstruction by highway maintenance activities such as snowplowing.
APA, Harvard, Vancouver, ISO, and other styles
3

Ho, H. C., M. Muste, S. Plenner, and A. R. Firoozfar. "Complementary experiments for hydraulic modeling of multi-box culverts." Canadian Journal of Civil Engineering 40, no. 4 (April 2013): 324–33. http://dx.doi.org/10.1139/cjce-2012-0201.

Full text
Abstract:
Culvert design must account for a large range of flow rates but most of the time culverts convey flows that are smaller than the design flow. Repeated high flows passing through the culverts lead to a gradual increase of the sediment deposits in the culvert vicinity, eventually resulting in reduced flow and sediment capacity. Sedimentation at culverts is quite an involved process due to the combined effect of flow non-uniformity and unsteadiness, as well as of the flow–sediment interaction. This paper reports results from a series of laboratory experiments aimed at understanding the hydro and morpho-dynamic changes occurring in the vicinity of a three-box culvert. For this purpose, velocity and turbulence characteristics upstream of the culvert were mapped globally and locally during the transition from an original flatbed to equilibrium sediment transport condition using contemporary acoustics, light detection and ranging, and image-based technologies. The experimental results reveal flow complexities not currently accounted for in the design of the multi-barrel culverts, but which can be detrimental for their long-term operation. Considerations on practical approaches to efficiently model the complexities were formulated.
APA, Harvard, Vancouver, ISO, and other styles
4

Xu, Jiancong, Huihao Xue, and Guorong Rui. "Theoretical Analysis of Rock Blasting Damage in Construction of Tunnels Closely Under-Passing Sewage Box Culverts." Applied Sciences 12, no. 19 (September 30, 2022): 9875. http://dx.doi.org/10.3390/app12199875.

Full text
Abstract:
With the large-scale construction of urban traffic tunnels in China, it has become common to underpass existing buildings and structures such as sewage box culverts and pipelines using the drilling-blasting method. How to analyze accurately the blasting damage of surrounding rock and reasonably determine the safe distance between tunnel and box culvert or pipelines is an urgent issue to be solved. In this paper, the Cowper-Symonds plastic kinetic hardening model was improved using both rock initial damage degree and damage modification coefficient considering rock residual strength. The proposed model was implemented into LS-DYNA. The proposed damage model was used to evaluate the blasting construction of rock tunnels closely under-passing sewage box culverts. The results of numerical simulation using the proposed damage model shows that the blasting damage range of rock with a damage degree of more than 0.5 very significantly reduces from 1.0 m to 0.3 m as the spacing between the box culvert and the tunnel increases from 1.0 m to 4.0 m, and the evolution process of rock blasting damage can be well-presented. Moreover, the safe distance between tunnel and box culvert in blasting construction can be reasonably determined to be no less than 4.0 m. The findings in this paper could be significant for guiding the blasting construction of rock tunnels closely under-passing sewage box culverts.
APA, Harvard, Vancouver, ISO, and other styles
5

Gultom, J., Pratikso, and A. Rochim. "Floating road construction on soft soil." IOP Conference Series: Earth and Environmental Science 955, no. 1 (January 1, 2022): 012016. http://dx.doi.org/10.1088/1755-1315/955/1/012016.

Full text
Abstract:
Abstract The main problem of road construction on saturated soft soils is due to their low bearing capacity and large settlement. One of the solutions to such problems is to install piled box culverts-geofoam. In this study, the pile box culvert-geofoam was modelled as raft foundation. This experimental study was conducted by making a prototype raft file foundation gradually loaded with a maximum vertical load of 20 kN. Different thicknesses of geofoam were utilized in order to observe the influence of thickness on the settlement. Furthermore, difference in settlement is also found when the culvert was constructed with and without geofoam. Thicker geofoam was observed to result in smaller settlement.
APA, Harvard, Vancouver, ISO, and other styles
6

Zheng, Jun Jie, De Pi Luo, and Qiang Ma. "Numerical Analysis of Slab Culvert Beneath Imperfect Ditch Covered with Geogrid Layers." Applied Mechanics and Materials 71-78 (July 2011): 3338–41. http://dx.doi.org/10.4028/www.scientific.net/amm.71-78.3338.

Full text
Abstract:
The overburden of high embankment culvert is over 10 m, such high fill always leads large earth pressure on the slab of the culvert. The imperfect ditch covered with geogrid method was employed to reduce the vertical earth pressure on the slab. A series of numerical analyses were performed to investigate the load reduction effect of the imperfect ditch. In the simulation, the number of geogrid layers, the geometry of the load reduction ditches, as well as the location and the stiffness of the geogrid are investigated to analyse the influences on the vertical earth pressures. The results show that the slope angle and the height of the ditch, the plane stiffness of the geogrid have great effect on the load reduction efficiency, ditches with higher height and a slope of 90°lead to a significantly reduction on vertical earth pressures on the crown of culverts. The width of load reduction ditch, number of geogrid layers, the location and spacing of the geogrids have little effect on load reduction, the results can provide references for load reduction of slab culvert.
APA, Harvard, Vancouver, ISO, and other styles
7

Hotchkiss, Rollin H., Emily A. Larson, and David M. Admiraal. "Energy Dissipation in Culverts by Forced Hydraulic Jump within a Barrel." Transportation Research Record: Journal of the Transportation Research Board 1904, no. 1 (January 2005): 124–32. http://dx.doi.org/10.1177/0361198105190400113.

Full text
Abstract:
Riprap and concrete stilling basins are often built at culvert outlets to keep high-energy flows from scouring the streambed. Two simple alternatives to large basins are examined: a horizontal apron with an end weir and a drop structure with an end weir. The two designs are intended to reduce the flow energy at the outlet by inducing a hydraulic jump within the culvert barrel without the aid of tailwater. This research examines the jump geometry and the effectiveness of each jump type and proposes a design procedure for practicing engineers. The design procedure is applicable to culverts with approach Froude numbers from 2.6 to 6.0. Both designs are effective in reducing outlet velocity 0.7 to 8.5 ft/s (0.21 to 2.59 m/s), momentum 10% to 48%, and energy 6% to 71%. The design layouts allow easy access for maintenance activities.
APA, Harvard, Vancouver, ISO, and other styles
8

Byrne, Peter M., D. L. Anderson, and Hendra Jitno. "Seismic Analysis of Large Buried Culvert Structures." Transportation Research Record: Journal of the Transportation Research Board 1541, no. 1 (January 1996): 133–39. http://dx.doi.org/10.1177/0361198196154100117.

Full text
Abstract:
Field experience indicates that large buried culverts have suffered essentially no damage during past earthquakes when no significant permanent ground movements have occurred. These soil structures, which generally comprise steel or concrete arch members and engineered soil, may have spans of 15 m. Static, pseudodynamic, and dynamic finite-element analyses have been carried out on these structures and indicate that for horizontal seismic loading, the surrounding soil is much stiffer than the arch and results in the seismic load being taken by the soil rather than by the arch. Under vertical seismic loading, the arch is stiffer than the surrounding soil and attracts significant load, which can essentially be accounted for by increasing the unit weight of the soil in proportion to the vertical acceleration. Thrusts and moments in a 10-m concrete arch are examined under combined static and seismic loading (both horizontal and vertical). The results indicate that significant increases in thrust and moment in the arch are predicted for peak ground accelerations in excess of 0.3 g. The good behavior of these structures under such acceleration levels in California, where they are not specifically designed for earthquake forces, indicates that their static design includes sufficient reserve to prevent failure under accelerations of these levels.
APA, Harvard, Vancouver, ISO, and other styles
9

Chen, Bao Guo, Jun Jie Jiao, Ding Bao Song, and Jun Zhang. "Numerical Simulation on Soil Arch Effect and Load Reduction Mechanism Using EPS of High Fill Culvert." Applied Mechanics and Materials 701-702 (December 2014): 879–87. http://dx.doi.org/10.4028/www.scientific.net/amm.701-702.879.

Full text
Abstract:
The stress-strain relationship of EPS board was analyzed. Theoretical analysis and numerical simulation (FE ABAQUS) were conducted to investigate the load reduction mechanism using EPS and soil arch effect of high fill culvert based on the constitutive relation of EPS board. The results show that the numerical analysis results are consistent with the theory analysis. It shows that the soil arch forms over the culvert top and partial weight of the soil column exactly over the culvert has been transferred to the outer soil column via the soil arch during the yield stage of EPS board, which produce large deformation. Furthermore, the numerical simulation by using particle flow discrete element software (PFC2D) was conducted to investigate the soil arch effect over the culvert top. The research reveals that the EPS board is at elastic state and the soil arch effect on culvert top is not obvious at low fill. With the increasing of the fill over the culvert, the EPS board becomes into the yield state, the soil arch effect over the culvert increases and the earth pressure on culvert reduces gradually.
APA, Harvard, Vancouver, ISO, and other styles
10

Нarkusha, Mykola, Mykola Klymenko, and Artur Onyshchenko. "ANALYSIS OF THE TECHNICAL STATE OF HYDROTECHNICAL STRUCTURES OF TRANSPORTATION CONSTRUCTION FROM ROAD WATER PERFORMANCE PIPES FROM THE INFLUENCE OF CORROSION." AUTOMOBILE ROADS AND ROAD CONSTRUCTION, no. 111 (June 30, 2022): 164–73. http://dx.doi.org/10.33744/0365-8171-2022-111-164-173.

Full text
Abstract:
Hydrotechnical structures of transport construction from road culverts are designed for transporting and diverting water from transport structures. One of the main factors affecting the durability of a road culvert is corrosion of the metal of the pipe itself. With the increase in the number of hydraulic engineering structures of transport construction from road culverts on roads, the issue of ensuring the reliability and durability of their operation during operation becomes of particular importance, as there is a large number of deformations, as well as cases of complete destruction of pipes under embankments. World experience shows that corrosion damage is an extremely important problem and requires an appropriate response at a very early stage of development.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "Large culvert"

1

Gorecki, Vanessa. "The ecology and conservation of the large-footed Myotis (Myotis macropus) in an urban environment." Thesis, Queensland University of Technology, 2020. https://eprints.qut.edu.au/207163/1/Vanessa_Gorecki_Thesis.pdf.

Full text
Abstract:
The large-footed myotis (Myotis macropus) is a specialist trawling bat that can be found roosting in concrete culverts under roads, throughout urban environments. This study used a multidisciplinary approach to investigate culvert roost selection and urban landscape use by a specialist species in a subtropical city. The foundational ecological information detailed in this thesis concerning culvert roost selection and availability, urban movement patterns and gene flow between culvert roosts, will assist in planning future urban conservation initiatives of this specialist bat.
APA, Harvard, Vancouver, ISO, and other styles
2

Krtek, Jiří. "Numerická analýza přesypávaných mostních konstrukcí." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2014. http://www.nusl.cz/ntk/nusl-227153.

Full text
Abstract:
The topic of this Thesis is a study of the behavior of flexible metal large-span culverts during the construction and the operation. The aim is to analyze the behavior of the structure as a result of an unequally dropping support and a position of the load to the construction in relation to the soil cover height above the top of the steel construction. The Thesis is theoretical and based on the numerical parametric study.
APA, Harvard, Vancouver, ISO, and other styles
3

Taleb, Bahaa. "Behavior of large-span metal and reinforced concrete culverts under earth and live loadings." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/NQ58239.pdf.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Becerril, García DAVID. "INVESTIGATION OF CULVERT JOINTS EMPLOYING LARGE SCALE TESTS AND NUMERICAL SIMULATIONS." Thesis, 2012. http://hdl.handle.net/1974/7702.

Full text
Abstract:
The performance of joints in buried gravity flow pipelines are important since failure of these elements can affect the structural capacity of soil-pipe systems and reduce their longevity. Currently, there are no clear guidelines to design joints for gravity flow pipelines and therefore their design is based on semi-empirical methods. It is necessary to identify and quantify the demands that act across joints when subjected to service loading conditions to establish adequate design guidelines. Such demands will vary depending on the type of joint, type of pipe, burial and loading conditions. Therefore work is needed to investigate the influence of these conditions on the performance of joints. Full-scale laboratory tests have been performed on rigid (reinforced concrete) and flexible (corrugated steel and thermoplastic) pipelines to investigate the response of their joints when buried and subjected to surface loading. The joints investigated are either ‘moment-release’ joints (those that accommodate rotation and reduce the longitudinal bending moments close to zero), or ‘moment-transfer’ joints (those that limit rotation and transfer longitudinal bending moments from one pipe to the next). These experiments evaluate the influence of different cover depths, loading locations, and installation conditions on the response of the joints. Additionally, the performance of each joint when the pipeline was buried with shallow cover and subjected to surface loads up to and beyond fully factored loads were also investigated. Furthermore, three-dimensional finite element analyses of a gasketed bell and spigot joint in a buried reinforced concrete pipeline subjected to surface loading have been developed employing material properties and joint rotational characteristics experimentally obtained. The data obtained from the experimental and computational studies are used to evaluate joint performance and to identify key demands (shear force and rotation or moment) acting across them. In addition, the different patterns of vertical displacement along rigid and flexible pipes were established. It was found that the stiffness of the pipeline, the geometry of the joint, the loading and burial conditions influence the response (and therefore the demands) of the joints examined. Finally, recommendations are provided regarding development of structural design methods for these pipeline and joint systems.
Thesis (Ph.D, Civil Engineering) -- Queen's University, 2012-12-29 12:47:31.826
APA, Harvard, Vancouver, ISO, and other styles
5

Lougheed, ANDREA. "Limit States Testing of a Buried Deep-Corrugated Large-Span Box Culvert." Thesis, 2008. http://hdl.handle.net/1974/1663.

Full text
Abstract:
Results are reported from full-scale testing of a buried, deep-corrugated, large-span box culvert with a 2.4 m rise and 10.0 m span under controlled laboratory conditions. A total of twenty-one experiments were conducted on the structure, measuring its response without backfill, during backfilling, under a loaded tandem axle dump truck, and under simulated vehicle loading with force applied by an actuator. Surface strain measurements were used to calculate bending moments and thrusts, while deflections were monitored using an electronic theodolite. Tests conducted to a maximum force of truck loading specified by the Canadian Highway Bridge Design Code multiplied by a dynamic load allowance factor were performed at three cover depths. The maximum moment increased from 6 to 41 kNm/m as the cover was reduced from 1.5 to 0.45 m. This was attributed to less load distribution and decreased soil-structure system stiffness at shallower cover. The maximum bending moments were consistently observed directly beneath the applied force. Tests were also conducted at forces larger than the design values to identify the ultimate limit state(s) of the structure. An ultimate limit state was encountered at approximately 800 kN where the geotechnical resistance beneath the loading pads was exceeded. A subsequent test with the loading pad force spread over larger areas permitted larger forces to be applied. An ultimate limit state of the structure involving the formation of three plastic hinges occurred at 1100 kN. The plastic hinge initially formed at the crown, followed by hinges located at each shoulder. Post-test observations showed evidence of local buckling of the conduit wall, gaps between the plates at the seams, the tilting of bolts along the longitudinal seams, and surface cracks in the soil. Applying the material resistance factor of 0.9 to the ultimate load limit of 1100 kN measured for the structure yields a reserve capacity of 1.7 when compared to the fully factored load including dynamic load allowance and live load factors.
Thesis (Master, Civil Engineering) -- Queen's University, 2008-12-23 11:56:12.314
APA, Harvard, Vancouver, ISO, and other styles
6

Webb, Mark Cottington. "Improved design and construction of large-span culverts." 1999. https://scholarworks.umass.edu/dissertations/AAI9920666.

Full text
Abstract:
A comprehensive review was made of the design and construction of flexible metal and rigid reinforced concrete large-span culverts, past documented field experience of monitored culvert performance, and culvert failures. Full-scale field testing of a flexible metal and a reinforced concrete large-span culvert was conducted and the results compared with finite element computer analyses. Based on this work recommendations for improved design and construction of large-span culverts were developed. The review of metal culvert design and construction practice revealed numerous differences among current methods as well as deficiencies. Proposed design limit states were identified and discussed for improved practice. An improved earth load thrust prediction model was developed based on past analytical work considering the flexural rigidity of the structure relative to the surrounding soil, in addition to other factors. The design curves for arching factors were extended to cover a wider range of structural backfill width conditions and shallower burial. Also, a proposed construction procedure was outlined to control construction moments based on deflection limits as a function of the expected level of construction control. None of the existing methods explicitly deals with large-span reinforced concrete culvert design and construction practice. Therefore, a proposed design approach for these culverts was outlined. Construction practice was based on recommendations from the manufacturers. The review of failure cases showed that most failures of large-span metal culverts occurred as a result of poor backfill procedures and/or poor backfill material selection. Other causes were excessive construction loads and invert uplift. Excessive deformation was the most common limit state reached before or at failure. Furthermore, significant variations in structural response may occur over time after construction. Therefore, better construction provisions and control are needed, coupled with consideration of flexural stiffness and moment capacity in design. The field tests showed significant differences in structural behavior between backfilling and live load testing. The metal structure was successfully subjected to very heavy live loads at shallow cover conditions without the use of thrust beams or ribs (current practice). Finite element computer analyses of the two tests showed that earth load responses could be reasonably modeled; however, live load predictions were poor.
APA, Harvard, Vancouver, ISO, and other styles

Books on the topic "Large culvert"

1

J, McGrath T., National Research Council (U.S.). Transportation Research Board., American Association of State Highway and Transportation Officials., United States. Federal Highway Administration., and National Cooperative Highway Research Program., eds. Recommended specifications for large-span culverts. Washington, D.C: National Academy Press, 2002.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
2

Carrie of Culver Road. Ulverscroft Large Print, 1993.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
3

Papadopoulos, Panayiotis Charilaou. Long-term soil-structure interaction and design of large-span flexible culverts. 1987.

Find full text
APA, Harvard, Vancouver, ISO, and other styles

Book chapters on the topic "Large culvert"

1

Safavian, M. "Construction of diversion culverts on compressible foundations – Large Earthfill Dams." In Sustainable and Safe Dams Around the World, 918–26. CRC Press, 2019. http://dx.doi.org/10.1201/9780429319778-79.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

"Fish Habitat: Essential Fish Habitat and Rehabilitation." In Fish Habitat: Essential Fish Habitat and Rehabilitation, edited by Michele Dionne, Frederick T. Short, and David M. Burdick. American Fisheries Society, 1999. http://dx.doi.org/10.47886/9781888569124.ch29.

Full text
Abstract:
<em>Abstract</em> .—In the Gulf of Maine region, projects to restore or create salt-marsh habitat to replace saltmarsh functions and values reduced or lost to tidal restriction are increasing. We assess fish utilization of marsh restoration and creation projects along the central Gulf of Maine coastline by addressing three questions: (1) how do fish assemblages in manipulated and reference marshes compare, (2) how do differences between manipulated and reference marshes change over time, and (3) how do fishes respond to different types of restoration? Fish utilization of restored and created marshes in New Hampshire and Maine (two created and four tidally restored marshes) is compared to adjacent reference marshes. The comparison of manipulated marshes with local reference marshes provides an internal standard for the monitoring of each restoration project, making it possible (1) to follow changes over time while accounting for natural variation and (2) to make valid comparisons about the magnitude and direction of changes between independent restoration projects. Our study provides the first density estimates for fish utilization of vegetated salt-marsh habitat in the Gulf of Maine. The highest fish densities from this study just overlap with the lowest fish densities reported from more southerly marshes. Overall, fish were distributed similarly among manipulated and reference marshes, and fish distribution did not change with time. Trends in the data suggest that fish utilize elevated marshes restored by dug channels to a lesser degree than impounded marshes restored by culverts. It appears that fish will readily visit restored and created marshes in assemblages similar to those found in reference marshes over the short term (one to five years post-restoration) but are subject to the influence of differences in tidal regime, access to marsh habitat, and vegetation density. In the large majority of cases, hydrologic restoration of tidally restricted marshes will improve a much larger area of fish habitat per unit cost than creation of new marsh and will not be subject to many of the constraints that limit the function of created marshes. The primary consideration in tidal restoration projects is not necessarily the cost of construction but the social, economic, and political issues that must be addressed. Often, tidally restricted marshes are in highly developed coastal areas where many individual property owners may perceive the increased tidal flow as a threat, even when flood hazard studies show that no such threat exists. In spite of this caution, thousands of hectares of coastal fish habitat can be improved through a concerted program to restore the hydrology of tidally restricted marshes in the Gulf of Maine.
APA, Harvard, Vancouver, ISO, and other styles
3

"Fish Habitat: Essential Fish Habitat and Rehabilitation." In Fish Habitat: Essential Fish Habitat and Rehabilitation, edited by Michele Dionne, Frederick T. Short, and David M. Burdick. American Fisheries Society, 1999. http://dx.doi.org/10.47886/9781888569124.ch29.

Full text
Abstract:
<em>Abstract</em> .—In the Gulf of Maine region, projects to restore or create salt-marsh habitat to replace saltmarsh functions and values reduced or lost to tidal restriction are increasing. We assess fish utilization of marsh restoration and creation projects along the central Gulf of Maine coastline by addressing three questions: (1) how do fish assemblages in manipulated and reference marshes compare, (2) how do differences between manipulated and reference marshes change over time, and (3) how do fishes respond to different types of restoration? Fish utilization of restored and created marshes in New Hampshire and Maine (two created and four tidally restored marshes) is compared to adjacent reference marshes. The comparison of manipulated marshes with local reference marshes provides an internal standard for the monitoring of each restoration project, making it possible (1) to follow changes over time while accounting for natural variation and (2) to make valid comparisons about the magnitude and direction of changes between independent restoration projects. Our study provides the first density estimates for fish utilization of vegetated salt-marsh habitat in the Gulf of Maine. The highest fish densities from this study just overlap with the lowest fish densities reported from more southerly marshes. Overall, fish were distributed similarly among manipulated and reference marshes, and fish distribution did not change with time. Trends in the data suggest that fish utilize elevated marshes restored by dug channels to a lesser degree than impounded marshes restored by culverts. It appears that fish will readily visit restored and created marshes in assemblages similar to those found in reference marshes over the short term (one to five years post-restoration) but are subject to the influence of differences in tidal regime, access to marsh habitat, and vegetation density. In the large majority of cases, hydrologic restoration of tidally restricted marshes will improve a much larger area of fish habitat per unit cost than creation of new marsh and will not be subject to many of the constraints that limit the function of created marshes. The primary consideration in tidal restoration projects is not necessarily the cost of construction but the social, economic, and political issues that must be addressed. Often, tidally restricted marshes are in highly developed coastal areas where many individual property owners may perceive the increased tidal flow as a threat, even when flood hazard studies show that no such threat exists. In spite of this caution, thousands of hectares of coastal fish habitat can be improved through a concerted program to restore the hydrology of tidally restricted marshes in the Gulf of Maine.
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Large culvert"

1

Rigby, E. H., M. J. Boyd, S. Roso, P. Silveri, and A. Davis. "Causes and Effects of Culvert Blockage during Large Storms." In Ninth International Conference on Urban Drainage (9ICUD). Reston, VA: American Society of Civil Engineers, 2002. http://dx.doi.org/10.1061/40644(2002)298.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Devaud, Cecile B., and Elizabeth J. Weckman. "Numerical Simulation of a Pool Fire and Large Object in a Cross-Wind." In ASME 2004 Heat Transfer/Fluids Engineering Summer Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/ht-fed2004-56892.

Full text
Abstract:
The present investigation is focused on assessing the capabilities of Large Eddy Simulations (LES) using simplified sub-models for combustion and soot in a specific fire scenario. Fire development resulting from an aviation fuel spill close to a plane fuselage is considered. The computational domain and boundary conditions are defined according to the experimental configuration used in tests run by the Fire Research Group at the University of Waterloo. The present setup consists of a 2-m-diameter pool fueled with kerosene and located 1-m-upstream of a 2.7-m-diameter culvert in a large enclosure. A cross-wind with a velocity of 13 m/s is imposed on the fire and culvert. The calculations are time-dependent and three-dimensional. Sensitivity to the grid refinement, size of the enclosure and wind profiles is first investigated. Comparison between measured temperatures and numerical results across the computational domain is made. Velocity profiles are also examined. Reasonable agreement with the experiments is found. In the light of the present results, directions for future work are also discussed.
APA, Harvard, Vancouver, ISO, and other styles
3

White, David J., and Kenneth Hoevelkamp. "Settlement Monitoring of Large Box Culvert Supported by Rammed Aggregate Piers — A Case History." In GeoTrans 2004. Reston, VA: American Society of Civil Engineers, 2004. http://dx.doi.org/10.1061/40744(154)148.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Li, Jie, Yongzhen Luo, Yu Qi, Jiangbo Xu, Xin Han, Lijuan Han, and Fanghua Song. "Analysis of factors affecting stress and displacement of corrugated steel pipe culvert with large span and high depth." In International Conference on Smart Transportation and City Engineering, edited by Zhengliang Li, Xiaoyan Chen, Kaichen Yan, Fengjie Cen, Liyuan Peng, and Nan Lin. SPIE, 2021. http://dx.doi.org/10.1117/12.2613654.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Greiner, Miles, and Ahti Sou-Anttila. "Validation of the Isis-3D Computer Code for Simulating Large Pool Fires Under a Variety of Wind Conditions." In ASME 2003 Pressure Vessels and Piping Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/pvp2003-2146.

Full text
Abstract:
The Isis-3D computational fluid dynamics/radiation heat transfer code was developed to simulate heat transfer from large fires. It models liquid fuel evaporation, fuel vapor and oxygen transport, chemical reaction and heat release, soot and intermediate species formation/destruction, diffuse radiation within the fire, and view factor radiation from the fire edge to nearby objects and the surroundings. Reaction rate and soot radiation parameters in Isis-3D have been selected based on experimental data. One-dimensional transient conduction modules calculate the response of simple objects engulfed in and near the flames. In this work, Isis-3D calculations were performed to simulate the conditions of three experiments that measured the temperature response of a 4.66-m-diameter culvert pipe located at the leeward edge of 18.9-m and 9.45-m diameter pool fires in crosswinds with average speeds of 2.0, 4.6 and 9.5 m/s. The measured wind conditions were used to formulate time-dependent velocity boundary conditions for a rectangular Isis-3D domain with 16,500 nodes. Isis-3D accurately calculated characteristics of the time-dependent temperature distributions in all three experiments. Accelerated simulations were also performed in which the pipe specific heat was reduced compared to the measured value by a factor of four. This artificially increased the speed at which the pipe temperature rose and allowed the simulated fire duration to be reduced by a factor of four. A 700 sec fire with moderately unsteady wind conditions was accurately simulated in 10 hours on a 2.4 GHz LINUX workstation with 0.5 GB of RAM.
APA, Harvard, Vancouver, ISO, and other styles
6

Zheng, Yuan, Zong-Yin Zhao, Bo-Qin Fan, and Bo Qu. "Technique on Flow Measurement and Its Application in Low Head and Large Discharge Pump Stations." In ASME/JSME 2007 5th Joint Fluids Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/fedsm2007-37499.

Full text
Abstract:
The accurate discharge measurement of single pump in low head and large discharge pump stations has been considered as a difficult problem for a long time. Recently, with the completion of some pump stations of South-to-North Water Transfer Project in China, many low head and large discharge pump stations completed with gradually contracted inlet conduit need high accuracy of discharge measurement which is necessary to optimize the operation of pump units, sum up the total discharge and get the efficiency of the pump stations. In this literature, problems came across from traditional measurement methods of discharge are given. These methods are including five-hole probe discharge measurement, discharge measurement using current meter and differential pressure transmitter measurement. Among all these methods, the measurement principle, performance, installation and application of 7510P portable ultrasonic flow-meter with multi-path ultrasonic are specially introduced. Generally speaking, the low head pump stations usually have the characteristic of irregular multi-culvert construction with short straight conduit and gradually contracted cross-sections along the flow direction, so the accurate discharge measurement is very difficult to process. By installing multi paths in conduit, adopting technique on installation elevation of international regulations on Gauss integration method which is also employed in calculating flow, the flow can be got. The number of acoustic paths is determined by conduit construction and hydraulic conditions. The arrangements of acoustic paths are placed in the mode cross-link. Then the discharge can be calculated through integrating the obtained velocity in corresponding cross-section. The installation of 7510P portable ultrasonic flow-meter mainly comprises three processes, including the installation of transducers, the arrangement of cables and its connection with flow-meter. Combining the measured discharge in Jiangdu No.2 Pump Station of the South-to-North Water Transfer Project in China, following conclusions are presented: it has well stability, good repeatability of measurement results, high measurement accuracy with the error around ±0.30%, high reliability and the flow-meter fits a wide range of discharge well. The successful application of 7510P ultrasonic flow-meter accumulates useful experience for discharge measurement of single unit of low head and large discharge pump stations and add a new method of accurate field discharge measurement of low head pump stations, meanwhile, it will play a constructive role in the design, construction and management of pump stations.
APA, Harvard, Vancouver, ISO, and other styles
7

Serajiantehrani, Ramtin, Mohammad Najafi, Mohammadreza Malek Mohammadi, and Vinayak Kaushal. "Framework for Life-Cycle Cost Analysis of Trenchless Renewal Methods for Large Diameter Culverts." In Pipelines 2020. Reston, VA: American Society of Civil Engineers, 2020. http://dx.doi.org/10.1061/9780784483190.035.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Costa, Andrew. "Large Diameter Cured-in-Place Pipe Rehabilitation of Twin 90-Inch Culverts in Environmentally Sensitive Area." In Pipelines 2020. Reston, VA: American Society of Civil Engineers, 2020. http://dx.doi.org/10.1061/9780784483206.050.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Serajiantehrani, Ramtin, Mohammad Najafi, Vinayak Kaushal, and Mohammadreza Malek Mohammadi. "Environmental and Construction Cost Analysis of Trenchless High Density Polyethylene (HDPE) Sliplining Renewal Method in Large Diameter Culverts." In Pipelines 2022. Reston, VA: American Society of Civil Engineers, 2022. http://dx.doi.org/10.1061/9780784484296.023.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

de Boer, Ane, Max A. N. Hendriks, and Eva O. L. Lantsoght. "Improvements of a Nonlinear Analysis Guideline for the Re-examination of Existing Urban Concrete Structures." In IABSE Congress, New York, New York 2019: The Evolving Metropolis. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2019. http://dx.doi.org/10.2749/newyork.2019.0425.

Full text
Abstract:
<p>The Dutch Ministry of Infrastructure and the Environment is concerned with the safety of existing infrastructure and expected re-analysis of a large number of bridges and viaducts. Nonlinear finite element analysis can provide a tool to assess safety; a more realistic estimation of the existing safety can be obtained.</p><p>Dutch Guidelines, based on scientific research, general consensus among peers, and a long-term experience with nonlinear analysis, allow for a reduction of model and user factors and improve the robustness of nonlinear finite element analyses.</p><p>The 2017 version of the guidelines can be used for the finite element analysis of basic concrete structural elements like beams, girders and slabs, reinforced or prestressed. Existing structures, like box-girder structures, culverts and bridge decks with prestressed girders in composite structures can be analysed.</p><p>The guidelines have been developed with a two-fold purpose. First, to advice analysts on nonlinear finite element analysis of reinforced and pre-stressed concrete structures. Second, to explain the choices made and to educate analysts, related to the responsibility of limiting model uncertainty.</p><p>This paper contains an overview of the latest version of the guideline and its latest validation extensions. Most important impact is the extended operational lifetime of an existing reinforced concrete slab structure.</p>
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'Large culvert' for particular source types:
Journal articles
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography