江苏条子泥沙洲内缘区潮滩粒度特征及其影响因素  

GRAIN SIZE CHARACTERISTICS AND INFLUENCE FACTORS OF THE TIDAL FLAT DEPOSITS AT THE TIAOZINI SANDBANK,JIANGSU PROVINCE

作　　者：陈君[1] 陈宏友 徐国华 王义刚[1] 蔡辉[1] 

机构地区：[1]河海大学港口海岸与近海工程学院,南京210098 [2]江苏省农业资源开发局,南京210008

出　　处：《海洋地质与第四纪地质》2011年第6期21-26,共6页Marine Geology & Quaternary Geology

基　　金：国家自然科学基金项目(40806018);江苏近海海洋综合调查与评价项目(JS-908-01-02-01);中央高校基本科研费项目(B1020098)

摘　　要：条子泥沙洲位于江苏岸外辐射沙脊群的核心区,水动力条件独特,地貌复杂。利用2009年5月11日在条子泥沙洲内缘区3条断面的潮滩表层沉积物粒度资料,分析该区域潮滩沉积物的粒度参数特征、沉积物粒度组成及沿程变化等,探讨不同岸段的沉积特征与水动力环境特征的相关性,以及影响潮滩沉积特征的主要因素等。结果表明,潮滩沉积物以砂质粉砂为主,自堤向海由细变粗,平均粒径为4～6Φ,分选较好,正偏态,峰态尖锐,以跃移搬运为主;影响潮滩沉积的主要因素有沙洲潮沟系统的演变、不同时期的匡围工程、海岸盐沼发育等,其中不同匡围工程所形成的曲折人工岸线是导致潮滩沉积物差异特征性的主要原因。The Tiaozini sandbank is located in the center of the Radiative Jiangsu province, formed in a special hydrodynamic environment with c Sandy Ridges along the coast of omplex geomorphotogy. Surface sediment samples were collected from the tidal flat of the Tiaozini sandbank on May 11, 2009. Grain size parameters （i. e. mean size, sorting coefficient, skewness and kurtosis）, the composition of sediment and the elevation of tidal flat along three profiles were acquired. Our results indicate that the sediment consists of sandy silt coarsening seawards. It is about 4-6~ in mean size, and well sorted, with positive skewness and sharp kurtosis. Components of saltation dominate. The depositional features of the tidal flat deposits are mainly influenced by tidal creeks, tidal salt marshes, the erosion and deposition of the sand banks and land reclamation activities. Irregular coastlines caused by land reclamation in different periods are the main factor influencing the characteristics of the tidal flat.

关 键 词：粒度参数 潮滩剖面 潮沟系统 匡围工程 江苏条子泥沙洲 

分 类 号：P736.2[天文地球—海洋地质]