Spatial and temporal variation of planktonic larvae and juvenile of bivalve Meretrix lamarckiion on the exposed sandy beach

裸露沙滩双壳文蛤浮游幼虫时空变化

• 批准号: 17560454
• 负责人: YAGI Hiroshi
• 金额: $ 2.24万
• 依托单位: Tokyo Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2005
• 资助国家: 日本
• 起止时间: 2005 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-17560454/
• 关键词: exposed sandy beach; Meretrix lamarckiion; beach process; dispersion of planctonic larvae; ALC fluorescent maker; headland defense works; nearshore currents; wind-driven currents

In order to understand the fundamental characteristics of movement and recruitment of planktonic larvae and juvenile of bivalve Meretrix lamarckiion on the exposed sandy beach, intensive field surveys and numerical modeling were performed in this study. In the field survey, spatial distribution of juvenile of Meretrix lamarckiion and beach profile changes were measured on the Ooarai coast in Ibaragi prefecture which is the most productive area of Meretrix lamarckiion in Japan. The field measurement results showed that the high density population of early stage juveniles distributed around the shoreline in autumn (recruitment), they moved to offshore region in winter and came back to the shoreline region in spring. This fact suggests that the juvenile of Meretrix lamarckiion seasonally change their habitat between the shoreline zone and offshore region. The fundamental characteristics of juvenile movement of short time scale in the shoreline zone were examined with the ALC fluorescent m … More arker experiment. On the other hand, in order to understand the behavior of planktonic larvae of Meretrix lamarckiion, the numerical model to simulate the dispersion process of planktonic larvae in the open coastal sea has been developed. This model consists of the hydrodynamic model which can simulate the processes from the shelf sea scale to surf zone scale, and planktonic larvae model which is based on the laboratory experiment by Higano et al, (1993). Numerical experiment results showed that the importance of surf zone vertical circulation. The planktonic larvae were trapped in the surf zone and prevented to outflow from the surf zone to offshore region due to the surf zone vertical circulation. Furthermore, the numerical experiments to examine the influence of the headland defense works showed that the offshore current induced due to the headland could outflow the planktonic larvae from the nearshore region. This fact suggests that the headland defense works have a large impact on the dispersion and recruitment process of planktonic larvae of Meretrix lamarckiion. Less

为了了解露出的沙质海滩上的浮游幼虫运动的基本特征和浮游生物幼虫的基本特征，以及在这项研究中进行了密集的现场调查和数值模型。在现场调查中，Meretrix Lamackiion少年和海滩轮廓变化的空间分布在伊巴拉吉公平的Ooarai海岸进行了测量，这是日本Meretrix Lamackiion生产力最高的地区。现场测量结果表明，早期少年的高密度种群分布在秋季的海岸线（招募），他们在冬季搬到了离岸地区，并在春季回到了海岸线地区。这一事实表明，Meretrix Lamackiion的少年在季节性改变了海岸线区和海上地区之间的栖息地。使用ALC荧光M…更多的ARKER实验检查了Shoreline区域中短期尺度运动的少年运动的基本特征。另一方面，为了了解Meretrix Lamarckiion的浮游幼虫的行为，已经开发了模拟浮游生物幼虫的分散过程的数值模型。该模型由流体动力学模型组成，该模型可以模拟从架子海量表到冲浪区量表的过程，以及基于Higano等人（1993）的实验室实验的浮游幼虫模型。数值实验结果表明，冲浪区垂直循环的重要性。由于冲浪带垂直循环，浮游幼虫被困在冲浪区中，并阻止从冲浪区到近海区域出口。此外，检查岬角防御工程的影响的数值实验表明，由于岬角引起的海上电流可能会从近海地区出现浮游生物幼虫。这一事实表明，岬角防御工程对Meretrix Lamarckiion浮游生物的分散和招募过程产生了很大的影响。较少的

项目成果

開放性海岸域におけるチョウセンハマグリ幼生の移流分散シミュレーション

沿海开放地区朝鲜蛤幼虫的平流和扩散模拟

• 发表时间: 2006
• 期刊: 土木学会第61回年次学術講演会講演概要集
• 作者: 瀬戸 徹;八木 宏;安井 進;日向野 純也
• 通讯作者: 日向野 純也

開放性海岸域におけるチョウセンハマグリ幼生の移流分散シミュレヘション

沿海开放地区朝鲜蛤幼虫的平流和扩散模拟

• 发表时间: 2006
• 期刊: 土木学会第61回年次学術講演会講演概要集
• 作者: 瀬戸 徹;八木 宏;安井 進;日向野 純也
• 通讯作者: 日向野 純也

Hydrodynamics and Transport Processes of Floating Bivalve Larvae in Open Coastal Zone

开放海岸带浮游双壳贝幼体的水动力和运输过程

• 发表时间: 2006
• 期刊: Proceedings of the 61st Annual Conference on Civil Engineering
• 作者: Seto T.;Yagi;H.;Yasui;S.;Higano;J.
• 通讯作者: J.