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    <title>Transport Research International Documentation (TRID)</title>
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    <copyright>Copyright © 2026. National Academy of Sciences. All rights reserved.</copyright>
    <docs>http://blogs.law.harvard.edu/tech/rss</docs>
    <managingEditor>tris-trb@nas.edu (Bill McLeod)</managingEditor>
    <webMaster>tris-trb@nas.edu (Bill McLeod)</webMaster>
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      <title>Transport Research International Documentation (TRID)</title>
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    <item>
      <title>Imaging Suspended Sediment Concentration in Ship Channels with Marine Electrical Resistivity</title>
      <link>https://trid.trb.org/View/2678210</link>
      <description><![CDATA[Electrical resistivity is a common near-surface geophysical measurement for geotechnical site investigations. Often, there is a need to run electrical resistivity surveys underwater, such as to inspect unknown bridge foundations or groundwater surface water interactions; however, these measurements are static where the electrodes are placed on the floor of the waterbody. It is also possible to gather marine electrical resistivity measurements, in which case a cable is towed on the surface of a waterbody, and data are continuously collected. Marine measurements are advantageous because large areas can be covered in a relatively short time; however, there is limited evidence of marine resistivity used for geotechnical investigations. In this study, we present a case history of using a towed marine electrical resistivity measurement to image sediment concentration in a deep-draft ship channel traversing a shallow bay system. The data were collected in the Houston Ship Channel (HSC) through a series of surveys before and after deep-draft vessel transits to monitor the change in electrical resistivity of the water affected by the amount of resuspended sediment. There was a relative 34.7% decrease in the water column resistivity at the channel floor between a survey following a vessel and a survey without a vessel; the change in resistivity between the surveys was significant. By contrast, there was only a 2.7% change in resistivity, which was not significant, when comparing two surveys that both followed a vessel. This research highlights the ability of marine electrical resistivity to collect mobile data of suspended sediment, which is applicable to many geotechnical problems such as increased sediment load generated from deep draft vessels or sediment movement following extreme events. Furthermore, if used by engineers or port authorities, such data collection methods can support an asset management plan for the amounts of sediments to be redistributed.]]></description>
      <pubDate>Tue, 21 Jul 2026 09:49:16 GMT</pubDate>
      <guid>https://trid.trb.org/View/2678210</guid>
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    <item>
      <title>Evaluation of NDOT's Construction Stormwater Detention Measures Using Full-Scale Testing Techniques</title>
      <link>https://trid.trb.org/View/2714464</link>
      <description><![CDATA[Sediment is a leading pollutant in waterbodies, contributing to turbidity, pollutant transport, ecological degradation, and reduced flow capacity. Construction activities are major sources of sediment-laden runoff, necessitating regulatory compliance through Stormwater Pollution Prevention Plans. This study developed a full-scale testing methodology simulating Nebraska hydrologic conditions to evaluate the performance of Nebraska Department of Transportation silt traps and sediment traps at the Auburn University Stormwater Research Facility. Results showed that standard installations can be significantly improved through design modifications. For silt traps, pairing with a modified V-shaped, wire-backed silt fence with a central weir achieved the highest sediment retention (95.9%), substantial total suspended solids (TSS) reduction (89.1%), and turbidity reduction (67.7%). A slash mulch berm also performed well but may be limited by material availability. Structural testing of the low porosity silt fence indicated that reduced post spacing and fence height improved durability. For sediment traps, the use of coir baffles and a surface skimmer enhanced flow control, reduced turbulence, lowered downstream TSS and turbidity, and retained sediment (91.1%). Overall, optimized configurations significantly improved sediment capture and downstream water quality, supporting refined design recommendations for effective sediment control practices.]]></description>
      <pubDate>Wed, 24 Jun 2026 17:03:20 GMT</pubDate>
      <guid>https://trid.trb.org/View/2714464</guid>
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    <item>
      <title>Evolution of research hotspots and future trend prediction of river and lake sediment solidification based on bibliometrics and machine learning</title>
      <link>https://trid.trb.org/View/2679633</link>
      <description><![CDATA[With the increasing frequency of river and lake dredging, large amounts of sediment are continuously produced, posing significant challenges in resource-efficient, low-carbon disposal. Solidification technology, known for its economic viability, adaptability, and environmental friendliness, has become a key research direction for sediment treatment. Based on publications from the Web of Science, this study combines bibliometric analysis and machine learning trend prediction to explore the development trajectory, research hotspots, and future trends in sediment solidification. Publication volume has steadily increased since 2000, with a notable surge in the past five years. Academic influence has shifted from a few core works to a diversified and mature research system. International collaboration and interdisciplinary integration are growing, with China taking a central role in both publication output and academic influence. Research has evolved from focusing on pollutant migration and environmental safety to addressing mechanical properties and engineering applicability, and more recently, expanding to high-performance solidification materials, micro-mechanism analysis, and intelligent methods. Machine learning models, such as ridge regression and Huber regression, are effective in long-term trend modeling, while ensemble methods capture abrupt changes in trends. Predictions suggest that future research will focus on micro-mechanism analysis, low-carbon material adaptability, multi-pollutant co-solidification, and intelligent formulation optimization. This study provides data-driven insights and methodological guidance for future scientific planning and engineering applications.]]></description>
      <pubDate>Wed, 17 Jun 2026 12:23:21 GMT</pubDate>
      <guid>https://trid.trb.org/View/2679633</guid>
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    <item>
      <title>Vessel Wake–Induced Suspension of Bed Sediment in a Shallow Bay System</title>
      <link>https://trid.trb.org/View/2677544</link>
      <description><![CDATA[Wakes generated by deep-draft vessels are known to cause various environmental concerns, including erosion, increased sediment suspension, sedimentation, and ecological disturbances. This study employed field measurements in the Upper Galveston Bay, Texas (GBT) to record water-level fluctuations, 3D water velocities, and suspended sediment concentrations (SSCs) at a fixed location during wakes caused by deep-draft vessels transiting the Houston Ship Channel (HSC). The typical depths of the GBT and the HSC are 3 and 15 m, respectively, with over 20,000 deep-draft vessel movements per year. Using two SSC measurements at different elevations above the bed, a simple composite model was developed to estimate the vertical distribution of SSC during different phases of vessel wake influence. Correlations of vessel and wake parameters to SSC and sediment transport revealed that maximum secondary wave height and the combined drawdown-secondary height were the best predictors of SSC and total gross sediment flux out of all tested parameters. In contrast, the drawdown height was more effective at predicting total net sediment flux, as the unidirectional flow of the drawdown was the dominant contributor to overall sediment movement. The dominant transport direction was opposite the wake propagation direction, toward the HSC, with a high-level estimate of total sediment transported to the HSC of 8.05 × 108 kg/year, which is approximately 39% of typical shoaling rates for the area.]]></description>
      <pubDate>Wed, 17 Jun 2026 12:23:21 GMT</pubDate>
      <guid>https://trid.trb.org/View/2677544</guid>
    </item>
    <item>
      <title>The Effect of In-Stream Construction Activities on Turbidity, Suspended Sediment, and Sediment Loads</title>
      <link>https://trid.trb.org/View/2703847</link>
      <description><![CDATA[Transportation construction activities involving in-stream work can mobilize sediment and elevate turbidity, which can affect sensitive aquatic species such as freshwater mussels. Although cofferdams are used to isolate construction areas and limit sediment mobilization, their installation and removal create some degree of sediment release as a result of unavoidable streambed disruptions. To support more informed impact assessments and survey requirements for aquatic species protection, this study determined the transport distances of sediment associated with the installation and removal of cofferdams. Related objectives were to compare the effect of cofferdam-related construction events on sediment loads and to document the factors that affect recovery times and sediment loads. Streams associated with two bridge replacement projects in Virginia involving different but commonly used cofferdam types (sheet pile and sandbag or Jersey barrier) were instrumented with 19 turbidity sensors positioned upstream and up to 2,600 feet downstream of construction. In addition to continuous turbidity monitoring, data collection included water sampling and field measurements used to determine suspended sediment concentration and site-specific rating curve development. Suspended sediment loads were calculated using stream discharge, suspended sediment concentration, and duration of cofferdam-related construction events. Across both sites, peak turbidity increases occurred immediately downstream of the cofferdam, with values as high as 238 Formazin Nephelometric Units at Site 1 and 3,324 Formazin Nephelometric Units at Site 2, which returned to background levels within 50 to 100 feet downstream. Sediment loads attributable to construction ranged from 3 to 636 pounds, and for most cofferdam-related construction events, more than 75% of the sediment load occurred in the first 50 feet downstream. The use of sandbag or Jersey barrier cofferdams generated higher turbidity and sediment loads than sheet piles, largely because installation and removal required more streambed disturbance. For all cofferdam-related construction events, turbidity levels returned to background levels between 5 and 90 minutes. Sediment load calculations from evaluated precipitation events were one to three orders of magnitude higher than loads from cofferdam-related construction events. The findings can help inform assessments of potential mussel impacts from in-stream projects involving cofferdams conducted under comparable conditions. It is recommended that the Virginia Department of Transportation’s Environmental Division share this report with the Virginia Field Office of the U.S. Fish and Wildlife Service and aquatic program staff of the Virginia Department of Wildlife Resources to support agency evaluation of area-of-impact determinations and associated survey requirements for projects comparable with those this study examines.]]></description>
      <pubDate>Sat, 23 May 2026 18:35:18 GMT</pubDate>
      <guid>https://trid.trb.org/View/2703847</guid>
    </item>
    <item>
      <title>Investigation of the Dumping Dredged Material in the Offshore of Dung Quat Seaport, Vietnam</title>
      <link>https://trid.trb.org/View/2606214</link>
      <description><![CDATA[To maintain navigational channels, ports routinely undertake dredging operations, resulting in significant volumes of sediment that must be properly disposed of offshore. This study evaluates the environmental impact of offshore dumping of dredged material near Dung Quat Seaport, Vietnam. A coupled numerical model integrating hydrodynamics (MIKE 21 HD), wave (MIKE 21 SW), and sediment transport (MIKE 21 MT) modules was applied to simulate the dispersion of dredged materials over a 90-day disposal period involving a total volume of 540,000 m³. The model was calibrated and validated using field data, and Total Suspended Solids (TSS) concentrations were analyzed at various monitoring and coastal points. Results indicated that TSS levels remained below Vietnam's regulatory threshold of 0.05 kg/m³, suggesting negligible impact on the surrounding marine and coastal environments. This study provides a scientific basis for environmentally sound dredged material management and disposal planning in Vietnam's coastal waters.]]></description>
      <pubDate>Mon, 27 Apr 2026 16:35:15 GMT</pubDate>
      <guid>https://trid.trb.org/View/2606214</guid>
    </item>
    <item>
      <title>Characterization Of Sediment Loads and Size Distribution in Nebraska Roadway Runoff</title>
      <link>https://trid.trb.org/View/2686245</link>
      <description><![CDATA[The Nebraska Department of Transportation (NDOT) must manage sediment, and pollutant loads from roadway runoff to meet stormwater regulations. The SAFL Baffle, a hydrodynamic separator used by NDOT, depends on reliable estimates of total suspended solids (TSS) and particle size distribution (PSD). However, limited data exists for Nebraska roadways. In this study stormwater runoff was monitored at four NDOT-maintained sites, two in Lincoln and two in Beatrice, over 1.5 years to characterize TSS and PSD and to evaluate SAFL Baffle performance using the SHSAM model. Results showed large variability across sites and seasons. Median TSS ranged from 158 to 580 mg/L, and median particle size (d50) from 16 to 322 μm. Finer particles dominated at most sites, likely due to runoff from gravel or exposed soils off the roadway and especially outside of the NDOT right of way. Higher TSS in spring was observed and reflected low vegetation cover and winter sediment buildup. SHSAM modeling showed that the SAFL Baffle alone may not achieve 80 percent TSS removal, as it is less effective for fine particles. However, if off-site sediment loads are credited toward compliance, performance goals could be met. The study highlights the need for local sediment data and for accounting for off-site sources in NDOT stormwater design.]]></description>
      <pubDate>Thu, 09 Apr 2026 11:37:55 GMT</pubDate>
      <guid>https://trid.trb.org/View/2686245</guid>
    </item>
    <item>
      <title>Field Data on Propeller Wash Induced Dynamics in the Houston Ship Channel [supporting dataset]</title>
      <link>https://trid.trb.org/View/2683253</link>
      <description><![CDATA[These data have been collected as part of a Coastal REsearch And Transportation Education (CREATE) Tier 1 University Transportation Center project funded by the U.S. Department of Transportation. The project title is "Quantifying Vessel Propeller Wash Impacts on Sedimentation in Shallow-Bay Ports and Waterways". Data include derived products from vessel-mounted Acoustic Doppler Current Meter (ADCP) transects across the Houston Ship Channel (HSC) after large vessel passages to determine hydrodynamics and sediment suspension produced by these vessels. In addition, resistivity probe measurements are presented.]]></description>
      <pubDate>Mon, 30 Mar 2026 08:55:11 GMT</pubDate>
      <guid>https://trid.trb.org/View/2683253</guid>
    </item>
    <item>
      <title>Quantifying Vessel Propeller Wash Impacts on Sedimentation in Shallow-Bay Ports and Waterways</title>
      <link>https://trid.trb.org/View/2683254</link>
      <description><![CDATA[Shallow-bay ports and waterways in bay systems along the Gulf Coast of America are critical transportation infrastructure and the Nation’s economic drivers. Vessel propeller wash is the water movement induced by the forces generated from propeller rotation as vessels transit shipping channels. It has the potential to suspend sediment that can then be transported throughout the system, leading to potential sedimentation issues. In this study, field measurements using a vessel-mounted Acoustic Doppler Current Profiler (ADCP) and echo sounder system were conducted in the Houston Ship Channel (HSC) in Galveston Bay, Texas, by traversing the HSC back and forth with a survey vessel immediately after passage of a large ship. The obtained high-resolution 3D velocity and acoustic amplitude return values were processed to quantify suspended sediment concentration (SSC) and suspended sediment flux throughout the water column for around 80 different vessels transiting the HSC. Results indicate that vessel-induced SSC in the ship channel and along the slopes can reach values around 1 g/L, two orders of magnitude larger than background concentrations. Furthermore, suspended sediment fluxes close to 200 g/s perpendicular to the channel axis have been estimated from the field measurements. Simultaneous electrical resistivity measurements via an instrumented tow cable were used to test another measuring technique to assess suspended sediment concentration in the water column caused by large vessels. Although the signals were too small to image the SSC, the average electrical resistivity within the HSC was significantly different when vessels were and were not present in the same locations. Similarly, the electrical resistivity was not significantly different when two transects with vessels were compared or two transects without. Thus, the electrical resistivity data provide further evidence that the vessels induce SSC in the ship channel. The quantifications of SSC and flux and statistical significance of electrical resistivity differences highlight the importance of propeller wash contributions to persistent shoaling issues in the HSC and provide an opportunity to further develop prediction tools for sediment movement and management guidelines on how to mitigate siltation in our Nation’s waterways.]]></description>
      <pubDate>Mon, 30 Mar 2026 08:55:10 GMT</pubDate>
      <guid>https://trid.trb.org/View/2683254</guid>
    </item>
    <item>
      <title>Particle size distribution of total suspended sediments in urban stormwater runoff: Effect of land uses, precipitation conditions, and seasonal variations</title>
      <link>https://trid.trb.org/View/2576142</link>
      <description><![CDATA[Understanding particle size distribution (PSD) of total suspended sediments in urban runoff is essential for pollutant fate and designing effective stormwater treatment measures. However, the PSDs from different land uses under different weather conditions have yet to be sufficiently studied. This research conducted a six-year water sampling program in 15 study sites to analyze the PSD of total suspended sediments in runoff. The results revealed that the median particle size decreased in the order: paved residential, commercial, gravel lane residential, mixed land use, industrial, and roads. Fine particles less than 125 μm are the dominant particles (over 75%) of total suspended sediments in runoff in Calgary, Alberta, Canada. Roads have the largest percentage of particles finer than 32 μm (49%). Gravel lane residential areas have finer particle sizes than paved residential areas. The results of PSD were compared with previous literature to provide more comprehensive information about PSD from different land uses. The impact of rainfall event types can vary depending on land use types. A long antecedent dry period tends to result in the accumulation of fine particles on urban surfaces. High rainfall intensity and long duration can wash off more coarse particles. The PSD in spring exhibits the finest particles, while fall has the largest percentage of coarse particles. Snowmelt particles are finer for the same land use than that during rainfall events because the rainfall-runoff flows are usually larger than the snowmelt flows.]]></description>
      <pubDate>Thu, 31 Jul 2025 13:57:35 GMT</pubDate>
      <guid>https://trid.trb.org/View/2576142</guid>
    </item>
    <item>
      <title>Impact of Bridge Construction on Suspended Sediment Concentrations in Walnut Creek, Texas</title>
      <link>https://trid.trb.org/View/2553935</link>
      <description><![CDATA[This study examines the impact of a bridge construction project on suspended sediment concentration in Walnut Creek, Mansfield, Texas. A monitoring program was conducted during the project, using both continuous and discrete samples collected upstream, downstream, and at the construction site. Water samples were collected from the creek manually, using automated samplers to collect data during various flow and rainfall conditions. Data from four nearby stations were used to calculate rainfall at the bridge location, employing the inverse distance squared (IDS) precipitation model. The flow records from the USGS station, located 4.3 km downstream of the construction site, were adjusted to account for the difference in watershed area between the construction site and the station. Total suspended solids (TSS) and turbidity were measured, and the results indicated that construction activities influenced the sediment transport and deposition pattern in the creek, particularly during storms. Several recorded rainfall events, ranging from 10 to 94 mm/day, increased downstream TSS by 7%–38%. However, on March 16, 2024, following 23 mm of rainfall over a 5-h period, TSS levels at the bridge site and downstream increased significantly compared to upstream levels, rising by up to five times at the construction site. This spike in sediment concentration was largely attributed to runoff from the construction area. The study highlights that bridge construction can have a measurable impact on sediment levels downstream of the construction site, especially during storm events.]]></description>
      <pubDate>Wed, 11 Jun 2025 10:53:17 GMT</pubDate>
      <guid>https://trid.trb.org/View/2553935</guid>
    </item>
    <item>
      <title>Evaluating Sedimentation Impacts to Freshwater Mussels</title>
      <link>https://trid.trb.org/View/2452642</link>
      <description><![CDATA[Transportation system construction activities can cause increased suspended and redeposited solids in adjacent water systems, which may adversely impact freshwater mussels. The objectives of this study are to evaluate the impacts of suspended solids on juvenile mussels including to establish the impact thresholds, to assess the effects of sediment deposition on adult and subadult mussels, to develop a particle tracking model to understand the particle transport behavior, and to evaluate the available mussel impact mitigation practices. The research methodology includes a literature review, a survey and interview on the current sediment management practice for mussel species protection in the nation, laboratory studies, modelling development, interviews with Missouri Department of Transportation (MoDOT) personnel, and engineering assessments. Results of the DOT surveys emphasize the need for further research to enhance understanding of the impacts of sedimentation on freshwater mussels. Laboratory experiment results suggest that (a) particles at low concentrations may benefit juveniles’ growth, while higher TSS concentrations (> 1000 mg/L) inhibited their growth; (b) adult mussels’ response to deposition were affected by burial depth, vertical water supply and flow direction, as well as mussel species, with the endangered Pink Mucket being the most vulnerable among all species tested. A one-dimensional model was developed to illustrate the spatial distribution of sediment transport, and results suggest that sedimentation varies with particle size, flow velocity and depth. A strategy for both streamside and instream best management practices was developed. The strategy incorporates lessons learned from other state DOTs and provides a link between both the mussel experiments and the modeling exercises and project site engineering.]]></description>
      <pubDate>Wed, 27 Nov 2024 13:43:40 GMT</pubDate>
      <guid>https://trid.trb.org/View/2452642</guid>
    </item>
    <item>
      <title>Sustainable urban planning using green logistics and effective garbage disposal</title>
      <link>https://trid.trb.org/View/2387231</link>
      <description><![CDATA[Green logistics relates the social, economic, and environmental aspects that form a significant part of the sustainable development model. Considering the aforementioned aspects, the present study examines the use of electric commercial vehicles as part of the 'green' transportation framework that can be utilised for day-to-day garbage disposal in urban areas. The linear programming model approach with a genetic algorithm is used to optimise the routing using MATLAB. This paper applies vehicle routing for garbage disposal through electric vehicles to achieve much greater ecological and financial sustainable development. The model is demonstrated by a real-time case study in a city in Andhra Pradesh, India, to address vehicle routing and waste disposal logistics. The results indicate the benefits of this approach in sustainable planning in terms of placement of charging depots with respect to the traffic, cost-effective routing and the maximum traffic concentration.]]></description>
      <pubDate>Thu, 22 Aug 2024 15:11:13 GMT</pubDate>
      <guid>https://trid.trb.org/View/2387231</guid>
    </item>
    <item>
      <title>Investigation of ship-induced hydrodynamics and sediment resuspension in a restricted waterway</title>
      <link>https://trid.trb.org/View/2304590</link>
      <description><![CDATA[The movement of the ship-generated waves on restricted shallow waterways creates complex river dynamics. The irregular bathymetry increases the bed shear stress in the waterway, causing significant sediment resuspension. In order to investigate the impact of the ship-generated waves on the sediment resuspension, field measurements were performed at the Falta stretch of the Hooghly river, India (National Waterway 1). The present study applied the acoustic backscattering intensity of a horizontally-looking ADCP to quantify the sediment resuspension generated by ship waves. Based on the low-pass filter, the primary and secondary waves were separated. Based on the analysis, the low-frequency primary waves are less significant compared to the high-frequency secondary waves. The correlation study suggested that the ship-induced sediment resuspension is highly influenced by irregular bathymetry, river geometry, depth Froude number and ship speed. Finally, two new empirical models were proposed to estimate the sediment resuspension due to ship-generated waves by using correlation study and regression analysis.]]></description>
      <pubDate>Fri, 22 Dec 2023 16:52:46 GMT</pubDate>
      <guid>https://trid.trb.org/View/2304590</guid>
    </item>
    <item>
      <title>Tracking and monitoring of suspended sediment diffusion generated during the trenching of submarine pipeline in Northern Beibu Gulf</title>
      <link>https://trid.trb.org/View/2291327</link>
      <description><![CDATA[To figure out the law of diffusion of suspended sediment in water, researchers have tracked and monitored the diffusion of suspended sediment during thetrenching of submarine pipeline in Beibu Gulf based on the actual analytical results on ocean currents adjacent to the project area. Research findings indicate that during the procedures of tracking and monitoring, the average velocity of ocean current amounted to 19 cm/s, 30 cm/s and 22 cm/s, respectively, whereas the average direction of ocean current amounted to 228°, 226°and 231° respectively. In addition, the average content of suspended sediment of seawater in the surface layer, middle layer and bottom layer amounted to 1.8mg/L and 3.7 mg/L, 5.9 mg/L, respectively. In the ascending order, the relationship of the content of suspended sediment was: surface layer seawater < middle layer seawater < bottom layer seawater.]]></description>
      <pubDate>Mon, 20 Nov 2023 17:10:37 GMT</pubDate>
      <guid>https://trid.trb.org/View/2291327</guid>
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