摘要
人工鱼礁上升流是流场区水体垂向交换、混合、循环的主要驱动因素之一,是人工鱼礁环境功能实现的基本环节。该研究通过数值实验方法获得4种投放量、7种布设间距共28种建设模式下米字型鱼礁上升流流场数据,提取并分析了代表流场作用能力的3个性能指标来评估上升流流场效应并准确定位上升流区,包括上升流,强度,范围及位置参数,进而为合理规划单位人工鱼礁建设模式提供参考。结果表明,4种投放量在0~1.5倍鱼礁单体边长(Sla)的布设间距下相对体积效率最佳,布设间距为0~1.5 Sla、投放量为432空m3时上升流平均相对速度最高;0与1.5 Sla布设间距下单位体积贡献率较高;1.0~3.0 Sla布设间距的上升流相对面积较高,对应相对面积高度基本相同,为0.5~1.0。进一步以不同海域上升流作用形式差异为出发点,指出确定上升流区的新思路,并提出以上升流流场最佳效应为前提的最优单位人工鱼礁建设模式选择方法。
The upwelling area of artificial reefs is the main factor of vertical mixing,exchange and circulation of water in the flow field area,which is key to realize the function of artificial reefs.This study proposes three performance indicators that represent the ability of the flow field to evaluate and accurately locate the upwelling area,so as to plan the unit artificial reef construction mode rationally.This results show that the relative volume efficiency index of the four kinds of throw amount is optimal at the laying distance of 0–1.5 Sla(Side length of artificial reef).When the laying distance was 0–1.5 Sla and the throw amount was 432 m3,the average relative velocity index was the highest.Higher velocity contribution rate of unit volume index was observed at 0 and 1.5 Sla.The relative area of the 1.0–3.0 Sla laying distance was greater,and the corresponding relative height of area was basically the same(0.5–1.0).Taking the difference of the action modes of upwelling in different seas as starting point,new ideas for determining the upwelling area are pointed out,and the method of determining the optimal unit artificial reefs construction mode based on the optimal effect of the upwelling flow field is proposed.
作者
郭禹
章守宇
林军
GUO Yu;ZHANG Shouyu;LIN Jun(College of Marine Ecology and Environment,Shanghai Ocean University,Shanghai 201306,China)
出处
《南方水产科学》
CAS
CSCD
北大核心
2020年第5期71-79,共9页
South China Fisheries Science
基金
国家重点研发计划项目(2019YFD0901303)
公益性行业(农业)科研专项经费项目(201303047)。
关键词
人工鱼礁
建设模式
上升流效应
强度
中心位置
数值实验
Artificial reefs
Construction mode
Upwelling effects
Intensity
Central location
Numerical experiment
