Thermal Dispersion Model of Water Cooling Pltgu Cilegon Ccpp Discharge Into Margasari Coastal Waters at the Western Coast of Banten Bay

Thermal dispersion model based on the hydrodynamics model was applied on PLTGU Cilegon (electric power industry based on gas and steam) at the coast of Margasari, Pulo Ampel District, Serang-Banten. This PLTGU used around 60.000 mP3P/hour of seawater as cooling water system. Therefore, it produced water with high temperature of about 5 PoPC higher than the sourounding of seawater temperature. This high water temperature was flowed out into the coastal waters. This study tried to predict their distribution according to southeast and northeast monsoon. Model verification was conducted both to hydrodynamics component (tide and current) and water temperature. The verification results show good enough patterns between the model results and field measurement

Analisis Sensitivitas Lingkungan Oscp (Oil Spill Contingency Plan) Di Pesisir Selatan Delta Mahakam, Provinsi Kalimantan Timur

The research was one part of oil spill contingency plan (OSCP) developed for Delta Mahakam area, where oil & gas exploration and exploitation linked with rich biodiversity supporting coastal community livelihood. Environmental sensitivity analysis for OSCP only do two early stages of OSCP scope, which integrated with the dangers of coastal vulnerability. This analysis mapped environmental component from oil pollution become sensitivity rangking as an effort to support response development strategies and priorities for the coastal resources protection. The aims of this research were (1) to establish environment sensitivity rank and (2) to identify primary factor supporting the environmental sensitivity for OSCP in south Delta Mahakam area. The result of analysis showed environmenal sensitivity was 62.37% (517.52 km), its mean very high sensitivity. Then the high sensitivity criteria was 11.31% (94 km). The criteria of medium sensitivity was 11.92% (99 km). While for low sensitivity and very low sensitivity respectively were 1.78% (15 km) and 12.64% (105 km). Based on Principal Component Analysis (PCA), 36.01% variability was explained by axis of factor 1. The others variability 18.53% and 13.93% were explained by axis of the factor 2 and factor 3. Axis of factor 1 for coastal exposure (EK), oil residence index (OR), coastal type (TP), and biological resources (SH) had a quite large linear combinations coefficient, amounted to 0.94 (EK&OR), 0.83 (TP) and 0.75 (SH). This indicated a very high contribution for environmental sensitivity OSCP level drafting. On axis of factor 2, the linear coeffisien combinations for the resource utilization of port (PL) was 0.83 and settlement (PM) was 0.85. Axis of factor 3 contributed 0.75 and 0.66 on migas platform (PO) and placement of passive fishing gear/catchment area (AT). However, the utilization of coastal resources for PL, PM, PO and AT were on axis of factor 2 and factor 3 had a considerable distance with its SI variable. This possible caused by each variable percentage distribution which the value was very minor ranged 0.001-0.52%, so its not representated coastal resources elements closeness with SI variable in the study area

Tidal Range Calculation Based on the Local Knowledge of the Sama Ethnic Group in the Eastern Indonesia

The Sama ethnic group (Bajo) is well known as “Indonesian marine people” that dominantly spreaded in coastal region of eastern Indonesian region. Their activities have been adapting with the territorial water as shown in the determination of their home floor height to prevent from the tidal flood. The purpose of this study was to examine the accuracy of the tidal range calculation by local knowledge of the Sama ethnic group (Sama Ethnic Method, SEM). The analysis was done by comparing tidal range result calculated by the Sama Ethnic Method (SEM) with the standardized tidal harmonic constituents. The result showed that the 2nd tidal peaks (DLB-s) in the 15th “Sya'ban” date was the best date to do measurement of a tidal range. In this case, the “Likkas Silapas” (LS) value at the above date was above the mean height water level (MHWL). Meanwhile, in other dates, the LS value was under MHWL value. The result also showed a strong correlation (R2> 90%) between rasio of tidal high on 1st and 2ndpeaks (DLB-s/DLB-m) on 15th Sya'ban date and LS-s value. The local knowledge of the Sama Ethnic Method to determine the tidal range was effective and scientifically proven

Distribution and Behaviour of Dissolved and Particulate Pb and Zn in Jeneberang Estuary, Makassar

Dissolved and particulate heavy metals play a role in geochemical cycle as an agent in adsorption-desorption, deposition-resuspension, and dispersion mechanisms of heavy metals in water environment. The objectives of this research were to determine the distribution and behaviour of dissolved and particulate heavy metals Pb and Zn in different seasons (west and east seasons) at Jeneberang Estuary of Makassar. Concentrations of Pb and Zn were analysed using Atomic Adsorption Spectrophotometry based on APHA, AWWA, WEF (2005). The concentration of dissolved Pb in the riverine, estuarine, and marine waters were in the range (average) of <0.002 mg/L (below detectable limit), 0.013-0.144 mg/L (0.047 mg/L), 0.016-0.198 mg/L (0.079 mg/L); and the concen-tration of dissolved Zn were in the range (average) of <0.002 mg/L (below detectable limit), <0.002-0.014 mg/L (0.005 mg/L), <0.002-0.083 mg/L (0.017 mg/L). Meanwhile, the concentration of parti-culate Pb were in the range (average) of 1.807-2.569 mg kg-1 (2.215 mg kg-1), 0.521-1.272 mg kg-1 (0.911 mg kg-1), 0.465-2.182 mg kg-1 (1.033 mg kg-1), and the concentration of particulate Zn were in the range (average) of 19.151-90.942 mg kg-1 (51.710 mg kg-1), 16.999-63.059 mg kg-1 (31.694 mg kg-1), 19.439-80.283 mg kg-1 (45.554 mg kg-1) in the riverine, estuarine and marine waters, respecti-vely. Behaviour of dissolved heavy metals Pb and Zn showed that the concentrations tended to increase (desorption) along the gradient of high salinity as a result of the higher heavy metals input from coastal region than that riverine regimes

Observation of Coastal Front and Circulation in the Northeastern Java Sea, Indonesia

The structure and spatial extent of a coastal front and circulation in the shallow (<55 m depth) northeastern Java Sea in Indonesia was investigated with a new dataset of high-resolution conductivity-temperature-depth (CTD) and along-track shipboard acoustic Doppler current profiler (SADCP) during a DIKTI-LIPI 2010 joint research cruise on R.V. Baruna Jaya 8. The coastal front separates fresh warm coastal water derived mainly from Barito River discharge and the saline, cool Java Sea water. The surface fresh water plume extends approximately 760 km from the Barito River estuary to the south, and its thickness varies from the surface to 10 m and 20 m depth, depending on its proximity to the fresh water source. The front is aligned a northeast and east direction, probably related to a meandering of strong northeastward monsoon current in the eastern part of the Java Sea during the observation time

Morphoregression and Length-weight Relationship of Bali Sardinella, Sardinella Lemuru Bleeker 1853 in Bali Strait Waters

Bali Sardinella, Sardinella lemuru Bleeker 1853, included in small pelagic groups which have an important economic value. The production of Bali Sardinella was the highest among the other small pelagic fish in Bali Strait waters. The morphoregression and length-weight relationship are important to be known to facilitate the conversion between a length measurement to another type of length measurement and the weight. The aims of this research were to reveal the relationship between total length (TL) and standard length (SL), total length and fork length (FL), fork length and standard length, and the length-weight. The research was held in Bali Strait waters from March 2017 – Mei 2018. The morphoregression was analyzed using simple linear regression, whereas the length-weight relationship using power regression. A total of 470 individuals of Bali sardinella were collected during the study period. The fish that analyzed have a length range 9.7 –20.2 cm TL. The average length of Bali sardinella was13.7 cm. The relationship between total length (TL) and standard length (SL); total length (TL) and fork length (FL); fork length (FL) and standard length (SL) for Bali sardinella respectively were TL = 1.1038SL + 0.9313; TL = 1.0861FL + 0.2967; and FL = 1.0068SL + 0.6936, respectively. The value of b which were generated from the length-weight relationship of Bali Sardinella was 3.22 with the growth patterns were positive allometric

Food and Feeding Habit of Bali Sardinella, Sardinella Lemuru Bleeker, 1853 in Bali Strait Waters

Ikan lemuru (Sardinella lemuru Bleeker, 1853) adalah salah satu tangkapan utama nelayan di sekitar Selat Bali. Beberapa faktor yang disinyalir menjadi penyebab turunnya produksi ikan ini adalah upaya tangkap yang tidak terkelola baik pada masa lalu dan belum adanya batas ukuran yang boleh ditangkap. Selain faktor penangkapan tersebut, faktor lingkungan juga diduga berperan, misalnya ketersediaan makanannya. Penelitian ini bertujuan untuk mengungkapkan makanan dan kebiasaan makan ikan lemuru di perairan Selat Bali dan keterkaitannya dengan ketersediaan pakan alaminya di alam. Penelitian berlangsung selama 13 bulan, sejak Mei 2017-Mei 2018 di tiga area di perairan selat Bali, yaitu Pengambengan, Pekutatan, dan Yeh Leh. Organisme yang ditemukan di dalam saluran pencernaan ikan diidentifikasi hingga tingkat genera. Untuk kebiasaan makanan ikan, metode yang digunakan adalah Indeks Penting Relatif (IPR). Sementara itu, metode yang digunakan untuk menentukan makanan yang dipilih ikan adalah Indeks Pilihan Jenis Makanan. Berdasarkan nilai IPR, organisme makanan yang nilainya paling tinggi adalah dari kelas Cyanophyceae (Trichodesmium) dan Bacillariophyceae (Nitzshia dan Chaetoceros). Organisme yang paling banyak dimakan berubah-ubah bergantung kepada musim dan ukuran ikan. Lemuru adalah ikan planktivora dan memilih makanannya. Plankton yang melimpah di perairan belum tentu ditemukan dalam jumlah yang banyak dalam saluran pencernaannya

Study of Shoreline Changes at Jeneberang River Delta, Makassar

The study of shoreline changes during 1990 - 2008 in the delta of the River Jeneberang, Makassar was conducted by evaluating sediment transport into and out of a cell. Longshore sediment transport was computed by considering the influence of heights and angles of the breaking waves. Results of calculation of sediment transport showed that the dominant of sediment transport was to the north during the arrival of the southwest and west waves, and to the south when the wave coming from the northwest. Comparison between shore profiles resulting from model and coastline satellite imagery showed similarity. The difference between the two tend to be occurred at the head land part of the shoreline. This was due to complexity of coastal dynamic at the area. The results of the 19 years shoreline simulation showed that there was a tendency of abrasion at the upsteam head land part as the wave energy tend to converge and accretion at the bay part as the wave energy tend to diverge. Abrasion mainly occurred at Tanjung Bunga (head land) where the coast retreat 181.1 m. Accretion occur in the bay area (Tanjung Merdeka) where the coast advance to the sea for about 59.8 m. The shoreline tend to be stable when the profile was straight such as Barombong Coast