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ITS » Master Theses » S2 - Teknik Geomatika
Posted by aprill@is.its.ac.id at 30/09/2015 17:54:35  •  1045 Views


STUDI PENURUNAN TANAH LAND SUBSIDENCE DENGAN PENGUKURAN GLOBAL POSITION SYSTEM GPS DAN VLF-EM DI DAERAH LUMPUR SIDOARJO

STUDYING LAND SUBSIDENCE USING GPS AND VLF-EM METHODS IN LUSI MUD VOLCANO

Author :
ROCHMAN, JUAN PANDU GYA NUR ( 3512 201 005 )




ABSTRAK

Semburan lumpur yang terjadi sejak 29 Mei 2006 sudah sampai umur 8 tahun sampai sekarang 2014 di daerah Porong Sidoarjo masih menunjukkan semburan dan dinamika yang menarik. Fenomena yang dikenal dengan nama LUSI mud volcano tersebut telah menutupi area seluas lebih dari 6.5 km dan telah menelantarkan lebih dari 30.000 orang. Fenomena semburan lumpur yang terus terjadi ini mengakibatkan ketidakstabilan sistem di dearah tersebut mengingat efek dari muatan lumpur runtuhnya over burden karena penghilangan permukaan tanah akibat semburan pembuatan tanggul terjadi retakan pada dinding rumah jalan rel kereta api bengkok memungkinkan besar terjadi ground diplacement dan land subsidence. Dalam thesis ini dilakukan pengukuran land subsidence dengan metode GPS. Pada prinsipnya pemanfaatan metode GPS adalah pada perubahan posisi dari titik pantau yang ada pada suatu kawasan tersebut. Pemantauan dilakukan dengan melakukukan pengukuran posisi titik pantau menggunakan GPS tipe geodetik pada waktu kala yang berbeda. Perbedaan posisi titik pantau yang sama pada waktu pengukuran yang berbeda menunjukkan adanya pergerakan tanah. Untuk itu dalam thesis ini dilakukan pengukuran GPS selang waktu untuk mengetahui perkembangan land subsidence di daerah sekitar Porong Sidoarjo. Selain pengukuran GPS dilakukan pengukuran VLF-EM untuk mengetahui struktur bawah permukaan tanah. Dengan informasi dari data VLF-EM ini dapat diketahui perkembangan struktrur bawah permukaan daerah porong dan korelasinya terhadap pergerakan tanah di daerah sekitar lumpur lapindo. Dari 19 titik pengukuran GPS daerah Lusi mud volcano mengalami subsidence penurunan dan uplift pengangkatan. Pengukuran GPS pada bulan April-Maret 2014 didapatkan nilai perubahan tinggi antara -0.952 m BT01 sampai 0.367 m DG11. Tingkat perubahan tinggi di daerah Porong pada bulan April - Maret didapatkan -0-.028 mbulan sampai 0.010 mbulan dengan penurunan tinggi mengarah ke Barat Daya . Sedangkan perubahan tinggi pada bulan Mei-April 2014 antara -0.996 m DGIJK sampai 0.255 m DG09. Tingkat perubahan tinggi di daerah Porong pada bulan April didapatkan -0-.026 mbulan sampai 0.059 mbulan dengan penurunan tinggi mengarah ke barat. Hasil pengukuran 7 lintasan VLF-EM didapatkan nilai resitivitas 2D bawah permukaan tanah yang bervariasi. Nilai resitivitas 30Om menunjukkan daerah yang tergenang air dari buble sedangkan nilai resitivitas 30Om merupakan daerah rekahan dan patahan.


ABSTRACT

Mud volcano that occurred in Porong Sidoarjo since May 29 2006 until now 2014 has reached the age of 8 years old which has been showing bursts and interesting dynamics. The phenomenon known as LUSI mud volcano has covered more than 6.5 km area and has displaced more than 30000 people. Mudflow phenomenon that still occurred until now results instability systems such as cracks in the walls of houses roads crooked railroads that allow ground displacement and land subsidence. In this thesis proposed land subsidence measurement with GPS method. In principle the use of the GPS method is on the changing position from monitoring position that existed in the area. Monitoring is done by measuring the position of monitoring points using GPS geodetic at a different time. Different position of the same monitoring point at different measuring times indicates there is the movement of the ground. Because of that in this thesis was carried out the GPS measurement to determine the development of land subsidence in the area around Porong Sidoarjo. Besides GPS measurement VLF-EM measurement is carried out to determine the subsurface structure. With the information from the VLF-EM data can be known subsurface structure development in Porong area and its correlation to the movement of the ground in the area around the lapindo mud. From GPS measurements in April-March 2014 obtained a change of high level subsidence and uplift between -0.952 m to 0.367 m. High level change in the area of Porong in April-March 2014 obtained -0.028 mmonth up to 0.010 mmonth with a decreasing high towards to the north. While high level change in May-April 2014 is between -0.996 m to 0.255 m. high level change in the Porong area in April 2014 obtained -0.026 mmonth up to 0.059 mmonth with a decreasing high towards to soouthwest. The results of 5 lines of VLF-EM obtained the value of 2D resistivity of subsurface that is varying. Resistivity values 30 Om shows flooded area of the bubble while resistivity value 30 Om is a fractures and faults area.



KeywordsLumpur Sidoarjo; Land subsidence; Pengukuran GPS; VLF-EM
 
Subject:  Subsidences gerakan bumi
Contributor
  1. Dr. Ing. Teguh Hariyanto, M.Sc
  2. Dr.A.Syaeful Bahri, S.Si, MT
Date Create: 30/09/2015
Type: Text
Format: pdf
Language: Indonesian
Identifier: ITS-Master-35103150001495
Collection ID: 35103150001495
Call Number: RTG 551.307 Roc s


Source
Master Theses of Geomatics Engineering, RTG 551.307 Roc s, 2015

Coverage
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Rights
Copyright @2015 by ITS Library. This publication is protected by copyright and per obtained from the ITS Library prior to any prohibited reproduction, storage in a re transmission in any form or by any means, electronic, mechanical, photocopying, reco For information regarding permission(s), write to ITS Library




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  1.  ITS-Master-39074-3512201005-abstract_id.pdf - 500 KB
  2.  ITS-Master-39074-3512201005-abstract_en.pdf - 499 KB
  3.  ITS-Master-39074-3512201005-conclusion.pdf - 1577 KB




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