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A point source is a single identifiable localized source of something. A point source has a negligible extent, distinguishing it from other source geometries. Sources are called point sources because, in mathematical modeling, these sources can usually be approximated as a mathematical point to simplify analysis.
A point source of pollution is a single identifiable source of air, water, thermal, noise or light pollution. A point source has negligible extent, distinguishing it from other pollution source geometrics (such as nonpoint source or area source). The sources are called point sources because in mathematical modeling, they can be approximated as ...
Nonpoint source, or non-point source, or NPS, is a source that does not come from a single point. Point source, contrasts with nonpoint source;
Permitted point sources can trade with other point sources or nonpoint sources. Trades can occur directly, or be brokered by third parties. However, when dealing with nonpoint source reductions, a level of uncertainty does exist. In order to address this, monitoring should be conducted. Modeling can also be used as a supplement to monitoring.
Although this is a point source, due to the distributional nature, long-range transport, and multiple sources of the pollution, it can be considered as nonpoint source in the depositional area. Atmospheric inputs that affect runoff quality may come from dry deposition between storm events and wet deposition during storm events.
A point source of light casts only a simple shadow, called an "umbra". For a non-point or "extended" source of light, the shadow is divided into the umbra, penumbra, and antumbra. The wider the light source, the more blurred the shadow becomes. If two penumbras overlap, the shadows appear to attract and merge. This is known as the shadow ...
There are important differences between point source pollution and NPS pollution. There are many more nonpoint sources than there are point sources, and nonpoint sources are less discrete, or distinct, than point sources. Furthermore, nonpoint source discharges are not always easily observed, and monitoring nonpoint pollution can be costly.
Interference pattern generated by a point source and plane waves incident at various angles. Consider a point source located at the origin which illuminates a photographic plate which is located at a distance normal to the z axis. The phase difference between the source and a point (x, y, z) is given approximately by [1]: 3.1