海岸盐沼泥沙过程现场实验研究  

Coastal saltmarsh sediment processes:a field experimental study

作　　者：时钟[1] 杨世伦[2] 缪莘[2] 

机构地区：[1]上海交通大学港口与水利工程研究所 [2]华东师范大学河口海岸研究所

出　　处：《泥沙研究》1998年第4期28-35,共8页Journal of Sediment Research

基　　金：国家自然科学基金;国家教委资助优秀年轻教师基金

摘　　要：在长江口南汇东滩进行了现场水文泥沙观测取样，以探讨海岸盐沼植物的存在对潮间带细颗粒泥沙运动的影响。分别对光滩、海三棱草和互花米草亚环境近底层流速、瞬时水位和悬沙浓度进行了测定。结果表明：盐沼及相邻光滩近底流速通常小于５０ｃｍ／ｓ；盐沼内，植被的摩擦使近底流速减少１６％～７１％；波浪传入盐沼后能量迅速降低；盐沼中悬沙浓度较相邻光滩低。Field experiments were undertaken to examine hydrodynamic effects of estuarine saltmarsh canopies on intertidal fine sediment transport of the Changjiang Estuary.Near bed current velocity (u),water level and suspended sediment concentration were measured on the mudflat,in the skcirpus mariquete canopy and in the skpartina alterniflora canopy respectively.The near bed current velocity (u) was generally less than 50 cm/s in the saltmarsh canopies and on the mudflat.Hydrodynamic effects of coastal saltmarsh canopies reduced the near bed current velocity by 16%～71% within the coastal saltmarsh canopy.Suspended sediment concentrations were found to be lower within coastal saltmarsh canopies as compared with unvegetated mudflats.A conceptual model has been proposed for describing fine sediment transport processes on the intertidal saltmarsh and mudflat.

关 键 词：盐沼 海岸 悬沙浓度 流速 波浪 观测 泥沙运动 水文泥沙 水位 长江口 

分 类 号：TV142[水利工程—水力学及河流动力学] P512.2[天文地球—地质学]