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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
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Pemetaan Daerah Rawan Banjir di Kota Ambon Menggunakan Sistim Informasi Geografis
Jurnal Geografi : Media Informasi Pengembangan dan Profesi Kegeografian Vol 19, No 2 (2022)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jg.v19i2.34240

Abstract

Bencana banjir terjadi hampir setiap tahun di Kota Ambon dan mengingat besarnya dampak dan jumlah korban yang dapat ditimbulkan maka pemetaan daerah rawan banjir merupakan dasar untuk memberikan informasi tentang strategi mitigasi risiko banjir. Penelitian ini bertujuan untuk menganalisis kawasan rawan banjir dan juga memprediksi kawasan permukiman yang berada di kawasan rawan banjir di Kota Ambon. Penelitian ini menggunakan metode Multicriteria Evaluation (MCE) bagi pengambil keputusan dalam menentukan bobot dan metode yang sesuai serta menggunakan Weighted Linear Combination (WLC) dalam menganalisis daerah rawan banjir. Hasil penelitian menunjukkan bahwa Kecamatan Teluk Ambon memiliki wilayah terluas pada setiap kelas kerawanan banjir di Kota Ambon dibandingkan dengan kecamatan lainnya, hal ini dikarenakan kecamatan tersebut merupakan yang terbesar di Kota Ambon. Sedangkan luas lahan pemukiman yang tersebar pada kawasan kelas kerawanan tinggi memiliki persentase luas paling besar yaitu 2.222,06 ha. Sebaran permukiman pada kelas kerawanan sedang seluas 2.214,67 ha yang tersebar di lima kecamatan di Kota Ambon. Sedangkan kawasan terbangun yang berada pada tingkat kerawanan sedang adalah 0,39 ha. Salah satu bentuk antisipasi dan mitigasi bencana banjir adalah dengan memperkirakan seberapa luas lahan terbangun pada kawasan rawan banjir untuk meminimalkan kerugian, baik korban jiwa maupun kerusakan fisik
Kajian Karakteristik Aliran Sungai Serang di AWLR Bendungan Kulonprogo Berdasarkan Pemodelan Hidrologi HEC-HMS
Jurnal Geografi : Media Informasi Pengembangan dan Profesi Kegeografian Vol 19, No 2 (2022)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jg.v19i2.33671

Abstract

HEC HMS merupakan salah satu aplikasi pemodelan yang dapat digunakan untuk memodelkan nilai limpasan harian maupun bulanan berdasarkan karakteristik DAS. Tujuan penelitian ini adalah 1) Mengkaji karakteristik fisik DAS Serang yang direpresentasikan oleh nilai curve number (CN) 2) Mengkaji karakteristik aliran yang berupa debit puncak, volume outflow, dan waktu puncak dari hidrograf banjir terukur dengan hasil pemodelan menggunakan  HEC-HMS. Nilai CN ditentukan menggunakan metode SCS-CN. Analisis hidrograf banjir dilakukan menggunakan HEC-HMS meliputi perhitungan presipitasi menggunakan gage weight, volume runoff menggunakan SCS CN, direct runoff menggunakan SCS-UH, dan baseflow menggunakan constant monthly. Hasil penelitian menunjukkan CN pada tahun 2019 memiliki nilai 83 pada kondisi AMC I. Hasil kalibrasi menunjukkan nilai objective function dengan metode Peak-Weighted RMS Error cukup baik yaitu sebesar 2.2% dengan selisih antara debit puncak simulasi dan observasi yang nilainya masing-masing adalah 21.2 m3/s dan 21.6 m3/s. Secara keseluruhan, hasil uji statistik validasi diketahui bahwa model HEC-HMS menghasilkan hidrograf model yang sangat baik dilihat dari nilai NSE, R2 dan PBIAS.HEC HMS is a modeling application that can be used to model daily and monthly runoff values based on watershed characteristics. The objectives of this study are 1) to examine the physical characteristics of the Serang watershed which is represented by the curve number (CN) 2) to examine the flow characteristics in the form of peak discharge, outflow volume, and peak time of the flood hydrograph measured by modeling results using HEC-HMS. The CN value is determined using the SCS-CN method. Flood hydrograph analysis was performed using HEC-HMS including calculation of precipitation using gage weight, volume runoff using SCS CN, direct runoff using SCS-UH, and baseflow using constant monthly. The results showed that CN in 2019 had a value of 83 under AMC I conditions. The calibration results showed that the objective function value with the Peak-Weighted RMS Error method was quite good, namely 2.2% with the difference between the simulation peak discharge and the observation, each of which was 21.2 m3. /s and 21.6 m3/s. Overall, the results of the statistical validation test show that the HEC-HMS model produces a very good hydrograph model seen from the NSE, R2 and PBIAS values.
Zonasi Bencana Abrasi Pantai Sappoang Kabupaten Polewali Mandar
Jurnal Geografi : Media Informasi Pengembangan dan Profesi Kegeografian Vol 19, No 2 (2022)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jg.v19i2.34486

Abstract

This research uses a formula approach. In formula has several variables. The variables in this research are tidal, ocean current speed and direction, wave height and wave period, type of geological structure of the coast and sediment grain size materials, the slope of the beach and coastline direction, wind speed and direction. The number of samples or observation points at 27, with interval distance every point is 200 m. The results of the research were analyzed in the waves of the type formula and determinants of abrasion and sedimentation. Sappoang Beach is one of the marine landforms are more specifically known as a land form bar (deposition of sand along the coast). Conditions beach located around the mouth of the river to the beach physical differences that are in the basin area (central coast), where the force of the waves, and the flow velocity at the beach slope basin area beaches have greater value when compared to the coastal areas near the mouth river. The results showed that there are three conditions in Sappoang Beach beaches of different areas of research currently conducted (the west wind), like sedimentation area, balanced and abraded. Abraded zone and sedimentation zone is more dominant than the beaches that are stable. This is more significant because at the time of measurement, the wind is blowing west wind, given the quantity of variables measuring the higher the coast, so the coastal zone is increasing abraded.
Analysis of Rice Field Drought Level in Pemalang Regency 2019 – 2021
Jurnal Geografi : Media Informasi Pengembangan dan Profesi Kegeografian Vol 19, No 2 (2022)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jg.v19i2.35290

Abstract

Pemalang is a district that has rice fields up to 36 thousand hectares and becomes a buffer area for rice commodity in Central Java and becomes a focus in maintaining availability and food reserves. However, Pemalang Regency is vulnerable to the threat of drought that often hits the Central Java region. Therefore, information is needed about rice field drought as a form of mitigation and supporting food security by the sustainable development goals (SDGs). The purpose of this research is to determine the level of rice fields' drought in the rainy and dry seasons from 2019 to 2021 and displays in the form of web gis that all circles can access. The data needed in this study include normalized difference vegetation index (NDVI) map, normalized difference water index (NDWI) map, land surface temperature (LST) map, hydrogeology map, land type map, and rice field map. The result of this study is the formation of a map of the drought level of rice fields in the Pemalang Regency divided into five classes, namely very low, low, medium, high, and very high. Ulujami and Belik are the sub-districts with the broadest moderate drought rate from the data processing. Then Ulujami, Watukumpul, and Belik are districts with the broadest area of high drought, and Randudongkal is a subdistrict with the broadest very high drought area.
Uji Ketelitian Data GNSS dengan Metode NTRIP terhadap Variasi Multipath di Lingkungan Universitas Negeri Semarang
Jurnal Geografi : Media Informasi Pengembangan dan Profesi Kegeografian Vol 19, No 2 (2022)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jg.v19i2.39094

Abstract

Pengukuran menggunakan GNSS sudah mulai dikembangkan di Indonesia. Multipath berpengaruh kepada hasil data yang dihasilkan dari pantulan sinyal dari satelit ke antena GNSS akan terganggu akibat adanya variasi multipath. Penelitian ini bertujuan untuk (1) Mengetahui kualitas data horizontal GNSS dengan kondisi multipath dikawasan UNNES. (2) Mengetahui tingkat ketelitian pengukuran GNSS metode NTRIP terhadap pengukuran terestris metode poligon terbuka terkoreksi sempurna dengan total station. Populasi keadaan variasi multipath meliputi bangunan dan vegetasi di lingkungan kampus UNNES. Sampel yang akan digunakan 37 titik (STA) Control Point dan 2 Benchmark. Pada hasil penelitian diketahui (1) Kualitas data dengan status fixed dapat diperoleh jika masking area yang digunakan 0º - 10º dengan variasi multipath rerata 47,91% untuk vegetasi, 25% untuk bangunan, dan 27,08% area terbuka. Dan data berstatus float dengan variasi multipath rerata 37,80% untuk vegetasi, 37,80% untuk bangunan, dan 24,40% area terbuka. (2) Ketelitian yang dihasilkan yaitu cukup bagus untuk metode fixed dan float, Regresi linier yang dihasilkan status autonomous membuat persebaran data koordinat X menjadi tidak normal dan koordinat Y menyebar normal. Saran dari penelitian ini adalah untuk mengontrol kualitas data dari hasil pengukuran GNSS metode NTRIP dapat dikombinasikan dengan hasil dari pengukuran Total Station metode poligon tertutup.  Dan penelitian selanjutnya dapat menggunakan kombinasi antara jaring kontrol horizontal dan jaring kontrol vertikal untuk mengetahui ketinggian dan kontur yang lebih akurat.Measurement using GNSS has begun to be developed in Indonesia. Multipath affects the results of data generated from the reflection of signals from satellites to GNSS antennas will be disturbed due to multipath variations. This study aims to (1) Determine the quality of GNSS horizontal data with multipath conditions in the UNNES area. (2) Knowing the level of accuracy of the NTRIP method GNSS measurement against the terrestrial measurement of the open polygon method is perfectly corrected by the total station. The population of multipath variations includes buildings and vegetation in the UNNES campus environment. The sample to be used is 37 (STA) Control Point and 2 Benchmarks. In the results of the study, it is known that (1) The quality of data with fixed status can be obtained if the masking area used is 0º - 10º with an average multipath variation of 47.91% for vegetation, 25% for buildings, and 27.08% for open areas. And the data is float status with an average multipath variation of 37.80% for vegetation, 37.80% for buildings, and 24.40% for open areas. (2) The resulting precision is good enough for fixed and float methods, The linear regression generated by the autonomous state makes the distribution of X coordinate data abnormal and the Y coordinate spreads normally. Suggestions regarding of the results from this study is to control the data quality of the GNSS measurement results of the NTRIP method can be combined with the results of the Total Station measurement of the closed polygon method.  And subsequent research can use the combination of horizontal control net and vertical control net to find out the height and contour more accurately.
Magnitude and Spatial Distribution of Bioecological Carrying Capacity in Sleman Regency
Jurnal Geografi : Media Informasi Pengembangan dan Profesi Kegeografian Vol 20, No 1 (2023)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jg.v20i1.39133

Abstract

The objectives of the research were (1) to analyze the value of the biocapacity and ecological footprint in Sleman Regency; (2) to measure and analyze the value and spatial distribution of bioecological carrying capacity in global hectare units (global hectare); and (3) formulating the direction of development and control of development based on the class of bioecological carrying capacity. The research was conducted using a quantitative approach through processing and analyzing secondary data from various sources. Secondary data that is processed is data at the village level. The determination of the bioecological carrying capacity is based on the calculation of the ecological footprint as a manifestation of the level of consumption that reflects the population’s needs, and biocapacity which is the embodiment of the aspect of land use in providing resources. Based on the current conditions and land use composition, the Sleman Regency area only has a biocapacity value or can only support each resident with a land area of 0.20 hectares global/person. On the other hand, the value of the ecological footprint or the level of need reaches 0.279 global hectares/person. Thus, the bioecological carrying capacity in Sleman Regency has a value of 0.87 or a deficit of 0.078 hectares globally per capita. That shows that the Sleman Regency area has experienced an overpopulation with current productivity and land use. The low carrying capacity of bioecology in Sleman Regency is also reflected in the fact that most villages are classified as having low carrying capacity, reaching 68%. However, many villages still have a high bioecological carrying capacity (1.2), especially in the northern and western parts of the Sleman Regency. The primary attention needs to be devoted to villages with a low bioecological carrying capacity, which is 58 villages. In these villages, the direction of development needs to be emphasized in controlling land use change and increasing productivity, limiting business scale, and controlling population growth rates.
Monitoring Shoreline Changes for Evaluation of Regional Spatial Plans Using Google Earth Engine in West Wawonii District
Jurnal Geografi : Media Informasi Pengembangan dan Profesi Kegeografian Vol 20, No 1 (2023)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jg.v20i1.36768

Abstract

Abrasi merupakan salah satu fenomena alam yang biasanya terjadi di wilayah pantai. Fenomena ini menjadi serius ketika terus mengalami tren penurunan dan mengganggu kawasan permukiman di pesisir pantai.  Kecamatan Wawonii Barat merupakan salah satu kecamatan yang wilayah pesisirnya mengalami abrasi dan akresi. Namun, kajian mengenai perubahan garis pantai belum dikaji berdasarkan Rencana Tata Ruang Wilayah. Tujuan penelitian ini ada untuk memantau, menganalisis serta mengevaluasi laju perubahan garis pantai sesuai rencana tata ruang wilayah Kecamatan Wawonii Barat yang tertuang dalam pola ruang Kabupaten Konawe Kepulauan tahun 2021-2040. Metode yang digunakan adalah metode kualitatif teknik Digital Shoreline Analysis System (DSAS) yang diintegrasikan dengan Google Earth Engine (GEE) untuk indentifikasi abrasi dan akresi. Analisis penyebab, dampak dan rekomendasi dilakukan secara deskriptif kualitatif. Overall Accuracy dan Kappa Coefficient dari semua peta masing-masing 0,93 dan 0,86. Garis pantai telah mundur hingga -10,58 m/tahun dengan kemunduruan tertinggi sebesar -264,2 m/tahun. Rekomendari yang diusulkan adalah mengevaluasi kembali RTRW khususnya terkait rencana sistem jaringan prasarana jalan dan kawasan ekosistem mangrove, membuat telud dan teluk pemecah gelombang pada kawasan pesisir yang berhubungan langsung dengan permukiman dan penanaman mangrove di sepanjang pesisir pantai.
Diyonumo Island Tourism Potential Using Geographic Information System Application in Gorontalo Utara Regency
Jurnal Geografi : Media Informasi Pengembangan dan Profesi Kegeografian Vol 20, No 1 (2023)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jg.v20i1.37097

Abstract

One of the new tourist objects in North Gorontalo Regency is Diyonumo Island and until now it has not been optimally developed both in terms of its feasibility as a tourist area. So it really needs intervention from both the government and the private sector to encourage tourism development in North Gorontalo Regency which is based on nature. But there is no information system that provides an overview of this tourism potential. So the researchers identified the tourism potential of Diyonumo Island using a geographic information system in North Gorontalo Regency. The method used in this study was SWOT integrated with a spatial approach to analyze each parameter, namely attractions, infrastructure and accessibility. Based on spatial mapping, Diyonumo Island tourism can be recommended as a strategic tourism area for Gorontalo Province. The results of the analysis show that Diyonumo Island has a percentage of 40% of tourist attractions that have the potential to be developed and become a supporting strategy to increase the number of tourist visits.
Evaluation of GSMaP Data for Extreme Rain Events and Causing Floods in East Kotawaringin
Jurnal Geografi : Media Informasi Pengembangan dan Profesi Kegeografian Vol 20, No 1 (2023)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jg.v20i1.40196

Abstract

On 12 May 2021, 12 August 2021, 6 September 2021 and 27 June 2022, extreme rain occured with an intensity of 58.85 mm/day, 101.3 mm/day, 124.4 mm/day and 176.8 mm/day respectively in East Kotawaringin. These phenomena occurred during the dry season and caused flooding, which is a rare condition during the dry season in East Kotawaringin. This study aims to evaluate extreme rainfall using GSMaP (Global Satellite Mapping of Precipitation) data, where analysis using GSMaP has never been done before in East Kotawaringin. These GSMaP data were processed and compared with the observation data from the Meteorological Station of H. Asan, East Kotawaringin. After that, the GSMaP rainfall results are verified using statistical methods, namely RMSE, correlation coefficient and bias. The verification results show that the bias gives underestimate results for all dates. In addition, the RMSE values on 12 May 2021, 12 August 2021, 6 September 2021 and 27 June 2022 are 10.83, 17.32, 12.41 and 34.03, respectively. These high RMSE values indicate that the GSMaP rainfall value is quite far from the observed rainfall value. The correlation value between GSMaP rainfall and observations has a high correlation with values of 0.84, 0.90, 0.96 and 0.98 for each date. These results show that the GSMaP data has a good correlation value and can be used for extreme rainfall analysis at the Meteorological Station of H. Asan, East Kotawaringin.
Distribution of Drought on Agricultural Land in Palabuhanratu District Sukabumi Regency
Jurnal Geografi : Media Informasi Pengembangan dan Profesi Kegeografian Vol 20, No 1 (2023)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jg.v20i1.41285

Abstract

Drought is one of the natural disasters that causes substantial losses to food crop production, water supply in several important sectors such as industry, settlements, and agriculture. Climate change often causes drought on agricultural land and can indirectly threaten livelihoods and food security. This study aims to analyze the distribution of drought on agricultural land and examine the relationship between physical conditions. Drought monitoring study using remote sensing methods on Landsat 8 OLI imagery with the Normalized Difference Drought Index (NDDI) algorithm is the result of combining two parameters, namely the Normalized Difference Vegetation Index (NDVI) and Normalized Difference Water Index (NDWI). The results of the study show the distribution of agricultural land drought in Palabuhanratu District, Sukabumi Regency during 2018-2021 with five classes (normal, mild, moderate, severe, and very severe), and a very severe drought category of 80.78 ha in 2021, followed by 2018 an area of 32.09 ha. The most potential drought areas are in Palabuhanratu District, namely Jayanti Village and Citepus Village.

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