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INDONESIA
Bumi Lestari Journal of Environment
Published by Universitas Udayana
ISSN : -     EISSN : -     DOI : -
Core Subject : Social,
Bumi Lestari Journal of Environment (ISSN: 1411-9668) is a peer-reviewed journal, presents original research articles and letters in all areas of environmental studies and environmental sciences (biotic, abiotic and social/cultural). This journal is Nationally Accredited by Directorate General of Higher Education (Terakreditasi DIKTI) decree No: 64a/DIKTI/Kep/2010, Ministry of National Education, Indonesian. Bumi Lestari Journal of Environment has been indexed by DOAJ (Directory of Open Access Journals), cabdirect cabi.org, AJD (Academic Journals Database), ISJD (Indonesian Scientific Journal Database), IndexCopernicus, Portal Garuda, researchBib and Google Scholar.
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Articles 348 Documents
VARIABILITAS MUSIMAN CLOUD GROUND LIGHTNING DAN KAITANNYA DENGAN POLA HUJAN DI WILAYAH JAWA (SUDI KASUS BANDUNG DAN SEMARANG) Septiadi, Deni; Tjasyono, Bayong
Bumi Lestari Journal of Environment Vol 11, No 1
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The objective of this paper is to describe the relationship between CG (Cloud Ground) lightning observation data to rainfall in Java region. CG lightning data obtained by using Lightning Detector that is able to track low frequency of radio signals from electrical processes lightning discharge and installed in Bandung Geophysics Station. For better resolution, data is limited within a radius of 10 km square of study area. The results showed a strong relationships between CG and rainfall (r2 = 0.9) and the dominance of CG+ compared with CG- throughout the season with a peak in the MAM (March-April-May) for Bandung (40.6%) and DJF ( December-January-February) for Semarang (48%). Understanding of the peculiarities of lightning activity will provide important information in the structure, the growth of clouds, atmospheric labilitas or as a warning extreme weather. Therefore, it is possible to utilize CG lightning as predictors for rainfall prediction.
ARTIFICIAL NEURAL NETWORKS UNTUK PEMODELAN CURAH HUJAN-LIMPASAN PADA DAERAH ALIRAN SUNGAI (DAS) DI PULAU BALI Dharma, IGB. Sila; Putera, IGA. Adnyana; Ardana, Putu Doddy Heka
Bumi Lestari Journal of Environment Vol 11, No 1
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Rainfall-runoff transformation of a watershed is one of the most complex hydrology phenomena, nonlinier process, time-varying and spatial distribution. Rainfall-runoff relationships play an important role in water resource management planning and therefore, different types of models with various degrees of complexity have been developed for this purpose. The application of Artificial Neural Networks (ANNs) on rainfall-runoff modelling has studied more extensively in order to appreciate and fulfil the potential of this modelling approach. Back propagation method has used in this study for modelling monthly rainfall for small size catchments areas. ANN model developed in this study successfully predicts relationship for rainfall-runoff with 90.14% accuracy on learning process and 72.41% accuracy on testing process. These results show that ANN provides a systematic approach for runoff estimation and represents improvement in prediction accuracy.
CARBON CAPTURE ON FLUIDIZED BED COMBUSTION OF BIOMASS AND WASTES FUELS Winaya, I Nyoman Suprapta
Bumi Lestari Journal of Environment Vol 11, No 1
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Usaha yang dilakukan secara terus menerus dalam rangka mengurangi emisi CO2 untuk mencegah terjadinya pemanasan global telah mendorong penggunaan energi baru seperti biomasa maupun sampah sebagai bahan bakar alternatif pengganti energi bahan bakar fosil. Akan tetapi, bila bahan bakar biomasa/sampah dimasukkan pada sistem pembakaran fluidized bed, evolusi zat volatil akan terjadi sangat cepat. Ini dikarenakan oleh tingginya laju perpindahan panas oleh material hamparan di dalam ruang bakar sehingga zat volatil hanya berevolusi di sekitar tempat pemasukan bahan bakar. Karena ketidakcukupan oksigen di bagian atas ruang bakar maka pembakaran sempurna sangat sulit terwujud. Formasi hidrokarbon sering terjadi dan diantisipasi akan memunculkan dioksin pada gas buang. Evolusi volatil juga menyebabkan temperatur sangat tinggi di sembarang tempat pada ruang bakar dan kondisi ini akan menyebabkan formasi emisi NOx . Penelitian ini bertujuan untuk menangkap karbon dari evolusi zat volatile yang terjadi pada pembakaran sistem fluidized bed berbahan bakar sampah. Karbon ditangkap dengan menggunakan partikel berpori sehingga terbentuk karbon-deposit. Pada penelitian ini, karbon-deposit dibakar kembali pada suhu pembakaran fluidized bed untuk meningkatkan efisiensi pembakaran. Dispersi horisontal karbon-deposit di atas hamparan material diukur berdasarkan besarnya laju pembakaran, skala horisontal ruang bakar dan dispersi horizontal karbon yang terbakar. Dengan memperhitungkan tingkat oksidasi dan konsentrasi oksigen pada pembakaran karbon-deposit, model perhitungan yang dimodifikasi dari model Kunni-Levenspiel dikembangkan untuk menggambarkan dispersi horizontal karbon-deposit tersebut. Hasil eksperimen dapat dibuktikan sama dengan model perhitungan yang dikembangkan.
INTERVENSI ERGONOMI PADA AKTIVITAS BELAJAR DI RUMAH KOS DAERAH DINGIN MENINGKATKAN KINERJA MAHASISWA Pungus, Meity Martina; Tirtayasa, Ketut
Bumi Lestari Journal of Environment Vol 11, No 1
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Learning activity at home is a routine task performed by the students as the implementation of academic curriculum. Most of activities done by the students in respect to the implementation of the academic curriculum such as in preparing self and structured tasks, in writing practicum reports, in preparing for the mid and last exams of the semester, are done at home. In general, the students of the faculty of mathematics and natural sciences (FMNS), Manado State University, live in homes of Minahasa tradition. In fact, conventional activity done by the students at the lease home of Minahasa tradition in cool area showed unfavorable risks to students based on the load of learning with indicators of musculoskeletal complaints, boredom, and fatigue. Consequently, the students were not yet able to attain the intended performance based on indicators the accuracy, speed, constancy and the results of working. In other words, the conventional activity is not able to be an ergonomic one. To overcome the problems, by using total ergonomics approach (TEA), it has made the efforts of ergonomics interventions. In order to test the capability of the ergonomics interventions, it had been done a research with the hypothesis, the ergonomics interventions on the activity in boardinghouse of Minahasa tradition: (1) increases the accuracy of working; (2) increase the speed of working; (3) increase the constancy of working; and (4) increase the results of working of the students. This research was done in two periods by utilizing the treatment by subject design. The first period, without intervention, was done during four weeks. The second period, with intervention, was also done during four weeks. The subjects utilized in the research were as many as 15 persons. The measurements of dependent variables were done before and after doing the activity of learning in every unit of activity. The results of the research showed that the ergonomics interventions on the learning activities in boardinghouse could significantly (p<0.05): (1) increases the accuracy of working 55.06%; (2) increase the speed of working 17.32%; (3) increase the constancy of working 30.72%; and (4) increase the results of working of the students 131.44%. The ergonomics interventions were successful in overcoming the ergonomic problems in the learning activity in boardinghouse. Based on the research it can be concluded that the ergonomics interventions can increase the performance of the students with indicators; increasing the accuracy of working; increasing the speed of working; increasing the constancy of working; and increasing the results of working of the students. It can be suggested that for the lecture of Basics Physics II, the learning activity with ergonomic interventions can be an alternative for the lecturer team so that the students achieve the intended performance.
THE CHARACTERISTIC OF WATER QUALITY AT BATUR LAKE, KINTAMANI DISTRIC, BALI PROVINCE Arthana, I Wayan
Bumi Lestari Journal of Environment Vol 11, No 1
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Batur Lake located at Kintamani district, Bangli regency is the biggest lake in Bali that is very important as water stocking for Bali area. Collecting samples at 50 substations was done from June up to October 2009. Temperature value at Batur Lake varied of 23 °C - 25 °C with average of 23.88 °C. The water clarity was around 1.58 - 2.90 meter with the average of 2.32 meter. The average value of water quality of BOD5 and COD were 3.817 ppm and 6.333 ppm respectively. The average content of ammonia was 0.4545 ppm and for Sulfide was 0.0009 ppm. The nutrient content in Batur Lake is that nitrate value varied of 0.0174 - 3.6070 ppm with average of 1.1498 ppm. Phosphate content was from no detection up to 0.3610 ppm with the average of 0.1242 ppm. Heavy metals, the average content of Cd, Pb, Cu and Fe were 0.0038 ppm, 0.0023 ppm, 0.0055 ppm and 0.0428 ppm respectively. There is a strong positive correlation between COD and BOD5 that the higher content of the COD the higher BOD5 content as well with correlation value of R2 = 0.927. The ratio value between COD and BOD5 (COD/ BOD5) varies of 1.061 – 12.163 with the average value of 2.492 ± 1.909.
PEMETAAN KONDISI KARANG TEPI (FRINGGING REEF) DAN KUALITAS AIR PANTAI ANGSANA KALIMANTAN SELATAN Yunandar, Yunandar
Bumi Lestari Journal of Environment Vol 11, No 1
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Abstract

Batur Lake located at Kintamani district, Bangli regency is the biggest lake in Bali that is very important as water stocking for Bali area. Collecting samples at 50 substations was done from June up to October 2009. Temperature value at Batur Lake varied of 23 °C - 25 °C with average of 23.88 °C. The water clarity was around 1.58 - 2.90 meter with the average of 2.32 meter. The average value of water quality of BOD5 and COD were 3.817 ppm and 6.333 ppm respectively. The average content of ammonia was 0.4545 ppm and for Sulfide was 0.0009 ppm. The nutrient content in Batur Lake is that nitrate value varied of 0.0174 - 3.6070 ppm with average of 1.1498 ppm. Phosphate content was from no detection up to 0.3610 ppm with the average of 0.1242 ppm. Heavy metals, the average content of Cd, Pb, Cu and Fe were 0.0038 ppm, 0.0023 ppm, 0.0055 ppm and 0.0428 ppm respectively. There is a strong positive correlation between COD and BOD5 that the higher content of the COD the higher BOD5 content as well with correlation value of R2 = 0.927. The ratio value between COD and BOD5 (COD/ BOD5) varies of 1.061 – 12.163 with the average value of 2.492 ± 1.909.
KONDISI KOMUNITAS TERUMBU KARANG DI PANTAI BIAS PUTIH DESA BUGBUG KECAMATAN KARANGASEM KABUPATEN KARANGASEM BALI Restu, I Wayan
Bumi Lestari Journal of Environment Vol 11, No 1
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The extent of coral reefs in Bali province is 7200 ha. It spreads out in almost all districts, except Bangli. The condition status of coral reefs has been greatly reduced recently due to rampant fish bombing activities, making sea rocks, seaweed cultivation and the rapid growth of tourism. The conditions status of coral reefs in Bali (2010) are as follows: excellent (3.8%), good (35.8%), moderate (39.6%) and bad (20.8%). Research on the condition status of coral reefs in Bias Putih Beach of Bugbug Village, Karangasem District, Karangasem Regency, Bali is intended to provide basic data about the condition status of coral reefs that can be used as a consideration on its management. Manta Tow Survey and Line Intercept Transect were implemented as methods on this research. The results showed the condition status of coral reefs was between moderate to good with the description as follows: manta tow results showed that living coral cover were categorized between 2 and 3, with the percentage of cover between 11-50 %, while soft corals were categorized between 1 and 3, and the results of Line Intercept transect were categorized into showing up very well with the percentage of living coral coverage ranged between 66.34% and 87.36%. Species diversity of coral was observed to be high with H values ranging between 3,133934 and 3,167543 and its equitability values was observed to be high ranged between 0,94340 and 0,9535. Thus, it is concluded that the condition status of coral reefs in Bias Putih Beach, of Bugbug Village, Karangasem, Bali to be categorized into good or very good.
PEMETAAN POHON BERNILAI BUDAYA BALI YANG LANGKA DI KOTA DENPASAR Mahendra, Made Sudiana; Sukewijaya, I Made; Asmiwyati, I G. A.A. Rai
Bumi Lestari Journal of Environment Vol 11, No 1
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Plant has highly visible socio cultural role for Hindu people in Bali. Even though these plants were existed in the field, it was difficult to identify, monitor and update their existences. The objectives of this research are to identify the endangered socio cultural trees and to make a mapping system of the endangered socio cultural trees in Denpasar based on web. Mapping system was made using MySQL, PhP, Mapserver, Macromedia Dreamweaver and Mozila Firefox. As many as 39 species of socio cultural trees were categorized in endangered risk. The data inventory of cultural trees in Denpasar can be quickly accessed and effectively managed by Mapping Program.
ANALISIS VEGETASI DI KAWASAN HUTAN DANAU BUYAN TAMBLINGAN BALI SEBAGAI DASAR UNTUK MANAJEMEN KELESTARIAN KAWASAN Sutomo, Sutomo; Darma, I Dewa Putu
Bumi Lestari Journal of Environment Vol 11, No 1
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Vegetation analysis in Buyan-Tamblingan Nature Recreation Area aimed to identified whether there were differences between the two communities in terms of vegetation structure and composition. NMDS ordination revealed data that support the hypotheses that the two communities were different (RANOSIM=0.7 p<0,001). Species diversity was also different between these communities. Buyan area had higher diversity index (Shannon 2,00) compare to Tamblingan (1,60). Differences in tourism activities and impacts were proposed to be one of the reason behind the results. Restoration in a form of reintroduction, to reintroduce and re-planting native or local species is proposed to be conducted in the Buyan Lake areas to conserve the ecosystem and prevent exotic species to become invasives and dominates the area.
ANALISIS VEGETASI DAN PENDUGAAN KARBON TERSIMPAN PADA POHON DI KAWASAN SEKITAR GUNUNG DAN DANAU BATUR KINTAMANI BALI Sujarwo, Wawan; Darma, I Dewa Putu
Bumi Lestari Journal of Environment Vol 11, No 1
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Reforestation program of bare land with planting several species of trees has been done on several areas around Mountain and Lake Batur. So that, the study of trees vegetation analysis and estimating of carbon stock needs to be done as well. A total 2400 m2 Sampling Plot with 6 plots (20 x 20 m) in four areas has been established to determine trees structure, composition, and carbon stock (above ground) in around Mountain and Lake Batur Kintamani. Enumeration of all tree species revealed that there were 11 species and 10 families with Eucalyptus urophylla (Myrtaceae) was the most abundant species and family in the Sampling Plot with INP was 97.24%. Shannon Index (H’) revealed that tree species composition was 0,8. It means the diversity of trees is low. The amount of carbon stock (above ground) was 28.0669 ton per 0.24 Ha. It means, total carbon stock in 400 Ha secondary forest around Mountain and Lake Batur was 46,778.17 ton.

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