长江口九段沙上沙潮滩沉积物短期时空变化特征  

Short-term Temporal and Spatial Characteristics of Tidal Flat Sediment in Upper Jiuduansha,Yangtze River estuary

作　　者：李平[1] 陈沈良[1] 谷国传[1] 孙瑛 陈秀芝 

机构地区：[1]华东师范大学河口海岸学国家重点实验室,上海200062 [2]上海市九段沙国家级湿地自然保护区管理署,上海200135

出　　处：《海洋通报》2008年第6期60-67,共8页Marine Science Bulletin

基　　金：我国近海海洋综合调查与评价专项(908-02-02-06);上海市科委重大科技攻关项目(04DZ12049)

摘　　要：根据2006年6月至2007年6月在长江口九段沙上沙潮滩两断面9个固定观测点逐月采集的108个表层沉积物样品的粒度测定,结合动力地貌过程分析了潮滩沉积物短期时空变化。结果表明:①潮滩沉积物在时间上具有明显的洪枯季变化:丰水期潮滩淤积,沉积物粒度较细;枯水期潮滩冲刷,沉积物粒度较粗。②流域来水来沙和风浪是沉积物年周期变化的主导因子,而台风浪是沉积物短期突变的决定性因子。③潮滩沉积物在空间上表现出明显的纵向差异和横向分异特征,这是由于人工抛石筑堤改变了潮滩泥沙来源及水动力条件。该研究结果可为河口湿地的保护和建设提供科学依据。The 108 surface sediment samples were monthly collected from June 2006 to June 2007 at nine fixed sampling sites of two profiles along Upper Jiuduansha of the Yangtze River estuary and the short-term temporal and spatial characteristics of tidal fiat sediment grain-size were studied combining with morphodynamic process. The results are as follows：① The tidal flat sediment grain sizes showed significant seasonal changes： the sediment sizes were finer during the tidal flat accretion period in flood season, and were coarser during the tidal fiat erosion in dry season. ② The wind-wave and runoff from the basin are two dominant factors for sediments annual change and the storm is the decisive factor for sudden change.③It shows the obvious longitudinal and lateral variation in space. The reason is that the construction of artificial riprap-embankrnent changed the way of sediment sources and hydrodynamic conditions. The study results can offer scientific reference for estuarine wetland protection and construction.

关 键 词：九段沙上沙 表层沉积物 粒度 时空变化 

分 类 号：P737.15[天文地球—海洋地质]