Jurnal Pengelolaan Sumberdaya Alam dan Lingkungan (Journal of Natural Resources and Environmental Management)
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COASTLINE CHANGES IN INDRAMAYU REGENCY BETWEEN 1989-2019
Get PDFBasically, coastline changes include accretion (raised soil) and abrasion. This study aims to analyze coastline changes in the Indramayu Regency between 1989 and 2019, as well as the causing factors. The secondary data were obtained from Landsat 5 Satellite Imagery in 1989, 1999, 2009, and Landsat 8 in 2019. This analysis used BILKO method, which is a Landsat image analysis to separate land and sea areas. Then overlay method, which was used to delineate boundary. Spatial analysis showed coastline changes in the Indramayu regency of both accretion and abrasion. In the 1989-1999 period, there was an accretion of 319 ha, while there was an abrasion 1291 ha. Furthermore, in the 1999-2009 period, there was an accretion of 349 ha, and abrasion of 1125 ha. Also, in the 2009-2019 period, there was an accretion of 698 ha, and abrasion of 358 ha. Meanwhile, the factors that cause coastline changes are natural such as wind, waves, currents, as well as human factors such as the conversion of mangrove land to ponds and also planting activities. Therefore, efforts made by the government are making waves containment tool and planting mangrove vegetation.  
Natural Regeneration Capacity of Shorea leprosula Miq. at Gunung Dahu Research Forest in Bogor
Get PDFShorea leprosula is one of the tree species within Dipterocarpaceae family which is a major source for timber production. The species has been planted massively in Gunung Dahu Research Forest (GDRF) in Leuwiliang- Bogor. Gunung Dahu Research Forest is a man-made dipterocarp forest which has varying slope class, topoghraphy and canopy cover. Furthermore, Natural regeneration is an important ecological factor in assessing the ability of forest regeneration, including in a plantation forest. Therefore, it is necessary to know the effect of slope and canopy cover on the regeneration of S. leprosula in order to characterize what factors support and constraint the naturally regenerating forest of Gunung Dahu Research Forest. Regeneration capacity of the species was observed in purposive plots which have been recorded for their flowering events. Seedlings were grouped into seedlings, and saplings. It was measured by census method in every slopes. Meanwhile, Variable observed included, number of available seedling at each slope category slope with its canopy cover, height and diameter of seedlings, and litter thickness. Regeneration capacity of the species was observed in purposive plots which had been recorded for their flowering events. Seedlings and saplings were taken using the census method. The results show that flat slope with shady canopy cover has the highest capacity of seedlings and the best growth. The uneven distribution of height and diameter indicates the need for silviculture action; such as, maintenance
The effect of campaign of the plastic bag use reduction policy toward “green behavior” of Bogor City society
Get PDFPemerintah Kota Bogor menerbitkan peraturan tentang pengurangan penggunaan kantong plastik untuk mengurangi volume sampah plastik di Kota Bogor. Peraturan tersebut mulai diberlakukan pada tanggal 1 Desember 2018. Penelitian ini bertujuan untuk mengetahui pengaruh sosialisasi kebijakan terhadap kesadaran, sikap dan tindakan masyarakat Kota Bogor dalam mengurangi penggunaan kantong plastik. Penelitian ini menggunakan metode analisis Structural Equation Modelling (SEM). Hasil penelitian ini menunjukkan bahwa terdapat hubungan positif antara sosialisasi kebijakan terhadap pembentukan kesadaran, sikap dan tindakan masyarakat Kota Bogor dalam mengurangi penggunaan kantong plastik. Selain itu, kesadaran dan sikap ramah lingkungan juga memiliki pengaruh yang positif terhadap pembentukan tindakan mengurangi penggunaan kantong plastik. Oleh karena itu, agar kebijakan tersebut dapat berjalan secara efektif maka diperlukan peningkatan sosialisasi kebijakan agar semakin meningkatkan kesadaran, sikap dan tindakan masyarakat Kota Bogor dalam mengurangi penggunaan kantong plastik.
The Municipal Government of Bogor City issued a regulation in reducing the use of plastic bags to decrease the volume of plastic waste in Bogor City. The regulation has been implemented since December 1st, 2018. This study aims to find out the influence of socialization policy on the awareness, attitudes, and actions of Bogor City Society in reducing the use of plastic bags. This study uses the analysis method of Structural Equation Modeling (SEM). The result of this study demonstrates that there is a positive relationship between policy socialization towards the forming of awareness, attitudes, and actions of Bogor City society in reducing the use of plastic bags, in addition, awareness and eco-friendly attitudes also have a positive influence on the forming of actions to reduce the use of plastic bags. Therefore, for the policy to run effectively, it is necessary to increase policy socialization to increasingly heighten awareness, attitudes, and actions of the Bogor City society in reducing the use of plastic bags.
 
Analysis of Erosion Management Based on GeoWEPP Spatial Modeling on Bauxite Mining Activities PT. XYZ in West Borneo
Get PDFKegiatan pertambangan terbuka Bijih Bauksit yang dilakukan pada Areal yang Luas dan tersebar meningkatkan potensi pencemaran kualitas air sehingga diperlukan pengelolaan dengan baik. Salah satu pemodelan spasial GIS yang dapat memprediksi erosi adalah model Geospatial of water Erosion Prediction Project (GeoWEPP). GeoWEPP dapat memprediksi besaran erosi dan memetakan prediksi lokasi terjadinya sedimentasi di lokasi kegiatan penambangan bijih Bauksit serta membuat rencana pengelolaan dan biaya untuk pengendalian erosi, diantarnya dengan membuat settling pond. Pembangunan basis data GeoWEPP diantaranya melakukan Pembuatan peta penggunaan lahan, Peta topografi, Peta tanah dan analisis data curah hujan dan suhu. Hasil analisis terhadap 30 bukit dengan total luas 13 602.48 Ha didapatkan Sedimen sebesar 150 186 m3/bulan dan jumlah aliran air permukaan (run off) sebesar 4 202 267 m3/bulan. Berdasarkan analisis GeoWEPP pada rencana areal blok tambang didapatkan 30 titik outlate yang akan dijadikan lokasi pembangunan settling pond. Biaya yang diperlukan untuk pembangunan seluruh settling pond adalah sebesar Rp. 222 047 640 944 untuk biaya optimis dan Rp. 222 773 049 768 untuk biaya pesimis. Biaya perawatan settling pond pada seluruh titik outlate selama operasional adalah sebesar Rp. 3 145 414 818. Penamanan cover crops pada areal bekas tambang sangat efektif mengurangi erosi, Sehingga setelah kegiatan tambang telah selesai dilakukan, sebaiknya segera dilakukan penataan lahan dan penanaman cover crops.Bauxite ore open-pit mining activities are conducted in spread areas and increase the potential for water pollution, implying a need for good management. GeoWEPP is a spatial model that predicts the erosion magnitude and the location of sedimentation. This helps in erosion management and control, including constructing a settling pond. Therefore, the purpose of this study was to examine GeoWEPP based on land use, topographic and soil maps, as well as rainfall and temperature data. The results showed that 30 hills with a total area of 13 602.48 Ha obtained sediment of 150 186 m3/month and the amount of run off of 4 202 267 m3/month. Furthermore, GeoWEPP analysis on the planned mining block area obtained 30 outlet points to be used as the location for the settling pond construction. The optimistic and pessimistic cost of constructing the entire settling pond is Rp. 222 047 640 944 and Rp. 222 773 049 768, respectively. Additionally, the cost of settling pond maintenance at all outlet points during operation is Rp. 3 139 414 818. Planting cover crops in ex-mining areas is very effective in reducing erosion
Response of Eucalyptus pellita and Eucalyptus deglupta seedling growth to aluminum exposure
Get PDFAluminum (Al) is one of the problems and is a factor inhibiting plant growth on soils with acidic pH. This study aims to examine the growth response of Eucalyptus pellita and Eucalypus Deglupta seedlings to Al exposure. This study used a completely randomized design (CRD) with one factor, where the Al concentration consisted of 5 levels, namely: 0 mM (control), 2 mM, 4 mM, 6 mM, and 8 mM with 3 repetitions each and each repetition consisted of 3 units of the plant. The results showed that Al treatment had a significant effect on the growth parameters of both plant types, except for the root dry weight parameter for E. deglupta. Increasing the Al concentration can reduce almost all growth parameters. The 4 mM Al concentration was able to increase the height growth, plant dry weight (roots and shoots), and tolerance index for the E. pellita species, while the Al 2 mM concentration was able to increase the root growth of E. deglupta plants. Almost all growth parameters for E. pellita species were higher than that of E. deglupta, except for the SPAD chlorophyll index. The concentrations of 6 mM and 8 mM were toxic to E. pellita and E. deglupta
Contributing Factor Influencing Flood Disaster Using MICMAC (Ciliwung Watershed Case Study)
Get PDFFlood disaster is the most common disaster in Indonesia, flood events continue to increase and occur almost every year during the rainy season, on average caused by extreme rainfall above 100 mm, with the number of losses increasing every years, there are many factors that affect One of the causes of flooding is human activities resulting in changes in land use in the form of settlements and agricultural land. This paper aims to present a conceptual reference from the implementation results using software assistance, to determine the level of influence and dependent variables. The method used to assess the most influential factors on flood events, especially in the Ciliwung watershed, is by using Cross-Impact Matric Multiplication Applied to Classification (MICMAC). From the 11 contributing factors analyzed based on the Matrix of Direct Influence (MDI) and Matrix of Indirect Influence (MII) it is known that rainfall and distance from the river are the variables that have the most influence. While the variables with the greatest dependence based on MDI and MII are land cover, slope, population density and river waste, with institutions experiencing a larger variable displacement compared to other variables. The results of the identification of these contributing factors can be used by stakeholders to be careful of each factor as input in anticipating influencing factors
An Application of Deep Learning Technique to Improve Subseasonal to Seasonal Rainfall Forecast over Java Island, Indonesia
No full textSubseasonal to seasonal (S2S) rainfall forecast can benefit several sectors, such as water resources, hazard management, and agriculture. However, the forecast remains challenging due to its lack of skill. This study applies Convolutional AutoEncoders (ConvAE), a deep learning technique, to improve the quality of the S2S rainfall forecast. Seven S2S model output incorporated with Subseasonal Experiments Projects (SubX), including CCSM4, CFSv2, FIMr1p1, GEFS, GEOS_v2p1, GEPS6, and NESM, are corrected using the ConvAE approach. We combine 407 ground observations and the CHIRPS dataset using regression kriging methods producing gridded daily precipitation data with 0.05° spatial resolution. We utilize this dataset as a label to train ConvAE models and to perform bias corrections to all members of the SubX forecasts data. The results show that ConvAE is able to increase the quality of weekly S2S rainfall forecasts over Java, Indonesia. The Correlation Coefficient for 1 – 4 weeks lead time are improved from: 0.76, 0.715, 0.692 and 0.722 towards 0.809, 0.751, 0.719 and 0.74, respectively. Furthermore, the average CRPSS improves between 20 – 30% for all lead times
Pollution Load Capacity in the Downstream Citarum Watershed: 4 years after Citarum Harum Program
Get PDFCitarum River is one of the strategically valuable rivers in Indonesia, especially on Java Island. Since 2018, the central government has carried out the "Citarum Harum" program to revitalize the river while improving its reputation of Citarum as one of the dirtiest rivers in the world. This study aimed to see the pollution load capacity of the downstream Citarum River 4 years after the revitalization program was implemented. Downstream Citarum Watershed (Karawang Regency) was chosen as the focus of the study site because of the very high risk of contamination. This research was comparing the pollution load capacity of biochemical oxygen demand (BOD) in 2022 using Qual2Kw software and 2017 based on the data analyzed by the Ministry of Environment and Forestry. River revitalization over the last 4 years has significantly reduced the BOD value in the downstream Citarum Watershed. The success of this revitalization program can be a reference for other watershed management toward environmental improvement using the same scheme. This study is expected to provide updated information on water quality in the downstream Citarum watershed several years after revitalization and provide an overview of the important functions of river revitalizatio
Vegetation composition on peatlands with different fire frequency in Musi Banyuasin, South Sumatra
Get PDFLahan gambut memiliki kemampuan untuk memulihkan lingkungannya sendiri melalui proses suksesi vegetasi ketika mengalami kebakaran. Area dengan frekuensi kebakaran yang berberda memiliki dominasi vegetasi yang berbeda. Pengamatan dilakukan pada area yang mengalami frekuensi satu, dua, tiga dan empat kali terbakar. Tujuan penelitian ini untuk menjelaskan perbedaan vegetasi yang menyusun area dengan frekuensi kebakaran berbeda. Vegeteasi tingkat pertumbuhan pancang dan tumbuhan bawah ditemukan pada semua area frekuensi terbakar, tingkat pertumbuhan semai ditemukan pada area satu dan tiga kali terbakar, tingkat pertumbuhan tiang ditemukan pada area satu kali terbakar dan tingkat pertumbuhan pohon ditemukan pada area satu dan dua kali terbakar. Tingkat pertumbuhan pancang pada area frekuensi satu kali terbakar didominasi oleh vegetasi Sepongol, area frekuensi dua kali terbakar didominasi oleh Bangun-bangun dan area frekuensi tiga dan empat kali terbakar didominasi oleh Melastoma malabatrihcum. Tumbuhan bawah pada area dengan frekuensi satu, dua dan tiga kali terbakar didominasi oleh Asplenium longissimum dan pada area dengan frekuensi empat kali terbakar didominasi oleh Athyrium esculentumPeatlands that experience fire have the ability to restore their own environment through a process of vegetation succession. Areas with different frequency of fires have different vegetation dominance. Observations were made on areas that experienced a frequency of one, two, three and four times burned. The purpose of this study was to explain the differences in vegetation that make up areas with different fire frequencies. Vegetation growth rates of saplings and understorey were found in all burnt frequency areas, seedling growth rates were found in areas one and three times burned, pole growth rates were found in one burnt area and tree growth rates were found in areas one and two burns. The growth rate of saplings in the one-time burns frequency area was dominated by Sepongol vegetation, the two-burn frequency area was dominated by Bangun -anguns and the three and four-time burnt frequency areas were dominated by Melastoma malabatrihcum. Lower plants in areas with a frequency of one, two and three times burned were dominated by Asplenium longissimum and in areas with four times the frequency of burns was dominated by Athyrium esculentum
Potential Utilization of Municipal Solid Waste in Landfill Mining TPST Bantargebang Bekasi to Become Refuse Derived Fuel (RDF) Feed Stock
Get PDFBantargebang Integrated Waste Management Site (TPST) is a final waste processing site that accommodates waste from the DKI Jakarta Province. Most of the waste that enters the Bantargebang TPST is piled up at the dumping point in each zone, so this can lead to a new problem, namely the filling of all existing stockpile zones. One of the technologies that can be used to solve the problem of full landfill zones. One technology to overcome this problem is landfill mining. The results of the study related to landfill mining at the Bantargebang TPST were carried out to determine the potential for utilizing landfill mining waste to become RDF feed stock. Based on the study of the composition of landfill mining results carried out, the waste to be used as raw material for RDF is waste with a diameter > 50 mm and which has a high calorific value