Luweng in the Java language is called a sinkhole in the science of geology. Here's the face of the Guatemalan sinkhole that occurred on 23 february 2007 it.
Let's see, shocking and horrible of course right? Is this likely to occur in the soil beneath us?
Before you become frightened and panic, we'll see first, how the process of formation. The geology of course there are certain conditions or certain mechanisms and initiated specific signs in this sinkhole formation. One of the most frequent indication is the change in ground water systems (change geohydrology) before the occurrence of this subsidence.
Below I describe how this sinkhole formation or luweng.
Sinkhole or luweng this occurs in an area basically rock (bedrock) in the form of limestone.

1. At first there is a rift that formed the hole due to ingress of water. This area usually occurs in the area which is composed of limestone. Limestone is "relatively" easy terlarutkan than sandstone (rock terssun by sand, usually mineral quartz). Relatively easy terlarutkan do not try this at home dissolve the limestone yes, this dissolution process runs in the tens of thousands of years as well.
2. Because of the underground stream, it would appear hollow because the bottom was eroded by underground streams.
3-4-5-6 This process takes place continuously with the scraping and the fall-out from the rocks above it. Until the end of this perforation forming space large enough and the "bridge" at the top not hold and ...
BLUNG! This hole did not wholly satisfy the basic to the bottom, because the volume of rock that fills the above is not entirely lost. The depth of the hole could start just a few meters to as deep as 100 meters large as that in Guatemala it.
8. The deposition on the basin was finally shut down Luweng which is often not realized by the occupants thereon.

How to recognize the possibility of this phenomenon?
1.Pertama this occurs in an area basically rock (bedrock of his "is limestone.
2.Gejala before the subsidence of symptoms is often preceded by symptoms of changes in hydrological systems. The existence of a new lake immediately after the rain (water runoff), especially in areas of the basin.
3.Dijumpai soil cracks. For example, trees are slanted towards towards the same point (the center of subsidence), the door is closed difficult because mleyot-mleyot.

 The flooding in this example is the caused by a plugged a throat or outlet for the sinkhole. Often this is thought to be the cause of all sinkhole flooding, but is only one of four causes. Diagram by James C. Currens.
Valley sinkhole is experiencing flooding due to drainage system or natural drainage channel is closed.

Flooding from the base-level stream water puts pressure on the mouth of the spring, slowing outflows and Potentially reversing flow at the spring and into the sinkholes. Diagram by James C. Currens.
Another sinkhole valleys flooded at the time of runoff water. Symptoms symptoms of changes in groundwater geology is that often shows how the underground river system in the area berbatugamping. This rocky limestone area and the Gunung Sewu example Wonosari Wonogiri south, also in the vicinity of Goa in south Jatijajar Kebumen. Rivers flow underground in Wonosari one of them is on Bribin currently being carried out tests on drill to get the column of water to drive turbine power plants.

A rock fall has created a leaky dam, and reduced the flow capacity of the main conduit at the downgradient end of the groundwater basin. When precipitation is much Greater in the immediate watershed of an upgradient sinkhole, a sinkhole downgradient May be flooded Pls flow is reversed, although it received little precipitation. Diagram by James C. Currens.
Underground streams can be closed which indicates the possibility of underground ruins. hydrological patterns, of course, will be affected due to this underground ruins. So of course before doing the test drilling to find whether there are tunnels under, need also observed the surface. Is there a former sinkhole basin-basin. Are the observed changes in hydrology within a certain time when the rainy season and dry season. Pengeboranpun test can not necessarily prove or reject the hypothesis, because the search for this perforation can not be done easily, imagine if an area only 2 km square must be proven with a single drill hole .... difficult it really is like looking for needles in the hay. One way is by observation (survey) below the surface geophysics, both electrical resistivity surveys, electromagnetic, gravity, etc..
Title: Sinkhole
Posted by:Riszky Nurseno
Published :2011-05-24T05:44:00-07:00
Rating: 3.5
Reviewer: 5 Reviews

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