scholarly journals ANALISIS KELAYAKAN LOKASI BUDIDAYA METODE KARAMBA JARING APUNG DI PERAIRAN DESA PULAU HARAPAN SINJAI

2019 ◽  
Vol 2 (1) ◽  
pp. 1-5
Author(s):  
Abdul Razak Yunus ◽  
Sutia Budi ◽  
Suryawati Salam
Keyword(s):  
Dissolved Oxygen ◽  
Wave Height ◽  
Temperature Wave ◽  
Current Speed ◽  
Water Ecosystem ◽  
Water Based ◽  
Aquaculture Development ◽  
Area Of Study

Penelitian ini bertujuan menganalisis tingkat kesesuaian perairan berdasarkan data parameter ekosistem perairan, mengetahui lokasi yang cocok untuk dikembangkan budidaya ikan kerapu dengan sistem karamba jaring apung yang berkelanjutan berdasarkan data parameter perairan yang meliputi kedalaman, kecerahan, kecepatan arus, salinitas, suhu, tinggi gelombang, derajat keasaman (pH) dan oksigen terlarut dianalisis berdasarkan posisi koordinatnya. Hasil yang didapatkan Pada kelas S1, kawasannya mencakup area seluas ± 467.898,82 m2 atau sebesar 26,47 % dari total kawasan yang menjadi area studi. Kelas S2 mencakup area seluas ± 725.217,09 m2 atau sebesar 41,03 % dari luas kawasan yang menjadi area studi dari luas total perairan dan kelas S3, kawasannya mencakup area seluas ± 574.609,54 m2 atau sebesar 32,51 % dari total kawasan yang menjadi area studi.   This study aims to analyze the suitability of water based on water ecosystem parameter data, find out suitable locations for grouper aquaculture development with a sustainable floating net karamba system based on water parameter data which includes depth, brightness, current speed, salinity, temperature, wave height, degree of acidity (pH) and dissolved oxygen are analyzed based on the position of the coordinates. The results obtained in the S1 class, the area covers an area of ??± 467,898.82 m2 or as much as 26.47% of the total area of ??study area. Class S2 covers an area of ??± 725,217.09 m2 or 41.03% of the area of ??the study area of ??the total area of ??waters and class S3, the area covers an area of ??± 574,609.54 m2 or 32.51% of the total area be a study area.

Detection Method of Dissolved Oxygen Concentration in Water Based on Single Source Frequency Domain Fluorescence Lifetime

2020 ◽  
Vol 49 (3) ◽  
pp. 330002-330002
Author(s):  
陈朋 Peng CHEN ◽  
赵智 Zhi ZHAO ◽  
赵冬冬 Dong-dong ZHAO ◽  
韩洋洋 Yang-yang HAN ◽  
梁荣华 Rong-hua LIANG
Keyword(s):  
Dissolved Oxygen ◽  
Frequency Domain ◽  
Oxygen Concentration ◽  
Fluorescence Lifetime ◽  
Detection Method ◽  
Single Source ◽  
Dissolved Oxygen Concentration ◽  
Water Based

Tow Forces for Emergency Towing of Containerships

2015 ◽  
Vol 137 (5) ◽  
Author(s):  
Vladimir Shigunov ◽  
Thomas E. Schellin
Keyword(s):  
Wave Height ◽  
Current Speed ◽  
Sea Waves ◽  
Wave Direction ◽  
Equilibrium Equations ◽  
Significant Wave ◽  
Wind Speeds ◽  
Time Average ◽  
Wave Drift Forces ◽  
Drift Forces

For a series of five containerships of differing capacities (707, 3400, 5300, 14,000, and 18,000 TEU), systematic computations were performed to estimate the tow force required in an emergency. Time-average ship positions with respect to the given waves, wind, and current directions and the corresponding time-average forces were considered. Current speed was considered to include also towing speed. Directionally aligned as well as not aligned wind and waves were investigated. Wave height, wind speed, and wave and wind direction relative to current direction were systematically varied. Wind speeds based on the Beaufort wind force scale corresponded to significant wave heights for a fully arisen sea. Waves were assumed to be irregular short-crested seaways described by a Joint North Sea Wave Observation Project (JONSWAP) spectrum with peak parameter 3.3 and cosine squared directional spreading. For each combination of current speed, wave direction, significant wave height, and peak wave period, the required tow force and the associated drift angle were calculated. Tow force calculations were based on the solution of equilibrium equations in the horizontal plane. A Reynolds-Averaged Navier–Stokes (RANS) solver obtained current and wind forces and moments; and a Rankine source-patch method, drift forces and moments in waves. Tow forces accounted for steady (calm-water) hydrodynamic forces and moments, constant wind forces and moments, and time-average wave drift forces and moments. Rudder and propeller forces and towline forces were neglected.

Tow Forces for Emergency Towing of Containerships

2014 ◽  
Author(s):  
Vladimir Shigunov ◽  
Thomas E. Schellin
Keyword(s):  
Wave Height ◽  
Hydrodynamic Forces ◽  
Current Speed ◽  
Sea Waves ◽  
Wave Direction ◽  
Equilibrium Equations ◽  
Significant Wave ◽  
Wind Speeds ◽  
Time Average ◽  
Drift Forces

For a series of five containerships of differing capacities (707, 3400, 5300, 14000 and 18000 TEU) systematic computations were performed to estimate the tow force required in an emergency. Time-average ship positions with respect to the given waves, wind and current directions and the corresponding time-average forces were considered. Current speed was considered to include also towing speed. Directionally aligned as well as not aligned wind and waves were investigated. Wave height, wind speed, and wave and wind direction relative to current direction were systematically varied. Wind speeds based on the Beaufort wind force scale corresponded to significant wave heights for a fully arisen sea. Waves were assumed to be irregular short-crested seaways described by a JONSWAP spectrum with peak parameter 3.3 and cosine squared directional spreading. For each combination of current speed, wave direction, significant wave height and peak wave period, the required tow force and the associated drift angle were calculated. Tow force calculations were based on the solution of equilibrium equations in the horizontal plane. A RANS solver for current and wind forces and a Rankine source-patch method for drift forces in waves computed hydrodynamic forces and moments. Tow forces accounted for steady (calm-water) hydrodynamic forces and moments, constant wind forces and moments, and time-average wave drift forces and moments. Rudder and propeller forces and towline forces were neglected.

Detection Method of Dissolved Oxygen Concentration in Water Based on Time-Domain Fluorescence Lifetime

2018 ◽  
Vol 38 (10) ◽  
pp. 1001005 ◽  
Author(s):  
涂梦迪 Tu Mengdi ◽  
殷高方 Yin Gaofang ◽  
赵南京 Zhao Nanjing ◽  
覃志松 Qin Zhisong ◽  
王翔 Wang Xiang ◽  
...  
Keyword(s):  
Dissolved Oxygen ◽  
Oxygen Concentration ◽  
Fluorescence Lifetime ◽  
Time Domain ◽  
Detection Method ◽  
Dissolved Oxygen Concentration ◽  
Water Based

scholarly journals Identifikasi Lokasi Perairan Untuk Pengembangan Budidaya Laut di Kabupaten Lombok Utara

2018 ◽  
Vol 18 (1) ◽  
pp. 57
Author(s):  
M. Junaidi, Nurliah, M.Marzuki, Nunik Cokrowati, Ibadur Rahman
Keyword(s):  
Water Quality ◽  
Decision Making ◽  
Data Collection ◽  
Marine Aquaculture ◽  
The North ◽  
Water Based ◽  
Aquaculture Development

AbstrakPenelitian ini bertujuan mengidentifikasi lokasi perairan untuk pengembangan budidaya laut di Kabupaten Lombok Utara. Pengumpulan data kondisi biofisik perairan yang mencakup aspek kualitas perairan dan oseanografi yang merupakan data penunjang bagi pengambilan keputusan kesesuaian biofisik pengembangan budidaya laut.Identifikasi lokasi perairan untuk budidaya laut menuntut penerapan beberapakriteria. Penerapan kriteria sangat membantu dalam mengidentifikasi dan memilihlokasi budidaya secara obyektif, dimana secara mendasar terdiri dari atas kelompok kriteria kesesuaian kualitas air dan oseanografi. Hasil  identifikasi lokasi perairan berdasarkan aspek oseanografi dan kualitas perairan, maka perairan Kabupaten Lombok Utara terutama di Kecamatan Tanjung dan Gangga sangat sesuai untuk pengembangan budidaya laut, terutama komoditas yang memiliki peluang ekspor tinggi seperti kerapu, rumput laut dan  kerang mutiara.Kata kunci : identifikasi, lokasi perairan, budidaya laut, pengembangan Abtract               This study aimed to identify the location of the waters for mariculture development in North Lombok regency.The data collection biophysical conditions of waters which includes aspects of water quality and oceanographic constitute supporting data for decision making biophysical suitability of mariculture development.Identify the location of the waters for mariculture requires the application of several criteria.The application of the criteria is very helpful in identifying and selecting the location of cultivation in an objective, which is basically composed of the top group suitability criteria for water quality and oceanographic. Results of identifying the location of water based on aspects of oceanography and water quality, the waters of the North Lombok, especially in the district of the Tanjung  and the Ganga is very suitable for the development of marine aquaculture, especially commodities which have high export opportunities such as grouper, seaweed and pearl shells.Keywords: identification, location waters, aquaculture, development

scholarly journals Water Quality Status of Tono and Vea Reservoirs for Aquaculture Development in the Upper East Region of Ghana

2019 ◽  
pp. 1-14
Author(s):  
Etornyo Agbeko ◽  
Nelson W. Agbo ◽  
Thomas K. Agyemang ◽  
Daniel Adjei-Boateng
Keyword(s):  
Water Quality ◽  
Dissolved Oxygen ◽  
Anthropogenic Activities ◽  
Ecosystem Dynamics ◽  
Total Hardness ◽  
Reservoir Water ◽  
East Region ◽  
Water Quality Variable ◽  
Upper East Region ◽  
Aquaculture Development

Understanding aquatic ecosystem dynamics is fundamental to sustainable development of aquaculture. This study explores the water quality characteristics over temporal and spatial scale in Tono and Vea Reservoirs in the Upper East Region of Ghana for aquaculture development. Water samples and in-situ measurements were taken for fifteen months, from February 2015 to March 2016. Monthly water quality monitoring were based on stratified sampling from upstream, midstream and downstream zones of these reservoirs. Standard analytical methods for examination of water were employed during sampling and laboratory analysis of reservoir water quality. Phytoplankton analysis was done using light microscopy to obtain phylum abundance. Multivariate statistical methods were used to investigate water quality dataset obtained. Cluster analysis grouped fifteen months of water quality changes into three seasonality regimes (periods) based on temporal variation. Principal component analysis (PCA) reduced eighteen water quality variables into five and three factors with total variance of 88.26 % and 79.30% for Tono and Vea reservoirs, respectively. With pH > 7 and alkalinity > 20 but < 100 mg L-1 CaCO3, both reservoirs have alkaline water. Dissolved oxygen was > 5 mg L-1. Three phyla of phytoplankton were identified with dominant (in abundance) phylum as Chlorophyta (72%) occurring in Tono reservoir. To understand the spatial relationship using correspondence analysis (CA), the first axis of CA explained 84.2% and 64.3% of total variation in relative abundance of phytoplankton phyla for Tono and Vea reservoirs, respectively. Thus, Cyanophyta showed strong positive association with conductivity, total hardness, nitrate, sulphate, turbidity, water depth and dissolved oxygen which were responsive to the midstream and upstream zones of Tono reservoir. Whiles in Vea reservoir, Chlorophyta under same water quality variable showed responsiveness to the midstream and downstream zones. Reservoir water quality studied were within acceptable limits for fish culture but changes could be linked to anthropogenic activities on reservoir catchment area and seasonality regime. Results from this provide a baseline to enable information to enable assessment of aquaculture impact in Tono and Vea reservoirs. The use of multivariate analysis could be a reliable statistical method for assessing water quality on a spatio-temporal scale.

Marine Fish Cages—The Physical Environment

1976 ◽  
Vol 75 (4) ◽  
pp. 207-221 ◽  
Author(s):  
A. Edwards ◽  
D. J. Edelsten
Keyword(s):  
Dissolved Oxygen ◽  
Oxygen Concentration ◽  
Marine Fish ◽  
West Coast ◽  
Physical Environment ◽  
Stocking Density ◽  
Current Speed ◽  
Low Oxygen ◽  
Fish Stocking ◽  
Small Areas

SYNOPSISThe distributions of the four variables—temperature, salinity, currents and dissolved oxygen—are discussed with particular reference to the Scottish west coast. In fjords, the distributions are related to the sources of change—tides, freshwater runoff, winds and, in the case of currents, to friction, which makes currents very variable over small areas. Current speed in floating cages has been found less than that outside. A model of the oxygen concentration in such a cage has been used to examine the conditions of current and fish stocking density under which the cage can be operated without reaching dangerously low oxygen concentrations.

scholarly journals KANDUNGAN BAHAN ORGANIK SEDIMEN DAN KADAR H2S AIR DI DALAM DAN DI LUAR TEGAKAN MANGROVE DESA BEDONO, KABUPATEN DEMAK

2018 ◽  
Vol 7 (1) ◽  
pp. 78-85
Author(s):  
Halimatus Sa’diyah ◽  
Norma Afiati ◽  
Pujiono Wahyu Purnomo
Keyword(s):  
Organic Matter ◽  
Dissolved Oxygen ◽  
Water Temperature ◽  
Organic Material ◽  
Organic Materials ◽  
Current Speed ◽  
Survey Method ◽  
Water Sampling ◽  
Mangrove Area ◽  
Surrounding Environment

Kawasan mangrove dapat memproduksi bahan organik dari proses dekomposisi serasah yang jatuh yang menjadi penyuplai nuterien ke lingkungannya. Proses tersebut menggunakan oksigen terlarut yang apabila oksigen terlarut habis maka proses tersebut beralih ke proses dekomposisi secara anaerob yang menyebabkan terbentuknya senyawa H2S. Penelitian ini bertujuan untuk mengetahui perbedaan kandungan bahan organik sedimen dan kadar H2S air di dalam dan di luar kawasan mangrove serta untuk mengetahui hubungan kandungan kadar H2S air dengan bahan organik sedimen dan oksigen terlarut di kawasan mangrove desa Bedono. Metode penelitian adalah metode survey. Penelitian ini dilakasanakn pada bulan Mei- Juni 2017 di lokasi yang mewakili kawasan mangrove dan lingkungan sekitarnya. Data yang diukur adalah suhu air, kecerahan, kedalaman, kecepatan arus, oksigen terlarut, pH, bahan organik sedimen dan H2S air yang dilaksanakan empat kali dengan selang pengukuran dua minggu. Hasil yang didapat yaitu suhu air 28-31oC, kecerahan 14,5-68 cm, kedalaman 33-165 cm, kecepatan arus 0-0,1 m/s, oksigen terlarut , pH 5-6, bahan organik sedimen 7,73-20,27%, H2S air 0,003-0,037 mg/l. Kandungan bahan organik sedimen dan kadar H2S air tertinggi di dalam kawasan mangrove dengan rata-rata 16,36% dan 0,031 mg/l, dan terendah di luar kawasan mangrove dengan rata-rata 9,78% dan 0,01 mg/l. Kadar H2S tinggi di dalam kawasan mangrove dan lebih rendah di luar kawasan mangrove. Kadar H2S air dengan bahan organik sedimen dan oksigen terlarut berhubungan linier dengan persamaan H2S= 0,027 + 0,001BOS- 0,006 DO (r= 0,7246, BOS= Bahan Organik Sedimen, DO= Dissolved Oxygen). Mangroves produce organic matter from the decomposition of falling leaves, twigs etc, which supply nutrient to the environment. The process uses dissolved oxygen; when dissolved oxygen exhausted, it switches into anaerobic decomposition which causes the formation of H2S compounds. This study aims to knowing differences in sediment organic materials and H2S within and adjacent of mangrove areas and to determine the relation of H2S with sediment organic materials and dissolved oxygen in the mangrove areas of Bedono. Survey method is refered, and the study was conducted in May - June 2017 on locations representing mangrove areas and the surrounding environment. The data measured are water temperature, brightness, depth, current speed, dissolved oxygen, pH, sediment organic materials and H2S in the water. Sampling was conducted four times every fortnight. The result of the water temperature is  28-31 ° C, brightness 14.5 to 68 cm, 33-165 cm depth, current speed 0-0.1 m/s, dissolved oxygen 2-5,2 mg/l, pH 5-6, sediment organic material 7,73 to 20.27%, H2S 0.003 to 0.037 mg/l. Sediment organic materials and H2S were highest within the mangrove area, with an average 16.36% and 0.031 mg/l, and the lowest outside of mangrove area with an average 9.78% and 0.01 mg/l. H2S higher in the inside of  the mangrove areas compared to the outside of it. The relation of H2S with sediment organic materials and dissolved oxygen is linearly related according to the equation H2S= 0.027+ 0.001SOM- 0.006DO (r= 0.7246, SOM= Sediment Organic Materials, DO= Dissolved Oxygen).

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