Water distribution analysis of a linear move irrigator by aerial survey and RTK-GNSS monitors

2021 ◽  
Author(s):  
Moshe Meron ◽  
Assaf Chen ◽  
Onn Rabinovitz ◽  
Eliezer Traub ◽  
Valerie Levine-Orlov ◽  
...  
Keyword(s):  
Water Distribution ◽  
Aerial Survey ◽  
Distribution Analysis

Object-Oriented Hydroinformatics Tools for Water Distribution Analysis

1996 ◽  
pp. 401-417
Author(s):  
Petr Ingeduld ◽  
Vladimír Havlík ◽  
Stanislav Vanecek ◽  
Pavel Jiroušek
Keyword(s):  
Water Distribution ◽  
Object Oriented ◽  
Distribution Analysis

Spatial network generation tool for water distribution network design and performance analysis

2013 ◽  
Vol 13 (1) ◽  
pp. 1-19 ◽  
Author(s):  
Nemanja Trifunović ◽  
Bharat Maharjan ◽  
Kalanithy Vairavamoorthy
Keyword(s):  
Water Distribution ◽  
Real Life ◽  
Water Distribution Network ◽  
Distribution Analysis ◽  
Support Tool ◽  
Network Generation ◽  
Multiple Networks ◽  
Water Distribution Network Design ◽  
And Performance ◽  
Test Robustness

The research presented in this paper aims at the support tool for generation of multiple networks with preset or randomised properties. To explore particular phenomena, water distribution analysis may require a coherent set of cases. Readily available in the literature are simple synthetic networks used for benchmarking, either real-life cases that are too diverse in size and configuration. The network generation tool (NGT) developed on the principles of graph theory connects any seed of nodes prepared in EPANET modelling software, by avoiding pipe crossings or unnecessary duplications. The pipe properties can be assigned by specifying a range of arbitrary lengths and diameters, by using coordinates to calculate the lengths, or by genetic algorithm optimisation of initial diameters. Equally, the nodal elevations and demands are arbitrarily assigned when not predefined in EPANET. Several sets of networks have been generated, up to 200 junctions. To test robustness of the tool, 13,000 layouts of a 50-junction seed have been generated using different settings. NGT has been proven to be capable of executing this task mostly within a few minutes, producing network layouts that resemble those from practice.

Computer Techniques for Water-Distribution Analysis

1972 ◽  
Vol 64 (7) ◽  
pp. 410-417
Author(s):  
A. E. Becher ◽  
Gerald J. Bizjak ◽  
James W. Schulz
Keyword(s):  
Water Distribution ◽  
Distribution Analysis

scholarly journals Estimation of Cavitation Limits From Local Head Loss Coefficient

2008 ◽  
Vol 130 (10) ◽  
Author(s):  
Raúl Sánchez ◽  
Luis Juana ◽  
Francisco V. Laguna ◽  
Leonor Rodríguez-Sinobas
Keyword(s):  
Boundary Conditions ◽  
Distribution Systems ◽  
Water Distribution ◽  
Head Loss ◽  
Cavitation Number ◽  
Distribution Analysis ◽  
Simple Formulation ◽  
Vapor Cavity ◽  
Head Losses ◽  
Minimum Value

Cavitation effects in valves and other sudden transitions in water distribution systems are studied as their better understanding and quantification is needed for design and analysis purposes and for predicting and controlling their operation. Two dimensionless coefficients are used to characterize and verify local effects under cavitating flow conditions: the coefficient of local head losses and the minimum value of the cavitation number. In principle, both coefficients must be determined experimentally, but a semianalytical relationship between them is here proposed so that if one of them is known, its value can be used to estimate the corresponding value of the other one. This relationship is experimentally contrasted by measuring head losses and flow rates. It is also shown that cavitation number values, called cavitation limits, such as the critical cavitation limit, can be related in a simple but practical way with the mentioned minimum cavitation number and with a given pressure fluctuation level. Head losses under conditions of cavitation in sharp-edged orifices and valves are predicted for changes in upstream and downstream boundary conditions. An experimental determination of the coefficient of local head losses and the minimum value of the cavitation number is not dependent on the boundary conditions even if vapor cavity extends far enough to reach a downstream pressure tap. Also, the effects of cavitation and displacement of moving parts of valves on head losses can be split. A relatively simple formulation for local head losses including cavitation influence is presented. It can be incorporated to water distribution analysis models to improve their results when cavitation occurs. Likewise, it can also be used to elaborate information about validity limits of head losses in valves and other sudden transitions and to interpret the results of head loss tests.

Extended Global-Gradient Algorithm for Pressure-Dependent Water Distribution Analysis

2009 ◽  
Vol 135 (1) ◽  
pp. 13-22 ◽  
Author(s):  
Zheng Y. Wu ◽  
Rong H. Wang ◽  
Thomas M. Walski ◽  
Shao Y. Yang ◽  
Danniel Bowdler ◽  
...  
Keyword(s):  
Water Distribution ◽  
Gradient Algorithm ◽  
Distribution Analysis ◽  
Global Gradient Algorithm

Water Distribution Analysis in the Outer Perimeter Region of Technical PEFC Based on Neutron Radiography

2015 ◽  
Vol 162 (7) ◽  
pp. F677-F685 ◽  
Author(s):  
P. Stahl ◽  
J. Biesdorf ◽  
P. Boillat ◽  
J. Kraft ◽  
K. A. Friedrich
Keyword(s):  
Water Distribution ◽  
Neutron Radiography ◽  
Distribution Analysis ◽  
Outer Perimeter

A New System For Optomanual Semiautomatic Quantitative Image Analysis

1977 ◽  
Vol 35 ◽  
pp. 210-211
Author(s):  
H.P. Rohr
Keyword(s):  
Image Analysis ◽  
Volume Density ◽  
List Type ◽  
Distribution Analysis ◽  
Type Number ◽  
Point Counting ◽  
Human Eye ◽  
Quantitative Image ◽  
Point Density ◽  
Electronic Counting

Today, in image analysis the broadest possible rationalization and economization have become desirable. Basically, there are two approaches for image analysis: The image analysis through the so-called scanning methods which are usually performed without the human eye and the systems of optical semiautomatic analysis completely relying on the human eye.The new MOP AM 01 opto-manual system (fig.) represents one of the very promising approaches in this field. The instrument consists of an electronic counting and storing unit, which incorporates a microprocessor and a keyboard for choice of measuring parameters, well designed for easy use.Using the MOP AM 01 there are three possibilities of image analysis:the manual point counting,the opto-manual point counting andthe measurement of absolute areas and/or length (size distribution analysis included).To determine a point density for the calculation of the corresponding volume density the intercepts lying within the structure are scanned with the light pen.

Sign in / Sign up

Export Citation Format

Share Document