Wyniki wyszukiwania - Biblioteka Nauki

1

Report on the activities of the Research Expedition of the Polish Academy of Sciences to Spitsbergen 1982/1983

100%

Rudowski S.

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1985

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tom 06

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nr 4

2

Morpholithodynamic conditions of the tip of the Hel Peninsula, the Baltic Sea

63%

Rucinska-Zjadacz M. , Rudowski S.

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nr 2

3

Surveys of the shore and seafloor of the Kepa Redlowska area conducted by the Division of Marine Geology between 1997 and 2007

63%

Rudowski S. , Leczynski L.

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nr Suppl.1

135-146

4

Sedimentary structure of the storm surge washover fan on the lake Bukowo spit

63%

Rudowski S. , Wróblewski R.

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tom Vol. 29, No. 3

101-107

EN

A storm surge washover fan on the Lake Bukowo spit (kilometre 287.3 of the Polish Baltic coast) is described in detail. The in-depth examination of the fan relief and sedimentary facies allowed to identify two subfacies represented by the fan channel and the fan core. The importance of washover fan facies for the structure and development of sandy barriers as well as for shore sediment budget and shore protection is stressed.

5

Morpholithodynamic conditions of the tip of the Hel Peninsula, the Baltic Sea

63%

Rucińska-Zjadacz M. , Rudowski S.

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2015

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tom Vol. 44, No. 2

181--192

EN

The Hel Peninsula is a 35 km long spit that extends into water depths of almost 60 m. Unlike most sandy barriers, the distal end of the Hel Peninsula is prograding into the deep water. This affects unique conditions for the evolution of this section of the Peninsula. The aim of this study is to determine the morpholithodynamic changes on the tip of the Hel Peninsula. Shore studies were performed in 2006-2008 and 2012. Measurements included: beach profiling, determination of shoreline and dune base line positions, and collection of sediment samples. The different nature of the eastern, central and western part of the Hel tip is evident. The eastern part is accumulative, the central part is variable with the general nature of strong and differently directed redeposition and accumulative periods, while the western part is highly erosive.

6

The relief of the offshore sea bottom at Karwia-Chałupy, Polish Baltic coast

51%

Gajewski L. , Gajewski Ł. , Rudowski S. , Stachowiak A.

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tom Vol. 11

91-94

EN

Morphology of sea bottom of the Władysławowo area, from Karwia to Chałupy, has been studied based on the detailed digital bathymetric map prepared in a scale of 1:25 000 with isobaths every 0.25 m. A significant differentiation of the bottom relief has been observed, with the level changes up to 1-3 metres, mostly connected with the occurrence of specific systems of ridges and runnels. They are probably partly relict forms (fluvial and/or coastal?), changed to certain degree during the rapid stage of the Litorina transgression, and in partly forms created by the recent waves. Several types of the sea bottom surface, differing in pattern of morphological forms, have been recognised within inshore, near shore, and open sea (above 16 m depths) areas. The full knowledge of the origin and development of these relief forms requires further specialised research, currently carried out. Nonetheless, the already obtained picture of the sea bottom relief indicates an intensified abrasion of the offshore sea bottom, and an intensive, irreversible sweeping out of the sediments from the shore to the open sea, most probably by rip currents, at a distance up to several kilometres from the shore. It is in accordance with the results of a former large-scale (1:500) study of the sea bottom at the test field at Chłapowo, performed with the use of an integrated system of non-invasive and direct methods.

7

The dune coast : the state just prior to the construction of hard engineering protection structures (Ustka-Jarosławiec, the Southern Baltic)

51%

Sitkiewicz P. , Wróblewski R. , Rudowski S.

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tom Vol. 44, No. 3

352--361

EN

The state of a fragment of the southern Baltic Sea shore was assessed on the basis of historical maps, aerial images, the digital elevation model and the data on the geological structure of the nearshore bottom. The alternate erosion and accumulation sections of the coast were observed. They are moving toward the east related to the migration of mega beach cusps. The infrastructure of the military training ground located in the western part of the study area is threatened with abrasion. In 1889-2012, the nearby seashore retreated by an average of 257±11.5 m. The recorded average rate of changes for the period of 1989-2012 was -2.6±0.22 m year-1. In the eastern part of the study area, at the bottom of the nearshore, a thick layer of sand determines the development of new accumulation sections of the coast. The state of the seashore, recognized in this paper, will change due to the construction of four concrete sea-walls. Their operation will disrupt the natural processes described in these studies.

8

Application of the hydroacoustic methods to the detailed determination of the seafloor condition in the area of roadsteads and anchorages

51%

Rudowski S. , Gajewski L. , Jezionek E.

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tom Vol. 29, No. 3

85-92

EN

The detailed study of the bottom condition of the Anchorage No. 3 of the Gdynia roadstead is presented. The study applies the integrated system of the modern hydroacoustic methods (mainly a multi-beam echosounder, side-scan sonar and subbottom profiler). Results of the hydroacoustic recordings were interpreted using data from grab and core samples as well as a floor inspection done by ROV system of the underwater TV. The morphology and character of the bottom were recognised thoroughly including effects of the human activity (dredging, trace of anchors, presence of anthropo-genic objects etc.). The digital bathymetric map and the map of surface sediments of the bottom test field were prepared. The bottom condition was determined as the area of the gravitational sedimentation of silty-clayey sediments, which have strongly changed anthropogenicly to the depth of 0.5-1.0 metre below bottom level. The obtained results point to the high efficiency of the applied research method. The conducted manner of recording, together with adequate calibration and equipment adaptation to the local conditions allow applying the methodology to future routine studies of the sea bottom for determination its condition. Also, a valuable cognitive material related to the geological structure of the bottom was collected.

9

Determination of nautical depth by density measurement and by acoustic sounding

51%

Gajewski L. , Morgas W. , Rudowski S.

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1999

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tom Vol. 26, No. 2

57--65

EN

Pilot investigations were carried out with the objective of testing the usefulness of measuring the density of the mud/water medium to determine nautical depths in the Port of Gdansk. Results show significallt differences between the nautical depth and the depth detennined by acoustic methods at loose bulk cargo terminals. It was also found that too large depth values were obtained when 33 kHz transducers were used. Applicability of acoustic profiling for distinguishing structure of deposits which must be dredged was tested.

10

Seismostratigraphy of bottom sea sediments in some areas of the Spitsbergen Archipelago

51%

Kowalewski W. , Rudowski S. , Zalewski S. M. , Zakowicz K.

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nr 1

11

The dune coast − the state just prior to the construction of hard engineering protection structures (Ustka-Jarosławiec, the Southern Baltic)

51%

Sitkiewicz P. , Wroblewski R. , Rudowski S.

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2015

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tom 44

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nr 3

12

Seismoacoustic studies within Wijdefjorden, Spitersbergen

51%

Kowalewski W. , Rudowski S. , Zalewski S. M.

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nr 3-4

13

Drogi spływu wód kształtowane przy krawędzi lobu Zatoki Gdańskiej w rejestracji sejsmoakustycznej

51%

Rudowski S. , Rucinska M. , Jachna A.

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2007

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nr 04

14

Fale piaszczyste na dnie głębokiego przybrzeża i ich rola w kształtowaniu brzegu

51%

Rudowski S. , Łęczyński Ł. , Gajewski Ł.

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2008

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tom Vol. 9

214--216

15

Seismoacoustic studies within flooded part of the caldera of the Deception Island, West Antarctica

51%

Kowalewski W. , Rudowski S. , Zalewski S. M.

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nr 3-4

16

Application of the hydroacoustic methods to the detailed determination of the seafloor condition in the area of roadsteads and anchorages

51%

Rudowski S. , Gajewski L. , Jezionek E.

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nr 3

17

An attempt to use a broadband acoustic signal for determining the dimensions of Baltic fish

51%

Klusek Z. , Szczucka J. , Rudowski S.

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nr 3

18

Relief and internal structure of the subaqueous sand dunes in the Vistula River mouth

45%

Wróblewski R. , Dworniczak J. , Rudowski S. , Lisimenka A. , Ofierska W.

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2018

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tom Vol. 33, No. 1

24--32

EN

This paper presents the results of bathymetric and seismoacoustic measurements carried out in the canal of the Vistula River mouth (pol. Przekop Wisły). The surveys were conducted with the use of a multibeam echosounder and a parametric sub-bottom profiler. It made it possible to obtain a high resolution bottom morphology measurement, and to identify and characterize an internal structure of subaqueous bedforms. Presence of multiple series of small to large dunes, with their length ranging from 5 up to 55 m and height from 0.1 up to 1.5 m, was established. They were composed mainly of poorly graded medium-grained sands. The nature of the sediment graining was relatively uniform. Significant diversity in terms of the formation sizes was observed, and itwas only loosely dependent on their depth and location within individual relief units. Collateral medium and small formations were found everywhere among the large formations. The bedforms consisted of well-developed steep cross-coset stratification structure. It has been ascertained that the cross-coset thickness of this formation was greater (or equal) than its height. The scope of this work is to identify the relief and structure of subaqueous dunes for the purpose of the assessment of flow properties and bottom conditions in both recent and palaeoenvironments. The obtained results are crucial for determining the state of the Przekop Wisły canal, indicating potential limitations to unconstrained flow of spate water and ice drifting as well as navigation conditions.

PL

Przedstawiono wyniki pomiarów fal piaszczystych występujących na dnie sztucznego kanału ujściowego rzeki Wisły (Przekop Wisły). Dno kanału pokrywają serie asymetrycznych fal piaszczystych, o długości do ok. 50 m i wysokości do ok. 1,5 m, zbudowanych z piasków średnio i gruboziarnistych, ze strukturą dobrze wykształconych zespołów stromego, skośnego warstwowania. Podstawę badań stanowiły rejestracje dna wykonane w 2013 roku z użyciem echosondy wielowiązkowej i parametrycznego profilowania sejsmicznego systemem SES. Zastosowanie echosond wielowiązkowej zapewniło możliwość prowadzenie pomiarów morfologii form w odniesieniu do obrazu rzeźby dna. Rejestracja SES posłużyła do rozpoznania i scharakteryzowania wewnętrznej struktury form. Określono relację fal piaszczystych względem uziarnienia osadu, położenia w obrębie jednostek rzeźby, głębokości oraz miąższości zespołów stromego, skośnego warstwowania. Stwierdzono duże zróżnicowanie wielkości form nie wykazujące ścisłej korelacji z głębokością czy położeniem w obrębie jednostek rzeźby. Wszędzie, oprócz form dużych, występowały również formy średnie i małe. Celem pracy jest rozpoznanie rzeźby i budowy fal piaszczystych dla oceny charakteru przepływu i stanu dna w środowiskach współczesnych i kopalnych. Uzyskane wyniki mają istotne znaczenie dla określania stanu kanału Przekop Wisły wskazując na ograniczoną możliwość zapewnienia swobodnego spływu wód wezbraniowych oraz lodu, a także na ograniczenie warunków nawigacyjnych.

19

Metody badań dna morskiego pod kątem szacowania zasobów kruszyw mineralnych w Zatoce Koszalińskiej

45%

Szefler K. , Hac B. , Rudowski S. , Gajewski L. , Gajewski Ł.

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tom R. 35, z. 4/1

371-379

PL

Przedstawiono możliwości dokładnego rozpoznania i kartometrycznego obrazowania dna w relacji do określania zasobów kruszyw mineralnych, z zastosowaniem zintegrowanego systemu nowoczesnych metod bezinwazyjnych. Stosowano zdjęcie dna echosondą wielowiązkową i sonarem bocznym, profilowanie sejsmiczne profilografem osadów, przegląd dna systemem telewizji podwodnej, pomiary magnetometrem. Wszystkie dane były zbierane i opracowywane przy dokładności pozycjonowania lepszej niż 0,2 m, prowadzonej w czasie niemal rzeczywistym. Przedstawione przykłady pochodzą z przygotowywanego do eksploatacji pola kruszywa w Zatoce Koszalińskiej. Uzyskiwane rezultaty dobitnie wskazują na konieczność odpowiedniego uwzględnienia użycia przedstawianych metod w odnośnych przepisach związanych z poszukiwaniem, rozpoznawaniem eksploatacją i monitoringiem złóż występujących na dnie morskim. Zdaniem autorów pierwszym etapem tych prac winno być obowiązkowe wykonanie pomiaru echosondą wielowiązkową a dalsze etapy zależeć będą od uzyskanego obrazu dna. Opracowania wykonane bez zdj ęcia echosondą wielowiązkową są niewiarygodne.

EN

The effects of the application of modern, integrated non-invasive measuring system to detailed recognition and mapping of the sea bottom in relation to determination of the mineral aggregates are presented. The bottom images obtained by Multibeam Echosounder and Side-Scan Sonar, seismic profiling by Subbottom Profiler, bottom inspection by underwater TV ROV system and magnetometer measurements were used. All data were collected and elaborated with precise positioning system, with precision better than 0.2 m, in nearly real time. Presented examples are situated within sandy/gravelly exploitation field in the Bay of Koszalin. The obtained results demonstrate the necessity to strongly demand the use of the adequate methods in regulations concerning exploration, exploitation and monitoring of the resources on the sea bottom. According to authors the first stage of the work must be to obtain bottom images by Multibeam Echosounder. The next stages will depend on the obtained bottom shape. The studies and measurements realized without Multibeam Echosounder images are not credible.

20

The Vistula Canal, the state after 120 years of activity

38%

Lisimenka A. , Wróblewski R. , Nowak J. , Rudowski S. , Kałas M. , Szefler K.

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tom Vol. 30, No. 1

164--166

EN

During the catastrophic flood caused by the ice dam in 1840, a new river mouth was created. Nevertheless some series of floods were observed in the next years. In order to facilitate of river waters run-off, the artificial crosscut was performed in 1891-1895 years. The artificial channel was opened in 31st of March 1895. Since, at the time of continuous exploitation of the channel, high effectiveness of the engineering project which is unique in the world scale has been confirmed. A permanent flood hazard for Gdansk city and adjacent lowland areas has been receded. Since this time, the external delta is being formed by acumulation of bed-loaded sediment that is transporting by the river. Consequently free run-off of the river water is reducing due to the external delta growing. During the years 2009-2014, detailed monitoring researches of the Vistula Canal as well as the Vistula River External Delta have been performed. The obtained results constitute a basis for the evaluation of flood risk in the area, as well as for prognosis of morphological changes of the Vistula River External Delta and sand supply to the Gulf of Gdansk. The state of the Vistula River mouth canal is briefly presented after 120 years of its history.

PL

Podczas katastrofalnej powodzi w 1840 roku doszło do utworzenia nowego ujścia, tak zwanej Wisły Śmiałej. W ciągu kolejnych lat nadal jednak wystepowały sytuacje powodzie. Podjeto wiec decyzję o wykonaniu odpowiedniego przekopu dla zapewnienia skutecznej ochrony przeciwpowodziowej. Przekop został otwarty 31 marca 1895 roku. Podczas kolejnych lat użytkowania Przekopu Wisły jego skuteczność została potwierdzona. Rumowisko piaszczyste wynoszone przez rzekę, składane przy jej ujsciu, zaczeło formowac stożek ujściowy – tak zwana zewnetrzną deltę.W miarę jej wzrostu następuje jednak zmiejszanie możliwości swobodnego spływu wód. W latach 2009-2014 przeprowadzono szczegółowe badania monitoringowe Przekopu Wisły i delty zewnętrznej. Uzyskane wyniki stanowią podstawę do oceny stanu przekopu i jego mozliwosci zapewnienia swobodnego spływu, wraz z prognozą zmian delty zewnetrznej i szacowniem ilosci dostarczanego materiału piaszczystego do Zatoki Gdańskiej.