Topics

A study of the road sediment build-up process over a long dry period in a megacity of China.

08:00 EDT 6th August 2019 | BioPortfolio

Summary of "A study of the road sediment build-up process over a long dry period in a megacity of China."

The build-up of urban road deposited sediments is the key to study the quality of stormwater and the associated receiving waterbody in urban catchments. In the past, many sediment build-up field studies were conducted between 7 and 20days. It is generally assumed that the cumulative amount of pollutants reaches equilibrium and be represented as a mono-growth curve such as the power function. However, the dry period between two rain events in many areas in Northern China may be much longer than 20days, especially for spring and fall seasons. This research was conducted for 41days during a long dry period in 2017 in Tianjin, a megacity of China. The variability of the road sediment build-up process and the intrinsic and extrinsic factors which influence the process variability were investigated. It has been found that the normally used mono-growth curve (such as the power function) may be suitable for the short-term build-up process in area with less interference (sparse human activity area, R>0.6). The double-bell shaped curve (sin function) fits better for the 41-day study, a longer period build-up study (R>0.9). An "unexpected" phenomenon at which the particulate load was rapidly decreased in the first three sampling days was observed. This remarkable phenomenon can undoubtedly be well represented by the sin function instead of the power function. Compared to the power function, the goodness of fit of the sin function is increased by 30%-130%. Particle size, as an important characteristic affecting the behavior of particles, was considered in the build-up model. This research may bring people's attention to study the long-term road sediment build-up process and their impacts on the receiving water quality.

Affiliation

Journal Details

This article was published in the following journal.

Name: The Science of the total environment
ISSN: 1879-1026
Pages: 133788

Links

DeepDyve research library

PubMed Articles [30347 Associated PubMed Articles listed on BioPortfolio]

Treatment of polluted river sediment by electrochemical oxidation: Changes of hydrophilicity and acute cytotoxicity of dissolved organic matter.

River sediment is the main internal pollution source of water body. This study evaluated the feasibility of electrochemical oxidation (EO) for polluted river sediment treatment. The hydrophilic and ac...

Road deposited sediment: implications for the performance of filter drains servicing strategic trunk roads.

This study investigates the contribution of road deposited sediment (RDS) to clogging and the operational lifecycle of highway filter drains (HFDs). RDS samples were collected from nine Scottish trunk...

Microplastic pollution in a stormwater floating treatment wetland: Detection of tyre particles in sediment.

Synthetic rubber particles released from car tyres are expected to be an important type of microplastics in the environment, with road runoff and stormwater likely to transport tyre particles to the a...

The influence of rainfall intensity and duration on sediment pathways and subsequent clogging in permeable pavements.

The trapping of sediments within permeable pavements during infiltration is an important process that contributes to their water quality treatment performance. However, this process also leads to clog...

The road to recovery for vulnerable road users hospitalised for orthopaedic injury following an on-road crash.

Pedestrians, cyclists and motorcyclists are vulnerable to serious injury due to limited external protective devices. Understanding the level of recovery, and differences between these road user groups...

Clinical Trials [10834 Associated Clinical Trials listed on BioPortfolio]

Alcohol and Other Psychoactive Substances in Road Traffic - a Case-control Study

The main purpose of the study is to determine the accident risk when driving under the influence of psychoactive substances, including alcohol (DUI). Other aims are to find out the prevale...

Reduce Speed Limits From 90km/h to 80 km/h on French Roads: Impact on Mortality

On the first July 2018, the French government lowered the maximum authorized speeds on two-way roads without a central separator from 90 km/h to 80 km/h. The network concerned represents a...

Enhancing Outcomes After Colon Surgery

Most patients find that recovering from surgery is difficult particularly after abdominal surgery for cancer or other intestinal disorders. The surgical stress, healing process and concer...

Trial of Oxaliplatin, Cytosine Arabinoside, Dexamethasone With Rituxan (ROAD) in Patients With Relapsed Non-Hodgkins Lymphoma

The goals of this protocol are to determine the effect of oxaliplatin, cytosine arabinoside, and dexamethasone with Rituxan (ROAD) as treatment for patients with relapsed CD20+ B-cell non-...

Improving Mood in Assisted Living Settings

Late-life depression levels are escalating, and include 24% of all tenants of Assisted Living (AL) settings. A promising, novel intervention is a computerized visual speed of processing t...

Medical and Biotech [MESH] Definitions

Motorized, recreational vehicles used on non-public roads. They include all-terrain vehicles, dirt-bikes, minibikes, motorbikes, trailbikes, and snowmobiles. Excludes MOTORCYCLES, which are considered public road vehicles.

Work that is a report of a pre-planned, usually controlled, clinical study of the safety and efficacy of diagnostic, therapeutic, or prophylactic drugs, devices, or techniques after phase II trials. A large enough group of patients is studied and closely monitored by physicians for adverse response to long-term exposure, over a period of about three years in either the United States or a foreign country.

Process of using a rotating machine to generate centrifugal force to separate substances of different densities, remove moisture, or simulate gravitational effects. It employs a large motor-driven apparatus with a long arm, at the end of which human and animal subjects, biological specimens, or equipment can be revolved and rotated at various speeds to study gravitational effects. (From Websters, 10th ed; McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)

A computer simulation developed to study the motion of molecules over a period of time.

Devices which are very resistant to wear and may be used over a long period of time. They include items such as wheelchairs, hospital beds, artificial limbs, etc.

Quick Search


DeepDyve research library

Searches Linking to this Article