Field measurement of sediment critical shear stress in the modern Yellow River Delta

Zheng Jiewen; Jia Yonggang; Liu Xiaolei; Liu Baohua; Fu Tengfei; Zhang Liping

doi:10.3969/j.issn.0253-4193.2015.03.009

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Zheng Jiewen, Jia Yonggang, Liu Xiaolei, Liu Baohua, Fu Tengfei, Zhang Liping. Field measurement of sediment critical shear stress in the modern Yellow River Delta[J]. Haiyang Xuebao, 2015, 37(3): 86-98. doi: 10.3969/j.issn.0253-4193.2015.03.009

Citation:

Zheng Jiewen, Jia Yonggang, Liu Xiaolei, Liu Baohua, Fu Tengfei, Zhang Liping. Field measurement of sediment critical shear stress in the modern Yellow River Delta[J]. Haiyang Xuebao, 2015, 37(3): 86-98. doi: 10.3969/j.issn.0253-4193.2015.03.009

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Field measurement of sediment critical shear stress in the modern Yellow River Delta

doi: 10.3969/j.issn.0253-4193.2015.03.009

1.
Key Laboratory of State Oceanic Administration for Marine Sedimentology and Environmental Geology, First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China;Key Laboratory of Marine Environment & Ecology, Ministry of Education, Ocean University of China, Qingdao 266003, China;
2.
Key Laboratory of Marine Environment & Ecology, Ministry of Education, Ocean University of China, Qingdao 266003, China;
3.
National Deep Sea Center, Qingdao 266003, China
4.
Key Laboratory of State Oceanic Administration for Marine Sedimentology and Environmental Geology, First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China;

Received Date: 2014-04-18

Abstract

Abstract

Cohesive sediment meter was used to measure sediment critical shear stress along the measuring line perpendicular to coastal line in different sedimentary lobes in the modern Yellow River delta. These obtained sediment critical shear stress,combined with the test results of sediment physical and mechanical properties and granularity composition,then were used to study on the distribution of sediment erodibility in the modern Yellow River Delta and its relationship with the influencing factors. This study indicated that,(1) high tidal flat was hard to be eroded with high critical shear stress ranging from 1.1 to 4.02 Pa,which was due to the following factors including the low water content,high dry bulk density,high content of silt and clay particles,small average particle diameter,and high undrained shear strength; (2) middle tidal flat was characterized with obviously different critical shear stress ranging from 0.10 to 1.90 Pa,which was mainly influenced by biological activities in different sedimentary lobes including biodisturbation,biological waste,remains and remnants with different amounts and degree; and (3) low tidal flat can be easily eroded with low critical shear stress ranging from 0.08 to 0.80 Pa,which was induced by the high water content,low dry bulk density,high sand content,gentle average particle diameter,and low undrained shear strength. For the whole modern Yellow River Delta,low,middle and high the critical shear stress occur in the northern part,middle part and the southern part of the delta,respectively. The discrepancy of particle compositions can be considered as the critical factor for causing the variety of sediment critical shear stress in different areas. Compared with other main estuarine deltas in the world,non-uniform degree of sediment erodibility was higher and anti-erosion strength was lower in the modern Yellow River Delta.
- critical shear stress,
- sediment,
- cohesive strength meter,
- estuarine delta,
- erosion

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References(37)

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