The fate of dumped sediments monitored by a high-resolution multibeam echosounder system, Weser Estuary, German Bight

Wienberg, Claudia; Dannenberg, Jens; Hebbeln, Dierk

doi:10.1007/s00367-003-0155-9

Cited by 16 publications

(8 citation statements)

References 17 publications

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“…The latter makes the situation quite complementary to the situation in the outer Weser estuary where significant tidal currents and dumped material consisting exclusively of sand lead to substantial erosion and net outward flux of the dumped material within weeks to few months (Wienberg et al 2004). …”

Section: Discussionmentioning

confidence: 98%

“…Wienberg et al (2004Wienberg et al ( , 2005a, for example, investigated morphological changes on a tidally influenced dumping site in the outer Weser estuary, surveying sand dunes with a height up to 3 m. Their results indicate that under the tidal forces the dumped material was removed from the dumping site within few months. Additionally, the dumped sediments had no persistent effect on the bedforms and even completely buried dunes began to regenerate within few months.…”

Section: Introductionmentioning

confidence: 99%

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On the morphological long-term development of dumped material in a low-energetic environment close to the German Baltic coast

Stockmann¹,

Riethmüller²,

Heineke³

et al. 2009

Journal of Marine Systems

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The development of the bed bathymetry of an experimental dumping area was followed over three and a half years by means of multibeam echosounder techniques. Two types of material were discharged in the bight of Mecklenburg in the Baltic Sea in approximately 20 m of water depth. One set of the discharges was 2900 m³ of glacial till and the other set was a 2400 m³ mixture of glacial till, sand and minor amounts of cohesive matter. Only approximately 2500 m³ (86 %) of the glacial till and 1500 m³ (63 %) of the mixed soil materials were deposited on the seabed. This means that already during the dumping process a considerable part of the sediment material drifted away. The glacial till formed crater-like rings of 30 m diameter with peaks up to 1.4 m above seabed, whereas the spatial structure of the mixed soil material was somewhat more diffuse, but with similar magnitudes in the peaks and troughs.The morphological changes were small and their quantification required a high measuring precision in the order of few cm in the vertical. The dominant processes of surface deformation was flattening of peaks and filling of troughs. The speed of this process decreased with horizontal 2 scale: structures of less than 4 m horizontal extension had a trend to disappear within less than five years, whereas structures of larger than 8 m extension showed little change and are estimated to remain detectable for many decades. In contrast to the reworking of the matter inside the dumping structures, no net transport of material out the dumping area could be detected.Extrapolating the observed morphological changes into the future it is estimated that without significant decrease in internal shear strength of the disposed till the structures will persist for at least 70 years. This can be attributed to the high internal stability of the dumped glacial till and the low hydrodynamic forces present at the seabed in this region.

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Section: Discussionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

On the morphological long-term development of dumped material in a low-energetic environment close to the German Baltic coast

Stockmann¹,

Riethmüller²,

Heineke³

et al. 2009

Journal of Marine Systems

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“…This technology is becoming a standard method of collecting bathymetric data to produce the highest quality navigational charts which would ensure the highest safety of navigation [14]. Their application is different: underwater construction [30], fish shoal monitoring [21], underwater archaeology, sanitation of underwater landfills [37]. Multi-beam EM 3002 D echo sounder was used in data collection process of the final stage.…”

Section: Multi-beam Echo Soundermentioning

confidence: 99%

GIS modelling of bathymetric data in the construction of port terminals - the example of Vlaška channel in the Port of Ploče

2019

IJEM

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In the era of diversification of cargo freight facilities, application of advanced geo-modelling and geo-design tools is an imperative. Particularly, in the case of the new construction or redevelopments of large port terminals, its infrastructure and facilities. The main objective of this paper is to demonstrate the importance of bathymetric survey as one of the contemporary tools utilised in the pre-construction phase of port terminals. Contemporary bathymetry provides complex digital modelling and determines the depth, morphology and sedimentology of the river, lake, dam or sea beds. When planning, designing and constructing port terminals, bathymetric surveys are the primary prerequisite, before any physical intervention or material excavation. In order to generate a precise digital model of the sea-bed morphology in its initial and final stage, and calculate the quantity of the excavated material (in m³), our research team used geo-statistic and deterministic interpolation models. Particular emphasis was placed on the Newton-Cotes model affecting the output result (excavated material volume). KEY WORDS: Port of Ploče, bathymetry, 3-D modelling, interpolation methods (IM), sea-bed, Vlaška channel.A. Šiljeg, B. Cavrić, I. Marić, M. Barada: GIS modelling of bathymetric data in the construction of port terminals -the example of Vlaška channel in the Port of Ploče, Croatia 18ENGINEERING MODELLING 32 (2019) 1, 17-37 port development is the optimal number and types of freight modes, with specific technical and technological characteristics. This results in the importance of planning the technical equipment of the port and its transhipment capacities [9].The maritime trade is in constant global expansion. In order to meet increased demands from technical, managerial and customer points of view, it needs constant adaptation. This entails more attention to port specialization, the construction of new terminals, and strengthening of intermodal traffic through the development of their transport network to service hinterlands and remote areas [16].The construction of new port terminals requires the implementation of a wide spectrum of different spatial interventions and activities. Some of these activities are: geodetic and bathymetric surveys, geophysical bedrock modelling, geotechnical sea-bed (sea-floor) modelling, climatological studies, seismic reports, definition of risk types and models of prevention, environmental impact assessment, wave disturbance predictions, determination of spatial requirements, development of protection measures (breakwater and slope protection), and many more [4,22,26]. Furthermore, special emphasis was placed on carrying out the process of digital modelling of the sea-floor topography, which sought to determine the importance and influence of userdefined parameters on output results. User-defined parameters are the variables in the process of digital relief model that are set by the user, and have an impact on the output result. These parameters include: selecting data collection methodol...

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“…그러나 이 연구들은 단 빔음향측심기 또는 천부탄성파 자료를 통한 2차적인 연구로 제한되었으며, 실질적인 층면구조를 파악하기 위한 기술적 한계를 가지고 있다. 그러나 최근 십여 년 동안 고정밀 위치정보 시스템과 함께 고정밀 다 중빔음향측심기술이 해저지형 연구에 많이 적용되었 다 (Knappen and Hulscher, 2002;Wienberg et al, 2004;Wienberg and Hebbln, 2005;Thornton et al, 2006;Kubicki et al, 2007;Li and King, 2007;Stockmann et al, 2009 (Flemming, 1988). (Fig.…”

Section: 서 론unclassified

Morphological Characteristics and Control Factors of Bedforms in Southern Gyeonggi Bay, Yellow Sea

Kum¹,

Shin²,

Jung³

et al. 2010

Journal of the Korean earth science society

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Morphological surveys of southern Gyeonggi Bay in the Yellow Sea were conducted for2 years (2006 and 2007) by using multibeam echosounder for investigating the morphological features of bedforms. The subaqueous dunes are shown in various shapes (A~F type) and continuous spectrum of heights and lengths of transverse-to-current dunes on the wide range of sedimentary types. The height-length power-law correlation of dunes is Hmean=0.0393L (r=0.66). The comparison between Flemming (1988)'s correlation and height-length correlation of this study indicates that the subaqueous dunes in the study area are equilibrated in the present hydrological and sedimentary environment. The major controlling factors to thedevelopment and maintenance of subaqueous dunes are both strong tidal currents and the abundant availability of sand. Marine sand mining, artificial impact, changes from the original shape to an irregular shape of the subaqueous dunes with a shorter wavelength and lower height, which has influence on the development and maintenance of bedform because it causes a decrease of the availability of sediment. Water depth and sedimentary characteristics, and othercontrolling factors seem to play limited roles in the development and maintenance of subaqueous dunes.

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The fate of dumped sediments monitored by a high-resolution multibeam echosounder system, Weser Estuary, German Bight

Cited by 16 publications

References 17 publications

On the morphological long-term development of dumped material in a low-energetic environment close to the German Baltic coast

On the morphological long-term development of dumped material in a low-energetic environment close to the German Baltic coast

GIS modelling of bathymetric data in the construction of port terminals - the example of Vlaška channel in the Port of Ploče

Morphological Characteristics and Control Factors of Bedforms in Southern Gyeonggi Bay, Yellow Sea

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