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Heru Hendrayana
Departemen Teknik Geologi, Fakultas Teknik, Universitas Gadjah Mada Yogyakarta
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River water quality variability in the young volcanic areas in Java, Indonesia Heru Hendrayana; Indra Agus Riyanto; Azmin Nuha
Journal of Degraded and Mining Lands Management Vol 10, No 3 (2023)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2023.103.4467

Abstract

Rivers on Java Island are one of the water supply sources to meet the surrounding population's water needs. However, only large, high-priority rivers underwent a comprehensive water quality assessment. Rivers that aren't a priority are rarely examined, such as sub-watersheds in Kuntulan, Rejoso. Upper Serayu, Gajahwong, and Glondong. The surrounding community utilizes these five watersheds for irrigation, industry, and domestic. Hence, analyzing the water quality index in the five watersheds during the dry season is necessary. The method used in this research is a comparison of the water quality results between the standards of the Indonesian government and WHO, as well as a comparison of the Water Quality Index (WQI) and Pollution Index (PIj). The method often used in Indonesia is PIj, while WQI is more global and hardly used. The difference in the two ways is expected to provide variations in the water quality index. The water quality parameters were pH, TDS, TSS, COD, PO43-, NO3-, Total Coliform, Temperature, and EC. Comparing water quality with water quality standards in the five watersheds shows that several samples exceed the standard. WQI result shows that all river water in the five watersheds belongs to the excellent classification. A different result from the PIj index shows that the five watersheds were dominantly moderately polluted, with several samples considered polluted and extremely polluted. Differences in the index formula and water quality standards cause these different results. The results of the analysis show that the PIj index is more representative than the WQI as the PIj index shows the suitability of the classification comparison of water quality values with water quality standards compared to WQI.
STUDI KONEKTIVITAS AKUIFER ANTARA SUMUR BOR DENGAN SUMBER DAYA AIR DI BAWAHNYA (Study on Aquifer Connectivity, between Boreholes with water resources underneath) Agus Budhie Wijatna; Sudarmadji Sudarmadji; Sunarno Sunarno; Heru Hendrayana
Jurnal Manusia dan Lingkungan Vol 20, No 3 (2013): November
Publisher : Pusat Studi Lingkungan Hidup Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jml.18500

Abstract

ABSTRAKUntuk memenuhi kebutuhan air bersih bagi penduduk di daerah bekas bencana letusan Gunung Merapi, Kabupaten Sleman, DIY, telah dibuat 5 sumur bor di Dusun Srunen (BH1), Pagerjurang (BH2), Ngepring (BH3), Kuweron (BH4), dan di Dusun Bubur (BH5). Pembuatan sumur bor pada elevasi antara 544 sampai 846 m.dpl, dengan kedalaman antara 98-146 m dan debit pengambilan airtanah rerata 9-10 liter per detik tersebut dikawatirkan akan mempengaruhi kondisi muka airtanah sumur gali di Dusun Pendowoharjo (W7), Ngaglik (W8), Gebang (W9), Condong Catur (W10), sumur UGM (W11) dan mempengaruhi debit umbul (mataair) Ngepas (S8), Umbul Jogopaten (S9), Umbul Pajangan (S10), Umbul Londo (S11), Umbul Permai (S12), dan Umbul Seturan (S13), yang berada pada elevasi 148-329 m.dpl. Secara teoritis, pengambilan airtanah di sumur bor akan berpengaruh jika terdapat interkoneksi hidraulik antara sumur bor dengan sumur gali dan mataair. Pada penelitian ini, interkoneksi hidraulik antara sumur bor dengan sumur gali dan mataair dilakukan menggunakan isotop lingkungan (D, 3H dan 18O). Penelitian diawali dengan menentukan lokasi pengambilan sampel airtanah berdasarkan peta topografi dan kondisi hidrologi; sampel airtanah diambil dari sumur bor, sumur gali dan mataair sebanyak 30 ml dan 1.000 ml; rasio isotop δD dan δ18O pada sampel airtanah diukur dengan liquid-water stable isotope analyzer LGR DLT-100, sedangkan kadar tritium diukur dengan Liquid Scientillation Counter (LSC) Tri Carb 1900 TR. Genesis sampel airtanah ditentukan berdasarkan komposisi isotop (δ18O, δD) dengan mengacu pada persamaan Merapi Meteoric Water Line (MMWL); sedangkan untuk memastikan adanya interkoneksi hidraulik, maka hasil pengukuran kadar tritium dianalisis dengan tritium dating method. Hasil penelitian menunjukkan bahwa genesis airtanah di BH1, BH2, BH3, dan BH4 berbeda dengan genesis airtanah sumur gali dan mataair di bawahnya. Sehingga dapat disimpulkan airtanah sumur bor di BH1, BH2, BH3, dan BH4 tidak memiliki interkoneksi hidraulik dengan airtanah di sumur gali W7, W8, W9, W11 dan W12, maupun airtanah di mataair S8, S9, S10, S11, S12, dan S13. Sedangkan airtanah di sumur bor BH5, W7, S11 dan S12 memiliki genesis yang sama, dengan rasio isotop berkisar antara ‒40,40‰ sd. ‒39,20‰ untuk δD dan ‒6,59‰ sd. ‒6,51‰ untuk δ18O, sehingga diperkirakan airtanah di BH5 memiliki interkoneksi hidraulik dengan airtanah di W7, S11 dan S12. Kadar tritium di BH5 = 2,9TU lebih muda daripada umur tritium di W7 (= 1,7TU), S11(=2,5TU) dan S12 (= 1,4TU), sehingga diperkirakan airtanah di BH5 mengalir ke W7, S11 dan S12. Sedangkan komposisi isotop airtanah di S8, S9, dan S10 adalah ‒36,65‰ sd. ‒35,98‰ untuk δD dan ‒6,19‰ sd. ‒6,09‰ untuk δ18O. Nilai komposisi isotop airtanah di S8, S9, dan S10 hampir berimpit dengan garis MMWL, sehingga dapat disimpulkan sebagian besar airtanah di S8, S9, dan S10 berasal dari airhujan lokal.  ABSTRACTTo meet the needs of clean water for the people in the former of mount Merapi eruption disaster area at Sleman Regency, it has been made five boreholes at Dusun Srunen (BH1), Pagerjurang (BH2), Ngepring (BH3), Kuweron (BH4), and at Dusun Bubur (BH5). The groundwater abstraction of 9-10 liters.sec‒1 on each boreholes which located at an elevation of between 544 to 846 m.asl, with depths of between 98 to 146 m is feared will influence water-level of the dug wells at Dusun Pendowoharjo (W7), Ngaglik (W8), Gebang (W9), Condong Catur (W10), wells UGM (W11) and also will influence water-level of the springs of Jogopaten (S9), springs of Pajangan (S10), springs of Londo  (S11), springs of Permai (S12), and the springs of Seturan (S13) which located at an elevation of 148-280 m.dpl. Theoretically, groundwater abstraction on boreholes will take effect if there is a hydraulic interconnection between the boreholes with dug wells and springs. The hydraulic interconnection between the boreholes with dug wells and springs investigated using natural isotopes (D, 3H and 18O). The research initiated by determining the location of groundwater sampling based on topographic maps and hydrological conditions; groundwater samples taken from boreholes, dug wells and springs as much as 30 ml and 1.000 ml; δD and δ18O isotope ratios of groundwater samples were measured using a Liquid-Water Stabel Isotope Analyzer LGR DLT -100, while the tritium levels were measured by Liquid Scientillation Counter (LSC) Tri Carb 1900 TR. Isotope ratios of  δD and δ18O were analyzed by referring to Merapi Meteoric Water Line (MMWL) to determine the genesis of groundwater samples, whereas the rate of tritium were analyzed using tritium dating method to ensure the hydraulic interconnection. The results of this research is the isotopic composition of groundwater in the BH1, BH2, BH3, and BH4 different with isotopic composition of groundwater in dug wells (W) and springs (S). It is indicated that there is no a hydraulic interconnection of groundwater system between BH1, BH2, BH3, and BH4 with groundwater system of W7, W8, W9, W10 and W11 and the S9, S10, S11, S12, and S13. While groundwater in BH5, W9 and S13 have the same genesis with isotope ratios ranged from ‒6,53‰ to ‒6,63‰ for δ18O and ‒40,9‰ to ‒40,3‰ for δD, therefore it is estimated that there is a hydraulic interconnection between BH5 with W9 and S13.  Levels of tritium in BH5 = 2,9TU is younger than W9 (= 2,3TU) and S13 (= 2,2TU), it is estimated that groundwater in BH5 flows to Gebang well (W9) and Seturan springs (S13). Isotopic composition of groundwater in S9, S12, and W11 ranged from ‒6,24‰ to ‒6,02‰ for δ18O and ‒36,7‰ to ‒35,4‰ for δD. These isotope ratios are similar to the isotopic composition of rainfall on MMWL. Therefore, the most of the groundwater in the S9, S12, and W11 derived from local rainfall.
KERENTANAN AIRTANAH TERHADAP PENCEMARAN DAERAH IMBUHAN PONOR DI KARST GUNUNG SEWU (STUDI DI DAERAH ALIRAN SUNGAI BAWAH TANAH BRIBIN) (Ground Water Vulnerability to Contamination of Swallow Holes Recharge Area at Gunung Sewu Karst (Study in Bribin) M. Widyastuti; Sudarmadji Sudarmadji; Sutikno Sutikno; Heru Hendrayana
Jurnal Manusia dan Lingkungan Vol 19, No 2 (2012): Juli
Publisher : Pusat Studi Lingkungan Hidup Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jml.18529

Abstract

ABSTRAKAirtanah karst merupakan salah satu sumbedaya alam yang potensial di kawasan karst Gunung Sewu. Di sisi lain, akuifer karst sangat rentan terhadap pencemaran. Sungai Bawah Tanah Bribin menjadi sumber air utama untuk masyarakat khususnya untuk mendukung kebutuhan air di musim kemarau. Tujuan pene1itian ini adalah: 1) mengetahui karakteristik daerah imbuhan ponor me1alui identifikasi variabel kerentanan (kondisi ponor, lereng, vegetasi, tanah dan batuan); dan 2) mengetahui tingkat kerentanan airtanah terhadap pencemaran dengan metode COP. Ponor, gua, dan dolin diidentifikasi melalui sensus, sedangkan pengambilan sampel tanah secara purposive berdasarkan unit seri tanah. Proses pengolahan data mendasarkan metode COP, yang merupakan akronim C (concentration offlowkonsentrasi aliran), 0 (overlaying layerllapisan pelindung) and P (precipitation/curah hujan). Setiap variabel dan sub variabel mempunyai nilai di setiap ke1as dan dihitung melalui operasi perkalian dan penjumlahan. Hasil menunjukkan bahwa karakteristik daerah imbuhan ponor bervariasi menurut aspekjumlah, ukuran, lokasi dan kondisi ponor; lereng dan vegetasi, jenis tanah dan batuan serta ketebalannya. Tingkat kerentanan airtanah terhadap pencemaran sebagain besar sangat rentan. Faktor yang mempunyai pengaruh besar adalah konsentrasi aliran. Jumlah ponor sebagai imbuhan terkonsentrasi (titik) dari aliran permukaan menyebabkan sangat rentan.ABSTRACTKarst groundwater is one of the potential natural resources in the Gunung Sewu karst area. On the other hand, karst aquifers are highly vulnerable to contamination. Bribin underground river become the main water source for the community, especially to support the water demand in the dry season. The purposes of this study are: 1) to know the characteristics of the swallow holes recharge area through identifiying vulnerability variables (swallow hole condition, slope, vegetation, soil and rock), and 2) to assess the level of groundwater vulnerability to contamination which is assessed by COP method. Swallow holes, caves and doline are identified by census, while soil sampling are done by purposive sampling using soil series unit. The data processing method based on COP, which is an acronym of C (concentration of flow), O (overlaying layer) and P (precipitation). Each variable and sub-variables have value at each class, and then performed with the operation of multiplication and addition. The results showed that characteristics of swallow holes recharge area varies from aspects of the number, demension, location, and conditon of swallow holes, slope and vegetation, soil and rock thickness. The level of groundwater vulnerability to contamination in the research area is mostly very high vulnerable. The factor that has a large contribution is the variable of flow concentration. Number of swallow holes as a point recharge of surface flow that makes very vulnerable.
KELAYAKAN PEMANFAATAN LAHAN BEKAS TAMBANG BATUBARA UNTUK RELOKASI PERMUKIMAN PENDUDUK: STUDI KASUS AREAL TAMBANG PT. KITADIN (Feasibility of Former Coal-Mined Land for Resettlement A Case Study at PT. Kitadin) Retno Wuryandari; Heru Hendrayana; Dwikorita Karnawati
Jurnal Manusia dan Lingkungan Vol 12, No 1 (2005): Maret
Publisher : Pusat Studi Lingkungan Hidup Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jml.18631

Abstract

ABSTRAKPenelitian ini bertujuan untuk mengevaluasi kelayakan tanah dan air di lahan penambangan batubara untuk area pemukiman. Penelitian di lakukan di daerah pertambangan batubara PT. Kitadin di kabupaten Kutai Kertanegara, provinsi Kalimantan Timur. Data untuk penelitian ini diperoleh dari survei lapangan dan sumber sekunder. Parameter yang dianalisis meliputi Soil Index Test, Grain Size Distribution, Density and Permeability. Parameter sample air meliputi pH, turbiditas, Total Dissolved Solid (TDS), Mangaan (Mn) dan Besi (Fe). Data tersebut dibandingkan dengan kriteria penggunaan lahan untuk mengevaluasi kadar kelayakan/kesesuaian lahan. Hasil menunjukkan bahwa daerah penelitian tertutup lempung dengan plastisitas kurang dari 50%. Akumulasi air dalam lubang daerah penambangan batubara tidak masam dan memadai untuk konsumsi publik pada masa yang akan datang. Secara umum, daerah penelitian di pertambangan memadai untuk daerah permukiman. ABSTRACTConducted in PT. Kitadin coal-mined area which is located in Kutai Kartanegara Regency, East Kalimantan Timur Province, the research aimed to evaluate the feasibility conditions of soils and water at the coal-mined lands for settlement area. Data for the research were obtained from both field survey and secondary sources. The soil parameters analysed were Soil Index Test. Grain Size distribution, Density and Permeability. Water sample parameters analysed covered: pH, Turbidity, Total Dissolved Solid (TDS), Manganese (mn) and Iron (Fe). The data were compared with land use criteria to evaluate land feasibility class. The results showed that the study area is covered by clay with its plasticity less than 50%. Meanwhile, the accumulated water in the hole of coal-mined area is not acid and adequate for future public consumption the future. Therefore, in general, the study area is considered appropriate and feasible for settlement.
PENENTUAN ZONA PERLINDUNGAN SUMBER AIR BAKU PADA SUMUR BOR MOJOSONGO, KADIPIRO DAN JEBRES KOTA SOLO PROPINSI JAWA TENGAH (Delimination of Water Resources Protection Zone in Production Wells of Mojosongo, Kadipiro, Ngadisono and Jebres Solo City Central) Ryllia Ekklessia; Sukandarrumidi Sukandarrumidi; Heru Hendrayana
Jurnal Manusia dan Lingkungan Vol 12, No 2 (2005): Juli
Publisher : Pusat Studi Lingkungan Hidup Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jml.18638

Abstract

ABSTRAKPenentuan zona perlindungan sumber air baku pada dasarnya dimaksudkan untuk melindungi kualitas dan kuantitas air bawah tanah secara alamiah. Penerapan zona perlindungan sumber air baku bertujuan untuk meminimasi efek polutan terhadap sumber air. Daerah penelitian adalah kota Solo, jawa Tengah, termasuk di dalamnya Mojosongo, Kadipiro, Ngadisono dan Jebres. Penelitian ini berhasil menentukan zona perlindungan sumber air baku di daerah penelitian dan juga mengidentifikasi penggunaan lahan serta aktivitas manusia di wilayah tersebut. ABSTRACTThe delimination of the Water Resources Protection Zone is basically intended for naturally protecting groundwater quality and groundwater quantity. The application of Water Resources Protection Zone program has aimed at minimizing pollutant effects to water resources. The research area is Solo City Central Java, which includes Mojosongo, Kadipiro, Ngadisono, and as the land uses and human activities within zones.
PEMODELAN PENYEBARAN BATUAN POTENSIAL PEMBENTUK ASAM PADA KAWASAN PENAMBANGAN BATUBARA TAMBANG TERBUKA DI MUARA LAWA, KABUPATEN KUTAI BARAT, KALIMANTAN TIMUR (Modeling Distribution of Rock Potential Acid Forming in Open Pit Coal Mining Areas) Shalaho Dina Devy; Heru Hendrayana; Dony Prakasa Eka Putra; Eko Sugiharto
Jurnal Manusia dan Lingkungan Vol 23, No 1 (2016): Maret
Publisher : Pusat Studi Lingkungan Hidup Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jml.18770

Abstract

ABSTRAKDampak penambangan batubara tambang terbuka adalah munculnya Air Asam Tambang (AAT) di sekitar lingkungan penambangan yang mempengaruhi kualitas air tambang, biota air, kualitas air dan tanah. Oleh karena itu, informasi awal untuk mengantisipasi dampak tersebut, yaitu identifikasi batuan yang berpotensi asam dan memodelkan penyebarannya. Kajian geologi dan mineralogi batuan berperan dalam mengetahui penyebaran batuan Potential Acid Forming (PAF) dan Non Acid Forming (NAF). Kawasan tambang yang digunakan sebagai model penelitian berada di Kecamatan Muara Lawa, Kabupaten Kutai Barat, Kalimantan Timur. Hasil dari penelitian mengindikasikan, bahwa dominasi PAF berada di lapisan batu lempung kemudian diikuti batu lanau dan batu pasir dengan penyebaran mengikuti struktur sinklin yang terbatas di lapisan bawah (floor) dan lapisan antara (inter burden) pada batubara. Sementara itu, batuan NAF menyebar menempati daerah selain batuan PAF.ABSTRACTThe impact of open pit coal mining is the emergence of Acid Mine Water (AMD) around the mining environment that affect the quality of the mine water, aquatic biota, water and soil quality. Therefore, early information to anticipate these impacts is the identification potential acid rock and distribution model as a guide for the mining plan. Geological and geochemical study of rocks is important in knowing the distribution of rock Potential Acid Formning (PAF) and Non Acid Forming (NAF). Mining area which is used as a research model was in Muara Lawa, West Kutai regency, East Kalimantan province. The results of the study indicate, that the dominance of PAF are in layers followed by siltstone, claystone and sandstone with the distribution of rock following the syncline structure in the bottom (floor) layer and in the inter-burden layer on coal. Meanwhile, rock NAF spread in areas other than rock PAF.
Evaluation of Engineering Geological Conditions for Slope Stability Analysis of Diversion Tunnel Portal of Jlantah Dam, Karanganyar, Central Java Yayi Ismanda; I Gde Budi Indrawan; Heru Hendrayana
Journal of Applied Geology Vol 8, No 1 (2023)
Publisher : Geological Engineering Department Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jag.72438

Abstract

This paper presents the research results carried out to analyze the slope stability of the diversion tunnel portal of Jlantah Dam based on the quality of the rock mass. The classification of the rock mass quality at the tunnel location refers to the Geological Strength Index (GSI) method while the analysis of portal slope stability is modelled numerically with the element method using Phase2 software. The modelling of the tunnel portal slope design with and without earthquake load was carried out to obtain the safety factor (SF) value. The results showed that the study area consists of residual soil, andesite breccia and lapilli tuff rocks with rock mass quality based on the GSI value ranging from poor to fair. The inlet portal slope is composed of rocks that have poor and fair mass quality while the inlet section is composed of rocks that have poor mass quality. The SF value>1.3 for conditions without earthquake effect was achieved on slope design 1V:1.5H and SF value>1.1 for conditions with earthquake effect was achieved on slope design 1V:2H. The SRF value at the portal outlet location is greater than the SRF value at the portal inlet location for the same slope design conditions indicating that the rock mass quality at the portal outlet location is better than the rock mass quality at the portal inlet location.
Karakteristik Hidrogeologi dan Hidrogeokimia DAS Tempuran Lereng Barat Kompleks Gunungapi Bromo-Tengger Hendrayana, Heru; Riyanto, Indra Agus; Nuha, Azmin
Majalah Geografi Indonesia Vol 38, No 1 (2024): Majalah Geografi Indonesia
Publisher : Fakultas Geografi, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/mgi.89369

Abstract

Abstrak Lereng bagian barat Gunungapi Bromo meiliki peranan penting dalam penyediaan air untuk masyarakat disekitarnya. Penggunaan air tanah cukup intensif baik domestik, pertanian, dan industri pada lereng bagian barat Gunungapi Bromo. Lerang bagian barat bagian barat Gunungapi Bromo belum pernah dilakukan kajian detail baik potensi, kualitas, dan imbuhan air tanah. Kajian tersebut di tujukan untuk mengetahui kondisi air tanah di lereng bagian barat Gunungapi Bromo supaya dapat dimanfaatkan secara berkelanjutan. Metode yang digunakan dalam penelitian ini terdiri atas pengamatan batuan, pengukuran muka air tanah, pengukuran kimia air tanah TDS, pH, EC, dan suhu, analisis geokimia berdasarkan diagram piper, diagram fingerprint, dan diagram kurlov, analisis isotop asal usul air tanah dan imbuhan air tanah. Litologi di area kajian terdiri atas endapan pasir kerikilan, endapan pasir, batupasir, konglomerat, breksi laharik, lapilli tuff, tuff, breksi, dan lava andesit. Nilai TDS, pH, Suhu, dan EC di DAS Tempuran semakin meningkat dari hulu ke hilir. Pola aliran air tanah pada DAS Tempuran secara umum mengalir dari arah selatan menuju utara. Satuan lava dan breksi andesit merupakan akuifer, lava andesit dan breksi andesit merupakan akuiklud, jatuhan piroklastik merupakan akuifer, dan tuf dan lapilli tuf merupakan akuitard. Tipe air tanah pada DAS Tempuran didominasi oleh tipe kalsium bikarbonat (diagram piper) dan kalsium magnesium bikarbonat (diagram kurlov), dan diagram fingerprint terdapat 3 sistem air tanah. Sampel air tanah di DAS Tempuran keseluruhan berasal dari air meteorik. Imbuhan air tanah di DAS termpuran berasal dari elevasi 430-805 mdpl. Daerah imbuhan air tanah terdapat di Kecamatan Pasepran, Puspo, dan Tutur. Air tanah di area kajian secara kualitas dan kuantitas tergolong sangat baik.Abstract The western slopes of Mount Bromo have an important role in providing water for the surrounding community. Groundwater use is quite intensive, both domestically, agriculturally, and industrially, on the western slopes of Mount Bromo. The western slope of Mount Bromo has never had a detailed study of its potential, quality, and groundwater recharge. The study was aimed at determining the condition of groundwater on the western slopes of Mount Bromo so that it can be used sustainably. The methods used in this research consist of rock observations, measurements of groundwater levels, measurements of groundwater chemistry (TDS, pH, EC, and temperature), geochemical analysis based on Piper diagrams, fingerprint diagrams, and Kurlov diagrams, isotope analysis of the origin of groundwater, and recharge. groundwater. The geology in the study area consists of gravelly sand deposits, sandstone, conglomerate, laharic breccia, lapilli tuff, andesite breccia, and andesitic lava. The TDS, pH, temperature, and EC values in the Tempuran watershed increase from upstream to downstream. The groundwater flow pattern in the Tempuran watershed generally flows from south to north. Units of lava and andesite breccia are aquifers; andesite lava and andesite breccia are aquicludes; pyroclastic falls are aquifers; and tuff and tuff lapilli are aquitards. The groundwater types in the Tempuran watershed are dominated by calcium bicarbonate (Piper diagram) and calcium magnesium bicarbonate (Kurlov diagram), and in the fingerprint diagram, there are 3 groundwater systems. The entire groundwater sample in the Tempuran watershed comes from meteoric water. Groundwater recharge in the purest watershed comes from an elevation of 430–805 meters above sea level. Groundwater recharge areas are in the Pasepran, Puspo, and Tutur Districts. The study area’s groundwater quality and quantity are rated as very good
Kesesuaian Lahan Untuk Tanaman Kopi di Area Sekitar Danau Toba Riyanto, Indra Agus; Hendrayana, Heru; Sambodo, Ahmad Priyo; Widyaningsih, Yuli; Jayanto, Galih Dwi
Majalah Geografi Indonesia Vol 38, No 2 (2024): Majalah Geografi Indonesia
Publisher : Fakultas Geografi, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/mgi.94042

Abstract

Abstrak Youngest Toba Tuff (YTT) merupakan material pembentuk tanah andosol yang dominan di Kaldera Toba. YTT memiliki karakteristik yang berbeda dengan tanah andosol hasil dari material gunungapi aktif. YTT tersusun atas material ignimbrite tebal yang kaya akan batuapung. Material YTT tersebut tergolong subur untuk berbagai jenis tanaman yang ada pada Kaldera Toba bagian dalam. Kajian kesesuaian lahan untuk peruntukan tanaman tertentu belum pernah dilakukan di Kaldera Toba bagian dalam. Oleh karena itu penelitian ini bertujuan untuk mengkajian kesesuaian lahan untuk tanaman kopi. Metode yang digunakan adalah weight matching dengan konsep faktor terberat menjadi penentu klasifikasi utama kelas kesesuaian lahan. Unit analisis yang digunakan dalam penelitian ini adalah sistem lahan. Karakteristik klimatologi DTA Danau Toba sesuai untuk tanaman kopi dengan curah hujan 2.000-2.500 mm/tahun, bulan kering < 2 bulan, suhu 18,4-19,4°C, dan kelembaban 84-91%. karakteristik fisik tanah DTA Danau Toba Toba dominan termasuk sesuai (S2) dengan bahan organik (BO) 1-2%, tekstur geluh pasiran, dan permeabilitas agak cepat. Kelas S2 terdapat pada sistem lahan MBI, SAR, BTA, dan BTG, dan TWI. Kelas tidak sesuai (N) terdapat pada sistem lahan ASA dan BTG dengan kedalaman tanah tipis (<25cm) dan tekstur lempung liat. Kelas kesesuaian lahan sesuai marginal (S3) terdapat pada sistem lahan BBG, BPD, BPP, SLK, dan TBG. Kelas kesesuaian lahan sangat sesuai (S1) terdapat pada sistem lahan UBD dan SLK dengan dengan berat volum (0,8-1,1 gram/cm3), kedalaman tanah (75-100) cm, BO (>3%), permeabilitas cepat, dan tekstur geluh pasiran. Formasi YTT termasuk dalam kelas kesesuaian lahan S1 dan S2 untuk tanaman kopi, sedangkan material endapan danau, dan lava termasuk kelas S3 dan N untuk tanaman kopi.  Abstract Youngest Toba Tuff (YTT) is the dominant andosol soil-forming material in the Toba Caldera. YTT has different characteristics from the andosole soil resulting from active volcanic material. YTT is composed of thick ignimbrite material that is rich in pumice. YTT material belongs fertile to various kinds of plants that exist on the Toba Caldera inside. Soil suitability studies to have never been carried out in the inner Toba caldera. Therefore, this study aims to examine the suitability of the soil for coffee crops. The method used is weight matching with the concept of the heaviest factor being the primary determinant of the classification of the land suitability class. The unit of analysis used in this study is the land system. Climate Characteristics Toba Caldera is suitable for coffee plants with rainfall of 2,000-2.500 mm/year, dry months < 2 months, temperature 18,4-19,4°C, and humidity 84-91%. Dominant Toba Caldera soil physical characteristics include matching (S2) with organic material (BO) 1-2%, sandy loam texture, and relatively fast permeability. Class S2 is available on MBI, SAR, BTA, and BTG, and TWI land systems. The class non-conform (N) is found on ASA, BTG land systems with thin soil depths (<25cm) and clay texture. Marginal soil compatibility classes (S3) are found on BBG, BPD, BPP, SLK, and TBG soil systems. Very suitable soil (S1) is present on UBD and SLK soil system with volume weights (0.8-1,1 grams/cm3), soil deep (75-100) cm, BO (>3%), fast permeability, and sandy loam textures. YTT material belongs to the soil suitability classes S1 and S2 for coffee plants, while lake sediment and lava are classified in the classes S3 and N for coffee plantations. 
Groundwater quality assessment in different volcanic rocks using water quality index in the tropical area, Indonesia Hendrayana, Heru; Riyanto, Indra Agus; Ismayuni, Novia; Nuha, Azmin; Muhammad, Azwar Satrya; Fadillah, Arif
Journal of Degraded and Mining Lands Management Vol. 11 No. 4 (2024)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2024.114.6225

Abstract

Groundwater is the main water source that is most widely used in the world, one of which is in Indonesia. One of the uses of groundwater is for consumption needs. Therefore, the groundwater used should have good water quality. For this reason, this study aimed to determine groundwater quality in Indonesia during the dry season and make recommendations for groundwater management policies. A total of 211 groundwater samples taken from springs, drilled wells, and dug wells spread across volcanic areas on the islands of Sumatra, Java, Bali, and Sulawesi were collected to test their quality in this research. The method used in this research consisted of 4 analyses: WHO threshold analysis, Piper Diagram, Water Quality Index (WQI), and statistical correlation and regression. Based on the analysis, it was discovered that 47 K+ samples, 1 Na+ sample, 5 Ca2+ samples, 1 Cl- sample, 115 HCO3- samples, 3 TDS samples, and 3 pH samples exceeded WHO standards. The results of the Piper triangle diagram analysis showed that the majority of groundwater in Indonesia falls into the Unpolluted Groundwater classification (categories D and G), and the results of the WQI analysis also showed that 98% of the groundwater in Indonesia analyzed falls into the excellent and good water categories. The results of statistical analysis of the parameters K+, Na+, Mg2+, Ca2+, SO42-, Cl-, HCO3-, TDS, and pH showed that all these parameters are strongly and positively correlated with the WQI value.
Co-Authors Agung Harijoko Agung Setianto Agus Budhie Wijatna Agus Budhie Wijatna Agus Budhie Wijatna Agus Budhie Wiyatna Agus Darmawan Adi Ahmad Rif’an Khoirul Lisan Alwan Satapona Amin, Muhammad Fakhriudin Falam Arif Fadillah Azmin Nuha Azmin Nuha Azmin Nuha Azmin Nuha Azmin Nuha Azmin Nuha Azmin Nuha Azmin Nuha Azwar Satry Muhammad Briyan Aprimanto Briyan Aprimanto Budiarjo Budiarjo Bunchoeun Pich Chhuon Kong Devy, Shalaho Dina Dharmawan, Krisna Indra Doni Prakasa Eka Putra Dony Prakasa Eka Putra Doung Rata Dwikorita Karnawati Erwindy, Jossi Harizona Aulia Rahman Hendy Setiawan Hiroshi Kawase Hnin Thandar Phyu I Gde Budi Indrawan I Wayan Warmada Indra Agus Riyanto Indra Agus Riyanto Indra Agus Riyanto Indra Agus Riyanto Indra Agus Riyanto Indra Agus Riyanto Ismayuni, Novia Jayanto, Galih Dwi Jinno, Kenji Kamai, Toshitaka Kawase, Hiroshi Kenji Jinno Keophousone Phonhalath Kong, Chhuon Leakhena Snguon M Widyastuti M. Widyastuti M. Widyastuti M. Widyastuti Muhammad Iqbal Muhammad Iqbal Muhammad, Azwar Satry Muhammad, Azwar Satrya Myo Thant Nuha, Azmin Phetnakhone Xaixongdeth Phonhalath, Keophousone Phyu Phyu Thin Phyu, Hnin Thandar Pich, Bunchoeun Ponhalath Xaixongdeth Rata, Doung Razi, Faizal Retno Wuryandari Retno Wuryandari, Retno Riyanto, Dwi Siswo Riyanto, Indra Agus Ruslisan Ruslisan Ryllia Ekklessia Ryllia Ekklessia, Ryllia S Sunarno Sabdo Sumartono Sambodo, Ahmad Priyo Satapona, Alwan Sato, Tsutomo Sato, Tsutomu Satoru Kawasaki Saw Aung Zaw Aye Shinta Dwi Novianti Snguon, Leakhena Souvannachith, Thilavanh Subagyo Pramumijoyo Subagyo Pramumijoyo, Subagyo Sudarmadji Sudarmadji Sudarmadji Sudarmadji Sudarmadji Sudarmadji Sudarmadji Sudarmadji Sudarmadji Sukandarrumidi Sukandarrumidi Sukandarrumidi Sukandarrumidi, Sukandarrumidi Sunarno Sunarno Sunarno Sunarno Sutikno Sutikno Sutikno Sutikno Sutikno Sutikno T. Putranto, Thomas Tetsuro Yoneda Thandar Phyu, Hnin Thant, Myo Thilavanh Souvannachith Thomas T. Putranto Thomas Triadi Putranto Thomas Triadi Putranto, Thomas Triadi Toshitaka Kamai Tsutomo Sato Tsutomu Sato Wahyu Wilopo Wawan Budianta Widyaningsih, Yuli Wiyatna, Agus Budhie Xaixongdeth, Phetnakhone Xaixongdeth, Ponhalath Yayi Ismanda Yoneda, Tetsuro Yosua Priambodo Yuli Widyaningsih Zaw Aye, Saw Aung