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Journal articles on the topic 'River Oyan'

Author: Grafiati

Published: 7 June 2025

Last updated: 17 July 2025

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1

Ayodeji, Engr Kumolu Olumide, Engr Prof Adedayo Ayodele Adegbola, and Olaniyan Olatunji Sunday. "Spatial and Temporal Variation of Hydrological and Geometrical Parameters Across River Oyan, Ogun State, South Western Nigeria." International Journal of Engineering and Advanced Technology 14, no. 3 (2025): 1–5. https://doi.org/10.35940/ijeat.b4559.14030225.

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Channel erosion and sedimentation are major environmental threats to the sustainability and productive capacity of surface water. Sedimentation poses a significant threat to dam functionality, affecting water storage capacity, structural integrity, and downstream ecosystems. River Oyan has records of yearly flooding and Oyan Dam has drastically reduced in reservoir capacity due to the siltation. There was a paucity of information about erosion and sedimentation studies along the river. Objectives: Therefore, this study aimed to analyze the spatial and temporal variation of hydrological and geo

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Engr., Kumolu Olumide Ayodeji. "Spatial and Temporal Variation of Hydrological and Geometrical Parameters Across River Oyan, Ogun State, South Western Nigeria." International Journal of Engineering and Advanced Technology (IJEAT) 14, no. 3 (2025): 1–5. https://doi.org/10.35940/ijeat.B4559.14030225.

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<strong>Abstract:</strong> Channel erosion and sedimentation are major environmental threats to the sustainability and productive capacity of surface water. Sedimentation poses a significant threat to dam functionality, affecting water storage capacity, structural integrity, and downstream ecosystems. River Oyan has records of yearly flooding and Oyan Dam has drastically reduced in reservoir capacity due to the siltation. There was a paucity of information about erosion and sedimentation studies along the river. Objectives: Therefore, this study aimed to analyze the spatial and temporal variat

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3

Ipadeola, O. A., S. A. Babalola, A. Babalola, H. I. Ayo-Akano, A. Adedayo, and O. A. Abdulyekeen. "Analysis of Oyan River Channel Changes Using Remote Sensing Technology." Journal of Spatial Information Sciences 2, no. 1 (2025): 176–88. https://doi.org/10.5281/zenodo.14893657.

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This study employs remote sensing technology to analyze river channel changes in Oyan River, Abeokuta North, Ogun State, Nigeria. Understanding and monitoring river dynamics are essential for ecological sustainability and effective water resource management. Remote sensing and GIS techniques provide a cost-effective and efficient approach to assessing these changes. Landsat satellite images (30m resolution) from 2002 to 2023 at three-year intervals were compared and analyzed.  Land use land cover, river channel, and river bank erosion maps were produced. The quantity of accretion and eros

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Adejare, Q. A., S. A. Azeez, Q. J. Aderibigbe, and M. B. Adewara. "Bathymetry and Siltation of Oyan Dam, Ogun State, Nigeria." Nigerian Journal of Environmental Sciences and Technology 4, no. 2 (2020): 314–23. http://dx.doi.org/10.36263/nijest.2020.02.0208.

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Dams are reservoirs established for different reasons. Oyan dam, Ogun State, Nigeria was established and commissioned on the 29th March 1983 to supply water to Lagos State and Abeokuta for municipal uses, with power generation potentials to support Lower Ogun Irrigation Project. However, flooding has become an annual experience of downstream communities along Ogun river especially when the Oyan dam is opened; it has really becomes remarkable since the flood events of 2012. This project investigates the level of siltation and floods menace adjoining Oyan dam and its environ. An integrated metho

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Surakat, O. A., S. O. Sam-Wobo, K. A. Ademolu, et al. "Cytospecies Composition ofSimulium damnosumComplex (Diptera: Simuliidae) Breeding in Oyan River, Southwestern Nigeria." African Entomology 24, no. 1 (2016): 24–29. http://dx.doi.org/10.4001/003.024.0024.

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6

Ikhile, C. I., Kofo A. Aderogba, and Clement O. Ogunnowo. "Water Problems and Community Development: A Case Study of Igbo-Ora Community of Oyo State, Nigeria." Greener Journal of Social Sciences 2, no. 1 (2012): 1–8. https://doi.org/10.15580/gjss.2012.1.gjss1204.

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Water is known to be an inexhaustible resource because the total supply of it in the biosphere is not affected by human activities. Recycling time depends on various factors. It is not uniformly distributed all over the world and not readily available in the quantity and quality required in most parts on the earth surface. This piece has examined the sources, the crisis of scarcity, and development of water and alternatives in Igbo-Ora, Nigeria. The climate is tropical continental. The major occupation is farming. Major sources of water supply are the ponds, rivers, lakes, and rainfall. O

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Adebanji, Bankole, Oluwaseun Atoki, Taiwo Fasina, Oluwumi Adetan, and Adewale Abe. "Comparative study of off-grid and grid-connected hybrid power system: issues, future prospects and policy framework." Indonesian Journal of Electrical Engineering and Computer Science 22, no. 2 (2021): 752. http://dx.doi.org/10.11591/ijeecs.v22.i2.pp752-759.

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A sustainable energy system is of utmost importance for any significant development in any nation.This work identified some obstacles inhibiting rapid renewable energy growth in Nigeria and recommended some policy measures in overcoming them. Moreover, a comparative study of off-grid (OG) and grid-connected (GC) small hydro-solar photovoltaic-diesel hybrid system was carried out using Oyan river, Abeokuta, Nigeria as a case study. The hybrid components were modeled with and without the grid. The hydro solar resources data of the area were collected and analyzed using hybrid optimization model

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Adebanji, Bankole, Oluwaseun Atoki, Taiwo Fasina, Oluwumi Adetan, and Adewale Abe. "Comparative study of off-grid and grid-connected hybrid power system: issues, future prospects and policy framework." Indonesian Journal of Electrical Engineering and Computer Science 22, no. 2 (2021): 752–59. https://doi.org/10.11591/ijeecs.v22.i2.pp752-759.

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A sustainable energy system is of utmost importance for any significant development in any nation. This work identified some obstacles inhibiting rapid renewable energy growth in Nigeria and recommended some policy measures in overcoming them. Moreover, a comparative study of off-grid (OG) and grid-connected (GC) small hydro-solar photovoltaic-diesel hybrid system was carried out using Oyan river, Abeokuta, Nigeria as a case study. The hybrid components were modeled with and without the grid. The hydro solar resources data of the area were collected and analyzed using hybrid optimization model

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Basnayaka, Vindhya, Jayanga T. Samarasinghe, Miyuru B. Gunathilake, et al. "Analysis of Meandering River Morphodynamics Using Satellite Remote Sensing Data—An Application in the Lower Deduru Oya (River), Sri Lanka." Land 11, no. 7 (2022): 1091. http://dx.doi.org/10.3390/land11071091.

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River meandering and anabranching have become major problems in many large rivers that carry significant amounts of sediment worldwide. The morphodynamics of these rivers are complex due to the temporal variation of flows. However, the availability of remote sensing data and geographic information systems (GISs) provides the opportunity to analyze the morphological changes in river systems both quantitatively and qualitatively. The present study investigated the temporal changes in the river morphology of the Deduru Oya (river) in Sri Lanka, which is a meandering river. The study covered a per

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Kochkurkina, S., and O. Orfinskaya. "Elite objects from kurgans on the Oyat River (Leningrad Oblast)." Archaeological News 31 (2021): 252–63. http://dx.doi.org/10.31600/1817-6976-2021-31-252-263.

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This paper considers fragments of elite objects of the 10th–12th century from kurgans on the Oyat River. It is silk textiles, embroidered collars, and gold-woven threads. The authors arrived at the conclusion about the high price of these objects and the hypothetical place of their manufacture. Possibly, there were centres to which silk cloths and silk threads were imported and where women, to the extent of their skill, embroidered some details of clothes, then distrib- uted throughout a considerable territory. The rather inconsiderable qualitative level of the embroidering does not allow us t

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Yusuf, Abdulganiyu, Romoke Ojo, Mohammed O. Idrees, Abdul-Lateef Balogun, Isa B. Salami, and Ojogbane S. Sani. "Modelling flood hazards impacted by ungauged river in urbanised area using HEC-RAS and GIS." Nigerian Journal of Technological Development 20, no. 2 (2023): 83–92. http://dx.doi.org/10.4314/njtd.v20i2.1405.

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Ilorin City is located downstream of Asa, Oyun and Awun River Basins. The Asa River is a major river that traverses the city and divides the metropolitan area into east and west, almost equally. The river often overflows its banks to inundate adjacent communities, influencing severe economic damage and impact on human lives. However, efforts to mitigate this have majorly been focused on dredging the Asa River channel which has not solved the problem. For an accurate spatial and temporal understanding of the risks of floods and their potential hazards, it is important to estimate floods using r

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Interesova, E. A., A. M. Shikolov, I. V. Gryazin, and R. M. Khakimov. "Species diversity and structure of the fish community in different types water bodies of the Ergaki natural park (Western Sayan)." Rybovodstvo i rybnoe hozjajstvo (Fish Breeding and Fisheries), no. 6 (June 23, 2024): 383–90. http://dx.doi.org/10.33920/sel-09-2406-02.

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The Yenisei is one of the largest rivers on our planet. Flowing from south to north, it crosses all the natural zones of Siberia. The Yenisei basin covers the mountains and intermountain hollows of the Altai-Sayan mountainous country, the plateaus of Central and the lowlands of Western Siberia. The ichthyofauna of the flat part of the Yenisei basin is relatively well studied, while the data on the fish of the water bodies of the Western Sayan which are part of the Yenisei basin is limited in the available literature, and includes information only about the fish of some lakes. In this work, we

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Rajapaksha, R.M.G.N., H.A. Dharmagunawardhane, A.M.A.N.B. Attanayake, and Nianthi K.W.G. Rekha. "Altitudinal and temporal variation of surface water quality: An assessment in Badulu Oya Catchment, Sri Lanka." GSC Biological and Pharmaceutical Sciences 11, no. 3 (2020): 226–34. https://doi.org/10.5281/zenodo.4271374.

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Rivers are one of the main surface water resources representing a geographical unit that fulfills wide array of economic and ecological values. Quality of river water is vital for health of river ecosystem and maintain its functions. Climate and altitude are 2 of the main natural factors that influence on quality of the river waters. The study assessed altitudinal and temporal variation of surface water quality in the Badulu Oya catchment. The main river of the catchment was categorized into 3 segments based on altitudinal gradient. Ten physicochemical parameters of stream water

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Appleton, Ann. "Pelajau Kaul and The Sambas Connection." Sarawak Museum Journal LXIX, no. 90 (2011): 161–72. https://doi.org/10.61507/smj22-2011-mmbz-09.

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A connection between Sambas and Melanau communities on the Oya River has long been known. Hugh Low (1848) records a meeting with Pengiran Mahamat Ali, the ruler at Oya, who claimed descent from the Sultans of Brunei and Sambas and from a pagan aristocrat at Pelajau, a former upriver longhouse settlement. And Morris notes that in the 1960s, Melanau on the Oya River continued to differentiate between a Sarawak Malay and a Sambas Malay (Morris, 1991: 7). A connection between Pelajau and the Melanau aristocrats at Oya is also acknowledged by people in the village of Medong. However, the details of

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Shmakova, Marina V. "THE RIVER’S SEDIMENT IN THE NORTH-WEST RUSSIAN FEDERATION." Географический вестник = Geographical bulletin, no. 2(57) (2021): 65–74. http://dx.doi.org/10.17072/2079-7877-2021-2-65-74.

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Large forested areas, small slopes of catchments, the presence of lakes and swamps, the karstification of the basin, and a large share of underground river feeding contribute to a decrease in the amount of sediment runoff in the rivers located in the North-West of Russia. The distribution of sediment runoff during the year is determined by the flow regime of the river. The maximum values of the monthly solid runoff modules of all the studied rivers are observed at high water in March – May, usually reaching the peak in April, which is typical for the north-western region. Moreover, the passage

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16

Rajakaruna, Shalini Lalanthika, Gajaba Ellepola, Thilanka Gunaratne, Sumedha Madawala, and Kithsiri Ranawana. "Two new localities of the endangered fish Systomus martenstyni (Kottelat & Pethiyagoda, 1991) (Teleostei: Cyprinidae) found in Sri Lanka." Check List 11, no. 3 (2015): 1622. http://dx.doi.org/10.15560/11.3.1622.

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Systomus martenstyni is an endemic and endangered fish of Sri Lanka. This species was earlier known to be restricted to the Amban Ganga River basin. Recently two populations of S. martenstyni were located in two major tributaries of River Mahaweli: Loggal Oya and Badulu Oya in the Uva province of Sri Lanka. These new populations are relatively small and are facing the threat of habitat quality degradation and habitat loss. Effective conservation actions should be undertaken to conserve this endangered fish species.

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Rajakaruna, Shalini, Gajaba Ellepola, Thilanka Gunaratne, Sumedha Madawala, and Kithsiri Ranawana. "Two new localities of the endangered fish Systomus martenstyni (Kottelat & Pethiyagoda, 1991) (Teleostei: Cyprinidae) found in Sri Lanka." Check List 11, no. (3) (2015): 1–4. https://doi.org/10.15560/11.3.1622.

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<em>Systomus martenstyni </em>is an endemic and endangered fish of Sri Lanka. This species was earlier known to be restricted to the Amban Ganga River basin. Recently two populations of <em>S. martenstyni</em> were located in two major tributaries of River Mahaweli: Loggal Oya and Badulu Oya in the Uva province of Sri Lanka. These new populations are relatively small and are facing the threat of habitat quality degradation and habitat loss. Effective conservation actions should be undertaken to conserve this endangered fish species.

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Novianta, Muhammad Andang, Syafrudin, Budi Warsito, and Siti Rachmawati. "Monitoring river water quality through predictive modeling using artificial neural networks backpropagation." AIMS Environmental Science 11, no. 4 (2024): 649–64. http://dx.doi.org/10.3934/environsci.2024032.

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<p>Predicting river water quality in the Special Region of Yogyakarta (DIY) is crucial. In this research, we modeled a river water quality prediction system using the artificial neural network (ANN) backpropagation method. Backpropagation is one of the developments of the multilayer perceptron (MLP) network, which can reduce the level of prediction error by adjusting the weights based on the difference in output and the desired target. Water quality parameters included biochemical oxygen demand (BOD), chemical oxygen demand (COD), total suspended solids (TSS), dissolved oxygen (DO), tota

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Sudasinghe, H., P. Suranga, and D. M. S. S. Karunarathna. "Fish die-off in the Attanagalu-Oya River, Sri Lanka: a provisional checklist of icthyofauna." TAPROBANICA 7, no. 1 (2015): 49–52. http://dx.doi.org/10.47605/tapro.v7i1.158.

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Attanagalu Oya basin is situated between the two major river basins Kelani and Maha Oya in Western province of Sri Lanka and has an extent of 779 km2. It plays a major role in national water supply since it contains four major national water supply and drainage board intakes. This short communication intends to provide a recent report of fish die-off in the Attanagalu Oya and also include provisional checklist of icthyofaunal diversity in the area. The fish faunal data were collected from the catches of fishermen using cast nets, and hooks. In addition, fish in shallow areas were sampled by us

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20

Abdulkadir, Taofeeq Sholagberu. "Assessment of morphological and hydrological parameters of Oyun River Basin, Nigeria." Ethiopian Journal of Environmental Studies and Management 9, no. 4 (2016): 470. http://dx.doi.org/10.4314/ejesm.v9i4.7.

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21

Ogbu, Kingsley Nnaemeka, Emeka L. Ndulue, Isiguzo Edwin Ahaneku, and Ikenna Joseph Ubah. "Evaluation of the Impact of Climate Change on Streamflow Using SWAT Model." ASM Science Journal 13 (June 24, 2020): 1–8. http://dx.doi.org/10.32802/asmscj.2020.494.

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The Soil and Water Assessment Tool (SWAT) model was applied in this study to simulate stream-flow in the Oyun River Basin. The model was calibrated and validated using monthly stream-flow data for the basin. Model performance was satisfactory for calibration and validation with a coefficient of determination (R2) of 0.69 and 0.88, respectively. Climate change impact on Oyun River was assessed by driving the SWAT model with climate parameters obtained from two global climate models (HadGEM2-ES and BCC-CCSM1-1M) based on RCP 2.6 for 2050 – 2059 and 2080 – 2089 periods. With respect to a baseline

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Rathnayaka, Pradeep Tharanga Kumara, and Jin-Young Lee. "Design and Optimization of Water Level Control Gate System in Malwathu Oya River, Sri Lanka." Water 16, no. 19 (2024): 2797. http://dx.doi.org/10.3390/w16192797.

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This research focuses on improving flood management of the Malwathu Oya River in Anuradhapura Historical City, Sri Lanka, by designing an efficient gate system for the weir of Halpan Ela in the Malwathu Oya River. Frequent flooding threatens agriculture, infrastructure, and public safety in this region. This research aims to enhance water level control in the upper reach of Halpan Ela Anicut by evaluating rainfall patterns, tank spillway efficiency, and gate operation challenges. Historical data on rainfall and tank spillage were analyzed. Flow simulations revealed significant pressure differe

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Madumali, G. V. H. M., and M. M. S. B. Manamperi. "Impact of water scarcity on Agriculture in Mi Oya River Basin." TRIVALENT ත්‍රිසංයුජ: Journal of Archaeology, Tourism & Anthropology 1, no. 2 (2020): 80. http://dx.doi.org/10.4038/tjata.v1i2.40.

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Rathnayake, Namal, Upaka Rathnayake, Tuan Linh Dang, and Yukinobu Hoshino. "Water level prediction using soft computing techniques: A case study in the Malwathu Oya, Sri Lanka." PLOS ONE 18, no. 4 (2023): e0282847. http://dx.doi.org/10.1371/journal.pone.0282847.

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Hydrologic models to simulate river flows are computationally costly. In addition to the precipitation and other meteorological time series, catchment characteristics, including soil data, land use, land cover, and roughness, are essential in most hydrologic models. The unavailability of these data series challenged the accuracy of simulations. However, recent advances in soft computing techniques offer better approaches and solutions at less computational complexity. These require a minimum amount of data, while they reach higher accuracies depending on the quality of data sets. The Gradient

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Dragan, Sergey V. "Materials to the fauna of caddisflies (Insecta: Trichoptera) from streams and reservoirs of the Ergaki Natural Park (Western Sayan)." Samara Journal of Science 9, no. 3 (2020): 54–57. http://dx.doi.org/10.17816/snv202093109.

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For a little more than a century, researchers have been studying the fauna of caddisflies of streams and lakes of the Ergaki Natural Park. The paper provides a brief overview of studies of the caddisfly fauna in the upper part of the Oya and Us rivers basin. Caddisflies were collected in the Ergaki Natural Park (Western Sayan) in the 2015 using different methods. Altogether, collections were made at 13 sampling sites in the springs, streams and lakes. A total of 17 species belonging to 14 genera and 7 families were collected. Oligotricha lapponica (Hagen, 1864) and Lenarchus sp. are new to the

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K. Okoro, H., and H. A. Jimoh. "Speciation and determination of priority metals in sediments of Oyun River, Ilorin, Kwara, Nigeria." Bulletin of the Chemical Society of Ethiopia 30, no. 2 (2016): 199. http://dx.doi.org/10.4314/bcse.v30i2.4.

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Pathirana, K. P. S. T., R. M. A. De S.Thanapathy, and K. D. W. Nandalal. "River Basin Modelling for Optimum Water Usage: Uma Oya Downstream Development Area." Engineer: Journal of the Institution of Engineers, Sri Lanka 50, no. 2 (2017): 11. http://dx.doi.org/10.4038/engineer.v50i2.7248.

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Koswaththa, H. M. S. A., S. K. Ranasinghe, Imesh Ekanayake, Damayanthi Herath, and N. G. P. B. Neluwala. "Downscaling Future Precipitation over Mi Oya River Basin using Artificial Neural Networks." Engineer: Journal of the Institution of Engineers, Sri Lanka 57, no. 2 (2024): 57–67. http://dx.doi.org/10.4038/engineer.v57i2.7649.

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Studying future precipitation behaviour in river basins is essential for proper water resources and land-use planning within them, as this will help to reduce the risk and mitigate disasters that can occur in the future. General Circulation Models (GCMs) are used to study future precipitation fluctuations, which simulate large-scale climate variations under the effect of greenhouse gas changes. The GCM runs at a coarse spatial resolution which cannot be directly used for climate impact studies. Therefore, downscaling is required to extract the sub-grid and local scale information. This study e

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Khaniya, Bhabishya, Isuru Jayanayaka, Pradeep Jayasanka, and Upaka Rathnayake. "Rainfall Trend Analysis in Uma Oya Basin, Sri Lanka, and Future Water Scarcity Problems in Perspective of Climate Variability." Advances in Meteorology 2019 (May 8, 2019): 1–10. http://dx.doi.org/10.1155/2019/3636158.

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The effect of climate variability on the rainfall pattern is canvassed on the Uma Oya river basin, Sri Lanka, consisting of 5 rainfall gauging stations. The Uma Oya basin (720 km2) is given utmost precedence due to environmental concerns seen in the ongoing Uma Oya multipurpose development project (529 million USD worth) which is expected to divert water to the southeast dry zone of the country while adding 231 GWh/year electricity to the national grid. The rainfall data for a period of 26 years (1992–2017) were analysed using Mann–Kendall’s test and Sen’s slope estimator test to identify the

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Gayanthika, Hansini, Dimuthu Lakshitha, Manthika Chathuranga, Gouri De Silva, and Jeewanthi Sirisena. "Comparative Analysis of Satellite-Based Rainfall Products for Drought Assessment in a Data-Poor Region." Hydrology 12, no. 7 (2025): 166. https://doi.org/10.3390/hydrology12070166.

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Drought is one of the most impactful natural disasters, and it significantly impacts three main sectors of a country: the environment, society, and the economy. Therefore, drought assessment and monitoring are essential for reducing vulnerability and risk. However, insufficient and sparse long-term in situ rainfall data limit drought assessment in developing countries. Recently developed satellite-based rainfall products, available at different temporal and spatial resolutions, offer a valuable alternative in data-poor regions like Sri Lanka, where rain gauge networks are sparse and maintenanc

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WALKER, J. H. "Hikayat Panglima Nikosa and the Sarawak Gazette: Transforming Texts in Nineteenth Century Sarawak." Modern Asian Studies 39, no. 2 (2005): 427–60. http://dx.doi.org/10.1017/s0026749x04001507.

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Hikayat Panglima Nikosa (HPN) is one of northwest Borneo's earliest available texts. First published in 1876, its importance is enhanced by the relative paucity of other written material and still limited progress in the collection and transcription of the region's rich corpus of oral literature. Although written material survives from the Lingga River area, the Oya and Limbang districts, as well as from the courts of Brunei and Pontianak, the HPN is the earliest known Malay document from the Sarawak River region itself. HPN was uncovered among a group of pamphlets in Rhodes House Library in 1

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Brieger, William R., Frederick O. Oshiname, and Oladele O. Ososanya. "Stigma associated with onchocercal skin disease among those affected near the Ofiki and Oyan rivers in Western Nigeria." Social Science & Medicine 47, no. 7 (1998): 841–52. http://dx.doi.org/10.1016/s0277-9536(98)00007-0.

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Adeogun, Adeniyi G., Abdulrasheed W. Mansur, and Abdurasaq A. Mohammed. "Effects of Resampled DEM on Watershed Characteristics and Prediction of Sediment Load in Oyun Watershed, Kwara, Nigeria." Journal of Civil Engineering and Urbanism 14, no. 3s (2024): 199–205. https://doi.org/10.54203/jceu.2024.20.

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Understanding the terrain and its impact on watershed characteristics, streamflow, and sediment loading is crucial for effective water resource management. This study investigates the influence of resampled Digital Elevation Models (DEM) on the prediction of watershed characteristics, streamflow, and sediment loading upstream of Oyun River Watershed, Nigeria. Various DEM resolutions, ranging from 30-meter to 90-meter, were analysed to assess their effects on hydrological predictions. To delineate the watershed, a DEM of 90-meter resolution was sourced from the space Shuttle Radar Topography Mi

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Ariza Flores, Victor Andre, and Rachel Salvador. "Adaptive Risk Management in Road Construction: Oyon-Ambo Highway Insights, El Niño 2019 Case Study." E3S Web of Conferences 497 (2024): 02020. http://dx.doi.org/10.1051/e3sconf/202449702020.

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This research provides an in-depth analysis of the challenges faced during the construction of the Oyon-Ambo highway in Peru, particularly during the extreme rainfall events associated with the 2019 El Niño phenomenon. Situated in the high Andean area of the Pasco region, this rigid pavement road project encountered significant disruptions due to the extraordinary weather conditions. The adjacent Chaupihuaranga River experienced increased flow rates, causing extensive damage to the road and necessitating substantial modifications to the engineering plans. Focusing on 14 critical sectors identi

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Rofiat Bunmi, Mudashiru. "Morphometric Analysis of Asa and Oyun River Basins, North Central Nigeria Using Geographical Information System." American Journal of Civil Engineering 5, no. 6 (2017): 379. http://dx.doi.org/10.11648/j.ajce.20170506.20.

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Pushpakumara, Thudugalage Don Chaminda, and T. V. Achala Isuru. "Flood Modelling and Analyzing of Attanagalu Oya River Basin Using Geographic Information System." International Journal of Advanced Remote Sensing and GIS 7, no. 1 (2018): 2712–18. http://dx.doi.org/10.23953/cloud.ijarsg.366.

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Grenaderova, A. V., and R. A. Sharafutdinov. "RECONSTRUCTION OF PALAEOECOLOGICAL CONDITIONS IN THE VALLEY OF OYA RIVER IN LATE HOLOCENE." Proceedings of the Tigirek State Natural Reserve, no. 1 (2005): 141–46. http://dx.doi.org/10.53005/20767390_2005_1_141.

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Ladokun, Laniyi Laniran. "Hydrodynamic Performance Assessment of Straight and Helical Hydrokinetic Turbine Hydrofoil-Blade Sections in River Oyun, North-Central Nigeria." Mekanika: Majalah Ilmiah Mekanika 23, no. 2 (2024): 168. https://doi.org/10.20961/mekanika.v23i2.92527.

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The performance of lift-based hydrokinetic rotor turbines usually depends on the blade sections or hydrofoil profile. Different hydrofoil blade sections, having different profiles and geometries, give different coefficients of performance in different hydrodynamic settings. This study examined the influence of blade geometry on the power stage characterization of vertical axis crossflow hydrokinetic turbines under conditions of low river current velocity. Two turbines have been selected to characterize the power stage. Pre-developed straight-bladed National Advisory Committee for Aeronautics (

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Samarasingha, S. M. T. C., M. S. Sandaruwan, D. S. Sampath, and N. G. P. B. Neluwala. "Dynamic Downscaling of Rainfall Data for Deduru Oya River Basin using WRF Weather Model." Engineer: Journal of the Institution of Engineers, Sri Lanka 54, no. 2 (2021): 69. http://dx.doi.org/10.4038/engineer.v54i2.7443.

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Withanage, N. S., N. D. K. Dayawansa, and R. P. De Silva. "Morphometric analysis of the Gal Oya river basin using spatial data derived from GIS." Tropical Agricultural Research 26, no. 1 (2015): 175. http://dx.doi.org/10.4038/tar.v26i1.8082.

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Silva, E. I. L. "Quality of Irrigation Water in Sri Lanka – Status and Trends." Asian Journal of Water, Environment and Pollution 1, no. 1-2 (2004): 5–12. http://dx.doi.org/10.3233/ajw-2004-1_1-2_03.

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Already available and newly collected data sets on water chemistry of twenty reservoirs located in seven river basins in Sri Lanka were analyzed to determine the status and trends in irrigation related water quality characteristics. pH of irrigation water varied within a wide range but the upper limit did not exceed the proposed level suitable for irrigation water. Salinity was found beyond the threshold level (1.250 g l $^{-1}$ ) only in two reservoirs located downstream of the Malwathu Oya basin and the electrical conductivity had never reached above 1 mS cm $^{-1}$ . Sodium absorption ratio

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Arise, R. O., A. B. Alabi, O. S. Maccarthy, et al. "In Vivo effects of zinc oxide-Chromolaena odorata nanoparticle treated Oyun river water." Sri Lankan Journal of Biology 4, no. 2 (2019): 13. http://dx.doi.org/10.4038/sljb.v4i2.41.

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Eriyagama, Nishadi, Vladimir Smakhtin, and Lakshika Udamulla. "Centralized versus distributed reservoirs: an investigation of their implications on environmental flows and sustainable water resources management." Proceedings of the International Association of Hydrological Sciences 379 (June 5, 2018): 43–47. http://dx.doi.org/10.5194/piahs-379-43-2018.

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Abstract. Storage of surface water is widely regarded as a form of insurance against rainfall variability. However, creation of surface storage often endanger the functions of natural ecosystems, and, in turn, ecosystem services that benefit humans. The issues of optimal size, placement and the number of reservoirs in a river basin – which maximizes sustainable benefits from storage – remain subjects for debate. This study examines the above issues through the analysis of a range of reservoir configurations in the Malwatu Oya river basin in the dry zone of Sri Lanka. The study produced multipl

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Senarathne, S. L., J. M. C. K. Jayawardana, E. A. N. V. Edirisinghe, and Rohana Chandrajith. "Characterization of groundwater in Malala Oya river basin, Sri Lanka using geochemical and isotope signatures." Groundwater for Sustainable Development 9 (October 2019): 100225. http://dx.doi.org/10.1016/j.gsd.2019.100225.

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Kotalawala, AB. "Impact of weirs on fish fauna of Wak-Oya, a tributory of the Kelani River." Journal of the National Science Foundation of Sri Lanka 22, no. 1 (1994): 65. http://dx.doi.org/10.4038/jnsfsr.v22i1.7111.

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Sudasinghe, Hiranya, P. Suranga, and D. M. S. S. Karunarathna. "Fish die-off in the Attanagalu-Oya River, Sri Lanka: a provisional checklist of icthyofauna." TAPROBANICA: The Journal of Asian Biodiversity 7, no. 1 (2015): 49. http://dx.doi.org/10.4038/tapro.v7i1.7198.

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Diyaolu, Oluwatofunmilayo A., Gagan Preet, Adeshola A. Fagbemi, et al. "Antiparasitic Activities of Compounds Isolated from Aspergillus fumigatus Strain Discovered in Northcentral Nigeria." Antibiotics 12, no. 1 (2023): 109. http://dx.doi.org/10.3390/antibiotics12010109.

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In this study, we explored a fungal strain UIAU-3F identified as Aspergillus fumigatus isolated from soil samples collected from the River Oyun in Kwara State, Nigeria. In order to explore its chemical diversity, the fungal strain UIAU-3F was cultured in three different fermentation media, which resulted in different chemical profiles, evidenced by LC-ESI-MS-based metabolomics and multivariate analysis. The methanolic extract afforded two known compounds, fumitremorgin C (1) and pseurotin D (2). The in vitro antiparasitic assays of 1 against Trypanosoma cruzi and Plasmodium falciparum showed m

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Senanayake, Sumudu, Biswajeet Pradhan, Alfredo Huete, and Jane Brennan. "Assessing Soil Erosion Hazards Using Land-Use Change and Landslide Frequency Ratio Method: A Case Study of Sabaragamuwa Province, Sri Lanka." Remote Sensing 12, no. 9 (2020): 1483. http://dx.doi.org/10.3390/rs12091483.

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This study aims to identify the vulnerable landscape areas using landslide frequency ratio and land-use change associated soil erosion hazard by employing geo-informatics techniques and the revised universal soil loss equation (RUSLE) model. Required datasets were collected from multiple sources, such as multi-temporal Landsat images, soil data, rainfall data, land-use land-cover (LULC) maps, topographic maps, and details of the past landslide incidents. Landsat satellite images from 2000, 2010, and 2019 were used to assess the land-use change. Geospatial input data on rainfall, soil type, ter

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Kochkurkina, Svetlana. "Coins as a Chronological Indicator of the Ladoga Kurgan Culture." Stratum plus. Archaeology and Cultural Anthropology, no. 6 (December 2022): 161–67. http://dx.doi.org/10.55086/sp226161167.

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The area of the Kurgan culture at the turn of the 1 st —2 nd millennia included the South-Eastern Ladoga area with the basins of the Syas, Tikhvinka, Voronezhka, Pasha, Kapsha, Oyat, Svir rivers; the region of the Onega Lake with the system of rivers Olonka, Tuloksa, Vidlitsa, and the northern coast of Lake Onega. Several generations of archaeologists have investigated more than 700 mounds; English, German, Czech, Byzantine, and Oriental coins, as well as unspecified Western European products and their fragments were found in 91 of them. Coins with riveted ears were used together with beads as

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Kolawole,, Olatunji, Anibijuwon, Ibitayo, Suleiman Mustapha, and Asaolu Olubayode. "The Incidence of Vibrio Cholerae as an Indicator of Pollution of Oyun River in Ilorin, Kwara State Nigeria." Egyptian Academic Journal of Biological Sciences, G. Microbiology 12, no. 1 (2020): 45–54. http://dx.doi.org/10.21608/eajbsg.2020.82018.

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