What is tidal power? Environmental effects ?

-

What is tidal power?



Tidal power is a type of water power derived from ocean tides and can be traced back to tenth century britain, where tides were used to power coastal mills. Cannot be used in many areas because tides have to be within the minimum range of about 8m. To harness tidal power, a dam is built across the entrance to a bay or estuary, creating a reservoir. When there is sufficient water to run the turbines, the dam is opened, and water flow through it into the reservoir, turning the blades of the turbines and generating electricity

- ebb tide (tide falling), flood tide (tide rising) - the first and largest modern tidal power plant is the La Rance tidal power plants in north coast france
- Produces about 240,000 kW from 24 power units spread out across the dam


Environmental effects:


- change in the hydrology of a bay or estuary caused by the dam can adversely affect the vegetation and wildlife.

- dam restricts upstream and downstream passage of fish.

- the periodic rapid filling and emptying of the bay as the dam opens and closes with the tides changes habitats for birds and other organisms.

Comments

Post a Comment

Popular posts from this blog

Discuss the seven characteristics of useful information.

-
Discuss the seven characteristics of useful information. Answer: The seven characteristics of useful information are: relevant, reliable, complete, timely, understandable, verifiable and accessible. These characteristics are qualities that information should possess to be useful in a business environment. Briefly stated, in order for information to be useful it must be: 1) relevant, meaning that it reduces uncertainty and adds to the decision-making process; 2) reliable information is information that is free from error, and is accurate in its nature; 3) complete information is information that does not omit any important data, facts, or aspects about events or activities; 4) information is timely when it is fully available to enable the decision-making process to proceed; 5) understandable information must be both in an intelligible and useful format; 6) information is considered verifiable if two people, acting independently of each other, produce the same inform
Read more

Why have accounting software packages been designed with separate transaction modules?

-
Why have accounting software packages been designed with separate transaction modules? Answer: : Since every organization does not necessarily use all of the transaction cycles in its operations, it is to the advantage of the organization to be able to "pick and choose" from among various software modules that track and record different transaction cycles. For example, a law firm would have no need to implement a production cycle module. Also, the nature of a transaction cycle varies across the broad spectrum of business organizations. Again, a law firm would have a revenue cycle, but it would not involve the purchase, receipt, and payment for products or merchandise; likewise a retail store chain may not sell any consulting services to its customers.
Read more

A laboratory assistant prepared solution of 0.8 M, 0.6 M, 0.4 M, and 0.2 M sucrose, but forgot to label them. After realizing the error, the assistant randomly labeled the flasks containing these four unknown solutions as flask A, flask B, flask C, and flask D.

-
A laboratory assistant prepared solution of 0.8 M, 0.6 M, 0.4 M, and 0.2 M sucrose, but forgot to label them. After realizing the error, the assistant randomly labeled the flasks containing these four unknown solutions as flask A, flask B, flask C, and flask D. Design an experiment, based on the principles of diffusion and osmosis, that the assistant could use to determine which of the flasks contains each of the four unknown solutions. Include in your answer (a) a description of how you would set up and perform the experiment: (b) the results you would expect from your experiments: and (c) an explanation of those results based on the principles involved. (Be sure to clearly state the principles addressed in your discussion.)
Read more