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Wyświetlanie 1-10 z 28
Tytuł:
Evaluation of uniform current dynamic effect in practical ship manoeuvring
Autorzy:
Artyszuk, J.
Tematy:
manewrowanie okrętem
prąd morski
ship manoeuvring
tide
Pokaż więcej
Wydawca:
Polskie Forum Nawigacyjne
Powiązania:
https://bibliotekanauki.pl/articles/320488.pdf  Link otwiera się w nowym oknie
Opis:
The dynamic model of the uniform current, as introduced in the previous paper of this volume, is assessed against a bit simpler approach called semi-dynamic one. In the latter, a ship is assumed to move in still water and the over ground movement is just computed after each iteration of the differential equations integration. The level of inaccuracy caused by the semi-dynamic method depends upon the manoeuvre type. Also, some aspects of ship berthing in the ahead uniform current are raised, and compared with different degrees of simplification as employed in the shiphandling practise while dealing with the current (referred to in general as the kinematic model).
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A uniform current in ship manoeuvring mathematical model
Autorzy:
Artyszuk, J.
Tematy:
manewrowanie okrętem
prąd morski
ship manoeuvring
tide
Pokaż więcej
Wydawca:
Polskie Forum Nawigacyjne
Powiązania:
https://bibliotekanauki.pl/articles/320492.pdf  Link otwiera się w nowym oknie
Opis:
Some essential aspects of mathematical modelling the uniform current dynamic impact on ship manoeuvring are discussed and assessed. a simulation of a pure drift, and such a drift coupled with a turning motion is next performed for a small tanker. The one-knot current gives rise to the maximum yaw velocity of order fifteen degrees per minute associated however with a relatively long response time.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
PACIFIC SEA LEVELS RISING VERY SLOWLY AND NOT ACCELERATING
Autorzy:
Parker, Albert
Ollier, Clifford
Tematy:
sea level rise
tide gauges
subsidence
Pacific Ocean
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Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Powiązania:
https://bibliotekanauki.pl/articles/1051047.pdf  Link otwiera się w nowym oknie
Opis:
Over the past decades, detailed surveys of the Pacific Ocean atoll islands show no sign of drowning because of accelerated sea-level rise. Data reveal that no atoll lost land area, 88.6% of islands were either stable or increased in area, and only 11.4% of islands contracted. The Pacific Atolls are not being inundated because the sea level is rising much less than was thought. The average relative rate of rise and acceleration of the 29 long-term-trend (LTT) tide gauges of Japan, Oceania and West Coast of North America, are both negative, −0.02139 mm yr−1 and −0.00007 mm yr−2 respectively. Since the start of the 1900s, the sea levels of the Pacific Ocean have been remarkably stable.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Analysis of Total Water Storage Changes Obtained from GRACE FO Observations over the Venezia Islands Area Supported with Additional Data
Autorzy:
Biryło, Monika
Rzepecka, Zofia
Tematy:
GRACE FO
total water storage
precipitation
evapotranspiration
tide gauges
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Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Powiązania:
https://bibliotekanauki.pl/articles/1838011.pdf  Link otwiera się w nowym oknie
Opis:
The Venezia Islands are a very special area from the hydrological point of view due to its water mass changes. Regular floods results in the need for the regular monitoring of water mass changes. For this purpose, a Gravity Recovery and Climate Experiment mission (GRACE) can be used as a source of data. The aim of the paper is to compare the latest results of the new GRACE FO observations. The comparisons were carried out all over Venezia Island using the L3 level, RL06 release data obtained with spherical harmonics degree and order extension of up to 120, by the three most important computational centres: JPL, GFZ, CSR. Results are compared to an average month values of precipitation and evapotranspiration and tide gauge data in the nearby area. Based on the research, no dependence between TWS and evapotranspiration and evapotranspiration change were found.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Seasonal and Tidal Influence on Surface Water Quality – A Case Study in the Hau River Segment, Vietnamese Mekong Delta Province
Autorzy:
Ni, Duong Van
Viet, Le Hoang
Ly, Nguyen Hong Thao
Tematy:
surface water quality
Hau Giang
season
discriminant analysis
tide
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Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Powiązania:
https://bibliotekanauki.pl/articles/2173269.pdf  Link otwiera się w nowym oknie
Opis:
The study aimed to evaluate the influence of seasons and tides on surface water quality of Hau River in Hau Giang province, Vietnam. The water quality data were collected at six locations at low tide and high tide. The monitoring parameters included pH, dissolved oxygen (DO), biochemical oxygen demand (BOD), chemical oxygen demand (COD), total suspended solids (TSS), ammonium (NH4+-N), nitrate (NO3--N), orthophosphate (PO43--P), total phosphorus (TP), total nitrogen (TN), iron (Fe) and Coliform. One-way analysis of variance (One-way ANOVA), cluster analysis (CA) and discriminant analysis (DA) were applied to determine the influence of tides and seasons on water quality. The surface water quality was compared with the national technical regulation on surface water quality in column A1 (QCVN 08-MT:2015/BTNMT). The results showed that surface water in the study area had organic pollution and high eutrophication potential. The BOD, COD, TN, TP, Fe and coliform parameters in low tide tended to be higher than those in high tide. Five parameters, including TSS, TP, TN, PO43--P and coliform had a significant difference between the wet season and the dry season by DA analysis. Cluster analysis classified the water quality into three clusters, mainly by the BOD, COD, TSS, PO43--P and Fe parameters. The study provides important information on the water quality of the Hau River in the Hau Giang province for water uses and monitoring.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
European vertical reference frame EVRF2007
Autorzy:
Łyszkowicz, A.
Bernatowicz, A.
Tematy:
vertical reference system and frame
levelling network
tide correction
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Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Powiązania:
https://bibliotekanauki.pl/articles/298430.pdf  Link otwiera się w nowym oknie
Opis:
In Poland at the end of 2013 was completed implementation of the European Vertical Refrence Frame EVRF2007 in the country. This frame is the result of twenty years of works of the Subcommittee EUREF IAG. The paper in a condensed way describes the successive stages of development of the EVRF2007 frame in order to allow the readers to understand its essence. In the first part of the work are given definitions and how the EVRF2000 frame has been implemented and then is described how the system has been improved. Then the EVRF2007 is characterized with particular attention paid to the vertical movements of the earth crust and tidal corrections.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dinoflagellate cyst assemblages across the Oxfordian/Kimmeridgian boundary (Upper Jurassic) at Flodigarry, Staffin Bay, Isle of Skye, Scotland – a proposed GSSP for the base of the Kimmeridgian
Autorzy:
Barski, M.
Tematy:
Skye
Scotland
green tide
dinoflagellate cysts
Oxfordian/Kimmeridgian boundary
Szkocja
Pokaż więcej
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Powiązania:
https://bibliotekanauki.pl/articles/2060961.pdf  Link otwiera się w nowym oknie
Opis:
Examination of seven ammonite-calibrated palynological samples across the Oxfordian/Kimmeridgian boundary in the Flodigarry sections at Staffin Bay, Isle of Skye, northern Scotland, has revealed dinoflagellate cyst assemblages in general terms in line with previous contributions. The sparse occurrence of Emmetrocysta sarjeantii, Perisseiasphaeridium pannosum and Senoniasphaera jurassica slightly above the proposed Oxfordian/Kimmeridgian boundary may be used as a palynological approximation of the base of the Kimmeridgian. The high abundance of tests resembling modern zygnemataceous chlorophycean alga Spirogyra in two samples above the Oxfordian/Kimmeridgian boundary horizon is probably associated with increased eutrophication and possible association with ‟green tides”. This bloom is proposed as a palynofloral proxy event for the boundary in the Flodigarry section. According to previous studies, various eutrophication events may have a correlation potential in Subboreal Europe.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Coldspot of decelerated sea-level rise on the Pacific coast of North America
Autorzy:
Parker, Albert
Tematy:
sea level
measurements
tide gauges
West Coast of North America
Pokaż więcej
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Powiązania:
https://bibliotekanauki.pl/articles/1052858.pdf  Link otwiera się w nowym oknie
Opis:
We show here the presence of significant “coldspot” of sea level rise along the West Coast of the United States and Canada (including Alaska). The 30-years sea level for the area are mostly falling also at subsiding locations as San Francisco and Seattle where subsidence is responsible for a long term positive rate of rise. The 20 long term tide gauges of the area of length exceeding the 60-years length have a naïve average rate of rise –0.729 mm/year in the update 30-Apr-2015, down from –0.624 mm/year in the update 14-Feb-2014. Therefore, along the West Coast of the United Statesand Canada the sea levels are on average falling, and becoming more and more negative.
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 28

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