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Research Papers: Ocean Engineering

Sediment Characteristics as a Function of Variable Hydrodynamics in a Tidal Flat of the Yellow River Delta, China

[+] Author and Article Information
Jiewen Zheng

First Institute of Oceanography, SOA,
Qingdao 266061, China

Yonggang Jia

Environmental Science
and Engineering Department,
Ocean University of China,
Qingdao 266100, China;
Key Laboratory of Marine
Environment & Ecology,
Ministry of Education,
Ocean University of China,
Qingdao 266100, China
e-mail: yonggang@ouc.edu.cn

Xiaolei Liu

Environmental Science
and Engineering Department,
Ocean University of China,
Qingdao 266100, China

Hongxian Shan

Environmental Science
and Engineering Department,
Ocean University of China,
Qingdao 266100, China;
Key Laboratory of Marine
Environment & Ecology,
Ministry of Education,
Ocean University of China,
Qingdao 266100, China

1Corresponding author.

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received January 25, 2013; final manuscript received August 5, 2013; published online November 26, 2013. Assoc. Editor: Dong S. Jeng.

J. Offshore Mech. Arct. Eng 136(1), 011104 (Nov 26, 2013) (9 pages) Paper No: OMAE-13-1016; doi: 10.1115/1.4025547 History: Received January 25, 2013; Revised August 05, 2013

The role of hydrodynamics in the secondary reworking of sediment in a tidal flat of the Yellow River delta was studied. Field hydrodynamic conditions were measured in the study area, and subsurface and surface samples at selected points were collected. Laboratory analyses were performed to measure variations in the grain sizes, mineral constituents, and microstructures of the sediment. Moreover, fractal dimension calculations were introduced to obtain additional quantitative sedimentological data. The results of the studies indicate clear responses of the seabed sediment to variations in the hydrodynamic conditions both in the vertical profile and in a seaward transect and indicate that hydrodynamic changes can play a significant role in sculpting the topographic features of tidal flats.

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Figures

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Fig. 1

(a) Location of the field measurement and sampling area in the modern Yellow River Delta, China (changed from Wang et al. [21]). (b) Sketch map of general setting in situ, where the hydrodynamic measurements positions are marked with the solid circles, the drilling sampling points are surrounded by the ashen rectangles, and the surface sampling points are along the measuring lines AN and IJ.

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Fig. 2

The field photographs of the two parts in the study area. (a) case I, i.e., the north part; (b) case II, i.e., the south part.

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Fig. 3

Typical topographical feature of the two parts in the study area. (a) case I, i.e., the north part; (b) case II, i.e., the south part.

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Fig. 4

Grading curves along depths at study area of case I and case II

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Fig. 5

Variations of mean particle size and particle fractal value along depths at study area of case I and case II

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Fig. 6

Grading curves seawards along measuring lines at study area of case I and case II

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Fig. 7

Variations of mean particle size and particle fractal value seawards along measuring lines at study area of case I and case II

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Fig. 8

Percentage compositions of minerals of sediment samples at surface and depth of 40 cm at the study area of case I

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Fig. 9

Percentage compositions of minerals of sediment samples at surface and depth of 40 cm at the study area of case II

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Fig. 10

Vertical observation and horizontal observation of orientation angle distributions of sediment samples at the different depths of the study area of case I

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Fig. 11

Vertical observation and horizontal observation of orientation angle distributions of sediment samples at the different depths of the study area of case II

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Fig. 12

Variations of fractal values of distribution and orientation along depths at the study areas of case I and case II

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