Effect of errors in the initial data on the accuracy of determination of horizontal displacements of hydraulic structures

1970 ◽  
Vol 4 (8) ◽  
pp. 729-730
Author(s):  
I. E. Donskikh
Keyword(s):  
Initial Data ◽  
Hydraulic Structures ◽  
Horizontal Displacements

scholarly journals The Application of Public Data in Forensic Real Estate Valuations: Problems, Limitations, Opportunities

2019 ◽  
Vol 14 (1) ◽  
pp. 24-29
Author(s):  
A. Yu. Butyrin ◽  
V. M. Kruglyakova ◽  
I. A. Shipilova
Keyword(s):  
Real Estate ◽  
Initial Data ◽  
The Body ◽  
Legal Authority ◽  
Data Completeness ◽  
Legal Proceedings ◽  
Public Data ◽  
Judicial Proceedings ◽  
Forensic Expert

One of the problems with the practice of legal proceedings is the determination of the legal authority limits of a forensic expert when he forms an array of initial data, the structure and content of which would provide a full and comprehensive research of the issues put before him by the body (person) having appointed the examination. The possibility of the specifed initial data completeness ensuring is suggested and substantiated in the article, arguments arising from the provisions of the law concerning neutralization of the traditional criticism directions of the expert in this part during his interrogation in the course of judicial proceedings on his conclusion are adduced.

scholarly journals The regularities of resistance and flow in pipes and wide channels

2018 ◽  
Vol 193 ◽  
pp. 02034
Author(s):  
Ilya Bryansky ◽  
Yuliya Bryanskaya ◽  
Аleksandra Оstyakova
Keyword(s):  
Comparative Analysis ◽  
Velocity Profile ◽  
Hydraulic Resistance ◽  
Cross Section ◽  
Resistance Coefficient ◽  
Hydraulic Structures ◽  
Hydraulic Characteristics ◽  
Hydraulic Resistance Coefficient ◽  
Logarithmic Velocity Profile

The data of hydraulic characteristics of flow are required to be more accurate to increase reliability and accident-free work of water conducting systems and hydraulic structures. One of the problems in hydraulic calculations is the determination of friction loss that is associated with the distribution of velocities over the cross section of the flow. The article presents a comparative analysis of the regularities of velocity distribution based on the logarithmic velocity profile and hydraulic resistance in pipes and open channels. It is revealed that the Karman parameter is associated with the second turbulence constant and depend on the hydraulic resistance coefficient. The research showed that the behavior of the second turbulence constant in the velocity profile is determined mainly by the Karman parameter. The attached illustrations picture the dependence of logarithmic velocity profile parameters based on different values of the hydraulic resistance coefficient. The results of the calculations were compared to the experimental-based Nikuradze formulas for smooth and rough pipes.

scholarly journals A Method for Generating the Centerline of an Elongated Polygon on the Example of a Watercourse

2020 ◽  
Vol 9 (5) ◽  
pp. 304
Author(s):  
Elżbieta Lewandowicz ◽  
Paweł Flisek
Keyword(s):  
River Flow ◽  
Medial Axis ◽  
Hydraulic Structures ◽  
Vector Data ◽  
Triangulated Irregular Network ◽  
University Center ◽  
Medial Axis Transformation ◽  
Base Points ◽  
The City

The centerlines of polygons can be generated with the use of various methods. The aim of this study was to propose an algorithm for generating the centerline of an elongated polygon based on the transformation of vector data. The proposed method involves the determination of base points denoting the direction of river flow. These points were also used to map two polygon boundaries. A Triangulated Irregular Network (TIN) was created based on the polygon’s breakpoints. Edges that intersect the river channel in a direction perpendicular to river flow (across) were selected from a set of TIN edges. The polygon was partitioned into segments with the use of the selected TIN edges. The midpoints of selected TIN edges were used to generate the polygon’s centerline based on topological relations. The presented methodology was tested on a polygon representing a 15-km-long section of a river intersecting the city of Olsztyn (a university center). The analyzed river is a highly meandering watercourse, and its channel is narrowed down by hydraulic structures. The river features an island and distributary channels. The generated centerline effectively fits the polygon, and, unlike the solution modeled with the Medial Axis Transformation (MAT) algorithm, it does not feature branching streams.

scholarly journals RESEARCH ON THE SENSITIVITY OF MULTI- CRITERION EVALUATION METHODS/SENSIBILITÄTSUNTERSUCHUNGEN ZU METHODEN DER MEHRKRITERIELLEN ENTSCHEIDUNGEN

2001 ◽  
Vol 7 (4) ◽  
pp. 276-280 ◽  
Author(s):  
Friedel Peldschus
Keyword(s):  
Initial Data ◽  
Problem Solution ◽  
Linear Transformations ◽  
Optimal Sequence ◽  
Mixed Problems ◽  
Methods Of Evaluation ◽  
Minimisation Problem ◽  
Transformation Methods ◽  
Rational Behaviour

Investigations into the multi-criterion evaluations have been performed for different purposes for more than 30 years. Nevertheless, up to now there are no common rules how to apply multi-criterion methods of evaluation and how to interpret their results. But the solutions of the problem must be found. The investigations are based on the joint programme LEVI developed by the VGTU and the Leipzig HSTEC. In accordance with the programme, for solving the problem a matrix is created in which all solution variants are evaluated by the same criteria. For the transformation of initial data different methods are used. Besides, the problem solution may be oriented to a choice of a variant and the determination of an optimal sequence or to the determination of the rational behaviour balance of two adversely interested groups. The maximisation, minimisation and mixed problems are distinguished. In case of the last mentioned problems the meanings may be unsuitable and expressions about the maximisation or minimisation too strong. When solving the problem of maximisation by different transformation methods, similar curves are obtained and the results are not dispersed heavily. In case of the minimisation, when solving according to different transformations, a considerable deviation of results has been noticed. The investigations also disclosed that solutions may vary depending on the optimisation goal. Dispersion of results in case of minimisation is stronger than in case of maximisation. When analysing different transformations, the vectorial transformation is regarded as “neutral” and there is no sense to include it into comparison. In case of the minimisation problem, linear transformations should be investigated in a more detailed way.

scholarly journals Study of Unbiased Plotting Position Formulae for the Generalized Extreme Value (GEV) Distribution

2021 ◽  
Vol 6 (4) ◽  
pp. 94-99
Author(s):  
Itolima Ologhadien
Keyword(s):  
Distribution Model ◽  
Hydraulic Structures ◽  
Accurate Estimation ◽  
Gev Distribution ◽  
Pearson Type ◽  
Type 3 ◽  
Best Fit ◽  
River Niger ◽  
Annual Maximum Series

The determination of appropriate quantile relations between the magnitude of extreme events and the corresponding exceedance probabilities is a prerequisite for optimum design of hydraulic structures. Various plotting position formulae have been proposed for estimating the exceedance probabilities or recurrence in. In this study, eight plotting position formulae recommended for GEV distribution were used for estimating the exceedance probabilities of annual maximum series of River Niger at Baro, Kouroussa and Shintaku hydrological stations. The performance measures of PPCC, RRMSE, PBIAS, MAE and NSE were calculated by applying their individual equations to each pair of observed AMS, arranged in ascending order, and exceedance probabilities calculated using each plotting positions. The result of the study show that Weibull was the best plotting position formula, seconded by Beard and thirdly, In – na and Ngugen. This study underscores the necessity to accurately size water infrastructure. In a recent paper, the author found GEV distribution the best – fit probability distribution model in Nigeria. Thus, the need to develop indepth understanding and accurate estimation of exceedance probabilities and return periods using the GEV distribution. Furthermore, this paper recommends similar studies to be conducted for Pearson Type 3(PR3) and Log Pearson Type 3 (LP3) distributions.

Investigation of an algorithm for analyzing deformations of geodetic points when observing horizontal displacements of hydraulic structures

2017 ◽  
Vol 925 (7) ◽  
pp. 23-30
Author(s):  
Yu.I. Markuze ◽  
Anh Cuong Le
Keyword(s):  
Personal Computer ◽  
Horizontal Displacement ◽  
Hydraulic Structures ◽  
Huge Number ◽  
Geodetic Measurements ◽  
The Stability ◽  
Horizontal Displacements

In recent years, many hydraulic structures have been modernized and built in Vietnam. Monitoring the deformations of hydraulic structures are extremely important. The results of observations of deformations to assess the stability and safety of structures help specialists make the process of construction and reconstruction of hydraulic structures more reliable and safe. At present, a personal computer is very widely used in processing the results of geodetic measurements. By using algorithms on a computer, we can simply and quickly solve problems with a huge number of calculations. The article deals with the application of a recurrent way of equalizing for the analysis of deformations of geodetic points when observing horizontal displacement of hydraulic structures in Vietnam. The use of the proposed algorithm in this article is conveniently implemented in practical calculations using a computer. The result of the calculation of the example indicates that combining the observation cycles to increase the accuracy of the observed items.

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