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POLA SEBARAN TIPE AIR BERDASARKAN KANDUNGAN ION UTAMA PADA AIRTANAH DANGKAL DI INDRAMAYU, JAWA BARAT Anna Fadliah Rusydi; Sudaryanto Martosuparno; Rizka Maria
JURNAL RISET GEOLOGI DAN PERTAMBANGAN Vol 27, No 2 (2017)
Publisher : Indonesian Institute of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1250.63 KB) | DOI: 10.14203/risetgeotam2017.v27.488

Abstract

Topografi daerah Indramayu merupakan dataran rendah hingga pantai, yang secara geologi terbentuk akibat endapan sungai. Indramayu merupakan daerah sub-urban yang diprediksi akan berkembang menjadi wilayah urban seiring dengan perkembangan Ibu Kota Jakarta. Perkembangan wilayah akan berdampak pada peningkatan kebutuhan air bersih yang saat ini salah satu sumbernya berasal dari airtanah dangkal. Kondisi airtanah dangkal di lokasi ini merupakan hal yang menarik untuk dikaji karena datarannya terbentuk pada lingkungan laut, sehingga memungkinkan airtanah tercemar oleh airlaut yang terjebak di kala pembentukan daratan. nalisis kualitas airtanah dangkal telah dilakukan terhadap 33 conto yang diambil mulai dari Jatibarang hingga pantai utara Indramayu. Dari hasil analisis kimia air di laboratorium dilakukan pembahasan khusus untuk ion-ion utama yang dihubungkan dengan kondisi lingkungannya. Kandungan TDS, Cl-, dan Ca2+ menunjukkan klasifikasi airtanah di wilayah penelitian didominasi oleh tipe air tawar, agak payau, air agak asin. Klasifikasi tersebut secara geologi berada pada dataran endapan banjir dengan susunan batuan lempung pasiran, pasir lempungan, dan endapan.Indramayu is located at lowland and coastal zones, which had been geologically formed from river deposits. Indramayu is a sub-urban, which is predicted to develop into an urban area, along with the growth of Jakarta as the capital city. The regional development will cause an increasing demand for clean water, which one of the primary current sources is shallow groundwater. The shallow groundwater conditions in this location are an interesting subject to study, due to its terrain was formed from a marine environment. Therefore,  groundwater might be contaminated by seawater trapped in land formation. This paper deliberates on classification and seawater contamination of shallow groundwater. Groundwater quality analysis has been done for 33 samples taken from Jatibarang region to north coast of Indramayu. Moreover, we analyzed in detail and extensive on major ions in the samples associated with environmental conditions. The contents of TDS, Cl-, and Ca2+ were indicated that the groundwater is dominated by freshwater, slightly brackish, and somewhat saline. That classified groundwater is located in river deposition, which consists of sandy loam, loamy sand, and sediments.  
Hidrokimia Mata Air Karst untuk Irigasi Studi Kasus Desa Ligarmukti, Kabupaten Bogor Rizka Maria; Ananta Purwoarminta; Rachmat Fajar Lubis
Jurnal Irigasi Vol 13, No 1 (2018): Jurnal Irigasi
Publisher : Balai Teknik Irigasi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1464.316 KB) | DOI: 10.31028/ji.v13.i1.1-10

Abstract

Ligarmukti Village in Bogor Regency is a karst hilly area that is rich in springs so that it can supply water for domestic and agricultural purposes. The chemical properties of water derived from limestone have their own characteristics which probably have an impact on the quality of agricultural products. Thus, this study was conducted to analyze the hydrochemical properties of karst springs for irrigation. Research methods were secondary data inventory, hydrogeological observation, and laboratory analysis. Sodong is the largest spring with a discharge of 314.42 l/s in the rainy season and 154.38 l/s in the dry season. Rice field area is approximately 300 ha. The discharge from the spring can irrigate rice fields covering an area of 314.14 ha in the rainy season and 154.38 ha in the dry season. In addition to discharge, water chemical factors also determine agricultural yields. Groundwater hydrochemical including Ca-HCO3 facies, groundwater flow systems are controlled by autogenic recharge which shows the type of water in the spring from rainwater directly infiltrated in the area. Classification of water for irrigation including C2-S1 type which shows that spring has good water quality, a risk of medium salinity, and low sodium risk. The results of this study can be used by the government to maintain the village of Ligarmukti as an agricultural granary.