Реферат: Light Effects Measurement On Sedimentary Particles In

Water Essay, Research Paper

The purpose of this study plan is to measure the effects of light on sedimentary

particles in water. This study plan will include information pertaining to

equipment, procedures, and analysis. This plan will also discuss problems that

could arise during the sampling. Objectives The objective of this study is to

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observe whether sedimentary accumulation at various depths will effect the

penetration of light energy. One reason for monitoring light penetration is to

determine if sufficient energy is available for photosynthesis. This energy is

effected by the amount of sedimentation that is suspended in the water. In order

to ensure the data’s scientific validity this study needs to include the main

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principles. These include selecting a control; a control will be the measurement

that all other data is compared to. Second, the selection of the sample sites

must be non-bias and random. This ensures that the experiments are not

predictable or foreseeable. Finally the experiments must be described in great

detail so that they can be replicated at a later date. Literature Energy is

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distributed throughout the world?s oceans in several usable forms. The heat

transmitted during absorption is responsible for ocean waves, temperature and

currents. Light penetration in water will measure in units of quanta. This

measurement refers to the amount of sunlight that penetrates the water at

various depths. The light energy is absorbed and scattered by suspended

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particles, dissolved substances, and the water itself (USGS). Other factors

include attenuation coefficient: rate at which light decreases with depth. This

means that each site studied may have a different attenuation coefficient. An

example of a high coefficient would indicate a rapid decrease in light

penetration, therefore, high sedimentation. Another factor to be aware of is the

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color of the water. Color can effect the light penetration and intensity. Also

the turbidity which is a measure of water clarity and how much material is

suspended in the water. Suspended material could include soil particles, algae,

plankton, microbes, and other substances (EPA). The sources of the turbidity

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