| 黄河三角洲沉积物抗侵蚀性动态变化差异研究 |
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| 引用本文： | 郑杰文,贾永刚,刘晓磊,单红仙,杨忠年.黄河三角洲沉积物抗侵蚀性动态变化差异研究[J].岩土力学,2011,32(Z1):290-0296. |
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| 作者姓名： | 郑杰文 贾永刚 刘晓磊 单红仙 杨忠年 |
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| 作者单位： | 中国海洋大学环境科学与工程学院环境岩土工程研究所;中国海洋大学海洋环境与生态教育部重点实验室 |
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| 基金项目： | 国家自然科学基金项目(No.40876042,No.41072215);国家863项目(No.2008AA09Z109) |
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| 摘 要： | 为研究波浪循环荷载作用过程中,细粒土沉积物抗侵蚀性特征的演化及其发生机制,在现代黄河三角洲北部及东北部选择两个典型研究区(遭受严峻侵蚀的车子沟渔村试验区及基本处于侵淤平衡的黄河海港试验区)进行了一系列波浪荷载模拟试验、侵蚀水槽试验及沉积物物理力学性质测试。试验结果发现:原车子沟渔村试验区沉积物抗侵蚀性在无波浪荷载作用或较短的波浪荷载作用条件下,普遍高于黄河海港研究区,但由于其更显著的液化特性,该区沉积物抗侵蚀性更容易被波浪荷载作用降低,这是造成车子沟渔村研究区遭受严峻潮滩侵蚀的重要原因。另外,结合试验结果,对两个研究区沉积年代及沉积物粒度成分特征的分析可知,波浪荷载作用导致海床下部细粒物质向上输运这一次生改造作用加速了海床沉积物的"粗化"进程,从而推进海岸带地区细粒沉积物抗侵蚀性特征的演化。
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| 关 键 词： | 波浪荷载 临界剪应力 起动流速 物理力学性质 土体液化 |
| 收稿时间： | 2010-12-14 |
Discrepancy of sediment erodibility variation under waves at Yellow River delta |
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| ZHENG Jie-wen,JIA Yong-gang,LIU Xiao-lei,SHAN Hong-xian,YANG Zhong-nian.Discrepancy of sediment erodibility variation under waves at Yellow River delta[J].Rock and Soil Mechanics,2011,32(Z1):290-0296. |
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| Authors: | ZHENG Jie-wen JIA Yong-gang LIU Xiao-lei SHAN Hong-xian YANG Zhong-nian |
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| Institution: | 1. Environmental Geotechnical Engineering Institute, College of Environmental Science and Engineering, Ocean University of China, Qingdao, Shandong 266003, China; 2. Key Laboratory of Marine Environment & Ecology, Ministry of Education, Ocean University of China, Qingdao, Shandong 266003, China |
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| Abstract: | Two typical study areas (Chezigou fishing village subjected to serious erosion process and Huanghe Haigang remaining in the balanced state between erosion and siltation) were selected to conduct a series of experiments including wave-loading simulations, flume erosion tests and geotechnical tests aiming at studying the erosional characteristic evolution of fine sediment in the process of wave loading actions and exploring the evolutional mechanism. It is demonstrated that the sediment erodibility at Chezigou fishing village study area is widely higher than that at Huanghe Haigang both in the absence of wave action and weak wave conditions; however, with a more evident downward trend under wave loading due to the more significant liquefaction characteristics of fine soils in Chezigou fishing village, which can contribute to the serious coastal erosion this study area subjects to. Additionally, basing on the analysis of the sedimentation data and particle composition of the fine sediments in the two study areas, the reworking of wave loading to transport fine particles of the bottom sediment upward accelerates the coarsening process of seabed sediment, which promotes the evolution of sediment erodibility of fine soils in coastal areas. |
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| Keywords: | wave loading critical shear stress threshold velocity physico-mechanical properties soil liquefaction |
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