Estimating the Effective Wake Region (Current Shadow) of Artificial Reefs

2011 ◽  
pp. 279-295 ◽  
Author(s):  
Tae Oh ◽  
Shinya Otake ◽  
Moon Lee
Keyword(s):  
Artificial Reefs ◽  
Wake Region ◽  
Effective Wake

scholarly journals Wake Region Estimates of Artificial Reefs in Vietnam: Effects of Tropical Seawater Temperatures and Seasonal Water Flow Variation

2020 ◽  
Vol 12 (15) ◽  
pp. 6191 ◽  
Author(s):  
Quynh Thi Ngoc Le ◽  
Somi Jung ◽  
Won-Bae Na
Keyword(s):  
Water Flow ◽  
Flow Direction ◽  
Seawater Temperature ◽  
Artificial Reef ◽  
Marine Species ◽  
Efficiency Index ◽  
Artificial Reefs ◽  
Effect Of Temperature ◽  
Wake Region ◽  
Flow Variation

From the perspective of saving energy of marine species and creating feeding areas, the wake volume of an artificial reef (AR) should be considered as a parameter in any wake region estimation. Wake regions of AR modules (reef ball, cylinder reef, and cube reef) and sets were numerically estimated considering tropical seawater temperatures and water flow variation in Vietnamese coastal waters. In addition, we considered an efficiency index (i.e., total wake volume per reef volume) and wake volume diagram (i.e., wake volume dependency on water flow direction) to characterize wake volumes. From the results, first, it was found that the effect of temperature on the wake volumes was minor in comparison with the effect of flow direction. It was also found that the optimum installation angles were 30° (reef ball and its set), 30° (cylinder reef and its set), and 0° (cube and its set) along the major flow direction. Second, it was found that the cylinder reef and its set were attractive because they generated the maximum wake volumes, regardless of seawater temperature. Thus, the module and set showed better average efficiency indices (9.28 for module and 6.81 for set) than the other cases. We found that the wake volume was dominant in the efficiency index and, accordingly, wake volume diagrams are sufficient to indicate the dependence on flow direction.

scholarly journals Wake Region Estimation of Artificial Reefs using Wake Volume Diagrams

2016 ◽  
Vol 28 (4) ◽  
pp. 1042-1056 ◽  
Author(s):  
Dongha KIM ◽  
Somi JUNG ◽  
Won-Bae NA
Keyword(s):  
Artificial Reefs ◽  
Wake Region
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