Wyniki wyszukiwania - BazTech

1

Low cost artificial recreational coastal lagoon: Hydrographic, and design guidelines in development resorts

El Gohary Rasha I.M.

Journal of Water and Land Development

|

2020

|

no. 46

45--59

EN

The objective of the research is to find low cost alternative for conventional recreational lagoons that consume water and energy used for desalination which is the only alternative for water treatment in most touristic villages all over the world. The study uses low cost recreational lagoon with new technology that use brackish water from deep wells and purify this water before entering the lagoon by controlled pulses and energyefficient ultrasound filtration. This allows to maintain the water within predefined parameters, guaranteeing standardized water quality in all lagoons. The research introduces the lagoon new technology and its low cost design including feeding and drainage wells, second, the hydrographic surveying for the coastline in the study area, third water quality modelling for the production and injection wells, fourth, use SOBEK 1-2 Mathematical Model for determine the water depth and perspective water volume for the designed lagoon. The aim of this model: Determine the relation between the water depth and the water volume for the canal and the lakes. Second, calculate the evaporation rate from the surface, Determine the number and capacity of the water wells needed to fill the canal and the lakes, and Find out the relationship between the discharge and the time needed to circulate the water in the canal and the lakes to keep their water quality. The results of the measurements from the observation well prove that the optimal discharge per each well is 0.022 m3·s–1. The construction of suggested new green technology lagoon are very low cost, completely environmentally friendly, in addition fulfils the highest standards of environmental safety.

2

Development of a relationship between hydrometric and hydrographic observations to predict reservoir capacity loss

Jabbar Y. C., Yadav S. M.

Acta Geophysica

|

2019

|

Vol. 67, no. 5

1451--1469

EN

Accuracy of reservoir capacity loss estimation on daily timescale is dependent on the certainty of sediment load prediction, density estimate and capacity observed by consecutive hydrographic surveys. Data-scarce and uncertain data conditions restrict the development of a relationship between hydrographic surveys and hydrometric observations. The present study has been carried for Ukai Reservoir, India. A novel sediment rating curve ftting approach by optimization technique has been proposed in order to accurately predict sediment load from low-frequency sampled discharge and sediment concentration observations. The study demonstrates the validation of the bulk density estimate using statistical hypothesis testing and identifes the correctness of the hydrographic survey results. Application of the developed hydrometric and hydrographic relationship indicated that about 50% of the capacity loss of a year might occur during a single extreme event. The proposed approach can serve as a decision support system to monitor and manage sedimentation for the reservoir having uncertain data conditions.

3

Availability of the GNSS geodetic networks position during the hydrographic surveys in the ports

Specht C., Makar A., Specht M.

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

|

2018

|

Vol. 12, no. 4

657--661

EN

Geodetic network GNSS receivers are more commonly associated with positioning systems used in maritime hydrography. In terms of positioning accuracy when no terrain obstacles are present, they meet international hydrographic surveys standards (S‐44) fully. Those standards are defined as 1m (0.95) for Exclusive Order and 2m (0.95) for Special Order. It is equally as important to ensure access to position which error is not higher than above mentioned maximum values. This is most often determined by the density of port infrastructure. This article presents the results of analysis of availability of hydrographic system that operates based on geodetic GNSS networks. Hydrographic surveys in question were undertaken in inner basins with diverse infrastructure. Three representative types of ports were selected for this reason: fishing type (Hel), medium sized, modern commercial type (Gdynia) and highly congested, narrow canal type (Gdansk – Motlawa). A nonpublic, geodetic GNSS network was used for all surveys. It is worth mentioning that the above network is at the moment the only available network that provides both GPS and GLONASS corrections. The surveys provided evidence that geodetic GNSS networks can be successfully utilised to determine position of hydrographic vessel in low and moderately developed ports as well as in Exclusive and Special Orders. In highly congested ports however, the availability of the above mentioned method of measurement can be insufficient to realise a survey.

4

Automatyczna detekcja obiektów sonarnych

Wąż M., Grządziel A., Nowak D.

Acta Scientiarum Polonorum. Geodesia et Descriptio Terrarum

|

2013

|

Vol. 12, nr 1

29--41

PL

Współczesne systemy sonarowe wykorzystywane są głównie do poszukiwania i wykrywania obiektów podwodnych, które mogą wpłynąć na bezpieczeństwo pływania i postoju jednostek pływających. Zadaniem operatora takich systemów jest optymalne ustawienie zobrazowania oraz odpowiedni dobór parametrów operacyjnych umożliwiających detekcję ech a następnie identyfikację wykrytych celów. Operator dokonuje korekty uzyskanych danych sonarowych, poprawiając tym samym jakość zobrazowania i możliwości interpretacji wyników pomiarów. W artykule rozpatrywanym problemem badawczym jest przekształcanie obrazów, dokonywanie korekcji geometrycznej oraz ekstrakcja obiektów z tła obrazu sonarowego. Zaprezentowana metoda automatycznego wyszukiwania obiektów wykorzystuje cechy morfologiczne sonogramów oraz geometryczne i arytmetyczne metody przetwarzania sygnałów stosowane do obróbki i analizy obrazów cyfrowych. Na etapie wyszukiwania cech obiektów sonarowych wykorzystano metody minimalno-odległościowe stosowane w rozpoznawaniu obrazów. Opracowana aplikacja umożliwiła przeprowadzenie eksperymentu badawczego przedstawiającego kolejne etapy detekcji obiektów sonarowych. Otrzymane wyniki mogą wskazywać na poprawność przyjętych założeń do badań oraz poprawność ich przeprowadzenia.

EN

Contemporary sonar systems are used mainly to search for and detect underwater objects which might affect the safety of navigation or the safety of moored watercraft. The task of the sonar operator is to display the optimal settings of the sonar image and to select the proper operational parameters that enable detection and identification of hidden targets. The operator performs corrections of the recorded sonar data, thereby improving the image quality and the ability to interpret the survey results. The paper deals with the research problem of changing display images, conducting geometric corrections, and extracting objects from the sonar imagery background. The presented method for the automatic searching of objects utilizes the morphologic features of sonograms and geometric and arithmetic methods of digital signal processing. In searching for the features of a sonar target, the minimal-distance methods used in pattern recognition were applied. The developed application makes it possible to perform research experiments that follow the stages of sonar detection of objects. The obtained results can indicate the validity of the research assumptions and the appropriateness of the methods used.

5

Development of a Method for the Estimation of Multibeam Echosounder Measurement Accuracy

Maleika W.

Przegląd Elektrotechniczny

|

2012

|

R. 88, nr 10b

205-208

EN

This article presents a method developed for the estimation of measurement error values (and their distribution) that occur in the process of marine sounding by a multibeam echosounder. The method, based on real data obtained in a specific marine environment, yields much more precise information on measuring instrument accuracy. The author also describes research done on a test set of more than 280 million measurement points covering an area of 20 km2. The obtained results are presented and interpreted.

PL

W artykule przedstawiono opracowaną metodę szacowania wartości błędów pomiaru (oraz ich rozkładu) powstających w procesie sondażu morskiego z wykorzystaniem echosondy wielowiązkowej. Metoda ta bazując na rzeczywistych danych uzyskanych w określonym środowisku morskim i daje dużo precyzyjniejsze informacje o dokładności pomiarowej urządzenia. W artykule opisano także badania jakie wykonano na zbiorze testowym ponad 280 mln punktów pomiarowych z obszaru 20 km2. Otrzymane wyniki zaprezentowano i zinterpretowano.

6

WGS-84 ellipsoid as vertical reference system for hydrographic surveys

Makar A.

Reports on Geodesy

|

2007

|

z. 2/83

95-101

EN

Depth measurement, as an element of hydrographic surveys, is realised in local reference system connected with a hydrographic vessel. Taking echosounder transducer's draught into consideration enables determination of the distance between water surface and the bottom. Sea level is changeable, especially in tide areas, even during hydrographic surveys. This fact created the necessity to work out many vertical reference systems. In tideless areas MSL - Mean Sea Level is generally used. Alternative for many vertical reference systems can be determination of the depth on reference ellipsoid using geopotential model of the Earth. This solution enable use of positioning systems for depth measurements and reduction of heaving.

7

Badania identyfikacyjne oraz inspekcja wraku "Graf Zeppelin"

Grządziel A., Olejnik A., Szymaniak R.

Polish Hyperbaric Research

|

2007

|

Nr 4(21)

17-30

PL

W lipcu 2006 roku ORP "Arctowski" z dZH MW dokonał identyfikacji zalegającego na dnie Bałtyku od prawie 60- ciu lat wraka niemieckiego lotniskowca "Graf Zeppelin". Na wraku przeprowadzono szereg prac hydrograficznych z wykorzystaniem opuszczanych i holowanych urządzeń pomiarowych. W roku 2007 ORP "Lech" z dOW 3 FO dokonał nurkowej inspekcji tego wraku na prośbę Urzędu Morskiego w Gdyni. W artykule przedstawiono przebieg i wyniki realizacji powyższych prac.

EN

In July 2006, ORP "Arctowski" from Hydrographic Suport Squadron of the Polish Navy made the identification of the German aircraft carrier "Graf Zeppelin" wreck, that has been laying on the Baltic bottom for 60 years. The wreck was surveyed with several towed and lowered measuring equipment. In 2007, ORP "Lech" from dOW ( 3 FO) carried out a diver inspection at request of The Maritime Office in Gdynia. The process of surveying and its final results have been presented in this article.

8

Two-frequencies bathymetry of Plitvice Lakes

Pribicevic B., Medak D., Dapo A., Medved I.

Reports on Geodesy

|

2006

|

z. 1/76

99-102

EN

Faculty of Geodesy, University of Zagreb, recently acquired the latest technology for performing the precise hydrographic surveying. The equipment consists of ATLAS DESO 14 surveying echosounder with two transducers: one with high frequency (210 kHz) and second with low frequency (33 kHz). The position of the transducer is determined with Real Time Kinematics GPS pair of Trimble R8 receivers. Thus, it is possible to use single-frequency DESO 14 for two-frequencies bathymetry through repeating the course of the vessel on exactly the same points with both transducers. The results of the application of this method in measuring two lakes in the National Park Plitvice Lakes are shown in this paper.

9

Geowizualizacja hydrograficznych danych pomiarowych

Grabiec D., Hac B., Szatan M.

Roczniki Geomatyki

|

2005

|

T. 3, z. 1

59-63

PL

W referacie zaprezentowano współczesne możliwoci hydrografii morskiej w zakresie pozyskiwania i przetwarzania danych pomiarowych z wykorzystaniem sonarów i echosond wielowiązkowych. Przedstawiono rezultaty prac własnych uzyskane, oryginalne efekty przetwarzania danych georeferencyjnych w postaci mozaiki dna, map hybrydowych, element elementów wizualizacji 3D oraz animacji komputerowej wybranych obszarów dna morskiego elementów obiektów podwodnych (wraki). Ukazano rolę i znaczenie tych opracowań w pogłębieniu wiedzy człowieka o obiektach podwodnych oraz ułatwieniu ich identyfikacji i weryfikacji.

EN

Contemporary possibilities of the hydrography in collecting and processing of the survey data from sonar and multibeams echosounders are described in this paper. Our own research results original effects of processing geodata as a mosaic of the sea bottom, hybryd-charts, elements of 3D visualization and computer animations of selected areas of the sea bottom and underwater objects (wrecks). The paper shows the role and significance of this presentation in broadening our knowledge about underwater objects and in facilitating identification and verification of them.

10

Usage of camera system for determination of pitching and rolling of sounding vessel

Naus K., Makar A.

Reports on Geodesy

|

2005

|

z. 2/73

301-307

EN

In this article the description of usage of two cameras for determination of pitching and rolling of sounding vessel has been presented. The description includes presentation of the method of placing and calibration video cameras on the sounding vessel and the method of determination of pitching and rolling on the basis of images obtained using these cameras. The basis of this method is relationship between horizontal line of the image and the horizon line with relation to pitching and rolling.

11

Correlation of hydrographic surveys obtained using large sounding vessels

Makar A., Naus K.

Reports on Geodesy

|

2005

|

z. 2/73

309-318

EN

Reliability of navigational charts and cells of electronic one depends on accuracy of determination of position and depth measurements, which can be obtained using DGPS, GPS-RTK and EGNOS during positioning and using hydrographic echosounder during depth measurement. The essential factor, which influences on hydrographic measurements, is correlation of determined position with position of the reflecting point on the bottom, where acoustic wave is reflected, especially during disrupted moving of the sounding vesseI. In this article the method of compensation of disruptions of the sounding vessel and correlation measured parameters during hydrographic surveys has been presented.