scholarly journals TWO-POND FEEDING NURSERY FISH BREEDING COMPLEX

2020 ◽  
Author(s):  
Vl. N. Shkura ◽  
◽  
A. V. Shevchenko ◽  
Keyword(s):  
Water Supply ◽  
Water Discharge ◽  
Water Levels ◽  
Design Solution ◽  
Fish Ponds ◽  
Pipe System ◽  
Fish Trap ◽  
Fish Breeding ◽  
The Difference ◽  
Search Design

Purpose: development and description of the layout and design solution for a two-pond feeding nursery fish-breeding complex, which characterizes by compact placement of its constituent structures and their adaptation to the topographic conditions of the territory. Materials and methods. The theoretical and empirical basis for the development was made up of well-known recommendations on design and construction of pond complexes and survey data of operating fish-breeding facilities and their structures. During the development, the technologies of search design of engineering projects in compliance with fish breeding requirements and restrictions were used. Results. The fish-breeding complex includes: two fish-breeding ponds with a common dividing dam and a water supply system including a pumping station; water supply pipe system; a system of devices and structures that ensure the release of fish grown in ponds into a fish trap; spillway devices for discharging water from ponds and a fish trap with a set of regulating elements. Fish ponds are located on the floodplain lands of the river Don and are formed by protecting dikes. The bed of the reservoirs is planned with sections with longitudinal and transverse slopes to the water-fish collecting and-transporting ditches arranged in their bottom, allowing them to be emptied and the fish grown in the ponds to be directed to the outlet structures. The release of fish from the ponds is carried out by two tower water outlets. The design of the fish trap provides for the accumulation and seine fishing, it is equipped with means for regulating water discharge and maintaining conditions for fish. Conclusions. The developed layout and design solution for a two-pond fish-breeding complex with one fish trap is adapted to the local relief and the difference in water levels in ponds and in water intake. The implemented layout and design solutions can be used in the development of similar objects

SMHI Aqua: a new co-generated hydro-climate service to enable sustainable freshwater management

2020 ◽  
Author(s):  
Carolina Cantone ◽  
Helen Ivars Grape ◽  
Joel Dahné ◽  
Johan Andreasson ◽  
Mats Kindahl ◽  
...  
Keyword(s):  
Drinking Water ◽  
Water Supply ◽  
Water Discharge ◽  
Water Levels ◽  
Water Withdrawal ◽  
Strong Impact ◽  
Seasonal Forecasts ◽  
Temporal Shift ◽  
Groundwater Availability ◽  
Climate Service

<p>Water management is strongly dependent both on the short-term and seasonal variability of weather patterns. The increase in evapotranspiration and temporal shift of snow melt due to temperature rise is expected to have strong impact on water resources in Sweden with risk of severe deficit in summer and surplus in winter. For drinking water producers and freshwater managers a good understanding of the current hydro-meteorological situation is essential to ensure both urban water supply and compliance of water regulations.</p><p>This study is the result of collaboration between SMHI and Nodra, the municipal water company in Norrköping, Sweden. In 2016, warmer temperatures and reduced precipitation rates led to very low water levels in a ground water treatment plant used to supply drinking water to Kolmården, a region highly influenced by tourism in the summer season. This raised the need of monitoring freshwater availability and hydrological seasonal forecasts to be implemented for ensuring optimal water usage. To this end, a hydrological model is setup to simulate the water balance in freshwater reservoirs for evaluating groundwater recharge in the soil. Short to medium range (1-10 days) weather forecasts and seasonal climatological forecasts (6 months ahead) of water levels are produced at the local scale. Aiming at supporting long-term water planning, different management strategies of water withdrawal are used to feed the operational forecasting systems to assess groundwater availability in the following months.</p><p>Within the framework of the Horizon 2020 CLARA project; SMHI co-developed Aqua, a water supply assessment service tailored to the needs of public authorities and private companies involved in the water supply sector. Aqua includes a web-based platform that incorporates real-time station observations of precipitation, temperature, water levels, water discharge and raw water withdrawal.  Forecasts of relevant hydro-meteorological modelled parameters are also included and presented in an intuitive way through maps, graphs and tables. To overcome the challenges of communicating results of the probabilistic component of hydrological seasonal forecasts to the users, the visualization of forecasted groundwater levels is kept simple, whilst the provision of historical values allows an easy comparison against normal conditions.</p><p>The availability of tools displaying observations, modelled results and forecasts facilitates the understanding of the current hydro-meteorological situations as well as future wet/dry periods also to non-expert users, increasing preparedness of public and private organizations to extreme conditions while ensuring water security. Operational since March 2019, the Aqua service has provided Nodra with valuable insights for planning of groundwater withdrawal and decision support for coping with water scarcity, showing the potential of the co-generated hydro-climate service to bridge the gap between operational management and scientific innovation.</p>

scholarly journals WATER INTAKE FROM A SURFACE WATER SOURCE FOR FISH BREEDING AND RECLAMATION COMPLEXES

2021 ◽  
Author(s):  
A. V. Shevchenko ◽  
◽  
G. N. Puras ◽  
Keyword(s):  
Surface Water ◽  
Water Supply ◽  
Water Intake ◽  
Water Body ◽  
Aquatic Organisms ◽  
Supply System ◽  
Water Supply System ◽  
Design Solution ◽  
Fish Breeding ◽  
Fish Protection

Purpose: development of a layout-design solution for water intake from a surface water body, excluding the entry of harmful aquatic organisms into fish-breeding reservoirs. In accordance with modern ideas about water intakes that meet the requirements of fish protection and prevent the ingress of aquatic organisms into water supply system of fish-breeding complexes, filtering water intakes are the most effective. Materials and Methods. The water intakes structures development is based on the materials of the fish and water body surveys and the results of the analysis of developments in this area. Results. As part of water nutrition system of the fish-breeding complex, it is proposed to use a water intake with a two-chamber water inlet equipped with filtering panels and regulating screens. Filtering panels located at the head of each of the chambers ensure the retention of harmful, weed and predatory aquatic organisms, and the screens ensure the water inlet shutdown at replacing the filtering panels. Various modes of water inlet chambers operation are considered for intake of various water flows, replacement of filter cassettes and shutdown of water intake operation. It is proposed to use a filtering panel with impervious chambers, which make it possible to simplify the cleaning of its filler as a filtering element. Conclusions. A layout solution for a filtering water intake as part of water nutrition system of the fish-breeding complex has been proposed and developed. The design of a two-chamber water intake based on the use of filter panels and impervious screens, providing fish protection functions and preventing harmful, weed and predatory species of aquatic organisms from entering the water supply system is developed. A technology for water inlet functioning under various operating modes of the water intake has been developed. It is proposed to use a filtering panel with a simplified scheme for cleaning it from colmatation products as a water inlet element of the water intake.

scholarly journals Inter-annual change of the drought limit water level of a reservoir based on system dynamics

Water Policy ◽  
2018 ◽  
Vol 21 (1) ◽  
pp. 91-107 ◽  
Author(s):  
Fawen Li ◽  
Dong Yu ◽  
Yong Zhao ◽  
Runxiang Cao
Keyword(s):  
Water Supply ◽  
System Dynamics ◽  
Water Level ◽  
Water Levels ◽  
Disaster Mitigation ◽  
Structural Diagram ◽  
Yuqiao Reservoir ◽  
Engineering Measure ◽  
Drought Early Warning ◽  
Limit Water Level

Abstract Drought is one of the major natural disasters affecting the development of economies and society. Drought early warning is the primary step and most important non-engineering measure for drought relief. This paper took Yuqiao Reservoir in Tianjin as a case study and analysed inter-annual changes of the drought limit water level. First, the causality between variables in the water supply–demand system was analysed, and a structural diagram of water sources allocation was drawn. Coupled with the parameters and a structural diagram, a system dynamics (SD) model of the water supply volume was established. Secondly, simulation results were tested to ensure that the model was valid. The water supply volume from 2003 to 2020 was simulated by using the model. Finally, based on the inflow process and the water supply volume, the drought limit water level was calculated. The results showed the water supply volume of Yuqiao Reservoir has changed remarkably. The drought limit water levels in 2003–2012 and in 2016–2020 were 16.70 m and 16.30 m, respectively: a difference of 0.40 m. The regulation curve of guarantee for water supply during 2016–2020 is significantly lower than that of 2003–2012. This research is of great significance for drought resistance, disaster mitigation and reservoir management.

scholarly journals Changes in composition of aquatic bird assemblages associated with changing in water levels in the Aquatic Terrestrial Transitional Zone of the Pantanal wetland Brazil

2020 ◽  
Vol 9 (10) ◽  
pp. e4479108555
Author(s):  
Josué Ribeiro da Silva Nunes ◽  
Carolina Joana da Silva ◽  
Solange Kimie Ikeda-Castrillon ◽  
Nilo Leal Sander
Keyword(s):  
Aquatic Macrophyte ◽  
Transitional Zone ◽  
High Water ◽  
Flood Pulse ◽  
Water Levels ◽  
Aquatic Birds ◽  
Mato Grosso ◽  
Paraguay River ◽  
The Difference ◽  
Pantanal Wetland

The Pantanal wetland Mato Grosso, Brazil is among the largest floodplains in the world, with a mosaic of different habitats and rich aquatic and terrestrial biota. The habitat mosaics are found in the Chacororé and Sinhá Mariana lake System. These parental lakes of the Cuiabá River, a left tributary of the Upper Paraguay River, are known for their aquatic productivity and scenic beauty. The characteristics of these lakes and their floodplains are showed through the difference between their waters, the diversity of the aquatic macrophytes communities, fish communities and aquatic birds. Our study looked at changes in limnological variables as well as diversity of aquatic birds, during high water or flooded phase; medium water or receding phase; and the low water or dry phase. We used a temporary small lagoon in the floodplain of this system as our study area. The flood pulse is the main ecological factor affecting the Pantanal; it modifies ecological process and species composition. The water depth decreases during the season, decreasing electrical conductivity, dissolved phosphate and nitrate, water transparency, dissolved oxygen and biomass of aquatic macrophyte; and increasing calcium, total phosphorus and total nitrogen. We also observed increase in species richness and abundance of aquatic birds during the receding phase. Results show that the number of species (density) of aquatic birds increased from 10 to 30 species and the numbers of individuals from 40 to 936. The maximum richness and abundance of aquatic birds was registered during the receding phase.

scholarly journals FAKTOR DOMINAN DAN STRATEGI PENYEDIAAN AIR BERSIH DI DESA RAWAN AIR BERSIH PADA KECAMATAN BAITUSSALAM KABUPATEN ACEH BESAR

2018 ◽  
Vol 1 (4) ◽  
pp. 903-914
Author(s):  
Erwin Ferdinansyah ◽  
Azmeri Azmeri ◽  
Eldina Fatimah
Keyword(s):  
Water Supply ◽  
Ground Water ◽  
Water Discharge ◽  
Water Source ◽  
Dominant Factor ◽  
Clean Water ◽  
Water Infrastructure ◽  
Service Areas ◽  
Drinking Water Supply System ◽  
Water Problems

Abstract: Baitussalam sub-district is one of the areas vulnerable to water in the district of Aceh Besar. During this time the District community Baitussalam it difficult to obtain a continuous flow of clean water. This is due to the remote location of the water source so as to obtain clean water, people need a lot of time and effort. Villagers District of Baitussalam were not served with clean water Regional Water Company (PDAM) Tirta Mountala, using ground water as clean water. Problems arise when the dry season, the ground water level has decreased, even loss of water discharge at all. This study aims to identify the dominant factors that may affect the distribution of water supply and analyze the strategy of water supply clean water prone villages in the subdistrict of Aceh Besar district Baitussalam. This research was conducted with questionnaires and interviews. Observations were made on the District community Baitussalam unserved water from PDAM Tirta Mountala. The results showed that the dominant factor affecting the distribution of clean water in District Baitussalam is an area that will be served by PDAM Tirta Mountala, and the allocation of increased funding water infrastructure. Strategy clean water supply in villages prone to water in the District Baitussalam is a set of service areas by PDAM Tirta Mountala towards building water treatment, then allocate increased funding water infrastructure, improve the discharge source of clean water related water needs in each village, and do development of Drinking Water Supply system (SPAM). Abstrak: Kecamatan Baitussalam merupakan salah satu kawasan rawan air bersih yang ada di Kabupaten Aceh Besar. Selama ini masyarakat Kecamatan Baitussalam mengalami kesulitan untuk mendapatkan air bersih yang kontinu mengalir. Hal ini disebabkan karena lokasi yang jauh dari sumber air sehingga untuk mendapatkan air bersih, masyarakat membutuhkan banyak waktu dan tenaga. Masyarakat desa Kecamatan Baitussalam yang tidak terlayani air bersih Perusahaan Daerah Air Minum (PDAM) Tirta Mountala, menggunakan air tanah sebagai air bersih. Permasalahan timbul saat musim kemarau, muka air tanah mengalami penurunan, bahkan kehilangan debit air sama sekali. Penelitian ini bertujuan untuk mengindentifikasi faktor dominan yang dapat mempengaruhi distribusi penyediaan air bersih dan menganalisis strategi penyediaan air bersih di desa rawan air bersih pada Kecamatan Baitussalam Kabupaten Aceh Besar. Penelitian ini dilakukan dengan penyebaran kuesioner dan wawancara. Pengamatan dilakukan pada masyarakat Kecamatan Baitussalam yang belum mendapatkan pelayanan air dari PDAM Tirta Mountala. Hasil penelitian menunjukkan bahwa faktor dominan yang mempengaruhi distribusi air bersih di Kecamatan Baitussalam adalah luas wilayah yang akan dilayani oleh PDAM Tirta Mountala, dan alokasi dana peningkatan prasarana air bersih. Strategi penyediaan air bersih di desa rawan air bersih pada Kecamatan Baitussalam adalah menetapkan wilayah pelayanan oleh PDAM Tirta Mountala terhadap bangunan pengolahan air bersih, kemudian mengalokasikan dana peningkatan prasarana air bersih, meningkatkan debit sumber air besih terkait kebutuhan air pada masing-masing desa, dan melakukan pengembangan Sistim Penyediaan Air Minum (SPAM).

scholarly journals Research solutions technical - water technology to reduce the water loss for water supply system of Hochiminh city

2013 ◽  
Vol 16 (1) ◽  
pp. 49-57
Author(s):  
Tuan Anh Vo
Keyword(s):  
Water Supply ◽  
Water Loss ◽  
Salt Water ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Supply System ◽  
Water Supply System ◽  
The Sustainable Development ◽  
Pipe System ◽  
Pipe Line

The HCMC water supply system have built from the French Colonial period, and developed without planning and systematic study during the war time. In the beginning, this system used for the small town Saigon- Gia Dinh. Today, the capacity of water supply system is 1,85 million m3/day and will increase up to 2,5 million in next few year and up to 4-5 million m3/day according with the HCMC water supply system planning approved by Government. The climate change issues, salt water lever increase, polution... affect directly into the raw water resource of the existing and future water treatment plant. Beside that, the big size water supply transmission pipe line and the distribution water supply system of 06 hydrolique zone in HCMC damaged according with time : bad quality and No- update information of pipe system… It bring the real water loss level in HCMC so high up to 40% - 50% .The acceptable technologies & techniques solution to find the leak, optimal management for the water supply system to reduce the water loss is extremely essential, to support the clean water resources for the sustainable development of the HCM City.

Results of experimental work on the application of the aquacrop rotation practice in fish ponds in Iraq

2021 ◽  
pp. 56-67
Author(s):  
Farhan Yasin Hamed Farhan Yasin Hamed ◽  
Lydia Mikhailovna Vasilyeva ◽  
Natalia Viktorovna Sudakova ◽  
Ali Attala Muheisin ◽  
Adelia Zakirovna Anokhina
Keyword(s):  
Crop Rotation ◽  
Production Efficiency ◽  
Crop Yields ◽  
Fish Farming ◽  
Fish Ponds ◽  
Average Value ◽  
Fish Breeding ◽  
Feed Costs ◽  
The Cost ◽  
Fish Productivity

The use of the crop rotation method in fish farming makes it possible to increase fish productivity and crop yields in ponds. In the countries of the Middle East, in recent years, the Aqua Crop rotation practice has been developing, in particular, the consistent cultivation of fish and rice in fish ponds, which allows eliminating the contradictions between these crops and increasing production efficiency. In Iraq, an experiment was carried out on the variable cultivation of rice and carp in fish ponds for four years, with the aim of introducing this practice into the country’s agriculture. Four ponds, each with an area of 7.5 hectares, were involved. The research was carried out in two variants: in experiment No.1 rice was grown in the first year, fish in the second, then rice again and in the fourth year — fish, in the second experiment, on the contrary, at the beginning of the fish, then rice, etc. The fish-breeding season lasted 9 months (March to November). Fish-breeding indicators were studied in detail: survival rate, feed costs, fish productivity, the results of rice cultivation were judged by yield. In addition, indicators of economic efficiency were determined according to a simplified scheme. The results indicate that, in general, fish-breeding indicators turned out to be higher when growing fish in ponds after rice, so fish productivity increased by almost 30% with an average value of 3.9 t/ha, feed costs decreased, while rice yield increased by 15–16% and averaged 3.6 t/ha. The best fish-breeding indicators were obtained in the second experiment after rice was grown in the ponds for two years. Economic calculations confirmed the advantages of using the aquacrop rotation practice, so in the second experiment the cost of marketable fish decreased by 10%, and the profitability increased by almost 30%.

scholarly journals A new approach for the removal of unfixed dyes from reactive dyed cotton by Fenton oxidation

2019 ◽  
Vol 9 (2) ◽  
pp. 133-141
Author(s):  
Sana Islam ◽  
Irfan Ahmed Shaikh ◽  
Nabeela Firdous ◽  
Azhar Ali ◽  
Yumna Sadef
Keyword(s):  
Treatment Time ◽  
Color Difference ◽  
Quality Parameters ◽  
Water Levels ◽  
Fenton Oxidation ◽  
Color Strength ◽  
New Approach ◽  
Reactive Dyeing ◽  
The Difference ◽  
Day By Day

Abstract The use of fresh water in the textile wash-off process is becoming more expensive day by day due to declining water levels in the region. In this study, the potential of using Fenton oxidation in wash-off cotton reactive dyeing was investigated. The spent wash-off wastewater from one dyeing was first treated with Fenton oxidation, and then reused in several washing-offs employing widely used reactive dyes, C.I. Reactive Yellow 145, C.I. Reactive Blue 21, and C.I. Reactive Red 195. Experimental results showed that at acidic pH (3) using optimized quantities of FeSO4 and H2O2, Fenton process yielded a significant reduction (90–95%) of color in 30 minutes of treatment time. New washing-offs were then carried out in Fenton decolorized wash-off wastewater, and dyed cotton fabric samples were subjected to quality evaluations in terms of color difference properties (ΔL*, Δc*,Δb*, Δa*, ΔE*cmc) and wash fastness properties. This study concluded that after Fenton oxidation, treated liquor can be effectively reused subsequent washing-offs without compromising fabric quality parameters as ΔE*cmc was less than 1, and washing and crocking was also in the range of 4.5–5 which is commercially acceptable. Moreover, the difference in color strength in terms of k/s was also negligible.

scholarly journals Severe Drought in Finland: Modeling Effects on Water Resources and Assessing Climate Change Impacts

2019 ◽  
Vol 11 (8) ◽  
pp. 2450 ◽  
Author(s):  
Noora Veijalainen ◽  
Lauri Ahopelto ◽  
Mika Marttunen ◽  
Jaakko Jääskeläinen ◽  
Ritva Britschgi ◽  
...  
Keyword(s):  
Climate Change ◽  
Water Resources ◽  
Water Supply ◽  
Impact Analysis ◽  
Climate Change Impacts ◽  
Water Levels ◽  
Severe Drought ◽  
Climate Change Scenarios ◽  
Economic Sectors ◽  
The Impact

Severe droughts cause substantial damage to different socio-economic sectors, and even Finland, which has abundant water resources, is not immune to their impacts. To assess the implications of a severe drought in Finland, we carried out a national scale drought impact analysis. Firstly, we simulated water levels and discharges during the severe drought of 1939–1942 (the reference drought) in present-day Finland with a hydrological model. Secondly, we estimated how climate change would alter droughts. Thirdly, we assessed the impact of drought on key water use sectors, with a focus on hydropower and water supply. The results indicate that the long-lasting reference drought caused the discharges to decrease at most by 80% compared to the average annual minimum discharges. The water levels generally fell to the lowest levels in the largest lakes in Central and South-Eastern Finland. Climate change scenarios project on average a small decrease in the lowest water levels during droughts. Severe drought would have a significant impact on water-related sectors, reducing water supply and hydropower production. In this way drought is a risk multiplier for the water–energy–food security nexus. We suggest that the resilience to droughts could be improved with region-specific drought management plans and by including droughts in existing regional preparedness exercises.

scholarly journals Characterization of reservoirs for water supply in Northeast Brazil using high resolution remote sensing

RBRH ◽  
2017 ◽  
Vol 22 (0) ◽  
Author(s):  
Vladimir Fonseca Nascimento ◽  
Alfredo Ribeiro Neto
Keyword(s):  
Remote Sensing ◽  
Water Supply ◽  
River Basin ◽  
Storage Capacity ◽  
Digital Terrain Model ◽  
Aerial Survey ◽  
Digital Cameras ◽  
Small Reservoirs ◽  
Terrain Model ◽  
The Difference

ABSTRACT This paper reports the application of information acquired by aerial survey to characterize water supply reservoirs in the Pajeú River Basin (Pernambuco State/Brazil). The survey was carried out with digital cameras of high spatial resolution and laser relief profiling (LiDAR technology). Two areas were selected to apply the remote sensing products. Small reservoirs in the Quixaba Creek Basin were identified based on their topographic characteristics. Given that the small reservoirs are “depressions” in the terrain, they can be “filled”, resulting in a new Digital Terrain Model (DTM). The difference between the filled DTM and the original DTM makes it possible to identify the reservoirs. A summary of the results is: 61 reservoirs were correctly detected; 18 reservoirs were not detected; 13 reservoirs were detected erroneously. In another application, the storage capacity of the reservoirs belonging to the hydrosystems of Pajeú River Basin was estimated. The storage in these reservoirs and maximum surface area were estimated using DTM and geoprocessing tools. From the total of 31 reservoirs evaluated, eight were completely empty at the time of the LiDAR data collection. The official registers reported 83.83 million m3 for the storage capacity of these eight reservoirs, whereas our applications estimated the value at 70.23 million m3. This difference is explained by the loss of volume in the reservoirs due to the process of sediment transport.

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