Analysis and Summary of Dynamic Gates

8/13/2019 Analysis and Summary of Dynamic Gates

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Analysis and Summary of Dynamic Gates


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Table of Contents

1.MOSE Project . 32. Inflatable Rubber Dam. 43.Three Gorges Dam54.Eastern Sheldt Barrier . 65.Panama Canal ..76.Maeslant Barrier ..8


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Mose Project

Strengths

Defends water level as high as 3 m (9.8 ft); activated at 1.1 m Stainless steel floodgates Requires the use of compressed air to activate (Archimedes principle of buoyancy) 30 min activation time Does not modify water exchange between the sea and the lagoon

Weaknesses

Project under way since 1989 with start of REA projecto Construction between 2003 to 2014 (12 years of labor)

Total cost of 4.272 Billion Used tremendous amount of energy (land, water, manpower) to create prototype of

environment to test the effectiveness of the floodgates

14 years of going through regulations and jurisdictions before given final go-ahead Structure is underwater, which makes maintenance very difficult

Opportunities

Opening of 1,200 jobs per year for construction, and 150 per year for maintaining Saving thousands of lives in Venice that could potentially be taken with a disastrous

flood

Can be similarly implemented in other regions of the world if land is surrounded bycanal system and deals with flooding

Threats The 7 largest high tides of the year (which have caused tremendous floods in Venice) Tides higher than 3 m (gates maximum capability), by means of hurricanes, tsunamis

or climate change


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Inflatable Rubber Dam

Strengths

Flexible fabric that exhibits good wear-resistance characteristics Diverts water for irrigation Can be used for flood control, temporarily raising existing dams, flood control,water

retention foraquifer recharge, reducing or preventingsalt water intrusion into fresh

water areas, protect low-lying coastal areas from tidal flooding, enabling fish passage

past diversion works (by deflation), and for sewage retention/separation during flood

events

Shorter construction periods (3-6 months) Lower cost of capital Long service life (30+ years) Can be installed in any channel cross-section shape

Weaknesses

Overflow on the air-filled rubber dams is restricted to 20% of its height (compared to50% with water-filled)

Dam heights are usually restricted to 5 m Vibrations might result from fluid-structure interactions during overflows greater than

20% over-topping, and the instabilities might damage or destroy the rubber

membrane

Opportunities

Installed in stream and river beds More than 2000 rubber dams in the world and increasing Can be filled with air, water or both
http://en.wikipedia.org/wiki/Flood_controlhttp://en.wikipedia.org/wiki/Aquifer_rechargehttp://en.wikipedia.org/wiki/Salt_water_intrusionhttp://en.wikipedia.org/wiki/Salt_water_intrusionhttp://en.wikipedia.org/wiki/Aquifer_rechargehttp://en.wikipedia.org/wiki/Flood_control


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Threats

Overflow characteristics have not been widely researched Can alter the ecosystem functionality and migration of upstream fish Can take up to 3 hours to inflate or deflate (depending on flow size )

Three Gorges Dam

Strength

Three gorges dam can protect the local area from flooding. Since the Yangtze River has atendency to flood frequently, measures have been taken in the past to lessen the impacts

on the area

Three gorges dam produces rich hydro energy. The development reserves of hydroenergy can reach up to 1021 thousand kilowatts providing enough clean and cheap

energy for the industries in the area.

The dam also creates rich tourism resources. The area has unique geological structurewhich attracts thousands of tourists to visit. The area integrates the natural and human

landscape smoothly.

Weakness

The cost to build the dam is so high. The government estimated that the Three GorgesDam project would cost 180 billion yuan (US$22.5 billion).

The dam leads to the inundation of fertile farming land. The 100,000 acres that willbe flooded accounts for 10% of the grain supply, 50% of which is rice.

People living in the area have to be relocated due to the raised water.


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Opportunity Analysis

The creation of the reservoir has a number of economic values. It will aid in boostingagriculture, since the reservoir will hold more water for irrigation. It also will provide the

surrounding areas with a stable source of drinking water.Trade is estimated to increase

five times in the Central China. Transportation costs are expected to reduce by 35-37%.

The transportation in the area is improved due to the dam. With a final depth of 525 ft,larger ships can be used to transport products up and down the Yangtze River.

The hydro energy provided by the dam can reduce the release of carbon dioxide. From2003 to 2007, power production equaled that of 84 million tonnes of standard coal,

reducing carbon dioxide by 190 million tonnes, sulfur dioxide by 2.29 million tonnes, and

nitrogen oxides by 980,000 tonnes.

Threat Analysis

The dam does not have a disaster prevention system. Three gorges dam can be in dangerdue to earthquakes in the area.

People in the area lost their jobs due to the relocation caused by the implement of ThreeGorges Dam.

Eastern Scheldt Storm Surge Barrier

Strength

The surge barrier protects people and infrastructure from the threat of flooding. Instead of building a conventional dam, the Dutch constructed the barrier with movable

gates.

The dam is manually operated but if human control fails an electronic security systemacts as a backup

Weakness


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The cost of operation can reach up to 17 million euros per year. The barrier limits the transportation in the local area.

Opportunity

As a result, an entirely new landscape emerged-lakes, dams, beaches, recreation areas,new settlements and industrial zones. Manipulating the currents generated sandbars and

nature reserves.

The barriers create economic opportunities in the local area.

Threat

The tides in the area changed dramatically and can be a threat to the mussel industry.

Panama CanalStrengths

A key pass way for international maritime trade.Panama Canal made it possible for shipsto travel between the Atlantic and Pacific Oceans in half the time previously required.

The water is moved by gravity, and is controlled by huge valves in the culverts Mechanical interlocks are built into the controls to make sure that no component can be

moved while another is in an incorrect state

No motor is required to fill up the gates and to drain them. The dam at one of the arteries to the canal, is able to generate the electricity to run all the

motors which operate the canal as well as the locomotives in charge of towing the ships

through the canal

Weaknesses

The Panama Canal unlike the Suez Canal is not operated at the sea level. Since, it issituated in a mountainous terrain; the sea level is 500 ft.

The dimensions of the gates determine the maximum size of ships which can use thecanal.


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Health risks posed to workers in the mosquito-infested Panamanian jungle, principallymalaria and yellow fever, cost thousands of lives and caused unanticipated delays

Threats

Excessive soil erosion and sedimentation caused by deforesting the zone could lead toserious silting problems.

China is looking into constructing a 220 km railway between Colombia's Pacific andCaribbean coasts

Maeslant Barrier

Salient Points

Protects Rotterdam and surrounding communities from Storm Water surge.

The gates then close automatically by a feedback system that makes the decision basedon water levels and weather forecasts, with no human assistance needed.

With rising sea levels, the Dutch Government expects the gates to be used more often. About one million people in South-Holland are protected from the sea. The whole project, including the dike reinforcements cost 635 million Euros. This was

150 million Euros less than the alternative plan, in which all dikes in the area would have

been reinforced and raised.

Dike reinforcement project would have taken an additional ten years of work. The whole system is above the water. Hence, making the maintenance easy.

Analysis and Summary of Dynamic Gates

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