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Ambassador report

[Ambassador report] LAND SUBSIDENCE IN SEMARANG

by Amama Ira Amalia Priyono | 10-11-2020 12:20 Comments 5 Comments recommendations 0 recommendations




[REPORT]

LAND SUBSIDENCE IN SEMARANG

Reported by: Amama Ira Amalia Priyono

 

Around the coast is an area prone to abrasion and land subsidence. The abrasion itself is caused by waves eroding the land banks which are directly adjacent to the sea. The waves hit the land directly, causing the coastline to be increasingly eroded and filled with sea water. Then for land level decline it can be caused by several factors of oil and gas extraction, the further impact of abrasion which causes sea water to fill the land, the absence of a strong binder / root to tie the soil surface, and soil hoarding activities to raise the soil surface.

 

In Semarang, this problem has been around for a long time and has not yet been resolved. When it rains, it is certain that the city of Semarang near the sea coast will be submerged. In addition, this land subsidence also causes the area to experience flooding even when there is no rain. This is because the land is already lower than sea level. Based on observations in the settlement area around the coast, the ditch on the side of the road has a water level higher than the ground level and residents have made a fence around the trench so that water does not enter the residents' settlement. Because water is an object that can seep into the ground and flow out of the canal, every year in the area there are submerged houses that turn into swamps so that the community cannot live anymore. To overcome this, local people used to backfill land above the swamp to raise the surface of the land above sea water. This is wrong.

 

When the previously low land surface has become a swamp, the lower soil structure will become tough and easy to move. When the mobile land is filled with other soil, it is true that the upper part will dry up and new houses can be built. However, the bottom is prone to movement soon so that the surrounding containment will be more prone to submerging. The added land will increase the soil load above the water surface. Water can seep back into the soil and cause further soil subsidence.

 

To overcome this, there are several steps you can take:

1. Doing greening around the beach to prevent abrasion

2. Carrying out reforestation in the containment area around the coast as an effort to tie up mobile land.

3. Do not landfilling is possible because it will increase the load from the soil surface.

4. Provide a breakwater on the edge of the sea.

5. Increase understanding and awareness of the dangers of sustainable land subsidence.

 

One of the public burial places on the coast of Semarang is also a victim of this land subsidence disaster. Many of the bodies that were lost were carried by the ocean currents or were bodies that reappeared to the ground. The coastal area of ​​the city of Semarang sinks 10 cm every year. If this is not resolved immediately, it will change the coastline every year to be closer to the mainland and reduce the land area of ​​Semarang City

 



land subsidence

5 Comments

Amama Ira Amalia  Priyono

  • Amama Ira Amalia Priyono says :
    Hello WooJoo Mentor

    Greeting from Indonesia
    Thank you for comment on my report!

    I hope this problem will be resolved soon for the Semarang City and eastern coast of South Korea for the sake of a sustainable life time.
    This is like a problem in many coastal countries.
    Hopefully things will get better and no disaster will happen.
    Hope you are in good health too.

    Best Regards,
    Amama Ira Amalia Priyono
    Posted 16-11-2020 08:35

Mun WooJooMentor

  • Mun WooJooMentor says :
    Hello Amama,
    this is your mentor WooJoo.

    I hope you are doing well.
    Thank you for sharing your report about current concern in Semarang.
    Such natural phenomenon also has been observed in eastern coast of South Korea.
    The problem is that such dramatic change in land level covered with water can lead to safety accidents, flooding too.
    Years later, if the land subsidence and water level rise continues, it would cause a greater problem.
    Therefore, I hope a good solution comes up to solve the issue as soon as possible.

    Keep sharing

    Regards,
    WooJoo
    Posted 13-11-2020 20:35

Amama Ira Amalia  Priyono

  • Amama Ira Amalia Priyono says :
    Hello SJ Mentor

    Greeting from Indonesia
    Thank you for your comment on my report!

    It is true, that land subsidence in Semarang has had a huge impact on the ecosystem and the surrounding community.
    Besides the government is trying to overcome this problem, many communities and community groups are also trying to make this problem resolved immediately

    Best Regards,
    Amama Ira Amalia Priyono

    Posted 11-11-2020 00:09

SJ Mentor

  • SJ Mentor says :
    Hello Amama!
    It's your SJ mentor.

    Warm greetings from Korea!
    Thank you for introducing coastal erosion in Semarang.
    It is natural to be eroded due to waves.
    But some cases, as you mentioned, erosion is caused by various circumstances such as oil/gas extraction, exploit of groundwater, etc.
    As well as land subsidence, sea level rising could also affect flooding in Semarang.
    We should take steps that you presented to prevent sink of the land.
    Hope things are fine with you.

    Best regards,
    SJ mentor.
    Posted 10-11-2020 17:26

Amama Ira Amalia  Priyono

  • Amama Ira Amalia Priyono says :
    pict cr :https://images.bisnis-cdn.com/posts/2019/07/26/1129238/antarafoto-progres-tanggul-rob-pesisir-utara-pekalongan-030719-hpp-1-1.jpg
    Posted 10-11-2020 12:21

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