'Projection of 17pc coastal inundation not factual'

[Homo Sapiens]

I take some harsh positions to try get the best answers to underlying questions .

I know that. On the topic,if you analyze the picture and misery of the affected people,it is quite evident that, a lot of these problems are associated with extreme poverty.Extremely poor people forced to live in place dangerously close to erosion prone river bank or newly formed vulnerable island as these places are without any personal ownership.They build sacks and mud hut there which easily wash away or blown away in flood or cyclone and they became helpless and attract sympathy of International photo-journalist.So a lot of remedy lies in cutting poverty and rapid development of the country.An economically strong Bangladesh can built necessary infrastructure in coastal areas and people can build good strong houses in better places,These places should be left for forestation or other activities for a long time.

 

[Gandh brandi]

I know that. On the topic,if you analyze the picture and misery of the affected people,it is quite evident that, a lot of these problems are associated with extreme poverty.Extremely poor people forced to live in place dangerously close to erosion prone river bank or newly formed vulnerable island as these places are without any personal ownership.They build sacks and mud hut there which easily wash away or blown away in flood or cyclone and they became helpless and attract sympathy of International photo-journalist.So a lot of remedy lies in cutting poverty and rapid development of the country.An economically strong Bangladesh can built necessary infrastructure in coastal areas and people can build good strong houses in better places,These places should be left for forestation or other activities for a long time.

Is there any way to reclaim land lost by river erosion? Like how they built artificial islands in south china sea and dubai's luxury islands. Preferably with silt instead sand. Then harden the bank with concrete. I feel like we lose more land via river erosion to padma and meghna than rising sea water. Plus erosion destroys the livelihood and land of the people living there forcing them to relocate here in dhaka. it's a vicious cycle.

 

[Nike]

Is there any way to reclaim land lost by river erosion? Like how they built artificial islands in south china sea and dubai's luxury islands. Preferably with silt instead sand. Then harden the bank with concrete. I feel like we lose more land via river erosion to padma and meghna than rising sea water. Plus erosion destroys the livelihood and land of the people living there forcing them to relocate here in dhaka. it's a vicious cycle.

here you can learn alot from Netherland on how to manage their lowland.... my country too learn from their

 

[Nilgiri]

YOu should rest assured BD will be underwater in your lifetime and bengalis will sail to Chennai to kick out Tamils to Ravan in Lanka.

Chola vs Pala rematch I doubt result will be any different given who had the navy even back then.

 

[Homo Sapiens]

Is there any way to reclaim land lost by river erosion? Like how they built artificial islands in south china sea and dubai's luxury islands. Preferably with silt instead sand. Then harden the bank with concrete. I feel like we lose more land via river erosion to padma and meghna than rising sea water. Plus erosion destroys the livelihood and land of the people living there forcing them to relocate here in dhaka. it's a vicious cycle.

No,we get more land as a form of 'Char' than lost away by river erosion due to extra 2 billion ton sediment carried by river from Himalayas.Expert estimated that we get average 20 sq. km extra due to 'char' formation.You can read this report.
http://www.thedailystar.net/frontpage/new-land-raises-new-hope-1206460

Bangladesh easily can increases it's land mass another 10,000 sq. km by cross-dam in Meghna estuary.We need just several billion dollar and may be technical assistance from countries like Netherlands.We already gained 1000 sq. km by this method.Read-
https://defence.pk/threads/banglade...are-km-land-from-sea-thru-reclamation.395444/

 

[bluesky]

You obviously have no idea about the soil mechanics of silt islands for habitation and farming.

I have some knowledge about soil mechanics, but little on the soil science. Since you know very well about soil, so, would you mind elaborate on the definitions of two subjects.

 

[Nilgiri]

I have some knowledge about soil mechanics, but little on the soil science. Since you know very well about soil, so, would you mind elaborate on the definitions of two subjects.

Many silt formations are notoriously bad for construction of permanent structures. Many lose their load bearing properties significantly when they come under moisture contact and retention...some can even flow or micro flow (Esp if surface is recently formed).

They generally cannot be the dominant proportion of the soil in most cases (if you want to make massive numbers of dense cheap housing structures etc).

The specific mechanics in these islands need to be tested....and investment made into any structures (more concrete foundation pouring/anchoring etc) but it will increase the cost per building basically. Depending on the silt, you can also add fly ash to improve its characteristics when wet along with various other pre-compression load methods. Problem with deep bore foundation is if its a silt island, this may be very deep given the whole island is basically a silt deposit.

It will all have to be investigated and tested, which costs time and money. You cannot just settle people in permanent structures there en masse:

http://user.engineering.uiowa.edu/~swan/courses/53139/notes/weak_compressible_soils.pdf

 

[bluesky]

The specific mechanics in these islands need to be tested....and investment made into any structures (more concrete foundation pouring/anchoring etc) but it will increase the cost per building basically.

Bd remote areas are not covered with high rise structures. New habitation in the islands need only light structures. So, silt carried from high lands in India will not cause any problem in the newly formed islands.

Even in the present day BD land area the soil bearing capacity is more or less 3t /m2. So, the high rise buildings need piling. The already constructed Jamuna bridge required 2.5 m & 3.15 m diameter piles that were driven about 80 m below the river bed.

The silt/soil in the river bed is so loose that it has almost no vertical load-bearing capacity and no horizontal shearing strength. So, piles were driven at an angle of 6:1. But, new islands need no pilings to support the bamboo structures.

 

[Nilgiri]

Bd remote areas are not covered with high rise structures. New habitation in the islands need only light structures. So, silt carried from high lands in India will not cause any problem in the newly formed islands.

Even in the present day BD land area the soil bearing capacity is more or less 3t /m2. So, the high rise buildings need piling. The already constructed Jamuna bridge required 2.5 m & 3.15 m diameter piles that were driven about 80 m below the river bed.

The silt/soil in the river bed is so loose that it has almost no vertical load-bearing capacity and no horizontal shearing strength. So, piles were driven at an angle of 6:1. But, new islands need no pilings to support the bamboo structures.

So you are saying everyone will just be housed in bamboo huts? OK I guess you could do that, but you plan on them staying this poor and willing to live this way in future? You have to plan the economy as you see it 20,30, 50 years from now etc. The way I see it, if they become more affluent, they also will want to live in the cities. Thats where the capacities have to be made rather than rural silt islands (where a few will stay back for farming etc....and could probably honestly live in houseboats). But BD is not so great in staying ahead of the capacity ratio curve....thats why I see a big problem for it during first half of this century. How long that will go on remains to be seen.

Thats why I put in my projection of solid houses for these folk. They will probably move over time to metropolis Dhaka and put pressure on the housing there....rather than be forced to live in bamboo huts in a newly formed island.

Thus BD urbanisation is really the key. But can it respond to the urbanisation adequately?

 

[bluesky]

So you are saying everyone will just be housed in bamboo huts? OK I guess you could do that, but you plan on them staying this poor and willing to live this way in future? You have to plan the economy as you see it 20,30, 50 years from now etc.

The way I see it, if they become more affluent, they also will want to live in the cities. Thats where the capacities have to be made rather than rural silt islands (where a few will stay back for farming etc....and could probably honestly live in houseboats). But BD is not so great in staying ahead of the capacity ratio curve....thats why I see a big problem for it during first half of this century. How long that will go on remains to be seen.

Only the peasant people are supposed to live there for the next few decades. They will use cheap and light materials for their houses. Rich will use piles when a building is four-storied or above. Anyway, the point of discussion here is BD land area is increasing continuously year after year. Thanks to India that it is unable to protect its high lands being eroded and carried down to expand our land. India will be paying this tax with soil
until the Sun blows itself up after 5 billion years.