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ITS » Master Theses » FISIKA S2
Posted by anis at 10/06/2009 15:58:58  •  6696 Views


INTERPRETASI POLA SEBARAN SALINITAS AIR TANAH DENGAN METODE GEOLISTRIK DI MUD VOLCANO PORONG SIDOARJO

THE INTERPRETATION OF GROUNDWATER SALINITY DISSEMINATION PATTERN BY USING GEOELECTRICAL METHOD IN MUD VOLCANO PORONG SIDOARJO

Author :
Setyowacono, Nurkolis Bambang 




ABSTRAK

Daerah di sekitar mud volcano Porong Sidoarjo pada saat ini telah mengalami deformasi berupa penurunan permukaan tanah. Hal ini menyebabkan terjadi perubahan tinggi muka air tanah selain itu dengan adanya mud volcano ini mengakibatkan terjadinya perbedaan kadar salinitas pada daerah ini. Metode yang digunakan dalam riset ini adalah geolistrik konfigurasi Schlumberger untuk memperoleh penampang distribusi vertikal tahanan jenis resistivitas yang memberikan informasi tentang salinitas yang terdapat dalam struktur bawah permukaan. Sebagai pembanding terhadap data resistivitas dilakukan pengukuran salinitas di beberapa titik yang selanjutnya dianalisis di laboratorium. Selain itu digunakan data sekunder sumur bor data geologi dan data hidrologi. Hasil penelitian yang dilakukan menunjukkan bahwa pola sebaran salinitas tinggi di sebelah Timur pusat semburan lumpur tepatnya di sekitar desa Renokenongo mencapai 2160 mgl dengan nilai resistivitas 0855 m dan menurun ke arah Timur sampai desa Permisan mencapai 380 mgl dengan nilai resitivity 153 m. Sebaran salinitas di Barat pusat semburan yaitu di desa Siring Timur mencapai 1660 mgl dengan nilai resistivitas 605 m dan semakin menurun ke arah Barat mencapai 76 mgl dengan nilai resistivitas 168 di desa Candipari. Secara umum pola sebaran salinitas semakin menurun ke arah Barat daya dari pusat semburan. Sedangkan untuk pola sebaran kedalaman air tanahnya semakin mendekati pusat semburan muka air tanah makin dangkal dan arah aliran air tanah kearah Tenggara dari pusat semburan lumpur.


ABSTRACT

Territories around the mud volcano Porong Sidoarjo is deforming in accompliance of ground surface downgrading. This changed the height of groundwater surface and affected the level of groundwater salinity. Method used in this research is Schlumbergers geoelectric configurations. This approach is used to get vertical distribution of resistivity values which gives informations about underground salinity. As a comparison to resistivity data salinity measuring is done in different spots to be analyzed in laboratorium. Secondary data used in this research is drilling wells geological and hydrological data. The result of this research showed that groundwater salinity dissemination is high on the East side of mud volcano center Renokenongo village which is up to 2160 mgl with resistivity point of 0855 m and it goes low to the East Permisan village which is up to 380 mgl with resistivity point of 153 m. Salinity dissemination on the West side of mud volcano center Siring Timur village reached 1660 mgl with resistivity point of 605 m and goes low to the South West of mud volcano center. Dissemination pattern of groundwater depth is approaching the mud volcano center groundwater surface is getting shallower and groundwater flow to the South East of mud volcano center



KeywordsGeolistrik konfigurasi Schlumberger ; resistivitas ; salinitas ; air tanah ; mud volcano.
 
Subject:  Geofisika
Contributor
  1. Dr. Widya Utama, DEA.
Date Create: 10/06/2009
Type: Text
Format: pdf.
Language: Indonesian
Identifier: ITS-Master-3100008033896
Collection ID: 3100008033896
Call Number: RTFi 550 Set i


Source
Master Theses, MAGISTER PROGRAMME DEPARTMENT OF PHYSICS RTFi 550 Set i, 2008

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