A Flexible System for Estimation of Infiltration and Hydraulic Resistance Parameters in Surface Irrigation

2017 ◽  
Vol 60 (4) ◽  
pp. 1223-1234 ◽  
Author(s):  
Eduardo Bautista ◽  
James L. Schlegel
Keyword(s):  
Hydraulic Resistance ◽  
Computer Software ◽  
Surface Irrigation ◽  
Modeling Tools ◽  
Flexible System ◽  
Irrigation Water Management ◽  
Volume Balance ◽  
Balance Analysis ◽  
Basin Irrigation ◽  
Model Computer

Abstract. Characterizing the infiltration and hydraulic resistance process is critical to the use of modeling tools for the hydraulic analysis of surface irrigation systems. Because those processes are still not well understood, various formulations are currently used to represent them. A software component has been developed for estimation of the parameters of infiltration and hydraulic resistance models. Infiltration computations rely on volume balance analysis. The software provides flexibility for defining the estimation problem with various data configurations. The procedure works with various infiltration and resistance formulations. Given the inherent inaccuracies of volume balance analysis, the software provides tools for identifying and correcting some of those inaccuracies. Computational tests are provided to illustrate the capabilities and limitations of the proposed procedures. Keywords: Basin irrigation, Border irrigation, Computer model, Computer software, Furrow irrigation, Model calibration, Surface irrigation, Water management, WinSRFR.

Investigation of various volume–balance methods in surface irrigation

2021 ◽  
Vol 14 (4) ◽  
Author(s):  
Hamid Reza Maghferati ◽  
Mohammad Mahdi Chari ◽  
Peyman Afrasiab ◽  
Masoomeh Delbari
Keyword(s):  
Surface Irrigation ◽  
Volume Balance

scholarly journals Effect of Fertigation on Yield, Water Use, Economics and Storability of Onion (Allium cepa) cultivated in Inceptisols

Agropedology ◽  
2019 ◽  
Vol 29 (2) ◽  
Author(s):  
K. D. Kale ◽  
◽  
D. D. Pawar ◽  
M.G. Shinde ◽  
◽  
...  
Keyword(s):  
Water Use ◽  
Drip Irrigation ◽  
Water Productivity ◽  
Sprinkler Irrigation ◽  
Soil Surface ◽  
Silty Clay ◽  
Surface Irrigation ◽  
Storage Losses ◽  
Irrigation Water Management ◽  
Effect On Yield

The field experiment was conducted to study the effect on yield, water use, economics and storability of onion during rabi season of 2014-17 at Interfaculty Department of Irrigation Water Management, MPKV Rahuri. The experiment comprised of 100, 80 and 60 per cent recommended dose of fertilizer through fertigation, irrigation N and K through drip and P application in soil, drip with conventional fertilizers application in soil, surface irrigation with conventional fertilizers as control and micro-sprinkler irrigation with 100 % RDF through fertigation. The drip irrigation was beneficial than surface irrigation in increasing the yield (78.8 %) and saving the fertilizer. The total seasonal water requirement in drip irrigation was 480.3 mm compared to 807.2 mm in surface irrigation. The drip irrigation with 100 % RDF though fertigation was profitable higher net seasonal income of Rs. 2,74,445 per ha, compared to control (Rs.1,41,955 per ha) with B:C of 4.62 and water productivity of Rs. 566 per mm of water used. The micro-sprinkler irrigation with 100 % RDF through fertigation had significantly maximum total storage losses of 21.10 per cent followed by surface irrigation with 100 % RD of conventional fertilizer (19.86 %) and drip irrigation with 100 % RDF through fertigation. The results revealed that drip fertigation with 100 % RDF through fertigation in 13 weekly splits as per schedule is the best treatment to improve the yield, economical returns and storability of onion (var. N-2-4-1) cultivated in silty clay loam soils of Western Maharashtra.

Structural Rehabilitation Analyses for a Romanian Cultural Heritage Building Located in Seismic Area

2017 ◽  
Vol 21 ◽  
pp. 196-203
Author(s):  
Vasile Mircea Venghiac ◽  
Cerasela Panseluţa Olariu ◽  
Mihai Budescu
Keyword(s):  
Computer Software ◽  
Fe Model ◽  
Nonlinear Fem ◽  
Modeling Tools ◽  
Historical Monuments ◽  
North Eastern ◽  
Structural Rehabilitation ◽  
Linear Behaviour ◽  
Heritage Building ◽  
Seismic Area

Structural rehabilitation, especially of historical monuments, is a difficult and widely treated subject in order to achieve a better insight regarding their seismic response. In Romania, a lot of historical monuments that require rehabilitation due to seismic actions are encountered. This paper aims to assess the effects of structural retrofitting on a historical monument located in Botoşani County, which withstood during its life cycle important earthquakes. The 20th century monument is located in a seismic active area of North – Eastern Romania, at a distance less than 300 km from Vrancea region where the epicenter of major earthquakes for the Eastern Europe is situated. Two hypotheses for the FE model of the structure were considered, namely with and without the rehabilitation solution. Nonlinear FEM analyses were performed in computer software environments. Using specific modeling tools of the computer program it is intended to simulate linear behaviour of masonry and global response of the structure. Comparisons between the two models were made. The results are used to validate the rehabilitation solution also consisting a source of information for its effects during structural lifetime cycle of the historical church.

Variable Multi-Channel High Frequency Signal Acquisition System

2013 ◽  
Vol 798-799 ◽  
pp. 515-519
Author(s):  
Yan Jun Zhang ◽  
Li Xia Di ◽  
Jing Cui ◽  
Jing Yang
Keyword(s):  
Real Time ◽  
High Frequency ◽  
Computer Software ◽  
Digital Signal ◽  
Storage Device ◽  
Signal Acquisition ◽  
Control Logic ◽  
Frequency Signal ◽  
High Frequency Signal ◽  
Flexible System

A flexible system to multi-channel high frequency signal acquisition and transmission was designed. The system took FPGA as the center control logic unit. It could realize real-time acquisition, conditioning, modulus conversion to multi-channel high frequency signal and sent the converted digital signal to the storage device through FIFO. The system could also realize the real-time monitoring, data unpacking and analysis to storaged data by using computer software. FPGA software design adopted VHDL language. The experiment results show that this data acquisition and transmission system is stable and accurate.

Optimisation of Tilt Angle for Different Photovoltaic Panels Under the Prevailing Environmental Conditions in Melbourne (Australia)

2012 ◽  
Author(s):  
Mir Akbar Hessami ◽  
Sophie Lamande
Keyword(s):  
Thin Film ◽  
Excellent Agreement ◽  
Tilt Angle ◽  
Environmental Conditions ◽  
Computer Software ◽  
Energy Generation ◽  
Pv System ◽  
Photovoltaic Panels ◽  
Model Computer ◽  
Good Agreement

The optimum tilt angle of a photovoltaic (PV) system was found by varying it between 9° and 49° at 5–10° increment over a period of three months and recording the output of the five different technologies installed. These technologies included mono-crystalline, poly-crystalline, HIT, thin film CdS/CdTe and thin film CIS modules. The yield and efficiency of these modules were determined experimentally and also by the SAM (Solar Advisor Model) computer software; these results correlated with each other to within ±15% with R2 = 0.72 (R = 0.85). This correlation improved when a longer period of time was considered in the simulations. An optimisation study found that the optimum fixed tilt angle was 31.8° for all technologies except thin film CIS modules for which the optimum angle was 27.9°. Furthermore, the yield of another PV system was recorded from April 2010 to July 2011 and compared with its prediction by the SAM simulations. It was found that there was an excellent agreement between the two sets of data. An optimisation study using SAM found that the increase in annual predicted energy generation as a result of changing the tilt of the panels from the current fixed value of 25° to the optimised tilt angle of 31.8° was only 1.1%. A similar optimisation study for a third PV system found that the increase in energy generation predicted after changing the tilt angle from 10°-12° to their optimum tilt angle was 1.9%. The optimum tilt angles found in this study were in good agreement with previous studies reported in the literature.

Pipeline Purging Principles and Practice

1996 ◽  
Author(s):  
James E. Johnson ◽  
Steven J. Svedeman ◽  
Christopher A. Kuhl ◽  
John G. Gregor ◽  
Alan K. Lambeth
Keyword(s):  
Computer Software ◽  
Cost Effective ◽  
Gas Industry ◽  
Mixing Parameters ◽  
Natural Gas Industry ◽  
Scientific Principles ◽  
Routine Basis ◽  
Gas Purging ◽  
Model Computer ◽  
Transmission And Distribution

Gas purging, a process of displacing one gas by another gas, occurs on a routine basis in the natural gas industry when pipelines are purged into and out of service. In a project sponsored by the Gas Research Institute and in cooperation with the American Gas Association (A.G.A.) the purging practices as outlined in the A.G.A.’s Purging Principles and Practices manual are being reviewed because many of today’s pipeline purging operations occur under conditions not addressed directly in the manual. The program focus is on the purging procedures outlined in Chapter 8 of the manual entitled Gas Transmission and Distribution Pipes. The technical objective of the project is to develop an understanding of the scientific principles upon which safe, practical purging practices can be based. Direct displacement and inert gas slug purging operations are explained in terms of dispersion and mixing parameters and their relationship to the gas velocity. Field data is compared to the results of an analytical mixing model. Computer software for planning safe and cost effective pipeline purges has been developed. Finally, recommendations for revising Chapter 8 of the A.G.A. manual are presented.

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