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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.
This article was published in the following journal.
Name: The Science of the total environment
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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)
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