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"Pembangunan Yogyakarta International Airport mendorong pergeseran aktivitas maupun pertambahan aktivitas terhadap tanah-tanah yang berada di sekitarnya. Kawasan sekitar bandara akan ikut berkembang dan dimanfaatkan sebagai investasi terutama pada lahan yang mempunyai prospek dan menghasilkan keuntungan bagi berbagai pihak. Fenomena terjadinya perubahan harga tanah disekitar bandara tak dapat dihindari akibat tingginya permintaan terhadap tanah. Penelitian ini bertujuan untuk mengetahui perubahan harga tanah yang terjadi di Kabupaten Kulon Progo dengan adanya Yogyakarta International Airport serta faktor lainnya yang mempengaruhi perubahan harga tanahnya. Metode yang digunakan penelitian adalah deskriptif komparatif dengan membandingkan sebelum dan setelah dibangunnya bandara. Diketahui pada klasifikasi jarak kelas jarak dekat, perubahan harga tanah didominasi oleh kelas perubahan harga tanah yang tinggi. Harga tanah disekitar bandara sangat tinggi kemudian menurun seiring menjauhnya jarak terhadap bandara namun akan meningkat kembali pada saat mendekati pusat-pusat kegiatan. Selain jarak terhadap pusat-pusat kegiatan, harga tanah dipengaruhi oleh jenis penggunaan tanah dan aksesibilitas dari tanah itu sendiri.

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The development of Yogyakarta International Airport making a shift in activities and increased activity to the it surrounding. The area around the airport will be developed and will be use as an investment, especially in land that has prospects and generates profits for various parties. The phenomenon of land price changes around the airport is inevitable due to high demand for land. This study aims to find out the changes in land prices that occur in Kulon Progo Regency with the presence of Yogyakarta International Airport and other factors that influence the change in land prices. The method used by the research is comparative descriptive by comparing before and after the construction of the airport. In the classification of near distances classification, land price changes are dominated by high classification. Land prices around the airport are very high then decrease as the distance away from the airport but will increase again when approaching another centers area. In addition to the distance to the centers of activity, the price of land is affected by the type of land use and accessibility.

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"Gunung Endut merupakan salah satu daerah dengan potensi panas bumi kualitas baik mencapai 80 Mwe. Kegiatan pengembangan panas bumi di daerah Gunung Endut telah menentukan lokasi titik pembangunan tapak sumur pembangkit panas bumi, salah satunya adalah lapangan EDT C. Pembangunan tapak sumur ini diperlukan penelitian lebih lanjut terhadap kondisi geologi teknik untuk mengetahui karakteristik tanah. Penelitian ini bertujuan untuk mengetahui karakteristik geologi teknik dan memetakan kondisi geologi teknik daerah penelitian. Metode yang digunakan adalah metode lapangan dan metode laboratorium. Metode lapangan dilakukan untuk mendapatkan informasi di lapangan seperti tingkat pelapukan dan pengambilan sampel tanah. Metode laboratorium terdiri atas uji analisis ukuran butir, uji batas Atterberg, dan uji kuat geser langsung untuk memperoleh data terkait karakteristik geologi teknik. Hasil lapangan menunjukkan satuan geomorfologi terdiri atas dua satuan, yaitu Satuan Perbukitan Tinggi Vulkanik Berlereng Curam – Sangat Curam dan Satuan Perbukitan Tinggi Vulkanik Berlereng Landai – Curam. Hasil laboratorium menunjukkan bahwa pada uji berat kering memiliki berat air = 294.68 – 373.49 gr dengan persentase kadar air (Wn) = 42 – 60%. Untuk uji ukuran butir menunjukkan pasir berbutir kasar dengan nilai fraksi butiran > 2 mm = 2 – 18%, fraksi pasir kasar = 67 – 80%, fraksi pasir halus = 9 – 16%, dan fraksi lanau = 3 – 4%. Hasil batas Atterberg menunjukkan nilai batas cair (LL) = 48 – 64%, batas plastis (PL) = 39 – 46%, indeks plastisitas (PI) = 6 – 19%, indeks cair (LI) = 0.21 – 2.52%, dan aktivitas (A) = 1.346 – 5.450. Hasil uji kuat geser langsung menunjukkan nilai sudut geser dalam (∅) = 9.62 – 44.95˚ dan nilai kohesi (c) = 0.0443 – 5.6750 kN/m2 . Kemudian diperoleh satuan geologi teknik diantaranya Satuan Batuan Andesit Lapuk Ringan – Kuat, Satuan Tuff Lapuk Sempurna, Satuan Pasir Gradasi Baik (SW), dan Satuan Kolovium Lapuk Kuat – Sempurna. Pembangunan tapak sumur dapat memperhatikan desain lubang sumur, akses jalan, relief tinggi dan curam, dan hasil pengujian laboratorium.

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Mount Endut is a geothermal potentials area in Indonesia with good quality reaching 80 Mwe so that it can meet the electrical energy needs of Java Island. Geothermal development activities in the Mount Endut area are in the stage of determining the location of the Wellpad Geothermal construction point, one of which is the EDT C Field. Construction of the Geothermal Wellpad requires further research on engineering geology conditions to determine soil characteristics so that construction can last longer. For this reason, this study aims to determine the engineering geology characteristics and map the geological conditions of the research area. The methods used in the study are field methods and laboratory methods. Field methods are carried out to obtain the weathering level and soil sampling. Laboratory methods are divided into grain size analysis tests, Atterberg Limit, and direct shear strength tests to obtain engineering geology characteristics. Field results show that the geomorphological unit consists of two units, the Steep – Very Steep Marbled Volcanic High Hill Unit and the Ramps – Steep Marbled Volcanic High Hill Unit. The laboratory results showed that the dry weight test had a water weight = 294.68 – 373.49 gr with a percentage of water content (Wn) = 42 – 60%. For the grain size test shows the value of the grain fraction > 2 mm = 2 – 18%, the coarse sand fraction = 67 – 80%, the fine sand fraction = 9 – 16%, and the silt fraction = 3 – 4%. The Atterberg limit results show the value of the liquid limit (LL) = 48 – 64%, the plastic limit (PL) = 39 – 46%, the plasticity index (PI) = 6 – 19%, the liquid index (LI) = 0.21 – 2.52%, and the activity (A) = 1.346 – 5.450. Direct shear strength test show the value of the inner shear angle (∅) = 9.62 – 44.95˚ and the cohesion value (c) = 0.0443 – 5.6750 kN/m2 . Then obtained engineering geology units including Lightly Weathered – Strong Andesite Rock Units, Perfectly Weathered Tuff Units, Good Gradation Sand Units (SW), and Strong – Perfectly Weathered Collovium Units. The construction of wellpad geothermal can take can take into account the design of the wellbore, road access, high and steep relief, and the results of laboratory tests."

"Wilayah Kerja Panas Bumi (WKP) Gunung Endut memiliki luas 25.870,0 Ha dengan potensi spekulatif mencapai 100 Mwe dan cadangan terduga 80 MWe (Kementerian ESDM,2017). Namun, hingga saat ini belum tedapat investor yang tertarik untuk memproduksi WKP Gunung Endut karena risikonya yang masih tinggi. Risiko tersebut adalah belum adanya kepastian perihal sumber panas bumi pada lokasi tersebut. Pemerintah berupaya dengan melakukan pengeboran sumur eksplorasi menggunakan dana dari pemerintah. Hal ini bertujuan untuk mendapatkan data dan informasi secara lengkap. Meskipun demikian, dalam menentukan area untuk dibangun wellpad, diperlukan beberapa data pendukung. Salah data pendukung untuk membangun wellpad adalah informasi geologi teknik untuk mengetahui area sekitar wellpad. Untuk itu dilakukan pemetaan geologi teknik pada area tersebut. Metode yang dilakukan adalah pemetaan geologi teknik dan uji mekanika tanah. Pemetaan geologi teknik meliputi tingkat pelapukan, kemiringan lereng, litologi, dan kekuatan batuan. Sedangkan uji mekanika tanah terdiri dari uji batas cair,batas plastis, indeks aktivitas, schimdt hammer, uji kuat geser, dan klasifikasi tanah. Daerah penelitian terdiri dari 4 satuan geologi teknik yaitu satuan andesit lapuk sempurna, satuan tuf sangat lapuk-lapuk sempurna, satuan tanah pasir bergradasi buruk (SP), dan satuan tanah pasir bergradasi baik (SW). Berdasarkan uji mekanika tanah yang dilakukan pada daerah penelitian memiliki nilai kadar air 25%-41%, memiliki nilai batas cair (LL) 49.53% - 58.49%, memiliki nilai batas plastis (PL) 38.64% - 47.412%, memiliki nilai indeks plastisitas (PI) 6.38% - 11.61%. Berdasarkan analisis indeks aktivitas didapatkan nilai aktivitas sebesar 0.77 – 5.28. Memiliki nilai kohesi (c) 8.38 - 12.278, dan nilai sudut gesek dalam (ɸ) sebesar 3.7027 – 4.8261. Spesifikasi wellpad yang akan dibangun tidak diketahui, sehingga digunakan faktor keamanan sebesar 2.5, sehingga didapatkan daya dukung tanah yang dizinkan untuk dibangun wellpad pada daerah penelitian adalah sebesar 3.4-5.5 ton/m2 dengan rata-rata 4.55 ton/m2.

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The Gunung Endut Geothermal Working Area (WKP) itself has an area of 25,870.0 Ha with a speculative potential of up to 100 Mwe and an estimated reserve of 80 MWe (Ministry of Energy and Mineral Resources, 2017). However, until now there has been no investor who is interested in producing the Gunung Endut WKP because the risk is still high. The risk is that there is no geothermal source in that location. The government is trying to drill exploration wells using government funds. It aims to obtain complete data and information. However, in determining the area to build a wellpad, some supporting data is needed. One of the supporting data for building a wellpad is engineering geological information to find out the area around the wellpad. For this reason, a geological engineering mapping of the area was carried out. The method used is engineering geology and soil mechanics test. Mapping of engineering geology includes the level of weathering, slope, lithology, and rock strength. While the soil mechanics test consists of a liquid limit test, plastic limit, activity index, Schimdt hammer, shear strength test, and soil classification. The research area consists of 4 engineering geology units, namely the Perfectly Weathered Andesite Unit, Highly Weathered-Perfectly Weathered Tuff Unit, Poor Graded Sand Soil Unit (SP), and Well Graded Sand Soil Unit (SW). Based on soil mechanics tests conducted in the research area, it has a moisture content value of 25%-41%, has a liquid limit value (LL) of 49.53% - 58.49%, has a plastic limit value (PL) of 38.64% - 47.412% , has a plasticity index (PI) of 6.38% - 11.61%. Based on the activity index analysis, the activity value is 0.77 – 5.28. It has a cohesion value (c) of 8.38 - 12,278, and an internal friction angle (ɸ) of 3.7027 – 4.8261. The specifications for the wellpad to be built are unknown, so a safety factor of 2.5 is used, so that the soil bearing capacity allowed for the construction of the wellpad in the research area is 3.4-5.5 tons/m2 with an average of 4.55 tons/m2."

"Gunung Endut memiliki potensi cadangan terduga sebagai pembangkit listrik tenaga panas bumi sebesar 80 MWe. Informasi geologi teknik seperti mekanika tanah, litologi batuan, tingkat pelapukan batuan, kekuatan batuan, serta kemiringan lereng menjadi hal yang fundamental dalam menentukan lokasi wellpad. Hal tersebut mendasari penelitian karakteristik geologi teknik perlu dilakukan untuk kepentingan penentuan titik wellpad. Metode penelitian berupa pemetaan geologi teknik dan uji laboratorium mekanika tanah. Dalam melakukan uji mekanika tanah, digunakan sampel tanah terganggu yang diambil menggunakan sekop. Hasil pemetaan geologi teknik menunjukkan daerah penelitian tersusun atas lima satuan geologi teknik, yaitu satuan tanah residual SP (RSP), tanah residual SW (RSW), andesit lapuk sedang (AM), andesit sangat lapuk (AH), dan tuf lapuk sempurna. Berdasarkan tingkat pelapukan, daerah penelitian terbagi menjadi tiga zona pelapukan, yaitu zona batuan lapuk tinggi (level 4), zona batuan lapuk sempurna (level 5), dan zona tanah residu (level 6). Hasil analisis mekanika tanah menunjukkan nilai kadar air 29,62%- 40,89%, nilai batas cair (LL) 28,56%-48,17%, indeks plastisitas (PI) 1,49%- 17,96% dominan agak plastis, indeks aktivitas 0,3-1,55 (inactive hingga active clays) dominan normal clays, potensi swelling sedang, kohesi (c) 0,814-7,364 kPa, serta sudut geser dalam (ф) 2,51⁰-20,9⁰. Analisis kelayakan menunjukkan daerah penelitian layak dibangun wellpad dengan kriteria pondasi dengan kedalaman 3 m, berat tanah 1,8 t/m3 , lebar pondasi 5 m, serta faktor keamanan 2,5 dapat menopang wellpad dengan daya dukung rata-rata 12,16 ton/m2.

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Mount Endut has a potential reserve of 80 MWe as a geothermal power plant. Technical geological information such as soil mechanics, lithology, weathering level, rock strength, and slope are fundamental in determining the location of wellpad. This underlies the research on engineering geological characteristics that need to be carried out to determine the wellpad point. The research method is in the form of engineering geological mapping and soil mechanics laboratory tests. In carrying out soil mechanics tests, disturbed soil samples were used which were taken using a shovel. The result of the engineering geological mapping show that the research area is composed of five engineering geological units, namely residual soil unit SP (RSP), residual soil SW (RSW), moderately weathered andesite (AM), highly weathered andesite (AH), and completely weathered tuff. Based on the level of weathering, the study area is divided into three weathering zones, namely the highly weathered rock zone (level 4), the completely weathered rock zone (level 5), and the residual soil zone (level 6). The results of the soil mechanics analysis show that the water content value is 29.62%-40.89%, the liquid limit value (LL) is 28.56%-48.17%, and the plasticity index (PI) 1.49%-17.96% is slightly dominant. plastic, activation index 0.3-1.55 (inactive to active clays) dominant normal clays, moderate swelling potential, cohesion (c) 0.814-7.364 kPa, and internal shear angle (ф) 2.51⁰-20.9⁰. The feasibility analysis shows that the research area is feasible to build a wellpad with the criteria of a foundation with a depth of 3 m, soil weight of 1,8 t/m3 , a foundation width of 5 m, and a safety factor of 2.5 that can support a wellpad with an average carrying capacity of 12,16 tons/ m2."

"This research was conducted by the problem of population differences bintangur in SeiTembesi and Bukit Tiban Protected Forest allegedly influenced by macro nutrient content inthe soil. The study was conducted using a survey method. Samples were taken bypurposive by following along a 100 m transect lines that divide the contour lines. Transectwere initiated at least 50 m from the edge of the forest that are placed propossionally andprioritized on location around bintangur population. Soil sampling conducted on the soilsurface of ± 5 cm to a depth of ± 25 cm from the soil surface. Based on the research thatthere are differences in soil organic matter content in the protected forest and macro nutrientin the soil. Soil pH is at the same relativity value, but that value is an extreme value whencompared with the value according to criteria of Soil Chemical Properties. This soilconditions is able to inhibit the growth of bintangur. Bintangur population in both of theprotected forest can be maintained through soil conservation biological.Penelitian ini dilatarbelakangi oleh permasalahan perbedaan populasi bintangur di HutanLindung Sei Tembesi dan Bukit Tiban yang diduga dipengaruhi oleh kandungan hara makrodi dalam tanah. Penelitian dilakukan menggunakan metode survei. Sampel diambil dengancara purposive dengan mengikuti jalur transek sepanjang 100 m yang membelah gariskontur. Jalur transek tersebut dimulai minimal 50 m dari tepi hutan yang ditempatkan secaraproporsional dan diprioritaskan pada lokasi sekitar populasi bintangur. Pengambilan sampeltanah dilakukan pada permukaan tanah ± 5 cm pada kedalaman ± 25 cm dari permukaantanah. Berdasarkan hasil penelitian diperoleh informasi bahwa terdapat perbedaankandungan bahan organik tanah di kedua hutan lindung tersebut dan kandungan haramakro di dalam tanah. pH tanah berada pada nilai yang relatif sama, namun nilai tersebutmerupakan nilai yang ekstrim bila dibandingkan dengan Kriteria Penilaian Sifat KimiaTanah. Kondisi tanah seperti itu mampu menghambat pertumbuhan bintangur. Populasibintangur di kedua hutan lindung tersebut dapat dipertahankan melalui konservasi tanahsecara biologi."

"Waduk Gajah Mungkur merupakan bendungan dari sungai Bengawan Solo. telah mengalami sedimentasi yang bersumber dari daerah tangkapan waduk Gajah Mungkur. Fenomena degradasi tanah yang terjadi jika 'flax ' Jger diatasi, maka akan menimbulkan berkurangnya usia Waduk Gajah Mungkur. ual tersebut disebabkan karena daerah tangkapan air (catchmant area) waduk umumnya memiliki Wilayah yang berlereng terjal dan berbukit-bukit. Oleh karena itu perlu penanganan lebih lanjut, salah satunya dengan cara mengetahui Wilayah-Wilayah yang prioritas untuk dilakukan konservasi tanah. Penelitian ini bertujuan untuk mengetahui Wilayah prioritas konservasi tanah kiasaran dan pada tingkat kekritisan tanah menggunakan metode pembobotan dengan variabel yaitu erosi, vcetasi dan kelerengan. Nilai erosi didapat dengan menggunakanakan metode USLE (Universal Soil Loss Equation). Wilayah prioritas konservasi tanah di Daerah Tangkapan Waduk terdapat empat sekala pr writas dia taranya prioritas I hingga III dan tidal; prioritas. Prioritas I terdapat Sub WAS AI ng Unggahan, Sub DAS Keduang, Sub DAS Solo Hulu, Sub DAS Temon, Su., DAS Wiromoko, Sub DAS Wuryantoro, sedangkan pada Wilayah d ngan prioritas II terdapat pada Sub DAS Alang Unggahan, Sub DAS Solo Hulu dan Sub DAS Wiromoko. Dan prioritas III terdapat pada selurh. Wilayah penelitian, kecuali pada Sub DAS Temon dan Wuryantoro.

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Gajah Mungkur reseivoir is dam of Bengawan S010 river which is gt through sedimentation from the Gajah Mungkur catchment area. In case. land degradation that occurs in Gajah Mungkur resevoir must to solved, because it will cause a reduction in age of Gajah Mungkur reservoir. This phenomuon it mused by topographic characteristics of Gajah Munglalr catchm' nt al fa. Cousequently this phenomenon needs to have further handling, one of ther. is know the priority area of soil conservation. The aim of this research is to know the priority area of soil conservation based on soil critical level by using scoring method with erosion. vegetation and slope variable. The value of fusion is obtained by using USLE's method. There are four classification of priority in Gajah Mungkur catchment area. First priority are found if Alang Unggahan Watershed, Keduang Watershed, Solo Hulu Watershed, Term waerslied. W iromoko watershed, Wuryantoro Watershed. Second piority are iound in Alang Unggahan Watershed, Solo Hulu watershed and Wironoko Wat rshed. Third priority are found in the Whole of reseach area, except in Teon watershed and Wuryantoro Watershed."

"This research aims to study the effect of lime addition in acid soil to chemical characteristic of soil and dry weight of green manure crops. The experiment with completely randomized design for factional 7x2 was used. The first factor was green manure crops consisting of seven level and the second factor was lime addition consisting of two levels. Result shows that the liming can increase pH value from very acid to slightly acid, decrease Al-dd content, decrease Al saturation."

"Pulau Ambon termasuk dari salah satu pulau yang berada di Kepulauan Maluku dan secara fisiografis merupakan bagian dari Busur Banda yang memiliki kompleksitas tektonik akibat pertemuan tiga lempeng aktif. Akibatnya Pulau Ambon juga memiliki kondisi geologi regional yang menunjukkan banyaknya jenis batuan beku. Penelitian ini dilakukan untuk mengetahui karakteristik geokimia batuan serta kandungan unsur logam tanah jarang yang terdapat pada batuan tersebut. Metode yang digunakan untuk penelitian ini adalah analisis petrografi dan analisis XRF (X-Ray Fluoresence). Berdasarkan data petrografi dan geokimia dari 10 sampel batuan, digunakan batuan beku yang tersebar di Pulau Ambon pada tiga jenis yang dominan, yaitu batuan peridotit, batuan ambonit, dan batuan granitoid. Batuan peridotit Ambon terdiri atas lherzolit yang didominasi oleh mineral olivin dan piroksen serta terdapat ubahan mineral menjadi serpentin. Batuan peridotit termasuk seri magma basal tholeiitik dengan lingkungan tektonik island arc. Batuan ambonit terdiri atas dasit yang didominasi oleh mineral plagioklas, kuarsa, dan hornblenda, serta dicirikan terdapat kordierit. Batuan ambonit termasuk seri magma calc-alkaline dengan lingkungan tektonik continental arc. Batuan granitoid terdiri atas syenogranit yang didominasi oleh mineral kuarsa, plagioklas, dan alkali feldspar serta terdapat mineral pembawa LTJ berupa apatit, monasit, dan zirkon. Batuan granitoid Ambon termasuk seri magma calc-alkaline dengan lingkungan tektonik continental arc. Hasil data XRF menunjukkan bahwa terdapat kandungan unsur logam tanah jarang pada sampel batuan beku Pulau Ambon berupa yttrium (Y), europium (Eu), praseodymium (Pr), dan ytterbium (Yb). Unsur LTJ ini dapat dikaitkan dengan karakteristik geokimia batuan untuk menentukan lingkungan tektoniknya.

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Ambon Island is one of the islands located in the Maluku Islands and physiographically, it is part of the Banda Arc, which has a complex tectonic setting due to the convergence of three active plates. Consequently, Ambon Island also has a regional geological condition that exhibits a variety of igneous rocks. This study was conducted to determine the geochemical characteristics of the rocks and the content of rare earth elements in these rocks. The methods used for this research include petrographic analysis and XRF (X-Ray Fluorescence) analysis. Based on petrographic and geochemical data from 10 rock samples, igneous rocks distributed on Ambon Island are classified into three types: peridotite, ambonite, and granitoid. Ambon peridotite consists of lherzolite, which is dominated by olivine and pyroxene minerals, with some alteration to serpentine. Ambon peridotite rocks are part of the tholeiitic basalt magma series with an island arc tectonic setting. Ambonite rocks consist of dacite, dominated by plagioclase, quartz, and hornblende minerals, and are characterized by the presence of cordierite. Ambonite is part of the calc-alkaline magma series with a continental arc tectonic setting. Granitoid rocks consist of syenogranite dominated by quartz, plagioclase, and alkali feldspar, and contain rare earth element-bearing minerals such as apatite, monazite, and zircon. Granitoid rocks in Ambon belong to the calc-alkaline magma series with a continental arc tectonic setting. XRF data indicate that the igneous rock samples from Ambon Island contain rare earth elements such as yttrium (Y), europium (Eu), praseodymium (Pr), and ytterbium (Yb). These rare earth elements can be associated with the geochemical characteristics of the rocks to determine their tectonic environment."