Technology is available to exploit the potential energy formed by tides for the generation of electrical energy. The basic structure is a barrage or dam built across a river estuary or at the mouth of a bay. This dam is similar to that used in hydroelectric power plants built across flowing rivers. At regular intervals along the dam, gates and turbines are installed. When the tide is rising, the gates are opened. This allows water to flow into the area behind the barrage, raising the water level there. When the water has reached its highest level, the gates are closed. Then the tide drops on the seaward side, and this trapped water is several meters above the sea level. The gates are then opened, allowing the water to discharge out. The force of the flow turns the turbines and generates electricity. It is also possible to use tidal energy when the water flows in the other direction - through the gates into the estuary from the sea.
In this way, four periods of energy production are possible every day, since coastal regions experience two high and two low tides in just over 24 hours. In order for practical amounts of electricity to be generated, the difference between high and low tides must be at least five meters. Tidal power is renewable, non-polluting, and contributes no greenhouse gases to the atmosphere. This kind of system can provide a useful energy supplement to other sources in an era of diminishing fossil fuel reserves.
An argument that supports the use of tidal power to supply future energy needs has been undermined since it has several drawbacks that should be taken into consideration.
First, tidal energy can only provide small portion of total energy needs. This is because of the difficulty in finding good place to build required infrastructure in river area.
Second, the construction of tidal power plant in river estuary will affect the life of local organisms and habitants. For example, dams and gates will change the original condition of water in estuary area, which will bolster the growth of dangerous organism named red tide organism. This organism can cause paralysis in shellfish and other aquatic creatures living in nearby area. Fish migration between sea and river will be also obstructed because of the power plant infrastructure that block their migration path.
Third, fishing boats will not be able to navigate between estuary and open sea because of the dams and gates. This, in turn, will affect the jobs of local people.
Therefore, construction plan of tidal power plant in river estuary should reevaluate the potential drawbacks against the potential benefits for the environment and society.
| Post date | Users | Rates | Link to Content |
|---|---|---|---|
| 2017-07-09 | Aayushi | 73 | view |
| 2017-07-09 | akashdesai | 73 | view |
| 2016-12-27 | kantanandana | 73 | view |
| 2016-10-04 | nupur26796 | 60 | view |
- Compare and contrast the advantages of choosing a stable career over an adventurous lifestyle. Use reasons and specific examples to support your opinion. 71
- Compare and contrast your way of life with that of your parents Which way of life do you think would be more satisfying to future generations 66
- Compare and contrast your way of life with that of your parents. Which way of life do you think would be more satisfying to future generations? 76
- The widespread use of the Internet has given people access to information on a level never experienced before. How does this increase in the availability of information influence life in today's world? 70
- Do you agree or disagree with the following statements: students learn better when they are not threatened with possible failure. Use reasons and specific examples to support your opinion. 10
Grammar and spelling errors:
Line 3, column 519, Rule ID: WHITESPACE_RULE
Message: Possible typo: you repeated a whitespace
Suggestion:
...ucture that block their migration path. Third, fishing boats will not be able to...
^^^
Transition Words or Phrases used:
also, first, if, second, so, therefore, third, for example
Attributes: Values AverageValues Percentages(Values/AverageValues)% => Comments
Performance on Part of Speech:
To be verbs : 5.0 10.4613686534 48% => More to be verbs wanted.
Auxiliary verbs: 10.0 5.04856512141 198% => OK
Conjunction : 7.0 7.30242825607 96% => OK
Relative clauses : 4.0 12.0772626932 33% => OK
Pronoun: 7.0 22.412803532 31% => OK
Preposition: 27.0 30.3222958057 89% => OK
Nominalization: 9.0 5.01324503311 180% => OK
Performance on vocabulary words:
No of characters: 1022.0 1373.03311258 74% => OK
No of words: 193.0 270.72406181 71% => More content wanted.
Chars per words: 5.29533678756 5.08290768461 104% => OK
Fourth root words length: 3.72725689877 4.04702891845 92% => OK
Word Length SD: 2.59982838415 2.5805825403 101% => OK
Unique words: 113.0 145.348785872 78% => More unique words wanted.
Unique words percentage: 0.585492227979 0.540411800872 108% => OK
syllable_count: 315.9 419.366225166 75% => OK
avg_syllables_per_word: 1.6 1.55342163355 103% => OK
A sentence (or a clause, phrase) starts by:
Pronoun: 2.0 3.25607064018 61% => OK
Interrogative: 0.0 0.116997792494 0% => OK
Article: 2.0 8.23620309051 24% => OK
Subordination: 0.0 1.25165562914 0% => More adverbial clause wanted.
Conjunction: 0.0 1.51434878587 0% => OK
Preposition: 1.0 2.5761589404 39% => More preposition wanted as sentence beginning.
Performance on sentences:
How many sentences: 10.0 13.0662251656 77% => OK
Sentence length: 19.0 21.2450331126 89% => OK
Sentence length SD: 39.0257607229 49.2860985944 79% => OK
Chars per sentence: 102.2 110.228320801 93% => OK
Words per sentence: 19.3 21.698381199 89% => OK
Discourse Markers: 5.8 7.06452816374 82% => OK
Paragraphs: 5.0 4.09492273731 122% => OK
Language errors: 1.0 4.19205298013 24% => OK
Sentences with positive sentiment : 4.0 4.33554083885 92% => OK
Sentences with negative sentiment : 2.0 4.45695364238 45% => More negative sentences wanted.
Sentences with neutral sentiment: 4.0 4.27373068433 94% => OK
What are sentences with positive/Negative/neutral sentiment?
Coherence and Cohesion:
Essay topic to essay body coherence: 0.156740332235 0.272083759551 58% => OK
Sentence topic coherence: 0.0614475103081 0.0996497079465 62% => OK
Sentence topic coherence SD: 0.0311779615546 0.0662205650399 47% => Sentences are similar to each other.
Paragraph topic coherence: 0.0863646874265 0.162205337803 53% => OK
Paragraph topic coherence SD: 0.0247832211187 0.0443174109184 56% => OK
Essay readability:
automated_readability_index: 13.2 13.3589403974 99% => OK
flesch_reading_ease: 52.19 53.8541721854 97% => OK
smog_index: 3.1 5.55761589404 56% => Smog_index is low.
flesch_kincaid_grade: 10.7 11.0289183223 97% => OK
coleman_liau_index: 13.46 12.2367328918 110% => OK
dale_chall_readability_score: 8.59 8.42419426049 102% => OK
difficult_words: 49.0 63.6247240618 77% => More difficult words wanted.
linsear_write_formula: 11.0 10.7273730684 103% => OK
gunning_fog: 9.6 10.498013245 91% => OK
text_standard: 11.0 11.2008830022 98% => OK
What are above readability scores?
---------------------
Rates: 73.3333333333 out of 100
Scores by essay e-grader: 22.0 Out of 30
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Note: the e-grader does NOT examine the meaning of words and ideas. VIP users will receive further evaluations by advanced module of e-grader and human graders.