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All Journal Indonesian Journal of Geography Geo Media: Majalah Ilmiah dan Informasi Kegeografian JURNAL TEKNOLOGI LINGKUNGAN Media Komunikasi Geografi Majalah Geografi Indonesia Jurnal Wilayah dan Lingkungan Jurnal Pendidikan Geografi: Kajian, Teori, dan Praktik dalam Bidang Pendidikan dan Ilmu Geografi Dinamisia: Jurnal Pengabdian Kepada Masyarakat J SIG (Jurnal Sains Informasi Geografi) Jurnal PkM (Pengabdian kepada Masyarakat) Abdimas Mandalika
Sejati, Sadewa Purba
Program Studi Geografi, Fakultas Sains Dan Teknologi, Universitas Amikom Yogyakarta
Religion Agriculture, Biological Sciences & Forestry Arts Humanities Computer Science & IT Earth & Planetary Sciences Education Energy Environmental Science Social Sciences Other

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Tingkat Fluktuasi Air Tanah pada Jangka Pendek di Kecamatan Ngemplak, Kabupaten Sleman, Provinsi Daerah Istimewa Yogyakarta Sejati, Sadewa Purba
Jurnal Teknologi Lingkungan Vol. 22 No. 1 (2021)
Publisher : Center for Environmental Technology - Agency for Assessment and Application of Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (9719.994 KB) | DOI: 10.29122/jtl.v22i1.3985

Abstract

ABSTRACT Water is a natural resource used by people for various life necessities. The type of water often used by people is groundwater. Groundwater conditions should be inventoried to protect and maintain the continued function of groundwater. The research area was the administrative area of the Ngemplak Sub-district in Sleman Regency. Construction, growing population, and changing system positively correlate with potential disturbance to quantity, quality, and distribution of groundwater in the research area. To anticipate this, changing groundwater conditions in the administrative area of the Ngemplak Sub-district should be determined. The present study was aimed to determine the changing condition or dynamics of groundwater in the administrative area of Ngemplak Sub-district. The parameter used in the present study was the level of groundwater fluctuation. The primary data of groundwater depth in rainy and dry seasons 2019 was collected using a systematic random sampling method. Groundwater surface fluctuation data was obtained from the difference in groundwater-surface depths in dry and rainy seasons. The level of groundwater fluctuation was analyzed using the spatial interpolation method and classified using ArcGIS. The research result showed that the level of groundwater fluctuation in the research area consisted of three classes, i.e., low (<2.5 meters), medium (2.5 – 5 meters), and high (>5 meters). The research area was dominated by medium groundwater fluctuation. Spatial data analysis showed that groundwater fluctuation in the research area wasn’t only affected by reduced groundwater supply due to changing seasons but also by the massive groundwater usage. Keywords: groundwater, fluctuation, spatial interpolation   ABSTRAK Air merupakan sumberdaya alam yang digunakan penduduk untuk memenuhi beragam kebutuhan hidup. Jenis air yang seringkali digunakan penduduk adalah air tanah. Inventarisasi kondisi air tanah perlu dilakukan sebagai upaya untuk menjaga dan mempertahankan keberlanjutan fungsi air tanah. Wilayah yang menjadi perhatian dalam penelitian ini adalah wilayah Kecamatan Ngemplak, Kabupaten Sleman. Pembangunan, peningkatan jumlah penduduk, dan peralihan musim berkorelasi positif dengan munculnya potensi gangguan terhadap kuantitas, kualitas, dan distribusi air tanah di daerah penelitian. Untuk mengantisipasi hal tersebut maka perubahan kondisi air tanah di wilayah Kecamatan Ngemplak perlu diketahui. Penelitian ini bertujuan untuk mengetahui perubahan kondisi atau dinamika air tanah di wilayah administratif Kecamatan Ngemplak. Parameter yang digunakan dalam penelitian ini adalah tingkat fluktuasi air tanah. Data primer kedalaman air tanah pada musim hujan dan kemarau tahun 2019 dikumpulkan dengan metode systematic random sampling. Data fluktuasi air tanah merupakan selisih dari kedalaman air tanah pada musim kemarau dengan musim hujan. Tingkat fluktuasi air tanah dianalisis menggunakan metode interpolasi spasial dan klasifikasi dengan perangkat lunak ArcGIS. Hasil penelitian menunjukkan bahwa tingkat fluktuasi air tanah di daerah penelitian diklasifikasikan menjadi tiga kelas, yaitu rendah (<2,5 meter), sedang (2,5 – 5 meter), dan tinggi (>5 meter). Daerah penelitian didominasi oleh fluktuasi air tanah pada tingkat sedang. Analisis data spasial menunjukkan bahwa fluktuasi air tanah di daerah penelitian tidak hanya dipengaruhi berkurangnya suplai air tanah akibat perubahan musim, tetapi juga diakibatkan penggunaan air tanah dalam jumlah yang besar. Kata kunci: air tanah, fluktuasi, interpolasi spasial
Analisis Potensi Pencemaran Air Tanah Bebas di Lereng Kaki Koluvial dan Dataran Aluvial Daerah Aliran Sungai Pesing Menggunakan Integrasi Metode GOD dan SIG Berbasis Web: Analysis of Potential Groundwater Pollution in Unconfined Aquifer in Colluvial Footslopes and Alluvial Plains of the Pesing Watershed Using Integration of GOD and GIS Web Based Methods SEJATI, SADEWA PURBA; SAPUTRA, ADITYA
Jurnal Teknologi Lingkungan Vol. 23 No. 1 (2022)
Publisher : Center for Environmental Technology - Agency for Assessment and Application of Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (570.217 KB) | DOI: 10.29122/jtl.v23i1.4949

Abstract

ABSTRACT Agricultural, livestock, and domestic activities in the alluvial plains and the colluvial footslopes of the Pesing watershed have the potential to reduce groundwater quality in an unconfined aquifer. Environmental characteristics need to be identified spatially to determine the potential for groundwater contamination. The latest mapping technology also needs to be identified to determine its ability to disseminate information on potential groundwater pollution. The research was conducted to determine the potential for groundwater pollution and to identify the capability of a web-based GIS as a medium for disseminating geospatial information. Potential groundwater contamination was identified using the GOD method. The variables used include the type of aquifer, aquifer lithology, and groundwater depth. Variables of aquifer type and aquifer lithology are known through secondary data, namely drilling data, geological data, and literature studies. Variable groundwater depth is known through field surveys. Sampling method used is systematic random sampling. Each variable is classified and visualized in the form of a thematic map. Three variables were analyzed by the overlay method. Based on the results of the analysis, it is known that in the rainy season, the research area is classified into three classes of potential for groundwater pollution, namely extreme potential with a percentage of 27% area, high potential with a rate of 71%, and medium potential with a percentage of 2%. The potential for groundwater contamination during the dry season is classified into two classes: high potential with an area of 43% and medium potential with a percentage of 57%. Temporal dynamics of the potential for groundwater pollution are caused by a variable sensitive to seasonal changes, namely the depth of groundwater. The land uses that have the most influence on the potential for groundwater contamination are rice fields and livestock manure disposal. Web-based GIS can be used as a medium for disseminating information on potential groundwater pollution. The program can be appropriately operated on a variety of electronic devices. Web-based GIS is equipped with a variety of features that can be used interactively for fundamental to applied analysis. Keywords: groundwater, unconfined aquifer, GOD, GIS, web   ABSTRAK Aktivitas pertanian, peternakan, dan domestik di dataran aluvial dan dataran kaki koluvial DAS Pesing berpotensi menurunkan kualitas air tanah bebas. Karakteristik lingkungan perlu diidentifikasi secara spasial untuk mengetahui potensi pencemaran air tanah. Teknologi pemetaan terkini juga perlu diidentifikasi untuk mengetahui kemampuannya dalam mendiseminasi informasi potensi pencemaran air tanah. Penelitian dilakukan untuk mengetahui potensi pencemaran air tanah dan mengidentifikasi kemampuan sistem informasi geografis berbasis (SIG) web sebagai media diseminasi informasi geospasial. Potensi pencemaran air tanah diidentifikasi menggunakan metode GOD (groundwater occurrence, overall lithology of aquifer, depth to water table). Variabel yang digunakan meliputi jenis akuifer, litologi akuifer, dan kedalaman air tanah. Variabel jenis akuifer dan litologi akuifer diketahui melalui data sekunder, yaitu data pengeboran, data geologi, dan studi literatur. Variabel kedalaman air tanah diketahui melalui survei lapangan. Metode sampling yang digunakan adalah acak bersistem. Setiap variabel diklasifikasi dan divisualkan dalam bentuk peta tematik. Ketiga variabel dianalisis dengan metode overlay. Berdasarkan hasil analisis diketahui bahwa pada musim hujan daerah penelitian terklasifikasi menjadi tiga kelas potensi pencemaran air tanah bebas, yaitu potensi ekstrim dengan persentase luas 27%, potensi tinggi dengan persentase 71%, dan potensi sedang dengan persentase 2%. Potensi pencemaran air tanah pada musim kemarau terklasifikasi menjadi dua kelas, yaitu potensi tinggi dengan persentase luas 43% dan potensi sedang dengan persentase 57%. Dinamika temporal potensi pencemaran air tanah bebas disebabkan karena terdapat variabel yang sensitif terhadap perubahan musim, yaitu kedalaman air tanah. Penggunaan lahan yang paling berpengaruh terhadap potensi pencemaran air tanah adalah sawah dan lokasi pembuangan kotoran ternak. SIG berbasis web mampu digunakan sebagai media diseminasi informasi potensi pencemaran air tanah bebas. Program dapat dioperasikan dengan baik pada beragam perangkat elektronik. Program dilengkapi dengan beragam fitur yang dapat digunakan secara interaktif untuk analisis dasar hingga terapan. Kata kunci: air tanah, akuifer bebas, GOD, SIG, web
Perbandingan Akurasi Metode Inverse Distance Weighting dan Kriging dalam Pemetaan Kedalaman Muka Airtanah Sadewa Purba Sejati
Majalah Geografi Indonesia Vol 33, No 2 (2019): Majalah Geografi Indonesia
Publisher : Fakultas Geografi, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/mgi.41473

Abstract

Setiap metode interpolasi spasial yang disediakan oleh sitem informasi geografis (SIG) memiliki akurasi yang berbeda. Oleh karena itu pengetahuan terhadap akurasi metode tersebut sangat diperlukan oleh pengguna SIG. Penelitian ini dilakukan untuk mengetahui perbandingan akurasi metode interpolasi spasial inverse distance weighting (IDW) dan Kriging untuk menghasilkan informasi kedalaman muka airtanah. Penelitian ini menggunakan 65 data primer kedalaman muka airtanah yang diperoleh dengan metode systematic random sampling. Hasil interpolasi setiap metode kemudian dibandingkan tingkat akurasinya, yaitu dengan melihat nilai root mean square error (RMSE) dan persentase kesesuaian sampel validator terhadap model yang dihasilkan. Pengolahan data menunjukkan bahwa model interpolasi terbaik pada metode Kriging diperoleh melalui varian Ordinary Kriging. Metode tersebut menghasilkan model dengan nilai RMSE sebesar 2,98 dan kesesuaian sampel validator sebesar 50%. Sedangkan model interpolasi terbaik pada metode IDW diperoleh melalui parameter power (p) dengan nilai 3. Metode tersebut mengasilkan model interpolasi dengan nilai RMSE sebesar 3,233 dengan kesesuaian sampel validator sebesar 40%. Berdasarkan perbandingan diperoleh kesimpulan bahwa metode Kriging lebih akurat jika dibandingkan dengan metode IDW karena menghasilkan nilai RMSE yang lebih kecil dan persentase kesesuaian sampel validator terdahap model interpolasi lebih besar.  Every spatial interpolation method provided by geographic information system (GIS) has different accuracy. Therefore, it’s very necessary for GIS users to know the accuracy of every method. This study was performed to determine the comparison of accuracy of inverse distance weighting (IDW) and Kriging spatial interpolation methods to produce information on depth to water table. This study used 65 primary data of depth to water table obtained using systematic random sampling method. The interpolation result of the accuracy of every method was compared by assessing root mean square error (RMSE) and percentage of consistency of validator sample with the resulting model. Data processing showed that the best interpolation method of Kriging was Ordinary Kriging variance. The method produced a model with RMSE value of 2.98 and validator sample consistency of 50%. The best interpolation method of IDW method used power (p) parameter with a value of 3. The method produced an interpolation model with RMSE value of 3.233 and validator sample consistency of 40%. Based on the comparison, it was concluded that Kriging method was more accurate than IDW method because it had smaller RMSE value and bigger percentage of validator sample consistency to interpolation model.
Pengujian materi mitigasi bencana erupsi Merapi dengan pendekatan spasial melalui metode visual dan field trip Afrinia Lisditya Permatasari Permatasari; Sadewa Purba Sejati
Geo Media: Majalah Ilmiah dan Informasi Kegeografian Vol 16, No 2 (2018): Geo Media: Majalah Ilmiah dan Informasi Kegeografian
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (900.448 KB) | DOI: 10.21831/gm.v16i2.25205

Abstract

Aktivitas Gunungapi Merapi sebagai salah satu gunungapi paling aktif di dunia menimbulkan dampak terhadap penduduk dan lingkungan, Dampak negatif dapat dirasakan ketika terjadi bencana erupsi seperti pada tahun 2010. Salah satu upaya yang dapat dilakukan untuk meningkatkan kesadaran penduduk di kawasan rawan bencana adalah dengan memberikan sosialisasi atau informasi yang berkaitan dengan mitigasi bencana. Entitas atau obyek yang dapat dijadikan sebagai target diantaranya adalah siswa sekolah. Penelitian ini bertujuan untuk mengetahui respon entitas atau obyek terhadap informasi atau materi mitigasi bencana yang disampaikan dengan pendekatan spasial (keruangan) melalui metode visual dan field trip. Respon responden terhadap materi mitigasi bencana dianalisis dengan metode regresi linier sederhana. Angka- angka yang muncul sebagai hasil olahan data statistik menjelaskan bahwa mitigasi bencana erupsi Gunungapi Merapi secara spasial dengan metode visual dan field trip belum dapat dipahami oleh siswa. Penyebabnya adalah durasi waktu penyampaian materi yang tidak berkesinambungan dan juga faktor usia siswa.
Teknologi Geospasial Sebagai Media Pembelajaran Geografi di Lingkungan Sekolah Tingkat Menengah Sadewa Purba Sejati
Geo Media: Majalah Ilmiah dan Informasi Kegeografian Vol 19, No 1 (2021): Geo Media: Majalah Ilmiah dan Informasi Kegeografian
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/gm.v19i1.37713

Abstract

Penelitian ini bertujuan untuk mengkaji kemampuan teknologi geospasial sebagai media pembelajaran geografi di lingkungan sekolah tingkat menengah. Metode penelitian adalah simulasi pembelajaran dengan teknologi geospasial. Kemampuan teknologi geospasial sebagai media pembelajaran diketahui melalui persentase tingkat pemahaman siswa terhadap materi yang telah disampaikan. Tingkat pemahaman siswa digali melalui kuesioner. Kuesioner disusun sesuai dengan materi pembelajaran yang disampaikan pada sesi simulasi. Hasil pengolahan data menunjukkan bahwa sebanyak 85,6 % siswa memiliki tingkat pemahaman tinggi terhadap materi yang disampaiakan melalui teknologi geospasial, sedangkan sisanya berpemahaman sedang. Teknologi geospasial mempermudah siswa dalam memahami geografi. Visualisasi interaktif dan dinamis yang disajikan oleh teknologi geospasial mampu digunakan untuk menjawab pertanyaan what, where, dan when terkait dinamika geosfer dan persebarannya. Implementasi teknologi geospasial dalam pembelajaran geografi di sekolah tingkat menengah masih memerlukan kajian yang lebih komprehensif. Kesiapan tenaga pengajar, sarana, dan prasarana pembelajaran perlu diidentifikasi lebih lanjut.
The Characteristics of Shallow Groundwater Resource in Cangkringan District Sleman Province Special Region of Yogyakarta Sadewa Purba Sejati
Media Komunikasi Geografi Vol. 18 No. 2 (2017)
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/mkg.v18i2.12903

Abstract

Cangkringan District (the research site) is one of the districts in Sleman Regency of which spatial function includeswater catchment area. Holding the predicate as a water catchment area, the research area serves as one of the groundwater supply areas for the community living in Sleman Regency. One aspect of integrated water resources management is the water resources information system aspect, in which the geohydrology information system (groundwater) is included. Based on the aspect of water resources management, the study on shallow groundwater characteristics as catchment area in the research site should be conducted. The characteristics of shallow groundwater resources being investigated in this study included the condition and the distribution of groundwater depth, groundwater flow direction, and groundwater electrical conductivity. The primary data were collected on excavation wells of which locationswere determined using systematic random sampling method, by means of making imaginary grids, measuring to 2 km x 2 km. the primary data collected included coordinate data, groundwater depth data, the site’s altitude, and the groundwater conductivity data. The samples of groundwater electrical conductivity were determined by cluster sampling method, based on the groundwater depth area. The data analysis results demonstrate that shallow groundwater resource in the research site has the following characteristics: the groundwater depth is mostly less than 5 meter, the groundwater flows to the south of the research site, the electric conductivity of the research area has various values, i.e. 187 microS/ cm of the lowest value, and 368 microS/ cm of the highest value. Keywords: Cangkringan District, shallow groundwater, groundwater depth, groundwater flow, groundwater electrical conductivity.
The Impact of Rapid Urban Growth on Potential Groundwater Pollution in Ngemplak Sub-District, Sleman District Rivi Neritarani; Sadewa Purba Sejati
Jurnal Wilayah dan Lingkungan Vol 9, No 2 (2021): August 2021
Publisher : Department of Urban and Regional Planning, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jwl.9.2.198-212

Abstract

Ngemplak Sub-District is one of the administrative regions in Sleman Regency which has experienced quite intensive urban development. Based on several studies, this region experienced a fairly rapid change in landuse. This landuse changes has resulted in pressure on the natural resources in this region, especially water resources. The study aims to develop a strategy to maintain the sustainable function of land resources in the midst of massive land changes in Ngemplak Sub-District. This research uses landuse comparative method at two different times to identify rapid urban growth. Whereas to identify potential groundwater pollution, this research uses the GOD method which is use three parameters, they are groundwater occurrence (G), overall aquifer class (O), and depth to water table (D). Based on the results of data processing, there was an increase in built-up area in Ngemplak Sub-District from 2006 to 2015 amounting to 235. 58 hectares. This increase in built-up area is a trigger factor for the emergence of environmental problems, namely the exploitation of water resources found in this region. Based on the results of data processing using the GOD method, the overall potential groundwater pollution in the Ngemplak Sub-District is included in the extreme class.
Potensi pencemaran air tanah bebas pada sebagian kawasan resapan air di Lereng Selatan Gunungapi Merapi Sadewa Purba Sejati
Jurnal Pendidikan Geografi: Kajian, Teori, dan Praktek dalam Bidang Pendidikan dan Ilmu Geografi Vol 25, No 1 (2020)
Publisher : Universitas Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17977/um017v25i12020p025

Abstract

Decreasing quality of unconfined groundwater is one of the impacts which may occur as increasing number ofpopulation as a consequence of the development in a part of primary water infiltration. Study about the potential of unconfined groundwater pollution needs to be conducted as an alternative for monitoring water quality.  Based on GOD method, all confined groundwater areas in the research location is in the high potential of pollution. The condition occurs because the natural factors in the form of aquifer, aeration zone constituent material, and the depth of groundwater have the potential to facilitate interaction between pollutants or pollutant sources with the unconfined groundwater. Variation of groundwater pollution is obtained by developing GOD method, which is by adding a modifier parameter in the form of population density. Development of GOD method results in two classes of the potential of unconfined groundwater pollution, namely the potential for low pollution with an area coverage of 30.6% of the total area of the study area, and the potential for high groundwater pollution with an area coverage of 69.4%.Penurunan kualitas air tanah bebas merupakan salah satu dampak yang dikhawatirkan akan muncul seiring dengan meningkatnya kepadatan penduduk sebagai konsekuensi dari pesatnya pembangunan yang terjadi pada sebagain kawasan resapan air primer. Kajian mengenai potensi pencemaran air tanah bebas perlu dilakukan sebagai alternatif pematauan kualitas air. Berdasarkan metode GOD, seluruh air tanah bebas di daerah penelitian berada dalam potensi pencemaran sangat tinggi. Keadaan tersebut terjadi karena faktor keadaan alami berupa jenis akuifer, material penyusun zona aerasi, dan kedalaman muka air tanah berpotensi mempermudah interaksi antara polutan atau sumber pencemar dengan air tanah bebas. Variasi potensi pencemaran air tanah diperoleh dengan mengembangkan metode GOD, yaitu menambahkan parameter modifikator yang berupa kepadatan penduduk. Pengembangan metode GOD tersebut menghasilkan dua kelas potensi pencemaran air tanah bebas, yaitu potensi pencemaran rendah dengan cakupan wilayah sebesar 30,6% dari keseluruhan luas daerah penelitian, dan potensi pencemaran air tanah tinggi dengan cakupan wilayah  sebesar 69,4%.
Implementasi Sistem Informasi Geografis Berbasis Web dalam Penyusunan Profil Kependudukan Sadewa Purba Sejati
Dinamisia : Jurnal Pengabdian Kepada Masyarakat Vol. 6 No. 1 (2022): Dinamisia: Jurnal Pengabdian Kepada Masyarakat
Publisher : Universitas Lancang Kuning

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31849/dinamisia.v6i1.4746

Abstract

The Covid-19 pandemic has an impact on the economic and social sectors in RT 08 Kertodadi, Pakembinangun Village, Pakem District, Sleman Regency, Yogyakarta Special Region Province. The provision of population data as a complete document for applying for social assistance has been carried out by the government at the neighborhood level, but the available data is still conventional. The availability of conventional population data is caused by the lack of briefing on the use of information technology as a digital population data inventory tool. Efforts are being made to overcome the problem by providing training and assistance in the preparation of a digital population profile. The basic science used in this activity is a geographic information system (GIS) which is used as the basis of knowledge in a digital population data inventory. The end result of this activity is a digital-based population profile with spatial and regional values ​​that can be used to make an inventory of population dynamics quickly, easily, and transparently.
Peningkatan Pengetahuan tentang Pembangunan Berkelanjutan Menggunakan Media Cerita Bergambar di Tingkat Sekolah Dasar Yoga Suharman; Sadewa Purba Sejati; Dimas Adi Pratama
Dinamisia : Jurnal Pengabdian Kepada Masyarakat Vol. 5 No. 5 (2021): Dinamisia: Jurnal Pengabdian Kepada Masyarakat
Publisher : Universitas Lancang Kuning

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31849/dinamisia.v5i5.5298

Abstract

This community service entitled Enhancement Knowledge of Sustainable Development with Pictorial Story at Elementary School was carried out to strengthen the knowledge capacity and attitude related to groundwater resources in Bronggang Baru, Cangkringan District, Sleman, Yogyakarta. The method of implementing community service was conducted by three steps, consist of 1) literature review and problem analysis, 2) interviews and analysis of partner needs, and 3) developing and delivering the media of pictorial story about sustainable development and its relation to groundwater. The result of the activity shows that 80% of the total 25 Siswa/i s who attended knew more about the insights of sustainable development, particularly regarding geographical conditions and water resources of local area.
Co-Authors Aditya Saputra Afrinia Lisditya Permatasari Permatasari Arif Novianto Dimas Adi Pratama Eva Putriany Fajrul Falah Ifnu Rifki Nurhidayanto Mohd Hairy Ibrahim Permatasari, Afrinia Lisditya Riski Edi Prayoga Rivi Neritarani Rivi Neritarani Septian Putri Antika Wahyu Dwi Setiawan Yoga Suharman