长江口潮间带九段沙浅滩潮水沟形态分析  

A morphological analysis of tidal creek network patterns on the Jiuduansha Shoal in the Changjiang Estuary

作　　者：吴晓东[1] 高抒[1] 

机构地区：[1]南京大学海岸与海岛开发教育部重点实验室,南京210093

出　　处：《海洋学报》2012年第6期126-132,共7页

基　　金：国家自然科学基金重点项目(40830853)资助

摘　　要：潮水沟演化是潮滩滩面对环境动力和生物过程的适应,分析潮水沟的形态特征有助于反推解读滩面的响应机制。借助于滩面水位高程计算模型和参数统计分析,提出九段沙上沙滩面潮水沟存在集中和分散两种发育模式。与分散模式相比,集中模式的水动力条件更强,潮沟数量更少,等级更高,规模更大。在研究区内,单支潮水沟的汇水形式彼此不同,但两种模式的总体汇水形式相近,潮水沟均以显著线性关系随汇水面积增大而扩展,最后两侧滩面产生同等的沟化程度。Tidal creeks are important and distinctive features of coastal environments as they represent a basic circulatory system through which water, sediments, organic matter, nutrients and pollutants are trans- ported into and out of intertidal wetlands. Based on the simplified Poisson hydrodynamic model, a proce- dure is compiled to achieve the watershed delineation for every subnetwork and drainage scaling properties extraction in the tidal basin of Upper Jiuduansha in Changjiang Estuary. To summarize the calculated and statistical results, two different evolution patterns are defined. The ＂concentration pattern＂ is characterized by a single, strong-developed network with alarger drainage area, developing under stronger hydrodynamic conditions,while the ＂scattering pattern＂ is represented by several small-scale networks and a smaller drainage area. In the two patterns, tidal channels stretch linearly with the increasing drainage area, which is consistent with the nearly same degree of channelization within the study area.

关 键 词：潮水沟形态 潮间带浅滩 汇水距离 豪顿长度 泊松方程模拟方法 长江口 

分 类 号：P714.7[天文地球—海洋科学]