Showing posts with label Volcano. Show all posts
Showing posts with label Volcano. Show all posts

Lahar Flood; disaster or blessing?

Cold lahar flood is a natural event caused by the vulcanic deposition results from the volcano eruption of saturated water at the time of heavy rain so that the flow of debris down the form to slope away to the low. If the flow along the river, there was no handling of the flood of lava (eg, sabo dam building) then the flow of cold lava can cause natural disasters, with a very high damage to the body of the river, building on the river bank and lowland areas in the river downstream. In fact, in many cases lava flood events can cause the victim a large amount of soul.


SAND MINING MANAGEMENT

Post-lahar flood can occur hoarding material vulcanic sand and rock along the river flow. Although at the beginning of the likely damage to his arrival but on the other hand the return of material is highly awaited by the people in the area around the river as a blessing. And activities of mining sand and stone can be done.

Mining activities, sand and stones in the vicinity of the river by the people around the river, is required for regulating the mining, so it does not cause problems such as unwanted struggling mining area, the problem of licensing and environmental issues.

The need for mining rules

Activities in the mining of sand and stone, direct interactions occur between the three (3) components of society that is the area around the mine, local governments and organizations engaged in sand mining business.

The three components above should cooperate each other to form the system that's mutually beneficial. Community to give authority to local governments to manage and create a procedure with the mining establish formal rules or regulations and the other local governments are obliged to provide protection.

Relations between local governments and community organizations is the local government to give permission to the organizations authorized to conduct mining with certain rules, while organizations are obliged to pay taxes and keep the environment by following the rule's conception of the environment.

Relationship between community organizations (company's) community with the mining company is to provide opportunities for people to be mine so that workers have the tariffs or fees must be paid to the company's mining community.

When the third relationship can be harmonious and run the rule's set the activities of sand and stone mining can mutually benefit all parties and also the environment.

The problems that arise around the mining of sand

Although in theory the relationship between the community, local government and mining companies can walk in harmony, but in practice in the field, it can become very complex and prone to problems.

Problems often arise, for example there's the wild do not have permission, breach of rules mining, less specifically provided sanctions for the offender, environmental and building storm flow of sediments due to the mining rules infringe, misuse of tax payments etc..

To overcome the above problems are not always easy because the condition is usually complex and there are conflicts of interest from the third component of the community. In the community are usually still less awareness of the preservation of the environment around the mine, including agricultural land and settlements so that their mining activities in the area of the property would culminate in damage to the environment because it does not limit the sand mining is a set standard so that mining companies violate the rules in the mining activities.

Next problem is still there's just wild that does not have a permit. And mining company that has a permit but mining activities violate the rules. For example, they do mining in the vicinity of the building foundation sabo dam so that the stable building. River canyon cutting and digging that violate the limit depth of water so that the lower face of the earth. In this case action is required or expressly sanctioned by the security apparatus, the people themselves and the local government as termination of mining activities and wild mining permit revocation.

The problem is most often ignored is the damage to the environment. If the rule's set is not implemented properly then the environment will be the victims. The building does not control the flow of sediments in accordance with its function, the basic degradation of the river experienced a decline in face of ground water, river cliffs prone to landslides that result in a reduction of agricultural land and settlement residents, the lack of land into the water, dead plants, animals and eventually starve the existence of ecosystems and the life of the region's threatened.

When environmental degradation is threatening the existence of life will arise, namely the impact of continued hunger and social conflict in which each component of the community will blame each other and not feel responsible.

So to avoid or at least minimize the danger of environmental damage that has already occurred in the area of sand mining needs to be done step by step persuasive and decisive penalty by law enforcement. And more important is to increase public awareness of the three components together to perform mining activities, sand and stone are the environment.
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River of my childhood


Sunday is the opportunity I have 1 week holiday and to visit my home. The village in the Wilis mount slopes with cool air, I felt like returning to my first little period, each day playing in the rice field terracing, playing kites continue to bathe in the river is clear with the black stones are large.

Wilis mount has a height of 2552 meters, and the peak is located on the border between the six districts in Kediri, Tulungagung, Nganjuk, Madiun, Ponorogo, and Trenggalek. Tourism Wilis Mount is the most waterfalls, but it has not been developed so far. (source from wikipedia)

After visiting my parents house was extended to see the river that is full of memories. I also remote, about 1 km from the house. When I was still small, a short distance away because we walked with friends. My motorcycle parking at the bridge then go down the river canyon.


But I am disappointed, because the feeling of beauty and clarity of the river have been lost. Water flow, which was always clear and is now clouded by dirty plastics. Previously we often sit on the stone in the river while the shrimp occasionally notice ran behind the stone. The stones size as big as a truck . Now the stones are full of moss and waste involved. It's sad to see the fact almost 20 years passed and everything changed. Not improved but even worsened.

Then I ride back to the bridge and the beautiful memories to try to forget it. After taking some photos I go to another place where I had through my childhood, to the rice field while enjoying the beautiful Wilis mount from afar.

Sitting over a motorcycle while feeling the wind blowing, it feels very peaceful and beautiful.

However there's a sense that in the past often appear in mind when bathing in the river, the stones of the car can be located in the river, where it came from? Now I have the answer.

There are two possible origin of the stones:

  1. They are the result of lahar flow eruption of Wilis Mount, which is consistent character lahar flows can flow up to tens of kilometers down the slope and the downstream river. That means that the Wilis mount somewhere years is how active the volcano never erupt.
  2. on the Wilis mount slopes had occurred a large-scale soil erosion and landslide material including stones large flow saturated by water due to rain and into the flow of debris.
Both the above possibilities can be received. In the first alternative, Wilis Mount are classified as sleep and evidence of magma activity is still seen as the source of hot water, hot gas discharge from the bottom of Ngebel Lake (in Wilis mountain slopes) at the time that killed the fish in it.
Because there is still magma activity then it is likely sometime Wilis mountain could erupt again if the magma activity increased. Conditions have occurred on Mount Pinatubo in the Philippines.

While the second alternative is true when certain landslides occurred in a very large scale so that material can flow up to nearly 30 km from Mount Wilis to my village, and below it.

But the documents and the data is not never know. What is there or not.

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Pyroclastic


Pyroclastic is lava material that came out of magma kitchen, formed a lava dome at the peak of the volcano and then collapse in form of stone and sand blocks and was followed by glowing dust vulcanic as heat cloud.
Based on the activities, Pyroclastic consists of 2 types, namely:

1. The flow of pyroclastic material from the slide down the slope lava dome. Material under the form of blocks of lava rock and large and small to form a cloud above the summer. Flow occurs because the high pressure gas. (a typical phenomenon Mount Merapi, Central Java, often called by the name wedus gembel).
2.Lava dome is directly released into the air due to volcano eruption. This activity is closed in the sky around the explosion and the falling material can cause tremendous damage to tens of miles to reach the distance. When the hot material falling to the sea in large numbers can lead to the occurrence of pairs of even tsunami waves.

#The picture taked from here
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Magma, lava and lahar

Magma is a material made in the earth's crust (plates tektonik) form of the fluorescent material in the mud temperature is very high (up to 1000 degrees Celsius). Occur as a result of friction / collision tektonik two plates, resulting in high temperatures and form the kitchen magma pushing upwards and can bring the volcano. Here is the image formation process and magma volcano.

Lava is magma that comes from the belly of the earth / volcano due to an increase in activity vulkanik in the volcano. Lava can be out of fluid flowing down the mountain slope to a place far away in the valley, magma can also come out and stayed around the top of the volcano and formed lava dome (dome) so that the volcano is more visible (eg on the mount Merapi in Central Java) .

Lahar is lava mixed with water (either rain or other waters such as lakes in the vicinity of the mountain) so it becomes saturated and forms a flow with high-speed glide down the slopes to distances of tens of kilometers. When the lava is still hot water mixed, or a new kitchen out of the magma post erupsi then the hot lava. Conversely when the lava has buried long in the mountain slopes after erupsi ago mixed water in the wet season it will produce the flow of cold lava. Second type lava above have the same risk of post-disaster on the mountain erupsi fire that caused many victims of the soul
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