nchrp research report 915

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Relationships between Erodibility and Properties of Soils.

Publication Date	2019
Personal Author	Briaud, J. L.; Shafii, I.; Chen, H. C.; Medina-Cetina, Z.
Page Count	338
Abstract	NCHRP Research Report 915: Relationship Between Erodibility and Properties of Soils provides state transportation geotechnical engineers, hydraulic engineers, structural engineers, and other practitioners with a detailed analysis and a searchable Microsoft® Excel spreadsheet, NCHRP-Erosion, that uses statistical techniques to relate geotechnical properties to soil erodibility. Downloadable from the TRB summary web page for this report (search trb.org for “NCHRP Research Report 915”), NCHRP-Erosion is a searchable database that includes compiled erosion data from the literature review and a plethora of erosion tests. It contains equations that may be used to estimate the erosion resistance of soil and determine whether erosion tests are needed. Analysis of the erodibility of geomaterials is important for the study of problems related to soil erosion such as bridge scour, embankment overtopping erosion, and stream stability. Erodibility is a relationship between the soil erosion rate and fluid velocity or hydraulic shear stress. Since different soils have different geotechnical properties, their erosion rates vary. Additionally, existing laboratory and field erosion soil tests yield varied results that make it difficult to achieve consistent and reliable estimates. Under NCHRP Project 24-43, Texas A&M University (TAMU) was asked to develop equations that quantify soil erodibility on the basis of soil properties. Two approaches were used: (1) development of correlations between the elements of the erosion function (critical velocity, critical shear stress, and slope of the erosion function) with basic soil properties (e.g., plasticity index, mean grain size, unit weight, and shear strength) and (2) use of erosion categories to develop best fit models where the erosion function fits in a zone between boundaries to be directly associated with a single category of the erosion function so that correlations with soil properties can be developed. TAMU completed an extensive literature search compiling erosion data from multiple sources worldwide and conducted hundreds of erosion and geotechnical property tests. Following detailed statistical analysis, a searchable Microsoft Excel spreadsheet that relates geotechnical properties to soil erodibility was developed. This spreadsheet, NCHRPErosion, can be downloaded from the TRB summary web page for NCHRP Research Report 915. Through the use of numerical simulations, the researchers also compared soil erosion test methods to inform test method selection. NCHRP Research Report 915 should be helpful for those responsible for geotechnical analysis within state transportation agencies and other practitioners.
Keywords
Source Agency
NTIS Subject Category
Corporate Authors	Transportation Research Board, Washington, DC. National Cooperative Highway Research Program.
Document Type	Technical Report
NTIS Issue Number	202006

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NCHRP Research Report 948: Getting to the Other Side: Safe Navigation for Pedestrians and Bicyclists at Alternative and Other Intersections and Interchanges

This article includes highlights from a National Cooperative Highway Research Program (NCHRP) research report looking at the safety of pedestrians and bicyclists at alternative intersections and interchanges. The report provides design strategies for the four most common alternative designs: restricted crossing U-turn (RCUT), median U-turn, displaced left turn, and diverging diamond interchange. A quantitative analysis method was built around 20 performance-based design checks/flags highlighting design characteristics that impact safety and quality of service for people walking and biking, regardless of the intersection type. The 20 Design Flag method is applied to all pedestrian and bicyclist movements through an intersection, which are then tallied to the total of yellow and red flags identified. The percentages of flags allow for comparison of proposed designs and can be used in screening designs to move forward.

• Record URL: https://www.trb.org/main/blurbs/182697.aspx
• Find a library where document is available. Order URL: http://worldcat.org/issn/07386826
• Schroeder, Bastian
• Warchol, Shannon
• Alston, Mike
• Publication Date: 2022-1
• Media Type: Digital/other
• Features: Figures; Photos;
• Pagination: pp 3-7
• Issue Number: 337
• Publisher: Transportation Research Board
• ISSN: 0738-6826

Subject/Index Terms

• TRT Terms: Cyclists ; Highway design ; Interchanges and intersections ; Pedestrian safety ; Performance based specifications ; U turns
• Subject Areas: Design; Highways; Pedestrians and Bicyclists; Safety and Human Factors;

Filing Info

• Accession Number: 01838654
• Record Type: Publication
• Files: TRIS, TRB, ATRI
• Created Date: Mar 16 2022 10:19AM

• E-NEWSLETTER

'); } -->   Please assign a placeholder URL for NCHRP Research Report 915: Relationship Between Erodibility and Properties of Soils.   We need this so that an Excel spreadsheet that will accompany the report can direct readers to the Inquiry Operation Manual for the spreadsheet, which is included in the report.   Thanks,   Janet   Senior Editor Cooperative Research Programs Transportation Research Board National Academies of Sciences, Engineering, and Medicine 500 Fifth Street NW Washington, DC 20001 ; 202-334-2979     '); }

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Effective Low-Noise Rumble Strips

Rumble strips are proven safety countermeasures for roadway departure crashes. They produce vibration and noise to alert drivers that they are drifting from the travel lane. Neighboring residents—contiguous to roadways with rumble strips—often complain about the noise generated by these appurtenances. This has prompted a need to simultaneously study noise mitigation and rumble strip design and application.

NCHRP Research Report 1107: Effective Low-Noise Rumble Strips , from TRB's National Cooperative Highway Research Program, proposes a rumble strip design that would minimize exterior noise on the outside of the vehicle yet generate sufficient auditory and vibratory response on the inside of the vehicle to alert the operator of a roadway lane departure.

Supplemental to the report are Appendices A , B , C , D , and E and a presentation .

RESOURCES AT A GLANCE

• Appendix A: Review of Literature and Current Practices
• Appendix B: Test Program Development
• Appendix C: Midwest Sinusoidal Strips Testing
• ↓ Scroll Down for More Resources
• Transportation and Infrastructure — Design
• Transportation and Infrastructure — Pavements
• Transportation and Infrastructure — Safety and Human Factors

Suggested Citation

National Academies of Sciences, Engineering, and Medicine. 2024. Effective Low-Noise Rumble Strips . Washington, DC: The National Academies Press. https://doi.org/10.17226/27861. Import this citation to: Bibtex EndNote Reference Manager

Publication Info

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• Appendix D: Washington State Sinusoidal Strips Testing
• Appendix E: Rumble Strip Design Recommendation Development
• Presentation

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National Cooperative Highway Research Program (NCHRP) (1986) Methods for Identifying Hazardous Highway Elements. Program Report 128. https://onlinepubs.trb.org/Onlinepubs/nchrp/nchrp_syn_128.pdf

has been cited by the following article:

TITLE: A Novel Network Screening Methodology for Rural Low-Volume Roads

KEYWORDS: Network Screening , Low-Volume Roads , Rural Highways , Traffic Safety

JOURNAL NAME: Journal of Transportation Technologies , Vol.13 No.4 , September 8, 2023

ABSTRACT: Low-volume roads (LVRs) are an integral part of the rural transportation network providing access to remote rural areas and facilitating the movement of goods from farms to markets. These roads pose unique challenges for highway agencies including those related to safety management on the highway network. Specifically, traditional network screening methods using crash history can be effective in screening rural highways with higher traffic volumes and more frequent crashes. However, these traditional methods are often ineffective in screening LVR networks due to low traffic volumes and the sporadic nature of crash occurrence. Further, many of the LVRs are owned and operated by local agencies that may lack access to detailed crash, traffic and roadway data and the technical expertise within their staff. Therefore, there is a need for more efficient and practical network screening approaches to facilitate safety management programs on these roads. This study proposes one such approach which utilizes a heuristic scoring scheme in assessing the level of risk/safety for the purpose of network screening. The proposed scheme is developed based on the principles of US Highway Safety Manual (HSM) analysis procedures for rural highways and the fundamentals in safety science. The primary application of the proposed scheme is for ranking sites in network screening applications or for comparing multiple improvement alternatives at a specific site. The proposed approach does not require access to detailed databases, technical expertise, or exact information, making it an invaluable tool for small agencies and local governments (e.g. counties, townships, tribal governments, etc.).

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Limitations of the Infiltration Approach to Stormwater Management in the Highway Environment

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