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Jurnal Geografi : Media Informasi Pengembangan dan Profesi Kegeografian
Published by Universitas Negeri Semarang
ISSN : 25493078     EISSN : 25493094     DOI : -
Core Subject : Science,
Earth & Planetary Sciences
Jurnal Geografi : Media Informasi Pengembangan dan Profesi Kegeografian welcomes high-quality, original and well-written manuscripts on any of the following topics: 1. Geomorphology 2. Climatology 3. Biogeography 4. Soils Geography 5. Population Geography 6. Behavioral Geography 7. Economic Geography 8. Political Geography 9. Historical Geography 10. Geographic Information Systems 11. Cartography 12. Quantification Methods in Geography 13. Remote Sensing 14. Regional development and planning 15. Disaster
Arjuna Subject : -
Articles 555 Documents
 32   33   34   35   36 
Distribution Sediment Fire Coal Power Plant Batang Cental Java Krisna, Candra Nardo
Jurnal Geografi : Media Informasi Pengembangan dan Profesi Kegeografian Vol 18, No 2 (2021): In progress [July 2021]
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jg.v18i2.30763

Abstract

Pltu Batang or central java project power plant (CJPP) is a critical coal fire power plant with 2x1000 MW capacity in Batang regency, Central java. Construction of  apower plant in Batang regency is expected to be able to supply house hold and industrial electricity in Central java. The role of power plant is very important there fore the sediment distribution in this area must be considered in order to maintain smooth operation of the power plants activities. The studies of sediment distribution in this case study used discriptive methods, descriptive methode are methods research to create a description of a situation or event researched and studied in a limited time and in a certain place to get a overview of the situation and conditions study area. Observations of oceanographic parameter such as wind, sea floor topography, and current which a natural symptoms interrelated in the process of erosion and sedimentation, to get basic information sediment distribution and to determine how much impact the current on the basic sediment distribution fire coal power plant batang. Type tidal in this research semi diurnal tide, mean sea level value 60.014 Cm using admilarty calculation, average thickness sediment on December – February 2017 13.588 CM, average thickness sediment on March – May 2017 6.026 CM, average thickness on June – August 2017 8.783 Cm. Average thickness Sept – Nov 2017 1.217 Cm
Analisis Hujan Es di Kabupaten Ngawi Berdasarkan Citra Satelit Himawari-8 dan Data Reanalisis Copernicus ECMWF Diniyati, Estri; Syofyan, Dhiyaul Qalbi; Mulya, Aditya
Jurnal Geografi : Media Informasi Pengembangan dan Profesi Kegeografian Vol 18, No 2 (2021): In progress [July 2021]
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jg.v18i2.28010

Abstract

Fenomena hujan es merupakan fenomena cuaca ekstrem yang merugikan manusia. Pada tanggal 11 November 2019 lalu, terjadi hujan es di Kabupaten Ngawi  dimana hujan es mengguyur hingga Kabupaten Blora dan Kabupaten Bojonegoro, sehingga kerugian yang ditafsir lebih tinggi. Penelitian ini bertujuan untuk menganalisis kondisi atmosfer dan lautan sebelum hingga saat kejadian hujan es sehingga kedepannya dapat digunakan dalam menganalisis dan memberikan peringatan kepada masyarakat agar dapat mengantisipasi terjadinya kerugian yang lebih besar. Dalam penelitian ini menggunakan metode analisis dengan data citra satelit Himawari-8 yang diolah dengan aplikasi SATAID serta analisis data reanalisis Copernicus ECMWF yang diolah dengan aplikasi GrADS. Hasil penelitian menunjukkan pada saat hujan es terdapat belokan angin disekitar wilayah Ngawi serta suhu muka air laut yang hangat di sebelah Utara Perairan Pulau Jawa. Hal ini mendukung adanya pertumbuhan awan konvektif yang dibuktikan dengan adanya kelembapan udara yang tinggi, kondisi atmosfer yang tidak stabil dan terbentuknya awan jenis cumulonimbus.
Investigating the Role of Rainfall Variability on the Hydrological Response of Small Tropical Upland Watershed Nugroho Christanto; Junun Sartohadi; Anggri Setiawan; M Pramono Hadi; Victor Jetten; Dhruba Phika Shrestha
Jurnal Geografi : Media Informasi Pengembangan dan Profesi Kegeografian Vol 16, No 1 (2019)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jg.v16i1.9879

Abstract

Excessive soil losses found in many upper basins in Java which causing severe problem in the lowland areas due to extreme hydrological response. The objective of this research is to study the role of rainfall variability (spatial variability, intensity and duration) on the hydrological response of small tropical upland watershed. To run and test this scenario, a watershed with a good weather dataset and experience soil loss problem was selected. Therefore, Bompon Watershed were selected to perform the model. In order to investigate the hydrological response of different rainfall variability, LISEM was sed. Three scenarios of comparison were designed: different rainfall interpolation, different direction of rainfall movement, high intensity-short duration and low intensity-long duration rain. Initial moisture content (thetai) was found as the most sensitive variable for all indicators when all input variables value increased. When the input variables values decreased, thetai was found as the most sensitive variable for changing in total discharge, whereas saturated hydraulic conductivity (Ksat) was the most sensitive variable for changing in peak of discharge.
Dampak Siklon Tropis Savannah Terhadap Karakteristik Hidrogeokimia Aliran pada Mata Air Guntur, Kawasan Karst Gunungsewu Fajri Ramadhan; Indra Agus Riyanto; Ahmad Cahyadi; Muhammad Naufal; M Widyastuti; Tjahyo Nugroho Adji
Jurnal Geografi : Media Informasi Pengembangan dan Profesi Kegeografian Vol 18, No 2 (2021)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jg.v18i2.30293

Abstract

Tropical Cyclones often occur in Indonesia and have disastrous impacts. Until now, no research has focused on time series data related to groundwater discharge and chemistry due to tropical cyclones. Therefore, this study aims to analyze and compare the characteristics of the hourly time series, both discharge and chemistry of the Guntur karst springs. Guntur Spring was affected by the tropical cyclone of Savannah on March 17, 2019. The method used in this study consisted of two parts, namely the analysis of the discharge and chemistry of Guntur Spring. Discharge analysis was performed by correlation test with rain intensity. Chemical analysis was carried out using the Minister of Health Regulation No. 90 of 2002 and expert standards. Other chemical analyzes were performed using a triangular piper, rectangular piper, and stiff diagram of the parameters Na+, K+, Ca2+, Mg2+, SO42-, Cl-, and HCO3-. The results of the relationship between discharge and rain intensity are directly proportional and increase significantly during a cyclone. The results of analysis of the Guntur Springs during Tropical Cyclone Savannah, all parameters are in accordance with the quality standard. In addition, there was a reduction in ion content due to the dilution process of Ca2+, Mg2+, Cl-, HCO3-., DHL, and pH ions compared to non-cyclone, Beton Resurgence, and Gremeng Resurgence ions. The chemical results when the cyclone is different compared to non-cyclone, Gremeng Resurgence and Beton Resurgence with a characteristic decrease in ionic content.
Variasi dan Trend Suhu Udara Permukaan di Pulau Jawa Tahun 1990-2019 Suwignyo Prasetyo; Ulil Hidayat; Yosafat Donni Haryanto; Nelly Florida Riama
Jurnal Geografi : Media Informasi Pengembangan dan Profesi Kegeografian Vol 18, No 1 (2021)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jg.v18i1.27622

Abstract

Suhu udara permukaan (SUP) merupakan salah satu indikator penting dalam konteks terjadinya perubahan iklim. Penelitian ini bertujuan untuk mengkaji variasi temporal dan spasial beserta trend SUP di Pulau Jawa pada tahun 1990-2019. Data yang digunakan diperoleh dari observasi Badan Meteorologi Klimatologi dan Geofisika (BMKG) dan data pemodelan reanalisis (GHCN_CAMS, ERA-5, JRA-55, dan GISTEMP-v4). Data observasi BMKG diperoleh berdasarkan data bulanan dari stasiun BMKG yang tersebar di seluruh Pulau Jawa (16 stasiun). Hasilnya menunjukkan bahwa terjadi peningkatan SUP dalam 30 tahun sebesar 0,11-1,24℃. Variasi spasial menunjukkan bahwa daerah dengan SUP tertinggi terdapat di Pulau Jawa sebelah utara bagian timur dan terendah di dataran tinggi Pulau Jawa bagian barat. SUP di Pulau Jawa tertinggi terjadi pada periode bulan September-Oktober-November (SON) dan terendah pada periode bulan Juni-Juli-Agustus (JJA). Hasil uji statistik menggunakan metode Mann Kendall test dengan significance level 1% menunjukkan bahwa semua data observasi BMKG mengalami trend peningkatan kecuali untuk Banyuwangi. Trend peningkatan SUP per tahun berkisar antara 0,017-0,048℃. Hal ini menunjukkan bahwa perubahan iklim secara regional telah terjadi di Pulau Jawa selama 30 tahun terakhir berdasarkan trend perubahan SUP.
Anomali Perubahan Muka Air Tanah di Daerah Urban Nandra Eko Nugroho
Jurnal Geografi : Media Informasi Pengembangan dan Profesi Kegeografian Vol 16, No 1 (2019)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jg.v16i1.17107

Abstract

Dusun Karangwuni dan Dusun Kumpulrejo, Desa Caturtunggal, Kecamatan Depok, Kabupaten Sleman, DIY memiliki anomali penurunan muka airtanah yang dapat menjadi gambaran tingkat eksploitasi yang dilakukan baik oleh masyarakat melalui sumur gali ataupun dunia usaha seperti hotel, apartemen dan mall. Pengambilan airtanah melalui sumur-sumur akan mengakibatkan terjadinya lengkung penurunan muka airtanah (depression cone). Semakin besar laju pengambilan air tanah, semakin curam lengkung penurunan permukaan airtanah yang terjadi di sekitar sumur yang dipompa sampai tercapai keseimbangan baru, jika terjadi pengisian dari daerah resapan. Oleh karena itu prinsip efisiensi air perlu dilaksanakan dengan memanfaatkan air permukaan dan air tanah secara terpadu. Data muka airtanah didapatkan dengan menggunakan pengukuran sumur gali yang diperoleh dari 21 titik sumur di lapangan. Penggambaran peta muka air tanah dangkal dilakukan menggunakan software ArcGIS. Penggambaran kontur muka air tanah dibuat menggunakan software Surfer. Anomali perubahan muka airtanah di Dusun Karangwuni dan Dusun Kumpulrejo, Desa Caturtunggal, Kecamatan Depok, Kabupaten Sleman, Yogyakarta dihasilkan dari analisis perbandingan antara kontur muka air tanah normal dengan muka air tanah yang telah mengalami penurunan. Dari Hasil analisis tersebut ditemukan lengkung penurunan muka airtanah (depression cone) yang sangat jelas. Nilai kedalaman yang sebelumnya berkisar antara 5 – 6 meter turun menjadi 9 – 11 meter membentuk lengkungan yang semakin curam. Penurunan itu tersebar di hampir semua bangunan kos, bangunan hotel dan apartemen.AbstractKarangwuni Backwoods and Kumpulrejo Backwoods, Caturtunggal Village, Depok District, Sleman Regency, Yogyakarta Special Region have anomalous groundwater decrease that can be the reflection of exploitation conducted by the community through dug wells or business sector such as hotels, apartments and malls. Groundwater retrieval through wells will bring about the formation of groundwater depression cone. The greater the rate of groundwater retrieval, the steeper the curvature of the groundwater depression cone occurs around the well being pumped until a new equilibrium is reached, in case of suplied from the recharge area. Therefore the principle of water efficiency utilization needs to be implemented. Groundwater level data is obtained from 21 dug wells in the field. A shallow groundwater depiction is drawn using ArcGIS software. The distribution of groundwater contours is created using Surfer software. The anomaly of groundwater decrease in Karangwuni and Kumpulrejo Backwoods, Caturtunggal Village, Depok District, Sleman Regency, Yogyakarta is resulted from comparative analysis between the normal groundwater contour and the decreased groundwater level. From the results of the analysis, there is a very obvious curve of groundwater depression cone. The previous depth value ranges from 5 to 6 meters dropped to 9 - 11 meters forming a steeper curve. The decline was spread across all hotels and apartments.
Hydrology Modelling-Based Biopore Infiltration Holes (BIH) Determination as River Flood Disaster Mitigation in Sewu Village, Surakarta, Central Java, Indonesia Eka Wulan Safriani; Anisaa Nur Halimah; Yunus Aris Wibowo
Jurnal Geografi : Media Informasi Pengembangan dan Profesi Kegeografian Vol 17, No 1 (2020)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jg.v17i1.22377

Abstract

Sewu Village is annually experience by river flooding. The application of Biopore Infiltration Holes (BIH) is one of the measures to reduce river flood disaster risk. This research was aimed to determine the proper location of the BIH. Hydrology tools by using flow direction analysis was used to obtain the best place of BIH. It utilized Digital Elevation Model (DEM), existing landuse and morphology  analysis to know the river flooding prone area and to identify the potential flow direction of surface water (run off). The conformity of those data can be used as determination of BIH. Moreover, the number of BIH had been obtained from flow direction analysis where the lower ground elevation was the best place to arrange BIH. Overall, the flood disaster risk in Sewu Village can be potentially overcome by using BIH.
Water Shortage at Several Sub Watershed into Wonogiri DAM Ugro Hari Murtiono; Agus Wuryanta
Jurnal Geografi : Media Informasi Pengembangan dan Profesi Kegeografian Vol 16, No 2 (2019)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jg.v16i2.20830

Abstract

The study was conducted at several selected sub-watersheds (Temon, Wuryantoro, Alang, and Keduang Sub-watersheds) in Wonogiri District. These four sub-watersheds are main rivers whose outlets flow into Wonogiri Dam. The study calculated the water supply and water demand for various uses at four sub-watersheds. The Thornwaite and Mather method was used to estimate the water supply. The results indicated that: (1) The water supply of Temon Sub-watershed was 35,435,875 m3­­­­­ and the annual water demand was 51,053,247 m3­­­­­, therefore there was a deficit of 30,59 % per year; (2)  The water supply of Wuryantoro Sub-watershed was 17,788,417 m3­­­­­ and the water demand was 22,413,430 m3­­­­­ per year, therefore the deficit was 20.64% per year; (3) The water supply of Alang Sub-watershed  was 31,372,317 m3­­­­­ per year and the water demand was 69,566,500 m3­­­­­ per year, therefore the deficit was 54.90% per year; (4) The water supply of Keduang Sub-watershed was 438,527,889 m3­­­­­ and the water demand was 452,611,219 m3­­­­­ per year, thus, the deficit was 3.11%  per year; (5) those sub-watersheds need improvements especially effective water resources plans, water allocation and distribution based on the determined priority, e.g., retention basin, low evapotranspiration re-vegetation, well-managed infiltration, water resources protection, and water reservoir construction.
Pemanfaatan Wahana Unmanned Aerial Vehicle (UAV) dan GPS (Global Positioning System) untuk Analisis Tingkat Kerugian Material Penduduk pada Daerah Rawan Tanah Longsor Win Rivai; Fahrudin Hanafi
Jurnal Geografi : Media Informasi Pengembangan dan Profesi Kegeografian Vol 18, No 2 (2021)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jg.v18i2.30763

Abstract

Perumahan Trangkil Baru dan Trangkil Sejahtera merupakan suatu kawasan perumahan di wilayah Kelurahan Sukorejo, Kecamatan Gunungpati, Kota Semarang yang memiliki risiko bencana longsor. Tanah longsor menyebabkan banyak kerugian material bagi penduduk yang bertempat tinggal pada wilayah terdampak, sehingga dikahawatirkan peristiwa yang sama akan terjadi pada tahun-tahun yang akan datang oleh sebab itu diperlukan adanya analisis tingkat kerugian material penduduk akibat tanah longsor. Penelitian ini menggunakan wahana UAV dan GPS sebagai media pengumpulan data geospasial, kemudian dilakukan uji akurasi geometri, planimetrik dan atribut. Sedangkan tingkat kerugian material penduduk dihitung berdasarkan metode ECLAC, kerugian aset tetap dan opportunity cost. Tingkat akurasi yang diperoleh adalah sebesar 3,60 meter untuk nilai akurasi vertikal dan nilai akurasi horizontal adalah 1,33 meter. Tingkat kepercayaan yang didapat untuk akurasi atribut adalah 90% dan nilai akurasi planimetrik untuk luas adalah -8,3973 sedangkan untuk nilai akurasi jarak adalah 0,3819. Nilai kerugian untuk aset tetap pada tingkat kerusakan atau kehilangan 70% adalah senilai Rp147.875.000,00. Pendapatan yang hilang penduduk paling tinggi adalah yang bermata pencaharian sebagai pegawai swasta, dan kerugian infrastruktur yang paling tinggi adalah jenis rumah tinggal permanen.
Analisa Kapasitas Sungai Kaliyasa Cilacap Muchamad Arif Budiyanto; Choiri Amri
Jurnal Geografi : Media Informasi Pengembangan dan Profesi Kegeografian Vol 16, No 1 (2019)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jg.v16i1.9746

Abstract

Kaliyasa merupakan sungai buatan yang berada pada bentuk lahan asal marine yang terletak di Kabupaten Cilacap. Kondisi sungai dipengaruhi oleh adanya Intrusi air asin yang masuk dari bagian Hilir yaitu dari Sentolo Kawat dan juga dari daerah Tempat Pelelangan Ikan,  kemudian juga tidak kalah pentingnya dari bagian hulu yang masuk melalui Muara Kali Sabuk yang kemudian masuk ke Kaliyasa. Untuk menghindari banjir yang sering terjadi, perlu direncanakan pengendalian banjir dengan mengetahui kapasitas penampang eksisting Kaliyasa sehingga dapat mengurangi kerugian. Selain kapasitas sungai diperlukan juga untuk mengetahui kedalaman minimum untuk memperlancar lalu lintas pelayaran nelayan. Dengan melakukan simulasi menggunakan HEC-RAS dapat ketahui kapasitas penampang Kaliyasa. Dari hasil simulasi kondisi eksisting dengan banjir kala ulang banjir tertentu beberapa lokasi mengalami banjir sehingga perlu penanganan tanggul banjir. Namun dari penampang pemanjang tersebut terdapat penumpukan sedimen di hilir yang mengganggu aliran air untuk keluar dari sungai, dan pengedapan tersebut menggangu alur lalu lintas kapal pada ruas sungai tersebut. Maka dalam perencanaan Kaliyasa dilakukan pengerukan (normalisasi) yang akan mengembalikan alur sungai dan alur navigasi kapal.Kaliyasa is an artificial river that is in the form of land of marine origin located in Cilacap Regency. River conditions are affected by the presence of saltwater intrusion coming from the lower reaches, from Sentolo Kawat and the Fish Auction Area. To avoid frequent flooding, it is necessary to plan flood control by knowing Kaliyasa’s existing cross-sectional capacity so that it can reduce losses. In addition to the capacity of the river, it is also necessary to know the minimum depth to facilitate the fishermen’s shipping traffic. By simulating using HEC-RAS, we can know the Kaliyasa cross-sectional capacity. From the results of the simulation of the existing conditions with certain floods in certain floods, several locations experienced flooding, so it was necessary to handle the flood dike. However, from the longitudinal cross section there is a buildup of sediment in the downstream which disrupts the flow of water to get out of the river, and the sediment disturbs the flow of ship traffic on the river segment. So in the Kaliyasa planning dredging (normalization) will be carried out which will restore the river flow and the navigation path of the ship.

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