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STUDI HIDROGEOLOGI DAERAH INDRALAYANG, KABUPATEN GARUT, JAWA BARAT

Undergraduate Theses from JBPTITBPP / 2018-05-17 13:45:12
Oleh : DWI VINA FEBRIM (NIM : 12012087), S1 - Geological Engineering-FITB
Dibuat : 2016, dengan 7 file

Keyword : Formasi Bentang, Indralayang, geologi, hidrogeologi, akuifer



Daerah penelitian terletak di Indralayang, Kecamatan Caringin, Kabupaten Garut, Jawa Barat. Daerah ini tersusun atas Formasi Bentang yang diendapkan pada Kala Miosen Akhir. Daerah ini merupakan bagian dari pusat pertumbuhan Rancabuaya yang merupakan salah satu dari pusat pertumbuhan Jawa Barat bagian selatan. Informasi geologi dan hidrogeologi di daerah ini masih sedikit, padahal informasi ini penting untuk menunjang pertumbuhan

daerah tersebut. Tujuan penelitian ini adalah mengetahui kondisi geologi dan hidrogeologi detil daerah penelitian. Penelitian dilakukan dengan metode pekerjaan lapangan geologi dan hidrogeologi, serta analisis laboratorium. Penelitian lapangan mencakup pemetaan geologi, pengukuran parameter fisik air, survey geolistrik, dan pemetaan muka airtanah. Sementara itu, pekerjaan laboratorium mencakup analisis petrografi, analisis mikropaleontologi, analisis hidrokimia, dan isotop stabil. Berdasarkan pekerjaan tersebut, diketahui bahwa daerah penelitian dibagi menjadi tiga satuan tidak resmi yang terdiri dari Satuan Batupasir Tufan 1, Batupasir Tufan 2, serta Aluvium dan Endapan Pantai. Struktur daerah penelitian berupa kekar-kekar yang berarah utara-selatan dan timur laut-barat daya. Terdapat satu sistem akuifer di daerah penelitian, yaitu akuifer bebas. Akuifer bebas terdapat di satuan Batupasir Tufan 1 dan Batupasir Tufan 2 dengan porositas dapat mencapai 25%. Ketebalan akuifer lebih kurang 85 meter dengan hambatan jenis berkisar antara lebih kurang 3,94 Ωm sampai 27 Ωm. Daerah resapan berada di atas akuifer bebas tersebut karena air dapat bergerak secara langsung dari permukan ke

dalam akuifer. Daerah resapan mata air di daerah penelitian terletak pada ketinggian 704,61 mdpl hingga 742,5 mdpl yang berada pada zona Pegunungan Selatan, Jawa Barat. Arah aliran airtanah di daerah penelitian umumnya mengarah dari timur laut ke barat daya. Pola aliran airtanah tersebut mengikuti pola kontur topografi, yaitu dari elevasi tinggi ke elevasi rendah. Airtanah daerah penelitian memiliki karakteristik fasies natrium-bikarbonat dan termasuk pada zona atas (upper zone) dan memenuhi baku mutu air layak minum.


Deskripsi Alternatif :



The study area is located in Indralayang, Caringin District, Garut Regency, West Java. This area is composed by Bentang Formation deposited in Late Miocene. This area is part of Rancabuaya growth center, one of growth centers located in the southern West Java. The geological and hydrogeological information in this area is very limited, yet, the information is very important in supporting the growth in the area. The purpose of this study is to know detailed geologic and hydrogeologic conditions of the

study area. The study was conducted by field geological and hydrogeological works, and laboratory analysis. The works within the field works are geological mapping, measurement of physical parameter of water, geoelectric survey, and hydraulic head mapping. Meanwhile, the laboratory analyses include petrographical, paleontology analysis, hydrochemistry, and stabil isotope analysis.

Based on this work, it is known that the study area is divided into three unofficial units,i.e. Tuffaceous Sandstone 1, Tuffaceous Sandstone 2, and Alluvium and Beach sediments. The structure in the study area are joints trending north-south and northeast-southwest. There is one aquifer system in the study area, i.e. unconfined aquifer. It is interpreted to be composed of Tuffaceous Sandstone 1 and Tuffaceous Sandstone 2 with the porosity can reach 25%. The thickness of the aquifer is approximately 85 meters with resistivity ranging from 3.94
Ωm to 27 Ωm. Recharge area is located above the unconfined aquifer because water can move directly from the surface into the aquifer. Springs recharge area in the study area is located on the elevation of 704.61 meters above sea level to 742.5 meters above sea level located on the Southern Mountains Zone. The direction of groundwater flow in the research area is from northeast to southwest. The groundwater flow pattern follows the pattern of topographic contour, i.e. from higher elevation to a lower elevation. Groundwater study area has the characteristic of sodium-bicarbonate facies. The result of physical parameter measurement and hydrochemical analysis show that the groundwater in the study area can be used as drinking water source.



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