| 摘要: |
| 通过对条子泥二分水滩脊的现场水文调查、滩面表层沉积物采样、断面高程测量等实测资料的分析整理,并结合近几十年来的遥感卫星图片资料,研究了条子泥二分水滩脊的地貌特征、沉积特征、水动力特征及其历史演变规律.结果表明:(1)二分水滩脊自西向东方向呈斜坡式下降,坡度约为0.64％,平均高程约为0.5m,脊部宽约1km,将条子泥沙洲分隔为南北两大地貌单元；二分水滩脊表层沉积物以砂质粉砂为主,自堤向海方向沉积物逐渐变粗.(2)测量期间落潮平均流速大于涨潮平均流速,流速自表层向下逐渐减小,涨、落潮最大流速均出现在表层；涨潮平均含沙量大于落潮平均含沙量,涨、落潮最大含沙量均出现在底层；涨潮单宽平均输沙量为1.30 kg,落潮为1.07 kg,表明沉积物来源丰富.(3)二分水滩脊位置并不固定,1974年以前二分水滩脊在蒋家沙-铁板沙一线近似呈直线条带状分布,此后逐渐北移,至2000年北移约15 kn至条子泥内缘区中部一竹根沙一线；2000年至今逐渐南移4.5 km. |
| 关键词: 二分水滩脊 地貌动力特征 条子泥沙洲 |
| DOI： |
| 分类号:P737 |
| 基金项目:国家自然科学基金资助项目(40806018); 江苏近海海洋综合调查与评价项目(JS-908); 中央高校基本科研项目(B1020098) |
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| Hydrodynamic-morphodynamic characteristics and evolution tendency ofthe Erfenshui water-dividing beach ridge of the Tiaozini tidal sandbank,Jiangsu coast,China |
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CHEN Jun,WANG Yi-gang,WEI Xiao-qing,ZHOU Yong
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CHEN Jun,WANG Yi-gang,WEI Xiao-qing,ZHOU Yong(College of Harbour,Coastal and Offshore Engineering,Hohai University,Nanjing 210098,China)
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| Abstract: |
| The Jiangsu coast area is controlled by the East China Sea progressive tidal wave and the Southern Yellow Sea rotary tidal wave.The two tidal wave systems coming from the opposite direction converge near the middle of a radiative sandy ridge.Under this special hydrodynamic condition,a large geomorphologic dynamic response system is formed in the tiaozini sandbank which is named Erfenshui water-dividing beach ridge.Using in situ measurements and some remote sensing satellite images,this paper discusses the g... |
| Key words: Erfenshui water-dividing beach ridge hydrodynamics and morphodynamics response Tiaozini sandbank |
