Experimental and analytical investigations of wave-induced artificial upwelling

Artificial upwelling is supposed to be a general technique to enhance the marine primary productivity and fishery resources by means of pumping the nutrient-rich deep ocean water (DOW) to the euphotic layer. The wave energy is the most conspicuous form of ocean energy, the extraction of energy from the waves can be a viable economic solution to the power requirements of artificial upwelling. To extract the wave energy, a structure which responds to the input wave motion is required. This paper presents our latest investigation on the wave-induced artificial upwelling device by a fixed rigid pipe submerged in the water. In this study, we improve the theoretical methods, and the calculated results are verified by the wave-tank experiments. It turns out that the upwelling rate was affected of the wave height H, the wave period H, the water depth ft, the length of the pipe L and diameter of the pipe d, etc. Based on the theoretical calculations and experimental results, we can estimate the upwelling flow rate of the wave-induced artificial upwelling device applied in the open sea.