Efficiency Index Diagram for Wake Region Evaluation of Artificial Reefs Facilitated for Marine Forest Creation

Dongha Kim; Somi Jung; Won-Bae Na

doi:10.5574/jaroe.2016.2.4.169

Efficiency Index Diagram for Wake Region Evaluation of Artificial Reefs Facilitated for Marine Forest Creation

Journal of Advanced Research in Ocean Engineering ◽

10.5574/jaroe.2016.2.4.169 ◽

2016 ◽

Vol 2 (4) ◽

pp. 169-178

Author(s):

Dongha Kim ◽

Somi Jung ◽

Won-Bae Na

Keyword(s):

Efficiency Index ◽

Artificial Reefs ◽

Wake Region

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

Sustainability ◽

10.3390/su12156191 ◽

2020 ◽

Vol 12 (15) ◽

pp. 6191 ◽

Cited By ~ 3

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.

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

Artificial Reefs in Fisheries Management - Marine Biology ◽

10.1201/b10910-18 ◽

2011 ◽

pp. 279-295 ◽

Cited By ~ 2

Author(s):

Tae Oh ◽

Shinya Otake ◽

Moon Lee

Keyword(s):

Artificial Reefs ◽

Wake Region ◽

Effective Wake

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Placement Models of Marine Forest Artificial Reefs to Increase Wake Region Efficiency

Journal of Fisheries and Marine Sciences Education ◽

10.13000/jfmse.2018.02.30.1.132 ◽

2018 ◽

Vol 30 (1) ◽

pp. 132-143 ◽

Cited By ~ 6

Author(s):

Somi JUNG ◽

Won-Bae NA

Keyword(s):

Artificial Reefs ◽

Wake Region

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Wake Region Estimation of Artificial Reefs using Wake Volume Diagrams

Journal of Fisheries and Marine Sciences Education ◽

10.13000/jfmse.2016.28.4.1042 ◽

2016 ◽

Vol 28 (4) ◽

pp. 1042-1056 ◽

Cited By ~ 10

Author(s):

Dongha KIM ◽

Somi JUNG ◽

Won-Bae NA

Keyword(s):

Artificial Reefs ◽

Wake Region

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Evaluation of turbulence models for estimating the wake region of artificial reefs using particle image velocimetry and computational fluid dynamics

Ocean Engineering ◽

10.1016/j.oceaneng.2021.108673 ◽

2021 ◽

Vol 223 ◽

pp. 108673

Author(s):

Dongha Kim ◽

Somi Jung ◽

Won-Bae Na

Keyword(s):

Fluid Dynamics ◽

Computational Fluid Dynamics ◽

Particle Image Velocimetry ◽

Particle Image ◽

Turbulence Models ◽

Artificial Reefs ◽

Wake Region ◽

Image Velocimetry

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Spatial Distribution of Plankton around Artificial Reefs with Variation in the Tidal Current Direction

Korean Ecological Engineering Society ◽

10.33214/kees.2018.6.2.39 ◽

2018 ◽

Vol 6 (2) ◽

pp. 39-49

Author(s):

Gyung-Sun Lee ◽

Dong-Sun Kim ◽

Han-Sam Yoon ◽

Seok-Nam Kwak

Keyword(s):

Spatial Distribution ◽

Tidal Current ◽

Artificial Reefs ◽

Current Direction

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EFISIENSI PENGGUNAAN LAHAN DAN PUPUK DALAM USAHATANI PADI DI KOTA BAU-BAU PROPINSI SULAWESI TENGGARA

Sosiohumaniora ◽

10.24198/sosiohumaniora.v12i2.5447 ◽

2010 ◽

Vol 12 (2) ◽

pp. 153

Author(s):

Sulhan

Keyword(s):

Efficiency Index ◽

Marginal Value

Penelitian ini menggunakan metode survei dengan melibatkan 120 Rumah Tangga Petani (RTP) yang ditentukan secara acak sederhana dari 170 RTP. Data yang dikumpulkan adalah tingkat penggunaan lahan dan pupuk urea pada setiap RTP. Alat analisis yang digunakan adalah Fungsi Produksi Cobb-Douglas dengan tujuan untuk mendapatkan tingkat elastisitas penggunaan lahan dan pupuk urea (bi). Selanjutnya untuk mengetahui tingkat efisiensi penggunaan lahan dan pupuk urea digunakan alat analisis Efficiency Index (EI). EI adalah rasio antara Marginal Value Product (MVP) dan Marginal Factor Cost (MFC). Jika EI = 1, maka tingkat penggunaan lahan dan pupuk urea efisien; jika EI > 0, tingkat penggunan lahan dan pupuk urea belum efisien; dan jika EI < 0, tingkat penggunaan lahan dan pupuk urea tidak efisien. Hasil penelitian menunjukkan bahwa penggunaan lahan dan pupuk urea dalam usahatani padi di Bau-Bau memiliki EI > 1 yang berarti bahwa tingkat penggunaan kedua faktor produksi tersebut masih kurang karena dari setiap penambahan satu unit faktor produksi tersebut akan memberikan penerimaan yang lebih besar daripada besarnya biaya yang dikeluarkan. Oleh karenanya penggunaan kedua faktor produksi tersebut belum efisien sehingga disarankan untuk ditingkatkan penggunaannya.

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