潮滩微地貌的声学观测与分析  

Acoustic observations and analysis of microreliefon tidal flats

作　　者：陈景东[1] 汪亚平[1] 朱庆光[1] 黄蓓[1] 吴自银[2] 高建华[1,3] 

机构地区：[1]南京大学地理与海洋科学学院,南京210093 [2]国家海洋局第二海洋研究所,杭州310012 [3]海洋沉积与环境地质国家海洋局重点实验室,青岛266061

出　　处：《南京大学学报（自然科学版）》2014年第5期611-620,共10页Journal of Nanjing University（Natural Science）

基　　金：海洋公益性行业科研专项经费(201105001-02,No.201105006);国家自然科学基金(41376044);海洋沉积物与环境地质国家海洋局重点实验室开放基金(MASEG201205)

摘　　要：于2013年6月8日至6月9日在江苏如东潮滩进行海底地貌与沉积动力学观测.采用"差值法"从声呐数据中提取底形信息,并分析底形演化与水动力、悬沙浓度的关系.底形数据结果表明,潮周期内底床形态变化明显;分析同步的沉积动力学观测数据发现,底床形态的起伏程度与流速呈正相关关系.随着流速增加,近底部水体悬沙浓度增加,底床形态起伏程度增加;流速减小,近底部水体悬沙浓度回落,底床形态的起伏程度降低.分别分析东西向与南北向底床起伏程度与流速的关系表明,流向对沙纹的起伏程度具有重要影响,垂直沙纹走向的水流会增大底床形态的起伏程度,平行沙纹走向的水流会减小底床形态起伏程度.The hydrodynamics andseabed morphology survey were carried out on the Rudong（Jiangsu）tidal flat in June 8and June 9,2013.The differencemethod were utilized to extract the bedform information from observed sonar data.Then arelationship was established between the bedform evolution and hydrodynamic/suspended sediment concentration.The changes in seabed morphology are significant within a single tidal cycle.In addition,apositive relationship was present between the seabed roughness and current velocity.As the current speed increased,the suspended sediment concentration near bottom and the seabedroughnessincreased,and vice versa.Finally,itconcluded that the current direction controlled theseabedroughness.The current crossing the sand ripple couldincrease the roughness of seabed whilethe current along the sand ripple coulddecrease the roughness.

关 键 词：潮滩 声呐 底形 水动力 悬沙浓度 

分 类 号：P737.1[天文地球—海洋地质]