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RELATIONSHIP BETWEEN CHLOROPHYLL-A AND SEA SURFACE TEMPERATUR WITH Sardinella lemuru CATCHING IN BALI STRAIT Niken Gustantia; Takahiro Osawa; I Gusti Bagus Sila Dharma; Wayan Sandi Adnyana
ECOTROPHIC : Jurnal Ilmu Lingkungan (Journal of Environmental Science) Vol 15 No 1 (2021)
Publisher : Master Program of Environmental Science, Postgraduate Program of Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/EJES.2021.v15.i01.p02

The Bali Strait is one of Indonesia's territorial waters that have high natural resource potential. The area is only about 2,500 km2 but has a high potential fishing ground. The Bali Strait has unique and dynamic waters that can cause fluctuations in fish production amount each year. The largest type of fish caught in the Bali Strait is lemuru (Sardinella lemuru), a fish found only in the Bali Strait. This fish plays a significant role in the economy of fishers in the Bali Strait. Each year the catch of lemuru has fluctuated, making fishing locations challenging to predict. Sea Surface Temperature (SST) and Chlorophyll-a (Chl-a) are oceanographic parameters that can affect the resources of the ocean. Oceanographic phenomena, such as upwelling, can also influence the condition of fish resources. Therefore, understanding the relationships between these factors is essential in practical fisheries management. Observation of oceanographic factors is very hard with the field observation due to time and cost limitations. The remote sensing technique is an efficient method to determine SST distributions and Chl-a concentrations using satellite imagery. This study analyzes SST and Chl-a concentration in the Bali Strait using the Global Change Observation Mission(GCOM-C) satellite and determines the correlation between Chl-a and SST with a total fish catch(lemuru) during 2019. The results showed the maximum average Chl-a concentration observed on August 1.62 mg/m3 and the lowest concentration observed on January 0.45 mg/m3, the maximum SST on March was 28.12° C, and on August (Dry season) with 22.40° C. The SST variable's influence provides a negative correlation (R = -0.209) with changes in lemuru catch, while the Chl-a parameter has a positive correlation (R = 0.375) with changes in the catch. The pattern of relationship between Chl-a with fish catching had a good relationship than the SST in 2019.Keywords: Bali Strait; Sardinella lemuru; SST; Chl-a.

Aplikasi Sistem Informasi Geografis (SIG) untuk Kajian Banjir di Kota Denpasar NI KOMANG RINI RATNA DEWI; I WAYAN NUARSA; I WAYAN SANDI ADNYANA
Jurnal Agroekoteknologi Tropika (Journal of Tropical Agroecotechnology) Vol.6, No.2, April 2017
Publisher : Program Studi Agroekoteknologi, Fakultas Pertanian, Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (370.825 KB)

Application of Geographic Information System (GIS)For Study of Flood in Denpasar City Denpasar city in general situation has flat area, high rain fall intensity and the dominated landuse of settlement. This condition can reduce the catchment area. This leads Denpasar City become potential for the occurrence of flooding. Therefore, it needs to do research about flood occur in Denpasar.The aim of this research is to find out level of flood vulnerability and it’s spatial distribution in Denpasar. Weighting, scoring and overlay method were used in this research. There are six indicators were analyzed using Geographic Information System (GIS) such as landused, rainfall, type of soil, slope, altitute and drainage density.The result of this research is a map of flood vulnerability in Denpasar City. There are four class of flood vulnerability. Total of the area classified as low, medium, high and very high of flood level are 0,225 hectares (0,002%), 251,73 hectares (2,11%), 4686,7 hectares (38,91%), and 7107,08 hectares or 59% rispectively. Flood vulnerability is spread in entire village in Denpasar City with the varies level. It cause different physical condition area. Low vulnerability level up to medium is spread in North Denpasar Sub-District. High level vulnerability is spread in East Denpasar Sub-District and very high level vulnerability is distributed in West Denpasar and South Denpasar Sub-District.

MONITORING OF LAND USE CHANGES USING AERIAL PHOTOGRAPH AND IKONOS IMAGE IN BEDUGUL, BALI I Wayan Sandi Adnyana; Fumihiko Nishio; Josaphat Tetuko Sri Sumantyo; Gede Hendrawan
International Journal of Remote Sensing and Earth Sciences (IJReSES) Vol 3,(2006)
Publisher : National Institute of Aeronautics and Space of Indonesia (LAPAN)

There was change of expending land use in Bedugul. It is necessary to monito the change of highland of Bali, catchments area of Beratan, Buyan and Tamblingan lakes. In order to control land use change and to anticipate degradation of hydrology function of this area. This study is to monitor the land use change by remote sensing and GIS technique. To evaluate land use and land cover, aerial photograph imagery and Ikonos imagery were used. Over 22 years of observation (1981-2003), there was land use changes in the catchments area of Beratan, Buyan and Tamblingan lakes at Bedugul area. The area of settlement increased by 62.6 ha, dry land vegetable crops and forest decreased by 116.5 ha and 32.5 ha, respectively. The surface area of Buyan Lake was also decreased, due to sedimentation caused by erosion in the vegetables dry land crops. Planning the land use study on erosion and soil-water conservation in this area necessary, in order to control land use change, erosion, and sedimentation in the lakes. Keywords: land use, monitoring, aerial photograph, Ikonos image.

DEVELOPMENT OF THE NEW ALGORITHM FOR MANGROVE CLASSIFICATION I WAYAN NUARSA; I WAYAN SANDI ADNYANA; YASUHIRO SUGIMORI; SUSUMU KANNO; FUMIHIKO NISHIO
International Journal of Remote Sensing and Earth Sciences (IJReSES) Vol 2(2005)
Publisher : National Institute of Aeronautics and Space of Indonesia (LAPAN)

The objective of the study is to develop the algorithm for mangrove classification and density. Regression and correlation analysis was used to perform the equation. CE1 = (0.663*Band 3) + (0.l55 *Band 4) - (l.4*Band 5) + 0.995 And CE2 = 36 * Band 4 + 6*Band 5 + Band 3 were two formula that have been used to classify the mangrove. The object will be classified as mangrove when the value of CE1 is between -31.439 and 0.888, and value of CE2 is greater than or equal to 2000. On the other hand, density of the mangrove was expressed as DE = (2 * Band 4)/(Band 1+Band 3). Mangrove classification result in this study was similar to those of the existing methods. Statistical approach in this study generally gives the higher result tendency than other methods. Key words: Mangrove, Landsat ETM+, Empirical Model, Image Classification

ESTIMATION OF GROSS PRIMARY PRODUCTION USING SATELLITE DATA AND GIS IN URBAN AREA, DENPASAR A.R. As-syakur; T. Osawa; IW.S. Adnyana
International Journal of Remote Sensing and Earth Sciences (IJReSES) Vol 7, No 1 (2010): Vol 7,(2010)
Publisher : National Institute of Aeronautics and Space of Indonesia (LAPAN)

Remote sensing data with high spatial resolution is very useful to provideinformation about Gross Primary Production (GPP) especially over spatial coverage in theurban area. Most models of ecosystem carbon exchange based on remote sensing data usedlight use efficiency (LUE) model. The aim of this research was to analyze the distributionof annual GPP urban area of Denpasar. Two main satellite data used in this study wereALOS/AVNIR-2 and Aster satellite data. Result showed that annual value of GPP usingALOS/AVNIR-2 varied from 0.130 gC m-2 yr-1 to 2586.181 gC m-2 yr-1. Meanwhile, usingAster the value varied from 0.144 gC m-2 yr-1 to 2595.264 gC m-2 yr-1. The annual value ofGPP ALOS was lower than the value of Aster, because ALOS have high spatial resolutionand smaller interval of spectral resolution compared to Aster. Different land use couldeffect the value of GPP, because the different land use has different vegetation type,distribution, and different photosynthetic pathway type. The high spatial resolution of theremote sensing data is crucial to discriminate different land cover types in urban region.With heterogeneous land cover surface, maximum value of GPP using ALOS/AVNIR-2was smaller than that of Aster, however, the annual mean of GPP value usingALOS/AVNIR-2 was higher than that of Aster.

ANALISIS KELIMPAHAN MIKROPLASTIK PADA BIVALVIA DI PERAIRAN TUMINTING DAN MALALAYANG KOTA MANADO Nikita Ribka Kawung; I Wayan Sandi Adnyana; I Gede Hendrawan
ECOTROPHIC : Jurnal Ilmu Lingkungan (Journal of Environmental Science) Vol 16 No 2 (2022)
Publisher : Master Program of Environmental Science, Postgraduate Program of Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/EJES.2022.v16.i02.p09

Microplastic as a marine debris is currently become a global problem. Tuminting and Malalayang coasts as the study case in this research because these places were located in the high population and anthropogenic activity areas, that allowing the microplastic pollution. The goal of this research are to identify the types of microplastic, to analyze the abundance of microplastic and to evaluate the differences accumulation of microplastic in bivalve from Tuminting and Malalayang, Manado. This research is used a purposive sampling method. The analysis of microplastic in bivalves following C. M. Boerger et al. (2010) methods. The average of microplastic for the three species of bivalve in Tuminting for Cardidae sp. Was 5.75 particles/g, Venridae sp. 17.05 particles/g and Mytilidae sp. 130.06 particles/g, while in the three species of bivalve in Malalayang for Cardidae sp. 50.87 particles/g, Venridae sp. 9.56 particles/g and Mytilidae sp. 6.93 particles/g. Based on Kruskal Wallis analysis for bivalve of Tuminting is 0.087; Malalayang 0.616. The bivalve morphometric correlation test using Spearman Rank analysis showed a result 0.05 for Tuminting and 0.187 for Malalayang. The microplastics types that found in bivalve are fragments, films, fibers, foam, pellets, granules and the highest one is fiber. In this study, abundance of microplastic in bivalve from Tuminting also Malalayang waters, were found so it was necessary to disseminate this information to the public about the dangers of plastic. There must be a government regulations regarding the coastal area management related to garbage waste and have to make another research about the identification of the chemical that containing in microplastic in bivalves. Keywords: marine debris; microplastics; bivalve; manado

PENGELOLAAN HUTAN MANGROVE BERBASIS MASYARAKAT DI DESA BUDENG, KECAMATAN JEMBRANA, KABUPATEN JEMBRANA Ujang Rija Ginanjar; I Wayan Sandi Adnyana; I Made Sudarma
ECOTROPHIC : Jurnal Ilmu Lingkungan (Journal of Environmental Science) Vol 16 No 2 (2022)
Publisher : Master Program of Environmental Science, Postgraduate Program of Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/EJES.2022.v16.i02.p02

The mangrove forest in Budeng Village is managed by local communities by forming farmer groups. The interaction of the people of Budeng Village in mangrove management, this will determine the sustainability of the mangrove area in the future. It is necessary to have the right strategy in mangrove management by following the rules of balance and sustainability. The purpose of this study is to analyze changes in mangrove forest cover, find out the perception and participation of the community in mangrove forest management and develop an ideal mangrove forest management strategy. Data collection includes using literal studies, observations, questionnaires and Forum Group Discussion. Samples in this study was 30 people. Data analysis was performed using SWOT matrix and QSPM matrix. The condition of mangrove forests in Budeng Village is relatively good, there is an increased in mangrove forest cover covering an area of 36 ha in the period from 2016 to 2021. The level of community perception in mangrove forest management excellent categories and the level of community participation is in high categories. The general strategy on mangrove forest management in Budeng Village is growth strategy. Based on the results of the SWOT analysis, there are 14 alternative strategies for mangrove forest management in Budeng Village with a priority strategy based on the results of the Total Attractiveness Score calculation is to increase the role and commitment of local governments in mangrove forest management in Budeng Village. Keywords: mangroves; perception; participation; strategy; management

PREDIKSI EROSI DAN PERENCANAAN KONSERVASI TANAH DAN AIR DI DAERAH ALIRAN SUNGAI PAKERISAN PROVINSI BALI Ni Wayan Suprianingsih; I Wayan Sandi Adnyana; I Wayan Diara
ECOTROPHIC : Jurnal Ilmu Lingkungan (Journal of Environmental Science) Vol 17 No 1 (2023)
Publisher : Master Program of Environmental Science, Postgraduate Program of Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/EJES.2023.v17.i01.p06

Pakerisan watershed is one of the watershed that has not followed the rules of soil and water conservation. This can destroy soil aggregates and cause high erosion. This study aims to predict the level of erosion and to plan soil and water conservation. Erosion prediction uses the USLE (Universal Soil Loss Equation). The prediction erosion showed that erosion is classified from slight to severe. The erosion rate is very light covering an area of 6,426.26 ha (71.28%) with natural forests, dryland agriculture, and paddy fields. The moderate erosion rate is 583.83 ha (6.48 %) on dryland and paddy fields farming. The severe erosion rate is 1,087.99 ha (12.07%) on land use in the form of dryland agriculture. The very severe erosion covering an area of 916.85 (10.17%) with the use of dryland agriculture. Conservation planning can be carried out by increasing vegetation density, adding mulch and conservation measures of making terraces with good construction. Keywords: Soil; Prediction Erosion; Conservation; Watershed

ANALISIS KELAYAKAN EKONOMI PENGOPERASIAN SISTEM PENYEDIAAN AIR MINUM (SPAM) DI PULAU NUSA PENIDA - KABUPATEN KLUNGKUNG Ariantana, Ketut; Sudiana Mahendra, Made; Nuarsa, I Wayan; Adnyana, I Wayan Sandi; Kastini Adiputri, Ni Made
ECOTROPHIC : Jurnal Ilmu Lingkungan (Journal of Environmental Science) Vol 17 No 2 (2023)
Publisher : Master Program of Environmental Science, Postgraduate Program of Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/EJES.2023.v17.i02.p03

Water is the most basic need for living things, it follows population growth and development activities as in Nusa Penida Island. The water supply on this island comes from SPAM Penida and SPAM Guyangan. The Central and Provincial Governments of Bali provide operational subsidies of more than 7 billion on average. Perumda Panca Mahottama’s services also can’t cover all villages on this island. It means SPAM management is not yet economical, and the service is not optimal. The purpose of this economic feasibility analysis is to determine the economic feasibility of SPAM in terms of Full Cost Recovery and appropriate tariffs so that operational costs are proportional to income. To determine the economic feasibility conditions, a study was conducted to evaluate the value of current tariff (2021). The result is Opex value is bigger than the income value. This results in a NCF value of (-Rp.2,610,621,409.00). The operational cost is IDR.7,164,857,259.00/year with total production 1,530,362.88m3/year. The FCR value obtained was IDR.4,681.80/m3. The average production cost is IDR.2,975.92/m3, which means there will still be a loss in 2021 of IDR1,705.99/m3. Analysis was conducted based on the trial error method with calculation period of 15 years, with 3 different tariff systems, alternative 1, tariff with the same value IDR.4,100/m3 from 2023 to 2036, alternative 2 tariff is IDR.3,500 in 2023 to 2027 increase by IDR.1,000/m3 in 2028 to IDR.4,500/m3 until 2036. Alternative 3 tariff is IDR.3,000/m3 in 2023 increase by IDR.500/m3 in 2024 to 2026 and settled at a rate IDR.4,500/m3 until 2036. Keywords: SPAM; feasibility; economy; tariff

MONITORING OF LAND USE CHANGES USING AERIAL PHOTOGRAPH AND IKONOS IMAGE IN BEDUGUL, BALI I Wayan Sandi Adnyana; Fumihiko Nishio; Josaphat Tetuko Sri Sumantyo; Gede Hendrawan
International Journal of Remote Sensing and Earth Sciences Vol. 3 (2006)
Publisher : BRIN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30536/j.ijreses.2006.v3.a1206

There was change of expending land use in Bedugul. It is necessary to monito the change of highland of Bali, catchments area of Beratan, Buyan and Tamblingan lakes. In order to control land use change and to anticipate degradation of hydrology function of this area. This study is to monitor the land use change by remote sensing and GIS technique. To evaluate land use and land cover, aerial photograph imagery and Ikonos imagery were used. Over 22 years of observation (1981-2003), there was land use changes in the catchments area of Beratan, Buyan and Tamblingan lakes at Bedugul area. The area of settlement increased by 62.6 ha, dry land vegetable crops and forest decreased by 116.5 ha and 32.5 ha, respectively. The surface area of Buyan Lake was also decreased, due to sedimentation caused by erosion in the vegetables dry land crops. Planning the land use study on erosion and soil-water conservation in this area necessary, in order to control land use change, erosion, and sedimentation in the lakes.

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