Judul: Analysis of Erosion Management Based on GeoWEPP Spatial Modeling on Bauxite Mining Activities PT. XYZ in West Borneo
Abstrak: Kegiatan 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, diantaranya dengan membuat settling pond. Pembangunan basis data GeoWEPP diantaranya melakukan Pembuatan database peta penggunaan lahan, Peta topografi, Peta tanah dan analisis data curah hujan dan suhu yang kemudian dimodelkan dengan aplikasi GeoWEPP. Perhitungan simulasi GeoWEPP yang dilakukan hanya pada tahap operasional kegiatan tambang. Peta areal kegiatan tambang dalam penggunaan lahan adalah simulasi areal rencana kegiatan yang diperoleh dari Dokumen AMDAL. Rencana blok tambang dikelompokan menjadi 30 blok berdasarkan catchment area dengan total luas 13.602,48 Ha. Berdasarkan hasil analisis model GeoWEPP diperoleh total sedimen sebesar 150.186 m3/bulan dan total jumlah aliran air permukaan sebesar 4.202.267 m3/bulan serta diprediksi sebanyak 30 titik outlet yang akan dijadikan lokasi pembangunan settling pond. Seluruh perhitungan erosi dan sedimentasi merupakan simulasi dari aplikasi GeoWEPP dan tidak dilakukan validasi dengan pengukuran di lapangan. Biaya yang diperlukan untuk pembangunan seluruh settling pond dengan asumsi terdiri dari biaya pembebasan lahan dan biaya penggalian adalah sebesar Rp196.585.791.231 untuk biaya optimis dan Rp222.773.049.768 untuk biaya pesimis. Biaya perawatan dikeluarkan setiap bulan yang terdiri dari biaya pengerukan sedimen dan biaya sampel uji kualitas air. Biaya perawatan settling pond pada 30 titik outlet selama operasional tambang adalah sebesar Rp3.145.414.818. Penanaman cover crops di daerah bekas pertambangan secara efektif mengurangi erosi 0,02 Ton/Ha/Tahun setelah tumbuhan cover crops tumbuh dengan baik., Bauxite Ore open mining activities carried out on a wide area and spread increase the potential for water quality pollution so that good management is needed. One of the GIS spatial modeling that can predict erosion is the Geospatial model of water Erosion Prediction Project (GeoWEPP). GeoWEPP can predict the amount of erosion and map the prediction of the location of sedimentation at bauxite ore mining sites and make management plans and costs for erosion control, delivered by making settling ponds. The construction of GeoWEPP databases includes land use maps, topographic maps, soil maps and analysis of rainfall and temperature data which are then modeled with the GeoWEPP application. GeoWEPP simulation calculations are carried out only at the operational stage of mining activities. he map of the mining activity area in land use is a simulation of the planned activity area obtained from the EIA Document. The results of the analysis of 30 Block/Hills with a total area of 13.602,48 ha obtained sediment of 150.186 m3/month and the number of surface water flows (run off) of 4.202.267 m3/month. Based on GeoWEPP's analysis on the mine block area plan obtained 30 outlet points that will be used as a construction site for settling pond. All erosion and sedimentation calculations are simulations of the GeoWEPP application and are not validated with measurements in the field. The cost required for the construction of the entire settling pond is Rp196.585.791.231 for optimistic
Keyword: Bauksit, Erosi, GeoWEPP, Sedimen, Settling pond

Judul: Performa Sereh Wangi (Cymbopogon nardus L) Dalam Memperbaiki Fisik Tanah dan Konservasi Tanah Pada Lahan Pasca Tambang Batubara
Abstrak: Mining activities had positive and negative impacts on the environment. Erosion is one of the negative impacts that must be managed. The quality of this ex-mining land must be improved through reclamation activities which are expected to slowly return the soil to its original state. Evaluation of several physical characteristics of PT Berau Coal's post-mining land, to analyze erosion predictions from post-mining land as well as from the results of citronella revegetation and its opportunities in the essential oil business that will be carried out by PT Berau Coal as an effort to create sustainable development by selecting valuable crops. economical and ecological. Soil sampling at the Binungan Site in locations where cover crops and citronella are planted. the objectives of this study are 1) To evaluate the physical and chemical properties of the soil in the post-mining area of PT. Berau Coal, 2) Analyzing the estimated erosion in the post-mining area of PT. Berau Coal and 3) Analyzing the cost of revenue from the citronella revegetation business in the post-mining area of PT. Berau Coal. The analytical methods used are analysis of erosion prediction using USLE, analysis of physical and chemical properties of soil using laboratory analysis and cost-of-income analysis. The results showed that the physical properties of the soil at the study site were dominated by the clay fraction between 23.58-46.72%, followed by the sand fraction 10.20-48.73% and the dust fraction between 13-66.22%. The N content in the soil is classified as low to very low, the value is 0.09-0.13%. The value of bulk density is 1.27 gr/cm3-1.76 gr/cm3, the level of soil permeability is classified as slow to rather fast, and the porosity is categorized as poor to good. The magnitude of the erosion prediction that occurred at the study site using the USLE method which was planted with covercrop at a slope of 10% (Pit D2 CC D) had the lowest erosion value of 18.13 tons/ha/yr, while the highest was at the study site planted with citronella grass at 30% slope (Pit H4 SW L) of 268.91 tons/ha/year. The results of the calculation of the cost analysis of citronella oil business obtained a profit of Rp. 69,627,951 yr/ha.
Keyword: Sereh wangi, erosi, usle, lahan pasca tambang

Judul: Infeksi Cacing Jantung Dirofilaria Immitis, Railliet & Henry, 1911 Pada Anjing
Abstrak: Cacing Dirofilaria immitis dewasa yang tinggal dalm ventrikel kanan jantung anjing, sering kali menimbulkan gejala klinis yang cukup berat. Cacing Tersebut menghasilkan mikrofilaria yang selanjutnya berkembang menjadi larva infektif dalam saluran malphigi induk semang entara, yaitu nyamuk dari genus Culex, Aedes dan Anopheles.
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