FUNDAMENTAL STUDY ON DEPOSITS TRANSPORT CHARACTERISTICS IN A SQUARE AQUACULTURE SHALLOW TANK WITH FORCED RECIRCULATION FLOWS

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  • 大規模養殖水槽内の強制循環流に伴う堆積物掃流特性に関する基礎的研究

Abstract

<p> In large-scale tanks used for shrimp farming, establishment of a method for efficiently accumulating and removing waste deposits such as shells of shrimp is an important requirement for successful farming. In this study, we investigated the structure of the forced circulation flow generated by a pump and the advection characteristics of the sediment associated with the circulation flow in a flat square water tank simulating an aquaculture farm, using a hydraulic model experiment and numerical analysis. As a result, the secondary current of the first kind due to the circulation flow accumulates the sediment near the center of the tank, and this effect is enhanced by increasing the pump flow rate. Since the initial vortex immediately after starting the pump and the backlash of the water surface immediately after stopping pump contribute to the accumulation of sediment, repeated starting and stopping of the pump makes the sediment accumulation more efficient.</p>

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