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INDONESIA
Journal of Environment
Published by Universitas Udayana
ISSN : -     EISSN : -     DOI : -
Core Subject : Social,
Environmental Science
This journal is devoted to publish research papers such as environmental biology, environmental physics, environmental health, ecology, geosciences and environmental chemistry including such matters as land, water, food, conservation, population, risk analysis, pollution, energy, economics of ecological and non-ecological approaches, social advocacy of arguments for change, analytical methods, legal measures, implications of urbanism, energy choices, waste disposal, health effects, recycling, transport systems, political approaches, social impacts and other issues of mass society. There is concern also for marginal areas, under-developed societies, minorities, species loss, etc.
Arjuna Subject : -
Articles 6 Documents
 1 
Monitoring of Merapi Volcano Deformation Using Interferometry Synthetic Aperture Radar (InSAR) Technique Pamungkas, Ayu Margaworo; Osawa, Takahiro; Adnyana, I Wayan Sandi
Journal of Environment Vol 1 No 1
Publisher : Graduate Study of Environmental Sciences, Postgraduate Program of Udayana University

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Abstract

The Merapi volcano is the most active volcano in Indonesia until now, because of eruption occur every two or five years. To minimize the impact of volcanic eruptions need to monitor the volcanic activity, one effort in monitoring is to monitor the surface changes (deformation) around the volcano. These surface changes can be monitored with InSAR technique. In this study monitoring by analyzing the Digital Elevation Model (DEM) and displacement map from result processing using InSAR technique. The accuracy of DEM compare with Shuttle Radar Topography Mission (SRTM) DEM. These results showed that after the eruption in 2006 led to the deflation that occurred in 2007. In 2010 after the eruption led to deflation in some areas of Merapi volcano. Whereas in 2008 due to the absence of volcanic activity that occurred then the deformation is not so large changing. Test on the DEM from the process of InSAR compare with SRTM DEM produced an accuracy of 96%.
Numerical Simulation on Shoreline Change in Western Region of Badung Regency, Bali, Indonesia Triwahyuni, Andhita; Asai, Koji
Journal of Environment Vol 1 No 1
Publisher : Graduate Study of Environmental Sciences, Postgraduate Program of Udayana University

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Abstract

Shoreline change is considered the most dynamic processes in coastal region. Coastal erosion is a global problem where 70% beaches around the world are recessional. Almost all coastal area in Bali is potential to suffer from erosion. Badung Regency in Bali has many beaches that famous as tourism area where from about 64 km shoreline length, 11,5 km were recorded suffered by erosion in 1985 and 12,1 km erosion in 2007. This study aims to determine the value of shoreline changes that occur in western of Badung Regency from 2001 to 2010 based on the predicted wave data using monthly wind data from Ngurah Rai, Tuban, Badung, Bali meteorological station. Shoreline change simulation measured the forward (accretion) or backward (erosion) distance of the shoreline on the East-West direction. Bali has wind patterns that influenced by the Northwest monsoon from November-April and Southeast monsoon from May-October. In 2001-2010, dominant wind in this region was coming from east, southeast, and west. Geographically western coast of Badung influenced by incoming winds from the west, southwest, and south. Wind blow towards the coast in 2001-2010 are dominantly come from the west with wind speed range was about 1,7-4,7 m/s. Simulation indicated that generally shoreline tends to experience accretion in the north and erosion in the south. From 16000 m of study shoreline, along 7100 m of shoreline tend to suffer by erosion. Oppositely, along 8900 m of shoreline tend to have accretion.
Phytoplankton Diversity as Ecological Indicator in Jimbaran Bay Waters Perwira, Ima Yudha; Ulinuha, Devi
Journal of Environment Vol 1 No 1
Publisher : Graduate Study of Environmental Sciences, Postgraduate Program of Udayana University

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Abstract

A study was carried out to evaluate the ecological condition in Jimbaran Bay Waters by using Phytoplankton Diversity Index. The study was conducted at Balangan, Pemuda, Jimbaran, Kedonganan, Kelan and Segara Beach located in Jimbaran Bay. Shannon-Wiener diversity index was used to analyze the ecological condition, supported by analysis on water quality including dissolved oxygen (DO), biological oxygen demand 5 days (BOD5), water pH, and water salinity. There were 51 species of phytoplankton classified to 5 classes had been observed from this study: Bacillariophycae, Cyanophyceae, Zygnemophyceae, Dinophyceae, and Chlorophyceae. Balangan beach showed higher diversity index (H) and evenness index (E) (H = 1.19; E = 0.29) compared to the other site (Pemuda: H = 0.89, E = 0.25; Jimbaran: H = 0.89, E = 0.26; Kedonganan: H = 0.96, E = 0.28; Kelan: H = 0.85, E = 0.20; and Segara: H = 0.91, E = 0.33). However, overall ecological condition showed diversity index more than 1 (H = 1.44; E = 0.27). Measurement of water quality showed that the highest quality of water was shown by Balangan Beach (DO 5.2 mg/L, pH 7.2, salinity 29 ppt, and BOD5 0.9 mg/L), while the lowest was shown by Kelan Beach (DO 4.2 mg/L, pH 7.2, salinity 29 ppt, and BOD5 2.9 mg/L). Result of the study showed that ecological status of Jimbaran Bay Waters was having moderate diversity, sufficient productivity, and medium ecological pressure (pollution).
Predicting Flood Vulnerable Areas by Using Satellite Remote Sensing Images in Kumamoto City - Japan Rimba, A. Besse; Miura, Fusanori
Journal of Environment Vol 1 No 1
Publisher : Graduate Study of Environmental Sciences, Postgraduate Program of Udayana University

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Abstract

Flood is a natural disaster that occurs almost every year in Japan. Based on the flood record, it occurs during the rainy season around July each year. The aim of this research is to predict areas vulnerable to flood. The current research location is the Shiragawa watershed. This study was carried out using DEMs data, ALOS AVNIR-2 and Amedas data to produce watershed area, vegetation index, land cover map and isohyet map.  DEM data with spatial resolution of 10 meters was derived from the Geospatial Information Authority of Japan (GSI) in order to show the watershed. The AVNIR-2 imagery was used to create the land cover map and the vegetation index. The land cover map was created by unsupervised method then verified by using land cover map of the Geospatial Information Authority of Japan (GSI). Vegetation index was created by using Normalize Vegetation Index (NDVI) algorithm. The isohyet was obtained using data from rain gauges stationed in Kumamoto Prefecture then interpolating by applying the kriging method. All spatial data was overlaid to create the flood vulnerability map by using Geographic Information System (GIS). This study combines all the data to predict vulnerable areas of flood. The result indicates that the flood occurs in the middle part of Shiragawa watershed.
Study on Growth Rate and Seaweed Eucheuma spinosum And Euchema cottoni in Waters of Kutuh Village, South Kuta Sub-District, District of Badung-Bali Wiyanto, Dwi Budi
Journal of Environment Vol 1 No 1
Publisher : Graduate Study of Environmental Sciences, Postgraduate Program of Udayana University

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Abstract

Seaweed is a non-fish fishery commodity. The market demand for seaweed, both from the domestic and foreign markets has a bright future as a trade commodity on the international market. Bali is one of the islands of seaweed producers in Indonesia. Seaweed production in Bali in 2008, decreased to 15.2% compared to that in 2007. The purpose of this study was to determine how big the difference between the growth rate of E. cottonii seaweed and that of E. spinosum. Seaweed cultivation was conducted using raft off the base (off bottom method) of 2 units with the size of 5 x 2.5 meters each. Spacing of each seed was 25 -30 cm. Seed weight of seaweed E. cottonii and E. spinosum is equal to 100 grams. Maintenance time was for 40 days, and the sampling was done once every 10 days as many as 10 samples of seaweed. The results showed that seaweed E. cottonii had faster growth compared with E. spinosum. Seaweed daily growth of the species E. spinosum in the first 10 days was faster than the seaweed of the species E. cottonii. However, the second 10 days to the third 10 days E. cottonii seaweed growth was faster than E. spinosum. The average weight of Euheuma cottonii for 40 days planting was 189.29 grams while the average weight of Eucheuma spinosum was 185.55 grams. Water condition in the location of research was still in the normal range for the growth of two species of seaweed cultivated.
Study on Mollusk and Algae or Phytoplankton Community in Southeast Waters of Bali Ulinuha, Devi; Perwira, Ima Yudha
Journal of Environment Vol 1 No 1
Publisher : Graduate Study of Environmental Sciences, Postgraduate Program of Udayana University

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Abstract

A study was carried out to observe the relation between mollusk with algae or phytoplankton in southeast waters of Bali. The study was conducted at Mertasari, Sindhu, Serangan, Purnama, and Kethewel beach. Shannon-Wiener diversity index was used to analyze the ecological condition, supported by analysis on water quality including dissolved oxygen (DO), biological oxygen demand 5 days (BOD5), water pH, and water salinity. There were 34 species of phytoplankton found in this study. The most predominant phytoplankton species in each beach were Navicula sp at Mertasari, Nitzschia sp at Sindhu, Pseudo-nitzschia sp at Purnama, Chaetoceros sp at Kethewel. Observation on macro algae showed that Ulva sp was to be the most predominant species in Serangan, Mertasari, and Sindhu beach (17.95, 16.25, and 17.81%). In mollusk observation, gastropod groups showed to be higher number than bivalve group. Nassarius sp showed to be the most predominant in Serangan beach (13.33%), while Ruditapes sp was predominant in Mertasari and Sindhu beach (11.59% and 14.81%). The highest diversity index of phytoplankton was shown by Kethewel beach (H = 1.35), while the lowest was shown by Shindu beach (H = 0.95). The highest diversity index of macroalgae was shown by Serangan beach which showed H = 2.08, while the lowest was shown by Purnama beach which showed H = 0.69. Serangan beach showed the highest diversity index (H = 2.72) with E = 0.66 compared to another locations, while Kethewel beach showed the lowest diversity index (H = 0.69 and E = 1). There was a relation between the existences of gastropod as the highest number of mollusk and Ulva sp as the gastropod feed.

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