Dissolved oxygen––a target indicator in determining use of the Gulf of Kachchh waters

Desa, E.; Zingde,; Vethamony, P.; Mt, Babu; Sn, D'Sousa; Xn, Verlecar

doi:10.1016/j.marpolbul.2004.08.014

Cited by 24 publications

(11 citation statements)

References 4 publications

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“…The results during both AFW and HWF are in agreement with (Gandaseca et al, 2011). Desa et al (2005) indicated that on the whole the average BOD5 is higher during post-monsoon compared to pre-monsoon values. As productivity is higher during monsoon season there will be an increase in dead organic matter in the water column, resulting in higher BOD.…”

Section: Bod and Cod Concentrationssupporting

confidence: 83%

Validation of MIKE 11 Model Simulated Data for Biochemical and Chemical Oxygen Demands Transport

Eisakhani

Abdullah²,

Karim³

et al. 2012

American Journal of Applied Sciences

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Problem statement:The aim of the study was to model the discharge, Biochemical and Chemical Oxygen Demands (BOD and COD) loads in each cross section of Bertam River in Cameron Highlands, Malaysia. Cameron Highlands form the headwater catchment for two major rivers of the lowlands; Pahang River and Perak River. On the other hand, Cameron Highlands is undergoing rapid development as a popular tourist destination and an area exploited for growing of temperature vegetables, fruits and flowers. It is also a mountainous area subjected to torrential tropical showers. The condition of Bertam River as one of the main rivers in Cameron Highlands has degraded over the years in terms of water pollution and river environment. Approach: Therefore, MIKE 11 a onedimensional hydrodynamic simulation program was utilized to model stream flow transport and water quality processing in the river system. The model was used to generate the river outflow and simulate BOD and COD concentrations in each cross section of Bertam River. Hydrodynamic Module (HD) which uses an implicit, finite difference solver was applied to calculate water level and flow for the river. Next, Rainfall-Runoff Module (RR) which is include unit hydrograph method and lumped conceptual continuous hydrological model was used to combine the meteorological data of the study area to MIKE 11 simulation system. Finally, Advection-Dispersion Module (AD) was used for transported BOD and COD concentrations calculation. Results: Water quality results show the BOD 5 varies from 1-2 mg L −1 during pre-monsoon and from 4-10 mg L −1 during post-monsoon. The COD between 39-49 mg L −1 was observed during High Water Flow (HWF). Much lower concentration was detected during Average Water Flow (AWF) which was between 10-14 mg L −1 . The comparative analysis between measured and simulated data showed that MIKE 11 is able to predict sufficiently accurate BOD and COD loads at the catchment outlet especially during AWF. Conclusion: Due to higher discharge during HWF some differences between measured and predicted values were observed. Therefore, it is suggested that for better agreement at higher discharges the hydraulic model simulation to be conducted using more measured flow data and by application of more precise differential equation such as RKQC and RK4.

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Section: Bod and Cod Concentrationssupporting

confidence: 83%

Validation of MIKE 11 Model Simulated Data for Biochemical and Chemical Oxygen Demands Transport

Eisakhani

Abdullah²,

Karim³

et al. 2012

American Journal of Applied Sciences

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“…The waters are mostly well oxygenated except for the internal bay stations in winter, where the waters showed under-saturation levels, which could be attributed to contamination (DESA et al, 2005). Super-saturation oxygen levels were observed in summer, most probably due to high primary productivity rate (GÓMEZ et al, 2001).…”

Section: Discussionmentioning

confidence: 99%

Diatoms, protein and carbohydrate sediment content as proxies for coastal eutrophication in Montevideo, Rio de la Plata Estuary, Uruguay

et al. 2011

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A study on sediment surface diatom composition in relation to both protein/carbohydrate content and salinity was carried out in Montevideo Bay and the adjacent coastal zone. Samples were seasonally taken during one year along a human impact gradient, and the trophic conditions were assessed from the biochemical composition of the surface sediment organic matter. The co-occurrence of the marine-brackish (Actinocyclus curvatulus, Actinocyclus gallicus, Coscinodiscus excentricus, Coscinodiscus radiatus, Hyalodiscus subtilis, Paralia sulcata) and freshwater diatom flora (Aulacoseira granulata, Aulacoseira italica, Aulacoseira muzzanensis, Actinocyclus normanii, Amphora copulata, Cyclotella meneghiniana, Nitzschia linearis), suggests myxohaline estuarine conditions in the study area. The sampling stations located within the bay, close to several contamination sources, exhibited hypertrophic conditions as indicated by the highest levels of protein content, but also by the high relative abundances of Actinocyclus normanii and Cyclotella meneghiniana, as both diatom species are very well established cosmopolitan proxies of aquatic degradation. The levels of both protein and carbohydrate content, but also photosynthetic pigments, recorded in the adjacent coastal zone suggest meso-eutrophic conditions as contamination levels from the inner bay might become diluted off shore. Multivariate diatom species-environmental data relationships, indicate that the trophic gradient is hierarchically more important than salinity in explaining the diatom distribution. The present data imply an improvement in our ability of assessing organic contamination in the study area, since both biological and biopolymer variables were introduced for the first time as a tool for assessing the benthic health/degradation in one of the most populated regions of the Río de la Plata. RESUMOFoi realizado um estudo da salinidade e da composição das diatomáceas presentes no sedimento superficial em relação ao conteúdo de proteínas/carboidratos na Baía de Montevidéu e região costeira adjacente. Foram obtidas amostras sazonalmente durante um ano ao longo de um gradiente de impacto ambiental humano, e as condições tróficas foram determinadas através da análise da composição bioquímica da matéria orgânica do sedimento superficial. A coocorrência de espécies de diatomáceas marinhas-salobras, (Actinocyclus curvatulus, Actinocyclus gallicus, Coscinodiscus excentricus, Coscinodiscus radiatus, Hyalodiscus subtilis, Paralia sulcata) e diatomáceas indicadoras de águas doces (Aulacoseira granulata, Aulacoseira italica, Aulacoseira muzzanensis, Actinocyclus normanii, Amphora copulata, Cyclotella meneghiniana, Nitzschia linearis) sugerem condições mixohalinas estuarinas na área de estudo. As estações amostradas dentro da baía, próximas às fontes contaminadoras, apresentam condições hipertróficas apontadas pelos maiores valores de proteínas e pela alta abundância relativa de Actinocyclus normanii e Cyclotella meneghiniana, sendo que ambas espécies são considerad...

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“…Lokasi untuk membudidayakan udang di laut, untuk sementara, bisa mengacu kepada kriteria untuk marikultur pada umumnya, yakni perairan laut terlindung berupa berupa teluk, selat, dan perairan terumbu karang atau gosong (Effendi, 2010). Teluk adalah tubuh perairan yang menjorok ke daratan dan relatif terlindung oleh daratan pada ketiga sisinya, memiliki pergantian masa air yang relatif lama dibandingkan dengan gosong atau selat, 405 bahkan pada bagian yang paling menjorok ke daratan cenderung stagnan dengan kadar oksigen yang relatif rendah (Desa et al, 2005). Selat adalah perairan berupa lorong sempit yang menghubungkan dua badan air yang lebih besar, umumnya memiliki arus air yang relatif lebih kuat akibat penyempitan masa air, sering terjadi pengadukan (turnover) yang menyebabkan jarang terjadi adanya stratifikasi suhu dan keragaman biota relatif rendah (Hop et al, 2006).…”

Section: Pendahuluanunclassified

OCEANOGRAPHY AND WATER QUALITY CONDITION IN SEVERAL WATERS OF THOUSAND ISLANDS AND ITS SUITABILITY FOR WHITE SHRIMP Litopenaeus vannamei CULTURE

Effendi¹,

Suprayudi²,

Nurjaya³

et al. 2016

J. Ilmu dan Teknologi Kelautan Tropis

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The purposes of this study were to determine oceanographic and water quality parameters and their suitability for white shrimp Litopenaeus vannamei culture. The measurements were carried out on dry season in Semak Daun Island, Karya Island, and Panggang Island waters of Thousand Islands, with areas of 315.0, 12.0, and 102.8 ha, mean current water velocity of 12.9, 12.7, and 13.5 ABSTRAKPenelitian ini bertujuan untuk mengetahui kondisi oseanografi dan kualitas air di beberapa perairan di Kepulauan Seribu, dan kemungkinannya untuk budidaya udang vaname Litopenaeus vannamei di laut. Pengamatan dilakukan pada saat musim kemarau. Perairan laut yang diamati adalah di sekitar Pulau Semak Daun, Pulau Pulau Karya dan Pulau Panggang yang memiliki luas masing-masing 315,0; 12,0; dan 102,8 ha, dengan kedalaman air rata-rata 4,6 m (berkisar 0,5-28,1 m); 14,6 m (0,5-26,7 m); dan 5,3 m (0,8-13,6 m), serta kecepatan arus 12,9; 12,7; dan 13,5 cm/detik. Di ketiga lokasi tersebut pasang surut bersifat diurnal dan gelombang tinggi terjadi pada Februari dan Juli-Agustus. Berdasarkan kondisi suhu, salinitas, dan densitas air laut pada saat pasang dan surut, perairan Pulau Semak Daun tampaknya cenderung terjadi turnover yang mengindikasikan sirkulasi air yang bagus, sedangkan di gosong Pulau Panggang dan Pulau Karya terjadi stratifikasi. Kualitas air di ketiga lokasi umumnya berada pada kisaran yang optimum untuk udang vaname, yakni suhu berkisar 29,8 o C; kekeruhan 0,1-1,05 NTU; kecerahan 5,8-9,7 m; padatan tersuspensi < 8 mg/L; padatan terlarut total 20-164 mg/L; pH 6,89-7,22; salinitas 32,2-32,3; oksigen terlarut 5,8-10,8 mg/L; amonia 0,068-0,145 mg/L; nitrat 1,247-2,589 mg/L; dan fosfat 1,021-2,352 mg/L, namun demikian perairan Pulau Semak Daun memiliki kesesuaian yang paling tinggi karena memiliki sirkulasi air yang lebih bagus.

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Dissolved oxygen––a target indicator in determining use of the Gulf of Kachchh waters

Cited by 24 publications

References 4 publications

Validation of MIKE 11 Model Simulated Data for Biochemical and Chemical Oxygen Demands Transport

Validation of MIKE 11 Model Simulated Data for Biochemical and Chemical Oxygen Demands Transport

Diatoms, protein and carbohydrate sediment content as proxies for coastal eutrophication in Montevideo, Rio de la Plata Estuary, Uruguay

OCEANOGRAPHY AND WATER QUALITY CONDITION IN SEVERAL WATERS OF THOUSAND ISLANDS AND ITS SUITABILITY FOR WHITE SHRIMP Litopenaeus vannamei CULTURE

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