Ifremer, DYNECO/PHYSED, BP 70, 29280 Plouzané, France.
Mar Pollut Bull. 2012;65(10-12):425-40. doi: 10.1016/j.marpolbul.2012.05.041. Epub 2012 Jul 15.
Hydrodynamic functioning and water circulation of the semi-closed deep lagoon of Ahe atoll (Tuamotu Archipelago, French Polynesia) were investigated using 1 year of field data and a 3D hydrodynamical model. Tidal amplitude averaged less than 30 cm, but tide generated very strong currents (2 ms(-1)) in the pass, creating a jet-like circulation that partitioned the lagoon into three residual circulation cells. The pass entirely flushed excess water brought by waves-induced radiation stress. Circulation patterns were computed for climatological meteorological conditions and summarized with stream function and flushing time. Lagoon hydrodynamics and general overturning circulation was driven by wind. Renewal time was 250 days, whereas the e-flushing time yielded a lagoon-wide 80-days average. Tide-driven flush through the pass and wind-driven overturning circulation designate Ahe as a wind-driven, tidally and weakly wave-flushed deep lagoon. The 3D model allows studying pearl oyster larvae dispersal in both realistic and climatological conditions for aquaculture applications.
利用 1 年的现场数据和一个三维水动力模型，研究了图阿莫图群岛（法属波利尼西亚）阿赫环礁半封闭深泻湖的水动力功能和水循环。潮汐幅度平均小于 30 厘米，但在海峡中产生了很强的潮流（2 米/秒），形成了射流状的循环，将泻湖分成三个残余循环单元。海峡完全清除了由波浪辐射应力引起的多余水。根据气候气象条件计算了循环模式，并用水流函数和冲洗时间进行了总结。泻湖的水动力和总体翻转循环由风驱动。更新时间为 250 天，而 e 冲洗时间产生了 80 天的泻湖平均冲洗时间。通过海峡的潮汐驱动冲洗和由风驱动的翻转循环将阿赫指定为风驱动、潮汐驱动和弱波冲洗的深泻湖。该三维模型可用于研究珍珠牡蛎幼虫在水产养殖应用中的实际和气候条件下的扩散。
