Assessing Surface Water Features Using Landsat-8 Oli And Sentinel-1 Satellite Images Case Study Sirdaryo Region,
2020
State Geodetic Inspection under the State Committee on Land Resources, Geodesy, Cartography and State Cadastre of the Republic of Uzbekistan
Assessing Surface Water Features Using Landsat-8 Oli And Sentinel-1 Satellite Images Case Study Sirdaryo Region, S.M. Muratov, Kh.A. Abdivaitov, Sh.F. Rahmatillayev
Irrigation and Melioration
Water resources have become a very big problem in every part of Uzbekistan for several decades. Water is used not only exclusively for agricultural development, but also for many other purposes, such as industrial and chemical activities. Therefore, it is important to study the properties of surface water objects using optical and microwave satellite images. The Syrdarya region was selected for research. Because in the past, there have been no studies of water bodies using satellite images. The article presents the results of studies on the assessment of water properties from optical and microwave satellite images. In research for optical …
Distribution Of Pressure And Specific Energy In The Twirled Stream For Confusor,
2020
Tashkent Institute of Irrigation and Agricultural Mechanization Engineers
Distribution Of Pressure And Specific Energy In The Twirled Stream For Confusor, A.A. Yangiev, D.S. Adjimuratov
Irrigation and Melioration
Article brings up the advantage of confusor part application in outflow part of vortex spillway, which may be more rational from the point of view of providing non-cavitation operation of flow swirler. Analytical design method and program developed is given of pressure and specific energy for aerated part of swirled flow in vortex spillway confusor part, which match with experimental results, it allows for fast and quite accurate realization of distribution analysis for pressure and specific energy in swirled flow along the length of the confusor for various rates of taper.
Economic Assesment Of The Impact Of Climate Factors On Wheat Yield In Samarkand Region,
2020
Tashkent State Agrarian University
Economic Assesment Of The Impact Of Climate Factors On Wheat Yield In Samarkand Region, Sh.B. Babakholov
Irrigation and Melioration
Agricultural production is highly vulnerable to climate shocks and predicted climate consequences may pose severe challenges to the resilience of Uzbek agricultural system, especially in terms of food security and income stability of rural producers. In this context, present study proposed to assess the impact of climate factors, such particular changes in mean temperature and rainfalls on total output of wheat-cultivating farmers in Samarkand region. By considering irrigation source and heterogeneous geography of the region, farmers engaged in wheat production were analyzed in two: upstream and downstream zones using Fixed effect panel approach. The empirical findings of study revealed that, …
Change In Level Water In Pumping-Plant Intake,
2020
Tashkent Institute of Irrigation and Agricultural Mechanization Engineers
Change In Level Water In Pumping-Plant Intake, R.R. Ergashev, B.T. Xolbutayev
Irrigation and Melioration
A decrease in the water level in the pump chamber of the pumping stations leads to the formation of whirlpools in front of the suction pipes. As a result of air intake, the pump unit operates in cavitation mode and their intensive wear occurs. As the data obtained from the Karshi machine channel show, mainly a decrease in design water levels in the downstream waters is observed at the first pumping station. Depending on the number of simultaneously operating pumping units, the minimum water level in the head pumping station should be from 4.5 m to 5.7 m. The received …
Modeling The Impact Of Changes In The Ground Water Level On The Stability Of Agricultural Landscapes Using Gis,
2020
Tashkent Institute of Irrigation and Agricultural Mechanization Engineers
Modeling The Impact Of Changes In The Ground Water Level On The Stability Of Agricultural Landscapes Using Gis, A.M. Arifjanov, L.N. Samiev, F.K. Babajanov, G.M. Xamdamova, Sh.N. Yusupov
Irrigation and Melioration
The article presents modern GIS methods for determining the stability of changes in irrigated areas and the depth of the ground water level.the most correct solutions are given in modeling this process. To distinguish agricultural landscapes, the classification of agricultural acreage in the lower part of the Amu Darya river region was made using 16-day periodic rasters 2017 of 2018 and the NDIS MOD13Q1 sensor of agricultural acreage, type NDVI. The annual change in the level of underground water in relation to the state of rivers and channels is analyzed. A steady change in agricultural acreage on the right Bank …
Determination And Assessment Of The Spatio-Temporal Changing Dynamics In The Groundwater Level And Mineralization In Irrigated Areas Under Climate Change (As An Example Of Syrdarya Province),
2020
Tashkent Institute of Irrigation and Agricultural Mechanization Engineers
Determination And Assessment Of The Spatio-Temporal Changing Dynamics In The Groundwater Level And Mineralization In Irrigated Areas Under Climate Change (As An Example Of Syrdarya Province), S. Khasanov, S. Adilov, R. Kulmatov
Irrigation and Melioration
In the irrigated lands of the Aral Sea Basin, salinization processes are taking place as a result of rising groundwater levels and increasing its mineralization due to the unsustainable use of water and land resources. This, in turn, leads to the withdrawing of arable land and a decrease in crop yields. This is especially the case in the irrigated areas of the lower reaches of the Amudarya and Syrdarya rivers, located in Uzbekistan, southern Kazakhstan, and Turkmenistan. This research was aimed to learn and evaluate the long-term changing behavior of groundwater level and mineralization in the irrigated areas of the …
Increasing The Efficiency Of Water Distribution Management When Operating Pumping Stations Of The Irrigation System,
2020
Research Institute of Irrigation and Water Problems
Increasing The Efficiency Of Water Distribution Management When Operating Pumping Stations Of The Irrigation System, O.Y. Glovatsky, R.R. Ergashev, B. Hamdamov, N.M. Ismailov, B.T. Kholbutaev
Irrigation and Melioration
The article is to control the parameters of the unsteady movement of water in the canals and the pumping station, which ensure the maintenance of the specified operating modes of the pumping stations under non-stationary conditions. To achieve this goal, it is necessary to solve the problems of coordinating the operating modes of the units of the head pumping station (PS) with the operating modes of the partitioning structures in the conditions of emptying and filling the ponds of the main canal with water. The article discusses the implementation of the method of water distribution control on the mathematical model …
Analysis Of Theoretical And Natural Field Studies Of Reservoir Silling,
2020
Tashkent Institute of Irrigation and Agricultural Mechanization Engineers
Analysis Of Theoretical And Natural Field Studies Of Reservoir Silling, A.M. Arifjanov, F. Gapparov, T.U. Apakhujayeva, S.N. Xoshimov
Irrigation and Melioration
The article developed a mathematical model of the processes of siltation of reservoirs, taking into account the energy state of the flow, and proposed a calculation method. In the process of siltation of the reservoir, the dependence of the volume on the change in the water level in the reservoir was estimated. On the basis of studies carried out in full-scale field conditions, the recommended calculation method is comparatively evaluated and analyzed. Field studies were carried out in the Chimkurgan, Tashkent and Yuzhno-Surkhan reservoirs. A relationship is obtained that expresses the dependence of the relative volume of siltation of the …
Planed Dimension Of Flow Deformed By A Single Dam That Is Impermeable To Water From The Body,
2020
Tashkent Institute of Irrigation and Agricultural Mechanization Engineers
Planed Dimension Of Flow Deformed By A Single Dam That Is Impermeable To Water From The Body, M.R. Bakiev, K.T. Yakubov, I.J. Asamatdinov
Irrigation and Melioration
Coastal erosion is a type of water erosion that causes significant damage to the national economy each year: leaching of overland coastal crops, failure of protective dams, destruction of irrigation canals, dilapidated buildings and structures, among others. To combat leaching, cross-dams are used which are waterproof and water-permeable. The aim of this work was to develop a method for calculating the planned dimension of compressed flow with a transverse dam, which included comparing the lengths of the upper and lower tilt zones, the boundaries of individual zones and the results of research in the laboratory and in nature. According to …
Research Of Energy Indicators Of Electric Drives With Frequency Converters (Frequency Converters) On The Operating Equipment Of Cotton Cleaning Plants,
2020
Tashkent Institute of Irrigation and Agricultural Mechanization Engineers
Research Of Energy Indicators Of Electric Drives With Frequency Converters (Frequency Converters) On The Operating Equipment Of Cotton Cleaning Plants, A.J. Isakov, B.K. Tukhtamishev, J.N. Tolipov
Irrigation and Melioration
The article deals with the theoretical and practical substantiation of the replacement of an unregulated electric drive of the main technological equipment of cotton refineries with a frequency-controlled electric drive. The influence of a change in the load on the motor shaft on the main parameters of the steady state is considered. In an asynchronous motor, with an increase in the load, slip increases to such a value at which the torque of the motor balances the increased moment of resistance. Considering that when the stator slip resistance is less than the critical one is a small fraction of the …
Water Quality Of The Kaparas And Channel Reservoirs At The Tuyamuyun Hydro Complex,
2020
Scientific Research Institute of Irrigation and Water Problems
Water Quality Of The Kaparas And Channel Reservoirs At The Tuyamuyun Hydro Complex, М. Ikramova, А. Khodjiev, I. Akhmedkhodjaeva
Irrigation and Melioration
The country's available water resources are consumed by various sectors of economy, such as industry, agriculture, energy, communal services. Due to the limited water resources, there are problems in proper water supply to the population. The article provides an assessment of the degree of mineralization and basic ions in the water of the Kaparas and Channel reservoirs based on field studies and laboratory analyses taking into account water volumes in the reservoirs and changes in water level. At the same time, it was identified that water quality exceeds standard indicators. For example, at using water for irrigation purposes salinity was …
Stabilization Of Discharge Processes Involved In Electrical Fields Of Electrostatic Precipitators,
2020
Tashkent Institute of Irrigation and Agricultural Mechanization Engineers
Stabilization Of Discharge Processes Involved In Electrical Fields Of Electrostatic Precipitators, Sh.M. Muzafarov, B.N. Erkinov, A.I. Pardaev, V.E. Baliskiy, B.К. Tаgaev
Irrigation and Melioration
The article provides information on achievements in the field of electrical gas cleaning. A critical analysis of the principle of operation of the electrostatic precipitators developed and currently in operation is carried out. The possibility of increasing the efficiency of electrical gas cleaning using unipolar voltage pulses is analyzed. A theoretical analysis of the processes in the discharge gap was carried out using the existing theory of electric discharges in gases. Based on the analysis of the data, the discharge mechanism is established in a sharply inhomogeneous electric field at a pulsed voltage. It is established that when using voltage …
Determination Of The Rational Values Of The Parameters Of The Disc Rollers Of The Combined Unit,
2020
Tashkent Institute of Irrigation and Agricultural Mechanization Engineers
Determination Of The Rational Values Of The Parameters Of The Disc Rollers Of The Combined Unit, A.K. Igamberdiev, D.K. Muqimova
Irrigation and Melioration
In our country, repeated crops are sown in newly plowed lands. In such conditions, the use of combined units that perform several technological operations simultaneously in one pass is considered effective. However, due to the inadequacy and validity of the parameters of the working bodies for the quality of pre-sowing tillage in newly plowed lands, there is an increase in the number of passes, fuel consumption, loss of soil moisture and other costs and, as a result, the possibility of timely sowing and friendly germination of repeated crops is reduced . The rational parameters of the new design of disk …
Autonomous Photovoltaic System For Year-Round Guarantee Supply Of Electricity To Rural Facilities,
2020
Physical-technical institute of SPA “Physics-Sun” of the Academy of Science of Uzbekistan
Autonomous Photovoltaic System For Year-Round Guarantee Supply Of Electricity To Rural Facilities, M.N. Tursunov, Х. Sabirov, U.R. Kholov, Т.Z. Аkhtamov
Irrigation and Melioration
The article discusses the physical and technical features of the experimental results of studying the parameters of an autonomous photovoltaic station (AFES) with a power of 2600 W designed and manufactured on the basis of 16 photovoltaic batteries made of polycrystalline silicon with an efficiency of 15.6 %. It is shown that an autonomous photovoltaic efficiently and reliably provides electric energy a lighting system for car parking in the winter season (January and February) and it is planned to lift water from a well with a depth of 70-80 m for irrigation and maintenance of the Heliopoligon from April 2020. …
Drought Frequency Analysis Based On The Development Of A Two-Variate Standardized Index (Rainfall-Runoff),
2020
Iran University of Science and Technology
Drought Frequency Analysis Based On The Development Of A Two-Variate Standardized Index (Rainfall-Runoff), Gholamreza Nikravesh, Mohammad Aghababaei, Mohammad Nazari-Sharabian, Moses Karakouzian
Civil and Environmental Engineering and Construction Faculty Research
Drought is one of the most drastic events, which has imposed irreparable damages on human societies and may occur in any climate regime. To define drought, given its properties of multidimensionality and randomity, one cannot rely on a single variable/index (e.g., precipitation, soil moisture, and runoff). Accordingly, implementing a novel approach, this study investigated drought events in two basins with different climatic regimes, using multivariate frequency analyses of drought duration, severity, and severity peak, based on developing a Two-variate Standardized Index (TSI). The index was developed based on the concept of copula, by applying rainfall-runoff data (1974-2019) and comparing them …
Permeable Road Pavement With Subsurface Precast Micro-Detention Storage: A Green Pavement Practice,
2020
Universiti Malaya
Permeable Road Pavement With Subsurface Precast Micro-Detention Storage: A Green Pavement Practice, Norazlina Bateni
Student Works (2020-2029)
Green infrastructure practices are uniquely applicable to address the relationship between land use and water resources through the replication of the natural hydrological process within the landscape. Implementation of such practices, especially green pavement can significantly improve the rainfall-runoff responses, and thereby minimise the occurrence of flood hazards, which may lead to uncountable economic losses. Common permeable pavements are typically composed of fine-layered particles attributed to low porosity. In this study, an innovative permeable pavement with a micro-detention pond storage (PPDS) system is proposed. It is a modified type of interlocking block permeable pavement consisting of a hollow cylinder with …
Historical Changes In Planform Geometry Of The Amite And Comite Rivers And Implications On Flood Routing,
2020
Louisiana State University and Agricultural and Mechanical College
Historical Changes In Planform Geometry Of The Amite And Comite Rivers And Implications On Flood Routing, Kathleen E. Harris
LSU Master's Theses
The Amite River Basin is a 2,220 square-mile basin spanning from southwest Mississippi through southeast Louisiana, encompassing Baton Rouge and its suburbs. In response to historic flooding in August 2016 and other major flood events in the past several decades, the basin has been the subject of a number of studies to quantify the impacts of changes in land-use and reduction in river length and sinuosity. However, there have yet to be relationships defined between the changes in the historical river planform and the resulting flow, stages, and subsequent flood depths. River lengths and sinuosity were measured from the 1930s …
St. Mary And St. Anne Cathedral, Cork: An Optimum Heating Solution For Heritage Buildings?,
2020
Department of Civil Structural and Environmental Engineering, Museum Building, Trinity College, University of Dublin, Dublin, Ireland
St. Mary And St. Anne Cathedral, Cork: An Optimum Heating Solution For Heritage Buildings?, Christopher Shiell, Roger P. West
Civil Engineering Research in Ireland 2020
Cathedrals and most churches are characterised by having large internal, undivided spaces and permeable building envelopes. They are often used little, intermittently, but predictably and, in spite of the fact that they are unique in still being largely used for the purpose for which they were built many centuries ago, they are now often used for additional purposes, for which they were never designed. These uses include concerts, graduation ceremonies, filming and a host of other uses all of which require a level of thermal comfort not envisaged by the original builders. Research was undertaken by the authors into the …
Challenges And Opportunities To Deep Retrofitting Of Traditional Fabric Buildings To Achieve Nearly Zero Energy Building (Nzeb),
2020
MaREI Centre for Energy, Climate and Marine, Ryan Institute & School of Engineering, National University of Ireland, Galway
Challenges And Opportunities To Deep Retrofitting Of Traditional Fabric Buildings To Achieve Nearly Zero Energy Building (Nzeb), Maria Lopez Zambrano, Paul Kenny, Jamie Goggins
Civil Engineering Research in Ireland 2020
Many of our traditional buildings are disappearing or in danger of being under utilised because they are not comfortable for modern day living and do not meet our present day needs. If a building does not have a use, inevitably it deteriorates and eventually becomes a ruin or gets demolished. It is important to retrofit these buildings, which are part of our identity and can be powerful tourist attractions even though most of them are not listed. Some owners want to apply for retrofitting schemes and grants, but they are rejected because there are no standard solutions to achieve low …
Teaching Of Structural Analysis Into The Future,
2020
Department of Civil, Structural and Environmental Engineering, Trinity College Dublin, Ireland
Teaching Of Structural Analysis Into The Future, Dermot O'Dwyer
Civil Engineering Research in Ireland 2020
The engineering curriculum has always been full. In the past civil and structural engineers studied a wide variety of technical subjects within the broad field of engineering science and spent many hours working on design projects. Modern engineering curricula try to cover these areas while also dedicating more time to structured group-work, report writing and communication skills. Although students spend longer in college the number and range of technical fields that students must master is considerably larger than in the past. As a result the time available to any one topic area has reduced. At the same time the work …
