Regeneration of sand waves after dredging

Knaapen, M.A.F.; Hulscher, Suzanne J.M.H.

doi:10.1016/s0378-3839(02)00090-x

Cited by 71 publications

(72 citation statements)

References 29 publications

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“…The results show that the response of the system is such that it returns to its original state. These findings agree, at least qualitatively, with field observations (BOERS, 2005;KNAAPEN and HULSCHER, 2002;PATTIARATCHI and HARRIS, 2002). Thus, the system does not tend to a new equilibrium, which might have been expected in such a highly nonlinear system.…”

Section: Utrecht Modelsupporting

confidence: 81%

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Parallel Modeling Approach to Assess Morphological Impacts of Offshore Sand Extraction

Hommes¹,

Hulscher²,

Stolk

2007

Journal of Coastal Research

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In this paper, we focus on a complex management issue, namely the physical effects of a large-scale offshore sand extraction. For these kinds of issues there is no obvious morphological model available to answer all management questions. Therefore, we aim to answer as many management questions as possible, using a set of existing morphological models parallel to each other. In this way, we can support governments to assess applications for licenses for large-scale sand extraction. We investigate whether this parallel modeling approach is significantly more helpful in addressing the management questions than a single modeling approach. The management questions are translated into quantifiable variables, known as Coastal State Indicators (CSIs). We focus on three coastal user functions: coastal safety and maintenance, offshore infrastructure, and navigation. The selected morphological models are assessed on (1) their applicability to the CSIs and (2) the reliability of their predictions. We quantify the predictive power of the models based on these two parameters. We conclude that by using a parallel modeling approach it is possible to address more management questions effectively in comparison with using just the best single model. The use of this parallel modeling approach increases the predictive power significantly, here 35%. ADDITIONAL INDEX WORDS:

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Section: Utrecht Modelsupporting

confidence: 81%

“…Amplitude-Evolution Model KNAAPEN and HULSCHER (2002) developed a model to predict the regeneration of sand waves after dredging. Based on the findings of KOMAROVA and NEWELL (2000), they assumed that the growth of sand waves is described by the Landau equation.…”

Section: Behavior-oriented Modelsmentioning

confidence: 99%

Parallel Modeling Approach to Assess Morphological Impacts of Offshore Sand Extraction

Hommes¹,

Hulscher²,

Stolk

2007

Journal of Coastal Research

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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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“…Sand waves tend to regain their shape after dredging (Katoh and Kume 1998). Using an amplitude-evolution model based on the Landau equation, Knaapen and Hulscher (2002) were able to model this regeneration process correctly and concluded that the 4 application of their procedure was an important step for the optimisation of the maintenance dredging.…”

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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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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Regeneration of sand waves after dredging

Cited by 71 publications

References 29 publications

Parallel Modeling Approach to Assess Morphological Impacts of Offshore Sand Extraction

Parallel Modeling Approach to Assess Morphological Impacts of Offshore Sand Extraction

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

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

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