Experimental research on the marine hydrodynamic action on the consolidation process of the sediments in the Yellow River Estuary |
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| Authors: | Xiu-juan Yang Yong-gang Jia Xiang-ran Li Hong-xian Shanam |
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| Institution: | (1) State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, No. 19 Xinjiekouwai Street, Beijing, 100875, People’s Republic of China;(2) Institute of Water Resources, Chinese Academy of Hydraulic and Power, Beijing, People’s Republic of China;(3) Appraisal Center for Environment and Engineering, Ministry of Environmental Protection, Beijing, 100012, People’s Republic of China |
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| Abstract: | Based on the in-situ measurements, the impact of the marine hydrodynamics, such as wave and tide, in the rapidly deposited sediments consolidation
process was studied. In the tide flat of Diaokou delta-lobe, one 2 m×1m×1 m test pit was excavated. The seabed soils were
dug and dehydrated, and then the powder of the soil was mixed with seawater to be fluid sediments. And an iron plate covered
part of the test pit to cut off the effect of the marine hydrodynamics. By field-testing methods, like static cone penetration
test (SPT) and vane shear test (VST), the variation of strength is measured as a function of time, and the marine hydrodynamics
impact on the consolidation process of the sediments in the Yellow River estuary was studied. It is shown that the self-consolidated
sediments’ strength linearly increases with the depth. In the consolidation process, in the initial, marine hydrodynamics
play a decisive role, about 1.5 times as much as self-consolidated in raising the strength of the sea-bed soils, and with
the extension of the depth the role of the hydrodynamics is reduced. In the continuation of the consolidation process, the
trend of the surface sediments increased-strength gradually slows down under the water dynamics, while the sediments below
50 cm are in opposite ways. As a result, the rapidly deposited silt presents a nonuniform consolidation state, and the crust
gradually forms. The results have been referenced in studying the role of the hydrodynamics in the soil consolidation process. |
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| Keywords: | Yellow River estuary seabed soil marine hydrodynamics consolidation process |
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