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All Journal Indonesian Journal of Geography Geo Media: Majalah Ilmiah dan Informasi Kegeografian Jurnal Ilmu Lingkungan POSITRON Media Komunikasi Geografi Journal of Degraded and Mining Lands Management Jurnal Sumberdaya Alam dan Lingkungan Forum Geografi Journal of Geosciences and Environmental Studies
Langgeng Wahyu Santosa
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Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Earth & Planetary Sciences Education Energy Environmental Science Physics Social Sciences

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Hydromorphology of the Unconfined Groundwater in the South of Klaten District (Data Before Earthquake Mei 27th 2006) Santosa, Langgeng Wahyu
Forum Geografi Vol 20, No 2 (2006): December 2006
Publisher : Universitas Muhammadiyah Surakarta

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Abstract

There are some characteristics and distributions of unconfined groundwater variation in the research area. Those are related to a system of water supply and consumptive use for drinking water. Variation of the groundwater characteristic depends on variation of morphology. Therefore, it is needed to delineate hydromorphology units of the regions as a base on groundwater resources management, especially for drinking water. The aims of the research are: (1) to study of the characteristic and distribution of unconfined groundwater variations base on landform units, (2) to study the factors that affect such variations, and (3) to establish the hydromorphology units of the regions for groundwater resources management, especially for drinking water. The method used in this research is landform approach and field survey. The sampling method is stratified sampling, based on landform as the analysis approach. Result of the research shows that there are some variations of groundwater characteristic at each landform. Landforms which have good groundwater characteristic are Hydromorphology Unit of Fluvio Volcanic Plain of Young Merapi (except Bayat region) and Hydromorphology Unit of Volcanic Foot Plain of Young Merapi. At those units, there are good quality of groundwater, bicarbonate water (hydrochemical type I), having low electric conductivity, shallow of water table, low in fluctuation, and middle to fast class in aquifer permeability. Those units are the most potential unconfined groundwater resources management for drinking water. The units which have poor groundwater characteristic are Hidromorphology Unit in Bayat Region, including Undulating Alluvial Plain, Fluvio Volcanic Plain of Young Merapi, and Swamp Alluvial Plain. Generally, the groundwater quality is medium to poor, the hydrochemical type is Va (initiation process of connate water) and type III (evaporate water), shallow up to medium of water table, and low to middle class of aquifer permeability. The taste of groundwater is brackish to saline with high concentration of chloride.
Kajian Hidrogeomorfologi Mataair di Sebagian Lereng Barat Gunungapi Lawu Santosa, Langgeng Wahyu
Forum Geografi Vol 20, No 1 (2006): July 2006
Publisher : Universitas Muhammadiyah Surakarta

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Abstract

Magma activities on earth surface cause dynamic of volcanic morphology from the volcanic cone up to fluvial volcanic plain. The changing of morphology is always followed by different slope, composition and thickness of material, and break of slope. This geomorphological conditions result in groundwater emerges forming spring belt. Accordingly, wether such phenomena are also the case in the west slope of Lawu volcano is investigated in this reseach. Hydrogeomorphology approach is applied to study of the spring characteristic and distribution in the research area. The result research shows that the distribution pattern of springs in the west slope of Lawu volcano is not like spring belt perfectly, like the strato volcano generally. It is caused by erosion processes, mass wasting intensively, Lawu fault and other faults. Most springs flow on the volcanic slope and volcanic foot morphology.
The Investigation of Groundwater Potential by Vertical Electrical Sounding (VES) Approach in Arguni Bay Region, Kaimana Regency, West Papua Santosa, Langgeng Wahyu; Adji, Tjahyo Nugroho
Forum Geografi Vol 21, No 1 (2007): July 2007
Publisher : Universitas Muhammadiyah Surakarta

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Abstract

This research was conducted within some villages in the surrounding area that administratively including Arguni Bay District, Kaimana Regency, West Papua. The main objective of this study is to vertically measure resistivity value of aquifer with the intention of recognizing deep groundwater potency as a source of native’s domestic needs. In addition, VES method by Schlumberger electrode array was applied within 18 locations, which expectantly represent the whole area of research. The resistivity data is then interpreted by IP2Win 2.1 Geoelectric Software to entirely describe the aquifer system as well as the occurrence of groundwater. The result indicates that vertically, the aquifer system is dominated by interbedded of claystone and sandstone (argillite group) as a past marine environment mineral. In addition, geomorphological and resistivity sounding interpretation gives a viewpoint that the landforms of the research area may be typified as Structural Mountain with the slope direction is towards the island beaches. Also, structurally, the main groundwater system is fractured aquifer with very limited productivity of groundwater resources. As consequences, this aquifer is more to be an aquitard, rather than an aquifer.
Kajian Hidrogeomorfologi Mataair di Sebagian Lereng Barat Gunungapi Lawu Santosa, Langgeng Wahyu
Forum Geografi Vol 20, No 1 (2006): July 2006
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v20i1.1805

Abstract

Magma activities on earth surface cause dynamic of volcanic morphology from the volcanic cone up to fluvial volcanic plain. The changing of morphology is always followed by different slope, composition and thickness of material, and break of slope. This geomorphological conditions result in groundwater emerges forming spring belt. Accordingly, wether such phenomena are also the case in the west slope of Lawu volcano is investigated in this reseach. Hydrogeomorphology approach is applied to study of the spring characteristic and distribution in the research area. The result research shows that the distribution pattern of springs in the west slope of Lawu volcano is not like spring belt perfectly, like the strato volcano generally. It is caused by erosion processes, mass wasting intensively, Lawu fault and other faults. Most springs flow on the volcanic slope and volcanic foot morphology.
Identification of Land Degradation and Method of Solution in Zone of Baturagung Hill at Gunung Kidul Regency Santosa, Langgeng Wahyu
Forum Geografi Vol 19, No 1 (2005): July 2005
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v19i1.4571

Abstract

Baturagung hill is a folded hill range consisting mainly of Tertiary volcanic rocks which have been undergoing severe faulting, jointing and weathering. Lies on the altitude between 200 and 700 meter from see level, the area is characterized by sloping to steep relief with 30% to >40% of slope, and shallow soils with scattered outcrops. Such geomorphological setting has made the area subject to intense soil erosion and masswasthing. Mining activates has also been accounted for the explanation of the current heightened land degradation in the area. The present paper, accordingly, is intended to identify the land degradation by considering mass movement, bare land, and mining activity parameters. The present paper founds that the Baturagung hill can be divided into three zones, namely: (1) the zone of no to low degradation (hill slope and inter-hill valley); (2) the zone of high degradation rate (within the area having 30 to 40% of slope); and (3) the zone of severe degradation (within the area having slope of more than 45%).
Hidrostratigrafi Akuifer sebagai Geoindikator Genesis Bentuk Lahan di Wilayah Kepesisiran Kabupaten Kulonprogo, Daerah Istimewa Yogyakarta Santosa, Langgeng Wahyu
Forum Geografi Vol 26, No 2 (2012): December 2012
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v26i2.5070

Abstract

Purpose of this research is to study on aquifer hydrostratigraphy that can be a geo-indicator of geomorphological processes on the past, that describe of landform genetic in the research area. The research method is survey. The framework of analysis in this research is landform genetic. The results of the research indicate that: (1) "the forming of aquifer hydrostratigraphy in the research area is controlled by some of main processes in geomorphology, that show of landform genetic specifically". The research area consists of 3 aquifer hydrostratigraphy systems, each of the aquifer system has the typical characteristic, showed by system and pattern of material stratigraphy in the aquifer and variation of groundwater characteristic in the unconfined aquifer. (2) "spatiotemporally, landform genetic in the research area influences on the forming of aquifer hydrostratigraphy in the 3 phases, i.e. the first stage at the end of the Tertiary epoch (end of Pliocene era), second stage at the Quaternary epoch (as long as the Pleistocene period), and third stage at the Holocene era". The genesis and chronology of landform forming in the 3 phases above influence on the forming of system and pattern of aquifer hydrostratigraphy in the research area.
The Investigation of Groundwater Potential by Vertical Electrical Sounding (VES) Approach in Arguni Bay Region, Kaimana Regency, West Papua Santosa, Langgeng Wahyu; Adji, Tjahyo Nugroho
Forum Geografi Vol 21, No 1 (2007): July 2007
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v21i1.1820

Abstract

This research was conducted within some villages in the surrounding area that administratively including Arguni Bay District, Kaimana Regency, West Papua. The main objective of this study is to vertically measure resistivity value of aquifer with the intention of recognizing deep groundwater potency as a source of native’s domestic needs. In addition, VES method by Schlumberger electrode array was applied within 18 locations, which expectantly represent the whole area of research. The resistivity data is then interpreted by IP2Win 2.1 Geoelectric Software to entirely describe the aquifer system as well as the occurrence of groundwater. The result indicates that vertically, the aquifer system is dominated by interbedded of claystone and sandstone (argillite group) as a past marine environment mineral. In addition, geomorphological and resistivity sounding interpretation gives a viewpoint that the landforms of the research area may be typified as Structural Mountain with the slope direction is towards the island beaches. Also, structurally, the main groundwater system is fractured aquifer with very limited productivity of groundwater resources. As consequences, this aquifer is more to be an aquitard, rather than an aquifer.
Hydromorphology of the Unconfined Groundwater in the South of Klaten District (Data Before Earthquake Mei 27th 2006) Santosa, Langgeng Wahyu
Forum Geografi Vol 20, No 2 (2006): December 2006
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v20i2.1809

Abstract

There are some characteristics and distributions of unconfined groundwater variation in the research area. Those are related to a system of water supply and consumptive use for drinking water. Variation of the groundwater characteristic depends on variation of morphology. Therefore, it is needed to delineate hydromorphology units of the regions as a base on groundwater resources management, especially for drinking water. The aims of the research are: (1) to study of the characteristic and distribution of unconfined groundwater variations base on landform units, (2) to study the factors that affect such variations, and (3) to establish the hydromorphology units of the regions for groundwater resources management, especially for drinking water. The method used in this research is landform approach and field survey. The sampling method is stratified sampling, based on landform as the analysis approach. Result of the research shows that there are some variations of groundwater characteristic at each landform. Landforms which have good groundwater characteristic are Hydromorphology Unit of Fluvio Volcanic Plain of Young Merapi (except Bayat region) and Hydromorphology Unit of Volcanic Foot Plain of Young Merapi. At those units, there are good quality of groundwater, bicarbonate water (hydrochemical type I), having low electric conductivity, shallow of water table, low in fluctuation, and middle to fast class in aquifer permeability. Those units are the most potential unconfined groundwater resources management for drinking water. The units which have poor groundwater characteristic are Hidromorphology Unit in Bayat Region, including Undulating Alluvial Plain, Fluvio Volcanic Plain of Young Merapi, and Swamp Alluvial Plain. Generally, the groundwater quality is medium to poor, the hydrochemical type is Va (initiation process of connate water) and type III (evaporate water), shallow up to medium of water table, and low to middle class of aquifer permeability. The taste of groundwater is brackish to saline with high concentration of chloride.
Analisis Genesa Hidrogeokimia Airtanah Menggunakan Diagram Piper Segiempat di Wilayah Pesisir Afriyani, Mice Putri; Santosa, Langgeng Wahyu; Adji, TJahyo Nugroho
Media Komunikasi Geografi Vol 21, No 1 (2020)
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/mkg.v20i2.21331

Abstract

Penelitian dilakukan di wilayah Kecamatan Lhoknga Kabupaten Aceh Besar. Tujuan penelitian ini untuk menganalisis genesa hidrogeokimia airtanah di wilayah kepesisiran dan menganalis  proses-proses  hidrogeokimia yang terjadi pada airtanah bebas  pada setiap bentuklahan di wilayah kepesisiran. Pengambilan sampel dilakukan dengan mempertimbangkan variasi nilai Daya Hantar Listrik, aliran airtanah dan satuan bentuklahan. Data yang digunakan berupa kandungan ion mayor di dalam airtanah yang diperoleh berdasarkan analisis laboratorium. Analisis tipe hidrogeokimia airtanah  dilakukan dengan menggunakan  diagram piper segiempat. Berdasarkan hasil analisis diagram piper segiempat menunjukkan sebagian besar tipe hidrogeokimia pada daerah penelitian merupakan tipe airtanah semi-bikarbonat (III) yang tersebar merata pada bentuklahan fluviomarin, sementara pada bentuklahan karst, beting gisik muda dan beting gisik tua tipe airtanah semi bikarbonat (II) (tersebar mengelompok. Airtanah bikarbonat (I) terdapat pada bentuklahan karst. Airtanah evaporit (III) tersebar mengelompok pada bentuklahan beting gisik muda dan tanggul alam Selanjutnya, airtanah sulfat (IV) dapat ditemui pada bentuklahan beting gisik tua dan beting gisik muda.
Penentuan Kedalaman Interface pada Bentuklahan Lereng Gunungapi Bawah dan Bentuklahan Dataran Aluvial Kepesisiran di Pulau Ternate Salam, Ramdani; Sunarto, Sunarto; Santosa, Langgeng Wahyu
POSITRON Vol 8, No 1 (2018): May Edition
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam, Univetsitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1250.211 KB) | DOI: 10.26418/positron.v8i1.25281

Abstract

Telah dilakukan pengukuran interface menggunakan metode geolistrik 2D di wilayah pesisir Pulau Ternate. Penelitian ini dimaksudkan untuk menentukan keadaan interface dengan mengajukan asumsi sederhana yang berdasar pada prinsip trigonometri dasar. Pengukuran dilakukan di bagian barat sampai barat daya pada bentuklahan lereng gunungapi bawah dan bentuklahan dataran aluvial kepesisiran.   Hasil pengukuran geolistrik pada keseluruhan lintasan menunjukkan,  ketebalan air tawar pada bentuklahan lereng gunungapi bawah berkisar 7 - 13 m dengan nilai resistivitas antara 25,9 – 100 Ωm.   Ketebalan air tawar pada bentuklahan dataran aluvial kepesisiran antara 15 m hingga kurang dari 20 m dengan nilai resistivitas antara 30 – 109 Ωm.   Kedalaman interface pada bentuklahan lereng gunungapi bawah  sekitar 13 m dari permukaan dengan kemiringan 77o, sedang kedalaman interface pada bentuklahan dataran aluvial kepesisiran sekitar 20 m dari permukaan dengan kemiringan 81o.  Hasil pengukuran menunjukkan bahwa ketebalan air tawar di daerah pesisir bagian barat sampai baratdaya pada bentuklahan lereng gunungapi bawah lebih tipis dibandingkan dengan daerah pesisir bagian timur hingga tenggara pada bentuklahan dataran aluvial kepesisiran.
Co-Authors Afriyani, Mice Putri ANDRI KURNIAWAN Arysandi, Safira Arum Fahad Nuraini Falih, Gusti Muhammad Febriani, Yenni Kondong, Hendrik Mutaqin, Bachtiar W. Ramdani Salam Rika Harini Sudrajat Sudrajat Sudrajat Sunarto Sunarto Sunarto Sunarto Sutikno Sutikno Tadubun, Maria Riswanti Tjahyo Nugroho Adji Wiyono, Maryadi Budi