Temat: canal irrigation - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: An innovative idea: Injection valves for irrigation ducts
Autorzy:: Benin, Dmitrii M.
Snezhko, Vera L.
Powiązania:: https://bibliotekanauki.pl/articles/2174368.pdf
Data publikacji:: 2022
Wydawca:: Instytut Technologiczno-Przyrodniczy
Tematy:: automation
hydraulic engineering
hydraulic structure
hydraulics
irrigation
irrigation canal
valve
Opis:: More than 4.6 mln ha in the Russian Federation are irrigated. Their culvert hydraulic structures are part of network structures and are the most widespread. After the crisis of the 1990s, proper maintenance of many reclamation systems was impossible due to a lack of funds. This led to the loss of about half of the water taken from irrigation sources in irrigation canals. The planned increase in the technical level of irrigation systems requires the automation of the operation of both the entire system as a whole and separately located culverts. This will avoid significant losses of water supply for irrigation and prevent water shortages with the insufficient discipline of water users. Means of hydraulic automation of water supply are being installed on small irrigation canals in Russia. A water flow regulating valve is proposed, with no mechanical movinparts, and gates are not involved in the control process. The operation of the structure is based on the injection effect, in which excess water entering the downstream with a decrease in water consumption begins to circulate between the outlet section of the transit pipe and the diffuser at the end section of the valve. Using the methods of measuring hydrodynamics and the theory of jet devices, theoretical dependences were obtained, which make it possible to determine the main hydraulic characteristics of the structure. The design form of the flow part of the regulator has been developed and a physical model has been made. In a mirror hydraulic flume, the operation modes of the water outlet were studied with and without regulation. The actual values of hydraulic parameters were obtained, which confirmed the validity of the use of theoretical dependencies. The discrepancy between the theoretical and experimental results is within the experimental error. It has been proven that it is possible to circulate excess water between the downstream and intermediate pools of the regulator.
Źródło:: Journal of Water and Land Development; 2022, 54; 220--224
1429-7426
2083-4535
Pojawia się w:: Journal of Water and Land Development
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 2.

Tytuł:: Numerical investigation of root canal irrigation adopting innovative needles with dimple and protrusion
Autorzy:: Li, P.
Zhang, D.
Xie, Y.
Lan, J.
Powiązania:: https://bibliotekanauki.pl/articles/307257.pdf
Data publikacji:: 2013
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: dimple
protrusion
innovative needles
numerical simulation
passive flow control methods
root canal irrigation
wychylenie zębów
symulacja komputerowa
kanał zębowy
Opis:: As important passive flow control methods, dimples and protrusions have been successfully implemented via geometric modifications to manipulate flow fields to get a desired flow parameters enhancement. In this research, two novel needles were proposed based on a prototype by means of the dimple and protrusion, and flow patterns within a root canal during final irrigation with these needles were numerically investigated. The calculation cases consistent with the clinically realistic irrigant flow rates, which are 0.02, 0.16 and 0.26 mL s–1 are marked as case A, B and C, respectively. The characteristic parameters to estimate irrigation efficiency, such as shearing effect, mean apical pressure, irrigation replacement and fluid agitation, were compared and the optimal geometry in every calculation case was obtained. As shown from the results, flow rates and needle geometries were the causes of irrigation parameters variations. The sum of shear stress, irrigation replacement and fluid agitation were equal in the low flow rate case A, however, the needle with a protrusion on its tip had advantages in the three irrigation characteristic parameters above in calculation case B, and the needle with a dimple on its tip had advantages in calculation case C. Furthermore, the needles proposed did not give rise to the risk of irrigant extrusion. These needles can be better choices at larger flow rates. Therefore, needle geometry optimizations utilizing passive flow control methods are worthy to be investigated in the root canal irrigation enhancement.
Źródło:: Acta of Bioengineering and Biomechanics; 2013, 15, 1; 43-50
1509-409X
2450-6303
Pojawia się w:: Acta of Bioengineering and Biomechanics
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 3.

Tytuł:: An experimental study on the grape orchard: Effects comparison of two irrigation systems
Badania eksperymentalne w winnicy: Porównanie efektów nawadniania dwoma systemami
Autorzy:: Kadbhane, S. J.
Manekar, V. L.
Powiązania:: https://bibliotekanauki.pl/articles/292518.pdf
Data publikacji:: 2017
Wydawca:: Instytut Technologiczno-Przyrodniczy
Tematy:: agro climatic zone
canal irrigation
evapotranspiration
farm pond
table grape
water productivity
ewapotranspiracja
nawodnienia
produktywność wody
stawy w gospodarstwie
strefy agroklimatyczne
winorośl
Opis:: Table grape (Vitis vinifera cultivars) is a major cash crop in the Nashik district of India, which requires irrigation water throughout the year as per demand instantly. Canal irrigation is the adopted irrigation systems in the study area, but canal irrigation has got several serious disadvantages, such as mismatching rotation schedules and crop water demands, water allotment system and restrictions on the use of efficient irrigation methods. The storing the canal water in the farm pond instead of directly applying to the field using the free flooding method is alternate solution to overcome the disadvantages of the canal irrigation system. Once the canal water storing in the pond, it increases the possibilities to use the advance irrigation system like drip, subsurface, sprinkler etc. to enhance water use efficiency. The comparative study between the canal water directly applying for the field and canal water storing in the farm pond then use for irrigation, executed through the field experiments carried out on the grape orchard during a period April 2013 to March 2016. Results have been evaluated based on grape yield, water-productivity, berry size, and biomass. Water productivity (kg∙m^–3) with respect to water delivery to crop through the pond irrigation method was found 37% higher than the canal irrigation method during the study period. Based on the results, this study recommended the use of the farm pond to store the canal water and use it as per crop demand using advance irrigation systems.
Winorośl (odmiany Vitis vinifera) jest główną uprawą w dystrykcie Nashik w Indiach. Wymaga ona całorocznych nawodnień dostosowanych do chwilowego zapotrzebowania roślin. Na badanym obszarze stosuje się nawadnianie grawitacyjne, polegające na bezpośrednim dostarczaniu wody transportowanej kanałem pod uprawy winorośli. Metoda ta ma kilka wad, takich jak: niedopasowanie harmonogramu zalewów z potrzebami roślin, złożony system rozprowadzania wody i ograniczone możliwości stosowania wydajnych metod nawodnień. Przechowywanie wody dostarczonej kanałem w stawach zamiast bezpośredniego wylania na pola umożliwia ograniczenie wad nawadniania grawitacyjnego. Retencjonowanie wody w stawach umożliwi stosowanie zaawansowanych i wodooszczędnych sposobów nawadniania, takich jak: nawodnienia kroplowe, podpowierzchniowe lub deszczowniane. Porównawcze badania nad nawadnianiem bezpośrednio wodą z kanału i wodą wstępnie przetrzymywaną w stawach prowadzono w okresie od kwietnia 2013 do marca 2016 r. Rezultaty oceniano na podstawie produktywności wody, plonu winogron, wielkości gron i biomasy. Produktywność wody (kg∙m^–3) dostarczanej pod uprawy za pośrednictwem stawu była o 37% większa niż produktywność wody aplikowanej bezpośrednio z kanału. W oparciu o wyniki badań zalecono wykorzystanie stawów w gospodarstwie do przetrzymywania wody z kanału i zastosowanie jej zgodnie z wymaganiem roślin, stosując zaawansowane systemy irygacji.
Źródło:: Journal of Water and Land Development; 2017, 32; 41-51
1429-7426
2083-4535
Pojawia się w:: Journal of Water and Land Development
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 4.

Tytuł:: Calculation of effective hydraulic parameters of concrete irrigation canals
Autorzy:: Fatxulloyev, Alisher
Rakhimov, Qudratjon
Allayorov, Davronjon
Samiev, Luqmon
Otakhonov, Makhsud
Powiązania:: https://bibliotekanauki.pl/articles/2203516.pdf
Data publikacji:: 2023
Wydawca:: Instytut Technologiczno-Przyrodniczy
Tematy:: canal bottom relative width
concrete canal
irrigation canal
sediment transport capacity
sedimentation tank
best hydraulic section
trapezoidal shape
Opis:: When taking water from pre-mountain rivers, for transferring of large amounts of river sediments, rich in mineral fertilizers, along with water to crop fields through irrigation networks requires high sediment transport capacity and deformation resistance from irrigation networks. The projecting and construction of irrigation canals with these features in the foothills requires concreting the canal. The high content of river sediments in the Sokh River (5 kg∙m-3) and the low efficiency of the Right Bank Irrigation Reservoir (10-15%) require high hydraulic efficiency of water intake canals from this system. The main challenge is to reduce costs in concreted canals and ultimately ensure technical superiority. In the research were used generally accepted research methods in hydraulics, in particular field research and consequently, mathematical analysis. Kokandsay, Kartan and Bachkir irrigation canals were accepted as the object of research, the canals were designed on the basis of the best hydraulic section, the canal side slope was taken as a variable parameter and the technical and economic efficiency was checked using computer software. As a result, it was found that the consumption of concrete raw material for 1 running meter can save 0.2-0.3 m3, depending on the adoption of the canal side slope, the acceptance of the slope of the canal wall at values 1-1.5 will increase up to sedimentation 10%.
Źródło:: Journal of Water and Land Development; 2023, 56; 14--20
1429-7426
2083-4535
Pojawia się w:: Journal of Water and Land Development
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 5.

Tytuł:: Detection of infectious tobamoviruses in irrigation and drainage canals in Greater Poland
Autorzy:: Jezewska, M.
Trzmiel, K.
Zarzynska-Nowak, A.
Powiązania:: https://bibliotekanauki.pl/articles/66243.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: detection
reverse transcription polymerase chain reaction
tobamovirus
irrigation canal
drainage canal
virus
water-borne virus
Wielkopolska region
Greater Poland zob.Wielkopolska region
Opis:: Water samples were collected from irrigation ditches and drainage canals surrounding fields in southern Greater Poland. Initially, the samples were subjected to low and highspeed centrifugation and obtained pellets were used to perform biological assays. Viral identification involved biological, electron microscopic as well as molecular methods. The occurrence of Tobacco mosaic virus (TMV) and Tomato mosaic virus (ToMV) was demonstrated in 12 of the 17 examined water sources. The molecular analysis results showed TMV and ToMV co-infections in the analysed water samples. To our knowledge, this is the first report of tobamoviruses being found in environmental water in Poland.
Źródło:: Journal of Plant Protection Research; 2018, 58, 2
1427-4345
Pojawia się w:: Journal of Plant Protection Research
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Informacja

Wyszukujesz frazę "canal irrigation" wg kryterium: Temat

Źródło danych

Dostawca treści

Kolekcja

Rok wydania

Wydawca

Temat

Autor

Typ dokumentu

Język